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chengniansun opened this issue Dec 4, 2020 · 19 comments · Fixed by #80900 or #82061
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ICE: compiler/rustc_mir/src/interpret/validity.rs:918:17: Unexpected error during validation: unable to turn pointer into raw bytes #79690

chengniansun opened this issue Dec 4, 2020 · 19 comments · Fixed by #80900 or #82061
Labels
A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) C-bug Category: This is a bug. E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue. E-mentor Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion. glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ P-medium Medium priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@chengniansun
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chengniansun commented Dec 4, 2020 •
edited
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Code

union Transmute<T: Copy, U: Copy> {
    t: T,
    u: U,
}
trait Bar {
    fn bar(&self) -> u32;
}
struct Foo {
    foo: u32,
    bar: bool,
}
impl Bar for Foo {
    fn bar(&self) -> u32 {
        self.foo
    }
}
#[derive(Copy, Clone)]
struct Fat<'a>(&'a Foo, &'static VTable);
struct VTable {
    size: Foo,
}
const FOO: &Bar = &Foo {
    foo: 128,
    bar: false,
};
const G: Fat = unsafe { Transmute { t: FOO }.u };

Meta

rustc --version --verbose:

rustc 1.50.0-nightly (5be3f9f10 2020-12-03)
binary: rustc
commit-hash: 5be3f9f10e9fd59ea03816840a6051413fbdefae
commit-date: 2020-12-03
host: x86_64-unknown-linux-gnu
release: 1.50.0-nightly

Error output

warning: trait objects without an explicit `dyn` are deprecated
  --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:22:13
   |
22 | const FOO: &Bar = &Foo {
   |             ^^^ help: use `dyn`: `dyn Bar`
   |
   = note: `#[warn(bare_trait_objects)]` on by default

warning: union is never used: `Transmute`
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:7
  |
1 | union Transmute<T: Copy, U: Copy> {
  |       ^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: field is never read: `bar`
  --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:10:5
   |
10 |     bar: bool,
   |     ^^^^^^^^^

warning: field is never read: `size`
  --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:20:5
   |
20 |     size: Foo,
   |     ^^^^^^^^^

warning: constant is never used: `FOO`
  --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:22:1
   |
22 | / const FOO: &Bar = &Foo {
23 | |     foo: 128,
24 | |     bar: false,
25 | | };
   | |__^

warning: constant is never used: `G`
  --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:26:1
   |
26 | const G: Fat = unsafe { Transmute { t: FOO }.u };
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: internal compiler error: compiler/rustc_mir/src/interpret/validity.rs:918:17: Unexpected error during validation: unable to turn pointer into raw bytes

thread 'rustc' panicked at 'Box<Any>', compiler/rustc_errors/src/lib.rs:958:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.50.0-nightly (5be3f9f10 2020-12-03) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type staticlib

query stack during panic:
#0 [eval_to_allocation_raw] const-evaluating + checking `G`
#1 [eval_to_const_value_raw] simplifying constant for the type system `G`
end of query stack
error: aborting due to previous error; 6 warnings emitted
Backtrace 

warning: trait objects without an explicit `dyn` are deprecated
  --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:22:13
   |
22 | const FOO: &Bar = &Foo {
   |             ^^^ help: use `dyn`: `dyn Bar`
   |
   = note: `#[warn(bare_trait_objects)]` on by default

warning: union is never used: `Transmute`
 --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:1:7
  |
1 | union Transmute<T: Copy, U: Copy> {
  |       ^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: field is never read: `bar`
  --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:10:5
   |
10 |     bar: bool,
   |     ^^^^^^^^^

warning: field is never read: `size`
  --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:20:5
   |
20 |     size: Foo,
   |     ^^^^^^^^^

warning: constant is never used: `FOO`
  --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:22:1
   |
22 | / const FOO: &Bar = &Foo {
23 | |     foo: 128,
24 | |     bar: false,
25 | | };
   | |__^

warning: constant is never used: `G`
  --> perses_node_priority_with_dfs_delta_reduced_mutant.rs:26:1
   |
26 | const G: Fat = unsafe { Transmute { t: FOO }.u };
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: internal compiler error: compiler/rustc_mir/src/interpret/validity.rs:918:17: Unexpected error during validation: unable to turn pointer into raw bytes

