regression 1.46 -> 1.47 big-endian backtrace-related UI tests failing #77410

infinity0 · 2020-10-01T16:47:05Z

test [ui] ui/backtrace-debuginfo.rs ... FAILED
test [ui] ui/backtrace.rs ... FAILED
test [ui] ui/std-backtrace.rs ... FAILED

OK on 1.46: s390x | ppc64
fails on 1.47: s390x | powerpc | ppc64 | sparc64

In all cases, we are using gdb 9.2 and LLVM 10.

The tests themselves haven't changed since ~1.38, so it must be an actual behavioural change in rustc.

ui/backtrace-debuginfo.rs

---- [ui] ui/backtrace-debuginfo.rs stdout ----


executing "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/stage2/bin/rustc" "/<<PKGBUILDDIR>>/src/test/ui/backtrace-debuginfo.rs" "-Zthreads=1" "--target=s390x-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-C" "prefer-dynamic" "-o" "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/test/ui/backtrace-debuginfo/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/native/rust-test-helpers" "-Clinker=s390x-linux-gnu-gcc" "-g" "-Cllvm-args=-enable-tail-merge=0" "-Cllvm-args=-opt-bisect-limit=0" "-Cforce-frame-pointers=yes" "-L" "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/test/ui/backtrace-debuginfo/auxiliary"
------stdout------------------------------

------stderr------------------------------
BISECT: NOT running pass (1) Simplify the CFG on function (_ZN100_$LT$core..slice..Iter$LT$T$GT$$u20$as$u20$core..iter..traits..double_ended..DoubleEndedIterator$GT$9next_back17hba41810a48013369E)
BISECT: NOT running pass (2) SROA on function (_ZN100_$LT$core..slice..Iter$LT$T$GT$$u20$as$u20$core..iter..traits..double_ended..DoubleEndedIterator$GT$9next_back17hba41810a48013369E)
[.. snip ..]
BISECT: NOT running pass (151906) Stack Slot Coloring on function (main)
BISECT: NOT running pass (151907) Machine Copy Propagation Pass on function (main)
BISECT: NOT running pass (151908) Machine Loop Invariant Code Motion on function (main)
BISECT: NOT running pass (151909) PostRA Machine Sink on function (main)
BISECT: NOT running pass (151910) Shrink Wrapping analysis on function (main)
BISECT: NOT running pass (151911) Control Flow Optimizer on function (main)
BISECT: NOT running pass (151912) Tail Duplication on function (main)
BISECT: NOT running pass (151913) Machine Copy Propagation Pass on function (main)
BISECT: NOT running pass (151914) If Converter on function (main)
BISECT: NOT running pass (151915) Branch Probability Basic Block Placement on function (main)
BISECT: NOT running pass (151916) SystemZ Instruction Shortening on function (main)
BISECT: NOT running pass (151917) SystemZ Comparison Elimination on function (main)
BISECT: NOT running pass (151918) PostRA Machine Instruction Scheduler on function (main)

------------------------------------------
executing "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/test/ui/backtrace-debuginfo/a"
------stdout------------------------------
---------------------------------------
trace does not match position list
still need to find ["backtrace-debuginfo.rs:189", "backtrace-debuginfo.rs:125"]

--- stdout
backtrace-debuginfo.rs:125
backtrace-debuginfo.rs:189

--- stderr
test case 0
thread 'main' panicked at 'explicit panic', /<<PKGBUILDDIR>>/src/test/ui/backtrace-debuginfo.rs:86:5
stack backtrace:
   0:      0x3ff7f781048 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hf75f205f89fe00ed
   1:      0x3ff7f898448 - core::fmt::write::h4f1c2070906884a3
   2:      0x3ff7f780a02 - std::io::Write::write_fmt::h226b2e1f14ad2764
   3:      0x3ff7f7c415e - std::panicking::default_hook::h9ae8480279f42440
   4:      0x3ff7f7c4ff8 - std::panicking::rust_panic_with_hook::haa0e4552a4685cd1
   5:      0x2aa08f936b6 - <unknown>
   6:      0x2aa08f934ee - <unknown>
   7:      0x2aa08f9e64e - <unknown>
   8:      0x2aa08f9102a - <unknown>
   9:      0x2aa08f91586 - <unknown>
  10:      0x2aa08f920cc - <unknown>
  11:      0x2aa08f93766 - <unknown>
  12:      0x2aa08f9354a - <unknown>
  13:      0x2aa08f93600 - <unknown>
  14:      0x3ff7f7c49e2 - std::panicking::try::do_call::hb8645513a8eb3708
  15:      0x3ff7f7c6834 - __rust_try.llvm.10017331706622121556
  16:      0x3ff7f7c5520 - std::rt::lang_start_internal::h8d96ae79e52a8f4b
  17:      0x2aa08f935ce - <unknown>
  18:      0x2aa08f9216e - <unknown>
  19:      0x3ff7f42b3ce - __libc_start_main
  20:      0x2aa08f834f4 - <unknown>
  21:                0x0 - <unknown>