thread 'rustc' panicked at 'Box<Any>', compiler/rustc_errors/src/lib.rs:958:9
stack backtrace:
   0: std::panicking::begin_panic
   1: rustc_errors::HandlerInner::bug
   2: rustc_errors::Handler::bug
   3: rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}
   4: rustc_middle::ty::context::tls::with_opt::{{closure}}
   5: rustc_middle::ty::context::tls::with_opt
   6: rustc_middle::util::bug::opt_span_bug_fmt
   7: rustc_middle::util::bug::bug_fmt
   8: rustc_mir::interpret::validity::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::validate_operand_internal
   9: rustc_mir::const_eval::eval_queries::eval_to_allocation_raw_provider
  10: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_allocation_raw>::compute
  11: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}
  12: rustc_query_system::query::plumbing::get_query_impl
  13: rustc_mir::const_eval::eval_queries::eval_to_const_value_raw_provider
  14: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_const_value_raw>::compute
  15: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}
  16: rustc_query_system::query::plumbing::get_query_impl
  17: rustc_mir::const_eval::eval_queries::eval_to_const_value_raw_provider
  18: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_const_value_raw>::compute
  19: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
  20: rustc_data_structures::stack::ensure_sufficient_stack
  21: rustc_query_system::query::plumbing::get_query_impl
  22: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_poly
  23: <rustc_lint::BuiltinCombinedLateLintPass as rustc_lint::passes::LateLintPass>::check_item
  24: rustc_hir::intravisit::Visitor::visit_nested_item
  25: rustc_hir::intravisit::walk_crate
  26: rustc_session::utils::<impl rustc_session::session::Session>::time
  27: rustc_interface::passes::analysis::{{closure}}::{{closure}}
  28: rustc_session::utils::<impl rustc_session::session::Session>::time
  29: rustc_interface::passes::analysis
  30: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
  31: rustc_query_system::dep_graph::graph::DepGraph<K>::with_eval_always_task
  32: rustc_data_structures::stack::ensure_sufficient_stack
  33: rustc_query_system::query::plumbing::get_query_impl
  34: rustc_interface::passes::QueryContext::enter
  35: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
  36: rustc_span::with_source_map
  37: scoped_tls::ScopedKey<T>::set
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.50.0-nightly (3ff10e74a 2020-12-04) running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type staticlib

query stack during panic:
#0 [eval_to_allocation_raw] const-evaluating + checking `G`
#1 [eval_to_const_value_raw] simplifying constant for the type system `G`
#2 [eval_to_const_value_raw] simplifying constant for the type system `G`
#3 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to previous error; 6 warnings emitted

@chengniansun chengniansun added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Dec 4, 2020
@camelid camelid added the A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) label Dec 4, 2020
@camelid
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camelid commented Dec 4, 2020 •
edited
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@rustbot glacier "https://gist.github.com/rust-play/1d2b9d36a074c3f6a88d817266516fd2"

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rustbot added a commit to rustbot/glacier that referenced this issue Dec 4, 2020
@rustbot
Add ICE reproduction for issue rust-lang/rust#79690.
f2efd72
@rustbot rustbot mentioned this issue Dec 4, 2020
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@matthiaskrgr
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Compiler error on 1.45 but ICE on 1.46
@rustbot label +regression-from-stable-to-stable

@rustbot rustbot added regression-from-stable-to-stable Performance or correctness regression from one stable version to another. I-prioritize Issue: Indicates that prioritization has been requested for this issue. labels Dec 4, 2020
@oli-obk
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oli-obk commented Dec 4, 2020

cc @rust-lang/wg-const-eval

@rust-lang-glacier-bot rust-lang-glacier-bot added the glacier ICE tracked in rust-lang/glacier. label Dec 4, 2020
@DutchGhost
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A previous (now-fixed) ICE with the same error message is #72113

@RalfJung
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RalfJung commented Dec 5, 2020

Thanks for the report!

Would be good to get a better backtrace; this one seems to be missing many frames and there are no line numbers.

@chengniansun
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@RalfJung ,

I updated the backtrace in my first post.

I used rustup to get the latest trunk version, and the one I have been using does not have line numbers.

If there is a flag or configuration for rustup to get rustc binaries with line numbers, I would be happy to change the settings on my testing machine.

@RalfJung
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RalfJung commented Dec 5, 2020

I think getting line numbers requires a debug build of the compiler, so it's not quite as easy as installing something via rustup.

@hameerabbasi
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Labeling P-medium as discussed.

@hameerabbasi hameerabbasi added P-medium Medium priority and removed I-prioritize Issue: Indicates that prioritization has been requested for this issue. labels Dec 6, 2020
@RalfJung
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RalfJung commented Dec 6, 2020

Here's a backtrace with debug info:

error: internal compiler error: compiler/rustc_mir/src/interpret/validity.rs:918:17: Unexpected error during validation: unable to turn pointer into raw bytes

thread 'rustc' panicked at 'Box<Any>', compiler/rustc_errors/src/lib.rs:958:9
stack backtrace:
   0: std::panicking::begin_panic
             at ./library/std/src/panicking.rs:519:12
   1: rustc_errors::HandlerInner::bug
             at ./compiler/rustc_errors/src/lib.rs:958:9
   2: rustc_errors::Handler::bug
             at ./compiler/rustc_errors/src/lib.rs:675:9
   3: rustc_middle::util::bug::opt_span_bug_fmt::{{closure}}
             at ./compiler/rustc_middle/src/util/bug.rs:33:34
   4: rustc_middle::ty::context::tls::with_opt::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1785:40
   5: rustc_middle::ty::context::tls::with_context_opt
             at ./compiler/rustc_middle/src/ty/context.rs:1737:22
   6: rustc_middle::ty::context::tls::with_opt
             at ./compiler/rustc_middle/src/ty/context.rs:1785:9
   7: rustc_middle::util::bug::opt_span_bug_fmt
             at ./compiler/rustc_middle/src/util/bug.rs:29:5
   8: rustc_middle::util::bug::bug_fmt
             at ./compiler/rustc_middle/src/util/bug.rs:14:5
   9: rustc_mir::interpret::validity::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::validate_operand_internal
             at ./compiler/rustc_mir/src/interpret/validity.rs:918:17
  10: rustc_mir::interpret::validity::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::const_validate_operand
             at ./compiler/rustc_mir/src/interpret/validity.rs:941:9
  11: rustc_mir::const_eval::eval_queries::eval_to_allocation_raw_provider
             at ./compiler/rustc_mir/src/const_eval/eval_queries.rs:398:25
  12: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_allocation_raw>::compute
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:377:17
  13: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./compiler/rustc_query_system/src/dep_graph/graph.rs:302:14
  14: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
             at ./compiler/rustc_query_system/src/dep_graph/graph.rs:201:9
  15: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:608:17
  16: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:73:74
  17: stacker::maybe_grow
             at /home/r/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/stacker-0.1.12/src/lib.rs:55:9
  18: rustc_data_structures::stack::ensure_sufficient_stack
             at ./compiler/rustc_data_structures/src/stack.rs:16:5
  19: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:73:17
  20: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1720:50
  21: rustc_middle::ty::context::tls::set_tlv
             at ./compiler/rustc_middle/src/ty/context.rs:1704:9
  22: rustc_middle::ty::context::tls::enter_context
             at ./compiler/rustc_middle/src/ty/context.rs:1720:9
  23: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:72:13
  24: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1764:13
  25: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1748:40
  26: rustc_middle::ty::context::tls::with_context_opt
             at ./compiler/rustc_middle/src/ty/context.rs:1737:22
  27: rustc_middle::ty::context::tls::with_context
             at ./compiler/rustc_middle/src/ty/context.rs:1748:9
  28: rustc_middle::ty::context::tls::with_related_context
             at ./compiler/rustc_middle/src/ty/context.rs:1761:9
  29: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:61:9
  30: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:598:9
  31: rustc_query_system::query::plumbing::with_diagnostics
             at ./compiler/rustc_query_system/src/query/plumbing.rs:302:18
  32: rustc_query_system::query::plumbing::force_query_with_job
             at ./compiler/rustc_query_system/src/query/plumbing.rs:597:51
  33: rustc_query_system::query::plumbing::try_execute_query
             at ./compiler/rustc_query_system/src/query/plumbing.rs:426:16
  34: rustc_query_system::query::plumbing::get_query_impl::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:645:23
  35: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at ./compiler/rustc_query_system/src/query/caches.rs:114:79
  36: rustc_query_system::query::plumbing::try_get_cached
             at ./compiler/rustc_query_system/src/query/plumbing.rs:379:5
  37: rustc_query_system::query::plumbing::get_query_impl
             at ./compiler/rustc_query_system/src/query/plumbing.rs:637:5
  38: rustc_query_system::query::plumbing::get_query
             at ./compiler/rustc_query_system/src/query/plumbing.rs:739:5
  39: rustc_middle::ty::query::TyCtxtAt::eval_to_allocation_raw
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:487:17
  40: rustc_middle::ty::query::<impl rustc_middle::ty::context::TyCtxt>::eval_to_allocation_raw
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:448:17
  41: rustc_mir::const_eval::eval_queries::eval_to_const_value_raw_provider
             at ./compiler/rustc_mir/src/const_eval/eval_queries.rs:234:5
  42: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_const_value_raw>::compute
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:377:17
  43: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./compiler/rustc_query_system/src/dep_graph/graph.rs:302:14
  44: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
             at ./compiler/rustc_query_system/src/dep_graph/graph.rs:201:9
  45: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:608:17
  46: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:73:74
  47: stacker::maybe_grow