---------------------------------------
trace does not match position list
still need to find ["backtrace-debuginfo.rs:189", "backtrace-debuginfo.rs:125"]

--- stdout
backtrace-debuginfo.rs:125
backtrace-debuginfo.rs:189

--- stderr
test case 1
thread 'main' panicked at 'explicit panic', /<<PKGBUILDDIR>>/src/test/ui/backtrace-debuginfo.rs:87:5
stack backtrace:
   0:      0x3ffa0201048 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hf75f205f89fe00ed
   1:      0x3ffa0318448 - core::fmt::write::h4f1c2070906884a3
   2:      0x3ffa0200a02 - std::io::Write::write_fmt::h226b2e1f14ad2764
   3:      0x3ffa024415e - std::panicking::default_hook::h9ae8480279f42440
   4:      0x3ffa0244ff8 - std::panicking::rust_panic_with_hook::haa0e4552a4685cd1
   5:      0x2aa182136b6 - <unknown>
   6:      0x2aa182134ee - <unknown>
   7:      0x2aa1821e64e - <unknown>
   8:      0x2aa182110c6 - <unknown>
   9:      0x2aa18211586 - <unknown>
  10:      0x2aa182120cc - <unknown>
  11:      0x2aa18213766 - <unknown>
  12:      0x2aa1821354a - <unknown>
  13:      0x2aa18213600 - <unknown>
  14:      0x3ffa02449e2 - std::panicking::try::do_call::hb8645513a8eb3708
  15:      0x3ffa0246834 - __rust_try.llvm.10017331706622121556
  16:      0x3ffa0245520 - std::rt::lang_start_internal::h8d96ae79e52a8f4b
  17:      0x2aa182135ce - <unknown>
  18:      0x2aa1821216e - <unknown>
  19:      0x3ff9feab3ce - __libc_start_main
  20:      0x2aa182034f4 - <unknown>
  21:                0x0 - <unknown>

---------------------------------------
trace does not match position list
still need to find ["backtrace-debuginfo.rs:189", "backtrace-debuginfo.rs:125", "backtrace-debuginfo.rs:88", "backtrace-debuginfo-aux.rs:6"]

--- stdout
backtrace-debuginfo-aux.rs:6
backtrace-debuginfo.rs:88
backtrace-debuginfo.rs:125
backtrace-debuginfo.rs:189

--- stderr
test case 2
thread 'main' panicked at 'explicit panic', /<<PKGBUILDDIR>>/src/test/ui/backtrace-debuginfo.rs:89:9
stack backtrace:
   0:      0x3ffadb01048 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hf75f205f89fe00ed
   1:      0x3ffadc18448 - core::fmt::write::h4f1c2070906884a3
   2:      0x3ffadb00a02 - std::io::Write::write_fmt::h226b2e1f14ad2764
   3:      0x3ffadb4415e - std::panicking::default_hook::h9ae8480279f42440
   4:      0x3ffadb44ff8 - std::panicking::rust_panic_with_hook::haa0e4552a4685cd1
   5:      0x2aa366936b6 - <unknown>
   6:      0x2aa366934ee - <unknown>
   7:      0x2aa3669e64e - <unknown>
   8:      0x2aa36693404 - <unknown>
   9:      0x2aa36693340 - <unknown>
  10:      0x2aa36691082 - <unknown>
  11:      0x2aa36691586 - <unknown>
  12:      0x2aa366920cc - <unknown>
  13:      0x2aa36693766 - <unknown>
  14:      0x2aa3669354a - <unknown>
  15:      0x2aa36693600 - <unknown>
  16:      0x3ffadb449e2 - std::panicking::try::do_call::hb8645513a8eb3708
  17:      0x3ffadb46834 - __rust_try.llvm.10017331706622121556
  18:      0x3ffadb45520 - std::rt::lang_start_internal::h8d96ae79e52a8f4b
  19:      0x2aa366935ce - <unknown>
  20:      0x2aa3669216e - <unknown>
  21:      0x3ffad7ab3ce - __libc_start_main
  22:      0x2aa366834f4 - <unknown>
  23:                0x0 - <unknown>

[.. snip .. many more examples like this ..]