             at /home/r/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/stacker-0.1.12/src/lib.rs:55:9
  48: rustc_data_structures::stack::ensure_sufficient_stack
             at ./compiler/rustc_data_structures/src/stack.rs:16:5
  49: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:73:17
  50: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1720:50
  51: rustc_middle::ty::context::tls::set_tlv
             at ./compiler/rustc_middle/src/ty/context.rs:1704:9
  52: rustc_middle::ty::context::tls::enter_context
             at ./compiler/rustc_middle/src/ty/context.rs:1720:9
  53: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:72:13
  54: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1764:13
  55: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1748:40
  56: rustc_middle::ty::context::tls::with_context_opt
             at ./compiler/rustc_middle/src/ty/context.rs:1737:22
  57: rustc_middle::ty::context::tls::with_context
             at ./compiler/rustc_middle/src/ty/context.rs:1748:9
  58: rustc_middle::ty::context::tls::with_related_context
             at ./compiler/rustc_middle/src/ty/context.rs:1761:9
  59: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:61:9
  60: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:598:9
  61: rustc_query_system::query::plumbing::with_diagnostics
             at ./compiler/rustc_query_system/src/query/plumbing.rs:302:18
  62: rustc_query_system::query::plumbing::force_query_with_job
             at ./compiler/rustc_query_system/src/query/plumbing.rs:597:51
  63: rustc_query_system::query::plumbing::try_execute_query
             at ./compiler/rustc_query_system/src/query/plumbing.rs:426:16
  64: rustc_query_system::query::plumbing::get_query_impl::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:645:23
  65: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at ./compiler/rustc_query_system/src/query/caches.rs:114:79
  66: rustc_query_system::query::plumbing::try_get_cached
             at ./compiler/rustc_query_system/src/query/plumbing.rs:379:5
  67: rustc_query_system::query::plumbing::get_query_impl
             at ./compiler/rustc_query_system/src/query/plumbing.rs:637:5
  68: rustc_query_system::query::plumbing::get_query
             at ./compiler/rustc_query_system/src/query/plumbing.rs:739:5
  69: rustc_middle::ty::query::TyCtxtAt::eval_to_const_value_raw
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:487:17
  70: rustc_middle::ty::query::<impl rustc_middle::ty::context::TyCtxt>::eval_to_const_value_raw
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:448:17
  71: rustc_mir::const_eval::eval_queries::eval_to_const_value_raw_provider
             at ./compiler/rustc_mir/src/const_eval/eval_queries.rs:211:15
  72: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_const_value_raw>::compute
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:377:17
  73: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./compiler/rustc_query_system/src/dep_graph/graph.rs:302:14
  74: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task
             at ./compiler/rustc_query_system/src/dep_graph/graph.rs:201:9
  75: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:608:17
  76: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:73:74
  77: stacker::maybe_grow
             at /home/r/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/stacker-0.1.12/src/lib.rs:55:9
  78: rustc_data_structures::stack::ensure_sufficient_stack
             at ./compiler/rustc_data_structures/src/stack.rs:16:5
  79: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:73:17
  80: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1720:50
  81: rustc_middle::ty::context::tls::set_tlv
             at ./compiler/rustc_middle/src/ty/context.rs:1704:9
  82: rustc_middle::ty::context::tls::enter_context
             at ./compiler/rustc_middle/src/ty/context.rs:1720:9
  83: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:72:13
  84: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1764:13
  85: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1748:40
  86: rustc_middle::ty::context::tls::with_context_opt
             at ./compiler/rustc_middle/src/ty/context.rs:1737:22
  87: rustc_middle::ty::context::tls::with_context
             at ./compiler/rustc_middle/src/ty/context.rs:1748:9
  88: rustc_middle::ty::context::tls::with_related_context
             at ./compiler/rustc_middle/src/ty/context.rs:1761:9
  89: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:61:9
  90: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:598:9
  91: rustc_query_system::query::plumbing::with_diagnostics
             at ./compiler/rustc_query_system/src/query/plumbing.rs:302:18
  92: rustc_query_system::query::plumbing::force_query_with_job
             at ./compiler/rustc_query_system/src/query/plumbing.rs:597:51
  93: rustc_query_system::query::plumbing::try_execute_query
             at ./compiler/rustc_query_system/src/query/plumbing.rs:426:16
  94: rustc_query_system::query::plumbing::get_query_impl::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:645:23
  95: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at ./compiler/rustc_query_system/src/query/caches.rs:114:79
  96: rustc_query_system::query::plumbing::try_get_cached
             at ./compiler/rustc_query_system/src/query/plumbing.rs:379:5
  97: rustc_query_system::query::plumbing::get_query_impl
             at ./compiler/rustc_query_system/src/query/plumbing.rs:637:5
  98: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_global_id
  99: rustc_middle::mir::interpret::queries::<impl rustc_middle::ty::context::TyCtxt>::const_eval_poly
             at ./compiler/rustc_middle/src/mir/interpret/queries.rs:22:9
 100: <rustc_lint::builtin::UnusedBrokenConst as rustc_lint::passes::LateLintPass>::check_item
             at ./compiler/rustc_lint/src/builtin.rs:1496:25
 101: <rustc_lint::BuiltinCombinedLateLintPass as rustc_lint::passes::LateLintPass>::check_item
             at ./compiler/rustc_lint/src/passes.rs:115:13
 102: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_item::{{closure}}::{{closure}}
             at ./compiler/rustc_lint/src/late.rs:145:17
 103: rustc_lint::late::LateContextAndPass<T>::with_param_env
             at ./compiler/rustc_lint/src/late.rs:75:9
 104: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_item::{{closure}}
             at ./compiler/rustc_lint/src/late.rs:144:13
 105: rustc_lint::late::LateContextAndPass<T>::with_lint_attrs
             at ./compiler/rustc_lint/src/late.rs:63:9
 106: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_item
             at ./compiler/rustc_lint/src/late.rs:143:9
 107: rustc_hir::intravisit::Visitor::visit_nested_item
             at ./compiler/rustc_hir/src/intravisit.rs:273:9
 108: rustc_hir::intravisit::walk_mod
             at ./compiler/rustc_hir/src/intravisit.rs:500:9
 109: rustc_lint::late::LateContextAndPass<T>::process_mod
             at ./compiler/rustc_lint/src/late.rs:81:9
 110: <rustc_lint::late::LateContextAndPass<T> as rustc_hir::intravisit::Visitor>::visit_mod
             at ./compiler/rustc_lint/src/late.rs:251:13
 111: rustc_hir::intravisit::walk_crate
             at ./compiler/rustc_hir/src/intravisit.rs:486:5
 112: rustc_lint::late::late_lint_pass_crate::{{closure}}
             at ./compiler/rustc_lint/src/late.rs:444:9
 113: rustc_lint::late::LateContextAndPass<T>::with_lint_attrs
             at ./compiler/rustc_lint/src/late.rs:63:9
 114: rustc_lint::late::late_lint_pass_crate
             at ./compiler/rustc_lint/src/late.rs:439:5
 115: rustc_lint::late::late_lint_crate
             at ./compiler/rustc_lint/src/late.rs:458:9
 116: rustc_lint::late::check_crate::{{closure}}::{{closure}}
             at ./compiler/rustc_lint/src/late.rs:488:17
 117: rustc_data_structures::profiling::VerboseTimingGuard::run
             at ./compiler/rustc_data_structures/src/profiling.rs:570:9
 118: rustc_session::utils::<impl rustc_session::session::Session>::time
             at ./compiler/rustc_session/src/utils.rs:9:9
 119: rustc_lint::late::check_crate::{{closure}}
             at ./compiler/rustc_lint/src/late.rs:486:13
 120: rustc_data_structures::sync::join
             at ./compiler/rustc_data_structures/src/sync.rs:159:14
 121: rustc_lint::late::check_crate
             at ./compiler/rustc_lint/src/late.rs:484:5
 122: rustc_interface::passes::analysis::{{closure}}::{{closure}}::{{closure}}::{{closure}}
             at ./compiler/rustc_interface/src/passes.rs:901:29
 123: rustc_data_structures::profiling::VerboseTimingGuard::run
             at ./compiler/rustc_data_structures/src/profiling.rs:570:9
 124: rustc_session::utils::<impl rustc_session::session::Session>::time
             at ./compiler/rustc_session/src/utils.rs:9:9
 125: rustc_interface::passes::analysis::{{closure}}::{{closure}}::{{closure}}
             at ./compiler/rustc_interface/src/passes.rs:900:25
 126: core::ops::function::FnOnce::call_once
             at ./library/core/src/ops/function.rs:227:5
 127: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at ./library/std/src/panic.rs:322:9
 128: std::panicking::try::do_call
             at ./library/std/src/panicking.rs:379:40
 129: std::panicking::try
             at ./library/std/src/panicking.rs:343:19
 130: std::panic::catch_unwind
             at ./library/std/src/panic.rs:396:14
 131: rustc_interface::passes::analysis::{{closure}}::{{closure}}
             at ./compiler/rustc_interface/src/passes.rs:887:17
 132: core::ops::function::FnOnce::call_once
             at ./library/core/src/ops/function.rs:227:5
 133: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at ./library/std/src/panic.rs:322:9
 134: std::panicking::try::do_call
             at ./library/std/src/panicking.rs:379:40
 135: std::panicking::try
             at ./library/std/src/panicking.rs:343:19
 136: std::panic::catch_unwind
             at ./library/std/src/panic.rs:396:14
 137: rustc_interface::passes::analysis::{{closure}}
             at ./compiler/rustc_interface/src/passes.rs:883:9
 138: rustc_data_structures::profiling::VerboseTimingGuard::run
             at ./compiler/rustc_data_structures/src/profiling.rs:570:9
 139: rustc_session::utils::<impl rustc_session::session::Session>::time
             at ./compiler/rustc_session/src/utils.rs:9:9
 140: rustc_interface::passes::analysis
             at ./compiler/rustc_interface/src/passes.rs:882:5
 141: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::analysis>::compute
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:377:17
 142: rustc_query_system::dep_graph::graph::DepGraph<K>::with_task_impl
             at ./compiler/rustc_query_system/src/dep_graph/graph.rs:302:14
 143: rustc_query_system::dep_graph::graph::DepGraph<K>::with_eval_always_task
             at ./compiler/rustc_query_system/src/dep_graph/graph.rs:335:9
 144: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:600:17