------------------------------------------
stderr:
------------------------------------------
thread 'main' panicked at 'found some errors', /<<PKGBUILDDIR>>/src/test/ui/backtrace-debuginfo.rs:179:9
stack backtrace:
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

------------------------------------------

ui/backtrace.rs

---- [ui] ui/backtrace.rs stdout ----


executing "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/stage2/bin/rustc" "/<<PKGBUILDDIR>>/src/test/ui/backtrace.rs" "-Zthreads=1" "--target=s390x-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-C" "prefer-dynamic" "-o" "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/test/ui/backtrace/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/native/rust-test-helpers" "-Clinker=s390x-linux-gnu-gcc" "-g" "-L" "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/test/ui/backtrace/auxiliary"
------stdout------------------------------

------stderr------------------------------

------------------------------------------
executing "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/test/ui/backtrace/a"
------stdout------------------------------

------stderr------------------------------
thread 'main' panicked at 'bad output: thread 'main' panicked at 'explicit panic', /<<PKGBUILDDIR>>/src/test/ui/backtrace.rs:18:9
stack backtrace:
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
', /<<PKGBUILDDIR>>/src/test/ui/backtrace.rs:68:5
stack backtrace:
   0: rust_begin_unwind
   1: std::panicking::begin_panic_fmt
   2: <unknown>
   3: <unknown>
   4: <unknown>
   5: std::panicking::try::do_call
   6: __rust_try.llvm.10017331706622121556
   7: std::rt::lang_start_internal
   8: <unknown>
   9: __libc_start_main
  10: <unknown>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

------------------------------------------

error: test run failed!
status: exit code: 101
command: "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/test/ui/backtrace/a"
stdout:
------------------------------------------

------------------------------------------
stderr:
------------------------------------------
thread 'main' panicked at 'bad output: thread 'main' panicked at 'explicit panic', /<<PKGBUILDDIR>>/src/test/ui/backtrace.rs:18:9
stack backtrace:
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
', /<<PKGBUILDDIR>>/src/test/ui/backtrace.rs:68:5
stack backtrace:
   0: rust_begin_unwind
   1: std::panicking::begin_panic_fmt
   2: <unknown>
   3: <unknown>
   4: <unknown>
   5: std::panicking::try::do_call
   6: __rust_try.llvm.10017331706622121556
   7: std::rt::lang_start_internal
   8: <unknown>
   9: __libc_start_main
  10: <unknown>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

------------------------------------------

ui/std-backtrace.rs

---- [ui] ui/std-backtrace.rs stdout ----


executing "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/stage2/bin/rustc" "/<<PKGBUILDDIR>>/src/test/ui/std-backtrace.rs" "-Zthreads=1" "--target=s390x-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-C" "prefer-dynamic" "-o" "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/test/ui/std-backtrace/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/native/rust-test-helpers" "-Clinker=s390x-linux-gnu-gcc" "-g" "-L" "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/test/ui/std-backtrace/auxiliary"
------stdout------------------------------

------stderr------------------------------

------------------------------------------
executing "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/test/ui/std-backtrace/a"
------stdout------------------------------

------stderr------------------------------
thread 'main' panicked at 'assertion failed: String::from_utf8_lossy(&p.stdout).contains("backtrace::main")', /<<PKGBUILDDIR>>/src/test/ui/std-backtrace.rs:35:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

------------------------------------------

error: test run failed!
status: exit code: 101
command: "/<<PKGBUILDDIR>>/build/s390x-unknown-linux-gnu/test/ui/std-backtrace/a"
stdout:
------------------------------------------

------------------------------------------
stderr:
------------------------------------------
thread 'main' panicked at 'assertion failed: String::from_utf8_lossy(&p.stdout).contains("backtrace::main")', /<<PKGBUILDDIR>>/src/test/ui/std-backtrace.rs:35:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

------------------------------------------

The text was updated successfully, but these errors were encountered:

infinity0 · 2020-10-01T17:09:12Z

@alexcrichton could this be related to #74682 ?