 145: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:73:74
 146: stacker::maybe_grow
             at /home/r/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/stacker-0.1.12/src/lib.rs:55:9
 147: rustc_data_structures::stack::ensure_sufficient_stack
             at ./compiler/rustc_data_structures/src/stack.rs:16:5
 148: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:73:17
 149: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1720:50
 150: rustc_middle::ty::context::tls::set_tlv
             at ./compiler/rustc_middle/src/ty/context.rs:1704:9
 151: rustc_middle::ty::context::tls::enter_context
             at ./compiler/rustc_middle/src/ty/context.rs:1720:9
 152: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query::{{closure}}
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:72:13
 153: rustc_middle::ty::context::tls::with_related_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1764:13
 154: rustc_middle::ty::context::tls::with_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1748:40
 155: rustc_middle::ty::context::tls::with_context_opt
             at ./compiler/rustc_middle/src/ty/context.rs:1737:22
 156: rustc_middle::ty::context::tls::with_context
             at ./compiler/rustc_middle/src/ty/context.rs:1748:9
 157: rustc_middle::ty::context::tls::with_related_context
             at ./compiler/rustc_middle/src/ty/context.rs:1761:9
 158: rustc_middle::ty::query::plumbing::<impl rustc_query_system::query::QueryContext for rustc_middle::ty::context::TyCtxt>::start_query
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:61:9
 159: rustc_query_system::query::plumbing::force_query_with_job::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:598:9
 160: rustc_query_system::query::plumbing::with_diagnostics
             at ./compiler/rustc_query_system/src/query/plumbing.rs:302:18
 161: rustc_query_system::query::plumbing::force_query_with_job
             at ./compiler/rustc_query_system/src/query/plumbing.rs:597:51
 162: rustc_query_system::query::plumbing::try_execute_query
             at ./compiler/rustc_query_system/src/query/plumbing.rs:426:16
 163: rustc_query_system::query::plumbing::get_query_impl::{{closure}}
             at ./compiler/rustc_query_system/src/query/plumbing.rs:645:23
 164: <rustc_query_system::query::caches::DefaultCache<K,V> as rustc_query_system::query::caches::QueryCache>::lookup
             at ./compiler/rustc_query_system/src/query/caches.rs:114:79
 165: rustc_query_system::query::plumbing::try_get_cached
             at ./compiler/rustc_query_system/src/query/plumbing.rs:379:5
 166: rustc_query_system::query::plumbing::get_query_impl
             at ./compiler/rustc_query_system/src/query/plumbing.rs:637:5
 167: rustc_query_system::query::plumbing::get_query
             at ./compiler/rustc_query_system/src/query/plumbing.rs:739:5
 168: rustc_middle::ty::query::TyCtxtAt::analysis
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:487:17
 169: rustc_middle::ty::query::<impl rustc_middle::ty::context::TyCtxt>::analysis
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:448:17
 170: rustc_driver::run_compiler::{{closure}}::{{closure}}::{{closure}}
             at ./compiler/rustc_driver/src/lib.rs:440:59
 171: rustc_interface::passes::QueryContext::enter::{{closure}}
             at ./compiler/rustc_interface/src/passes.rs:725:42
 172: rustc_middle::ty::context::tls::enter_context::{{closure}}
             at ./compiler/rustc_middle/src/ty/context.rs:1720:50
 173: rustc_middle::ty::context::tls::set_tlv
             at ./compiler/rustc_middle/src/ty/context.rs:1704:9
 174: rustc_middle::ty::context::tls::enter_context
             at ./compiler/rustc_middle/src/ty/context.rs:1720:9
 175: rustc_interface::passes::QueryContext::enter
             at ./compiler/rustc_interface/src/passes.rs:725:9
 176: rustc_driver::run_compiler::{{closure}}::{{closure}}
             at ./compiler/rustc_driver/src/lib.rs:440:13
 177: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::enter
             at ./compiler/rustc_interface/src/queries.rs:413:19
 178: rustc_driver::run_compiler::{{closure}}
             at ./compiler/rustc_driver/src/lib.rs:341:22
 179: rustc_interface::interface::create_compiler_and_run::{{closure}}
             at ./compiler/rustc_interface/src/interface.rs:196:13
 180: rustc_span::with_source_map
             at ./compiler/rustc_span/src/lib.rs:765:5
 181: rustc_interface::interface::create_compiler_and_run
             at ./compiler/rustc_interface/src/interface.rs:190:5
 182: rustc_interface::interface::run_compiler::{{closure}}
             at ./compiler/rustc_interface/src/interface.rs:212:12
 183: rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals::{{closure}}::{{closure}}
             at ./compiler/rustc_interface/src/util.rs:152:13
 184: scoped_tls::ScopedKey<T>::set
             at /home/r/.cargo/registry/src/github.heygears.com-1ecc6299db9ec823/scoped-tls-1.0.0/src/lib.rs:137:9
 185: rustc_span::with_session_globals
             at ./compiler/rustc_span/src/lib.rs:94:5
 186: rustc_interface::util::setup_callbacks_and_run_in_thread_pool_with_globals::{{closure}}
             at ./compiler/rustc_interface/src/util.rs:150:9
 187: rustc_interface::util::scoped_thread::{{closure}}
             at ./compiler/rustc_interface/src/util.rs:125:24
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.50.0-dev running on x86_64-unknown-linux-gnu

note: compiler flags: --crate-type lib

query stack during panic:
#0 [eval_to_allocation_raw] const-evaluating + checking `G`
#1 [eval_to_const_value_raw] simplifying constant for the type system `G`
#2 [eval_to_const_value_raw] simplifying constant for the type system `G`
#3 [analysis] running analysis passes on this crate
end of query stack
error: aborting due to previous error; 6 warnings emitted

@RalfJung
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RalfJung commented Dec 6, 2020

Unfortunately, this bottoms out here; more digging will be needed to determine the true underlying cause of the error.

@RalfJung
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RalfJung commented Dec 7, 2020 •
edited
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Here is the actual backtrace of the underlying CTFE/Miri error:

An error occurred in miri:
   0: <rustc_middle::mir::interpret::error::InterpErrorInfo as core::convert::From<rustc_middle::mir::interpret::error::InterpError>>::from
             at ./compiler/rustc_middle/src/mir/interpret/error.rs:102:53
   1: rustc_middle::mir::interpret::allocation::Allocation<Tag,Extra>::check_relocations
             at ./compiler/rustc_middle/src/mir/interpret/allocation.rs:477:13
      rustc_middle::mir::interpret::allocation::Allocation<Tag,Extra>::check_relocation_edges
             at ./compiler/rustc_middle/src/mir/interpret/allocation.rs:534:9
      rustc_middle::mir::interpret::allocation::Allocation<Tag,Extra>::get_bytes_internal
             at ./compiler/rustc_middle/src/mir/interpret/allocation.rs:216:13
      rustc_middle::mir::interpret::allocation::Allocation<Tag,Extra>::get_bytes_with_uninit_and_ptr
             at ./compiler/rustc_middle/src/mir/interpret/allocation.rs:251:9
   2: rustc_middle::mir::interpret::allocation::Allocation<Tag,Extra>::read_scalar
             at ./compiler/rustc_middle/src/mir/interpret/allocation.rs:360:21
   3: rustc_mir::interpret::operand::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::try_read_immediate_from_mplace
             at ./compiler/rustc_mir/src/interpret/operand.rs:269:30
      rustc_mir::interpret::operand::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::try_read_immediate
             at ./compiler/rustc_mir/src/interpret/operand.rs:302:36
   4: rustc_mir::interpret::operand::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::read_immediate
             at ./compiler/rustc_mir/src/interpret/operand.rs:318:26
      rustc_mir::interpret::operand::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::read_scalar
             at ./compiler/rustc_mir/src/interpret/operand.rs:330:12
   5: rustc_mir::interpret::validity::ValidityVisitor<M>::try_visit_primitive
             at ./compiler/rustc_mir/src/interpret/validity.rs:514:29
   6: <rustc_mir::interpret::validity::ValidityVisitor<M> as rustc_mir::interpret::visitor::ValueVisitor<M>>::visit_value
             at ./compiler/rustc_mir/src/interpret/validity.rs:739:12
   7: <rustc_mir::interpret::validity::ValidityVisitor<M> as rustc_mir::interpret::visitor::ValueVisitor<M>>::visit_field::{{closure}}
             at ./compiler/rustc_mir/src/interpret/validity.rs:706:42
      rustc_mir::interpret::validity::ValidityVisitor<M>::with_elem
             at ./compiler/rustc_mir/src/interpret/validity.rs:304:17
      <rustc_mir::interpret::validity::ValidityVisitor<M> as rustc_mir::interpret::visitor::ValueVisitor<M>>::visit_field
             at ./compiler/rustc_mir/src/interpret/validity.rs:706:9
   8: rustc_mir::interpret::visitor::ValueVisitor::walk_aggregate
             at ./compiler/rustc_mir/src/interpret/visitor.rs:197:21
      <rustc_mir::interpret::validity::ValidityVisitor<M> as rustc_mir::interpret::visitor::ValueVisitor<M>>::visit_aggregate
             at ./compiler/rustc_mir/src/interpret/validity.rs:884:17
      rustc_mir::interpret::visitor::ValueVisitor::walk_value
             at ./compiler/rustc_mir/src/interpret/visitor.rs:236:25
   9: <rustc_mir::interpret::validity::ValidityVisitor<M> as rustc_mir::interpret::visitor::ValueVisitor<M>>::visit_value
             at ./compiler/rustc_mir/src/interpret/validity.rs:755:9
  10: <rustc_mir::interpret::validity::ValidityVisitor<M> as rustc_mir::interpret::visitor::ValueVisitor<M>>::visit_field::{{closure}}
             at ./compiler/rustc_mir/src/interpret/validity.rs:706:42
      rustc_mir::interpret::validity::ValidityVisitor<M>::with_elem
             at ./compiler/rustc_mir/src/interpret/validity.rs:304:17
      <rustc_mir::interpret::validity::ValidityVisitor<M> as rustc_mir::interpret::visitor::ValueVisitor<M>>::visit_field
             at ./compiler/rustc_mir/src/interpret/validity.rs:706:9
  11: rustc_mir::interpret::visitor::ValueVisitor::walk_aggregate
             at ./compiler/rustc_mir/src/interpret/visitor.rs:197:21
      <rustc_mir::interpret::validity::ValidityVisitor<M> as rustc_mir::interpret::visitor::ValueVisitor<M>>::visit_aggregate
             at ./compiler/rustc_mir/src/interpret/validity.rs:884:17
      rustc_mir::interpret::visitor::ValueVisitor::walk_value
             at ./compiler/rustc_mir/src/interpret/visitor.rs:236:25
  12: <rustc_mir::interpret::validity::ValidityVisitor<M> as rustc_mir::interpret::visitor::ValueVisitor<M>>::visit_value
             at ./compiler/rustc_mir/src/interpret/validity.rs:755:9
      rustc_mir::interpret::validity::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::validate_operand_internal
             at ./compiler/rustc_mir/src/interpret/validity.rs:908:15
  13: rustc_mir::interpret::validity::<impl rustc_mir::interpret::eval_context::InterpCx<M>>::const_validate_operand
             at ./compiler/rustc_mir/src/interpret/validity.rs:941:9
      rustc_mir::const_eval::eval_queries::eval_to_allocation_raw_provider
             at ./compiler/rustc_mir/src/const_eval/eval_queries.rs:398:25
  14: rustc_middle::ty::query::<impl rustc_query_system::query::config::QueryAccessors<rustc_middle::ty::context::TyCtxt> for rustc_middle::ty::query::queries::eval_to_allocation_raw>::compute
             at ./compiler/rustc_middle/src/ty/query/plumbing.rs:377:17

It points to this line:

rust/compiler/rustc_mir/src/interpret/validity.rs

Line 514 in e5721a5

let value = self.ecx.read_scalar(value)?;

read_scalar can handle pointer values just fine, so I think what is happening is that we are reading parts of a pointer value here, which indeed is not supported in CTFE.

@oli-obk
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oli-obk commented Dec 7, 2020

So... I guess the fix is to make this kind of error also be permitted during validation and turn it into a proper validation error?

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RalfJung commented Dec 7, 2020 •
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Permitting it at the top-level is no good, since then we don't know "where in the value" it arose.

We need a version of read_scalar that catches this error and turns it into a validation error with the current "path".

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oli-obk commented Dec 7, 2020

Oh... right, we should fix this in general, and not just wrap

rust/compiler/rustc_mir/src/interpret/validity.rs

Line 514 in 49720d2

let value = self.ecx.read_scalar(value)?;
in try_validation. Maybe we should not have any automatic way to bubble up errors and require all sites to use try_validation?

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RalfJung commented Dec 7, 2020

and not just wrap

I think we should wrap it but put the wrapped thing into a helper function sow e can also use it for the other places.

Maybe we should not have any automatic way to bubble up errors and require all sites to use try_validation?

So basically, you want to use a different error type for validation, one that excludes all the other errors? I am open to refactorings here.

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oli-obk commented Dec 7, 2020 •
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Let's start out with wrapping, and then I can experiment with the refactoring so we can have a look at the usability effect of it

Instructions:

wrap the read_scalar call at

rust/compiler/rustc_mir/src/interpret/validity.rs

Line 514 in 49720d2

let value = self.ecx.read_scalar(value)?;
in a try_validation macro invocation and capture the ReadPointerAsBytes error. Emit a validation message about the fact that reading parts of a pointer is not possible during CTFE. Don't forget to add a test (the failing example from this issue works great as a test) and run the test with ./x.py test src/test/ui --test-args your_test_name --bless

@oli-obk oli-obk added the E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue. label Dec 7, 2020
@camelid camelid self-assigned this Dec 7, 2020
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wrap the read_scalar call at

There are quite a few read_scalar calls in try_visit_primitive that will all have this problem, so ideally they should all be treated this way. To avoid code duplication, it will probably make sense to move this into a helper function.

@RalfJung RalfJung added the E-mentor Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion. label Dec 20, 2020
@RalfJung RalfJung mentioned this issue Jan 3, 2021
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JohnTitor added a commit to JohnTitor/rust that referenced this issue Jan 26, 2021
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Rollup merge of rust-lang#80900 - camelid:readpointerasbytes-ice, r=o…
541a73f 
…li-obk

Fix ICE with `ReadPointerAsBytes` validation error

Fixes rust-lang#79690.

r? `````@oli-obk`````
@bors bors closed this as completed in c2c90bf Jan 26, 2021
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Reopening this to track that read_scalar is still called unguarded a few times in try_visit_primitive, so e.g. the issue can still arise with bool.

@RalfJung RalfJung reopened this Jan 27, 2021
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A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) C-bug Category: This is a bug. E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue. E-mentor Call for participation: This issue has a mentor. Use #t-compiler/help on Zulip for discussion. glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ P-medium Medium priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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