alexcrichton · 2020-10-01T22:46:51Z

Seems likely! If this is happening on big-endian platforms then there's likely an issue with endianness in (most likely) src/backtrace/gimli/*.rs. It could also be in gimli itself or addr2line, but it seems most likely to be in the integration in the backtrace crate itself.

jyn514 · 2020-10-07T14:21:18Z

Related: #77424

camelid · 2020-10-07T19:43:06Z

Assigning P-high and removing I-prioritize as discussed in the prioritization working group.

nagisa · 2020-10-08T15:08:33Z

I'll try to run gimli etc things on a sparc, but no promises of success.

cuviper · 2020-10-08T20:07:48Z

I have an s390x machine at hand, so I tried a few things. Plain cargo test passes for gimli, addr2line, and object, but backtrace fails two tests:

     Running target/debug/deps/accuracy-18628a8819e01c2c

running 1 test
test doit ... FAILED

failures:

---- doit stdout ----
-----------------------------------
looking for:
        tests/accuracy/main.rs:40
        crates/dylib-dep/src/lib.rs:11
        tests/accuracy/main.rs:39
found:
   0: <unknown>
   1: <unknown>
   2: <unknown>
   3: <unknown>
   4: <unknown>
   5: <unknown>
   6: <unknown>
   7: <unknown>
   8: <unknown>
   9: <unknown>
  10: <unknown>
  11: <unknown>
  12: <unknown>
  13: <unknown>
  14: <unknown>
  15: <unknown>
  16: start_thread
  17: <unknown>

thread 'doit' panicked at 'failed to find tests/accuracy/main.rs:40', tests/accuracy/main.rs:104:25
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

     Running target/debug/deps/smoke-9c443e6c4ee6f0fc

running 3 tests
test smoke_test_frames ... FAILED
test sp_smoke_test ... ok
test many_threads ... test many_threads has been running for over 60 seconds
test many_threads ... ok

failures:

---- smoke_test_frames stdout ----
thread 'smoke_test_frames' panicked at 'assertion failed: !can_resolve', tests/smoke.rs:180:25
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

There are also warnings about FFI safety, but I don't know if they're relevant.

warning: `extern` fn uses type `(&str, u32)`, which is not FFI-safe
  --> crates/dylib-dep/src/lib.rs:10:30
   |
10 | pub extern "C" fn foo(outer: Pos, inner: fn(Pos, Pos)) {
   |                              ^^^ not FFI-safe
   |
   = note: `#[warn(improper_ctypes_definitions)]` on by default
   = help: consider using a struct instead
   = note: tuples have unspecified layout

warning: `extern` fn uses type `fn((&str, u32), (&str, u32))`, which is not FFI-safe
  --> crates/dylib-dep/src/lib.rs:10:42
   |
10 | pub extern "C" fn foo(outer: Pos, inner: fn(Pos, Pos)) {
   |                                          ^^^^^^^^^^^^ not FFI-safe
   |
   = help: consider using an `extern fn(...) -> ...` function pointer instead
   = note: this function pointer has Rust-specific calling convention

warning: 2 warnings emitted

jyn514 · 2020-10-08T20:35:13Z

It may be easier to reproduce on a mac: #77424

cuviper · 2020-10-08T20:49:48Z

Mac may have a very different issue, since it's apparently a big-endian thing here.
(Plus I don't have a mac at all. 😉 )

cuviper · 2020-10-08T22:33:46Z

Well, this will do it:
https://github.com/rust-lang/backtrace-rs/blob/2b51e00670927b58255f92f2281367187a49f370/src/symbolize/gimli.rs#L8

use self::gimli::LittleEndian as Endian;

I think this should this be NativeEndian, unless there's support for backtracing other processes.

camelid · 2020-10-08T22:37:04Z

Side note: does this need to be updated?

https://github.com/rust-lang/backtrace-rs/blob/2b51e00670927b58255f92f2281367187a49f370/src/symbolize/gimli.rs#L3-L5

`Object` uses `NativeEndian`, so the `Context` should too. Cc: rust-lang/rust#77410

rustbot added the I-prioritize Issue: Indicates that prioritization has been requested for this issue. label Oct 1, 2020

camelid added the T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. label Oct 7, 2020

camelid added I-nominated P-high High priority and removed I-prioritize Issue: Indicates that prioritization has been requested for this issue. labels Oct 7, 2020

nagisa self-assigned this Oct 8, 2020

cuviper added a commit to cuviper/backtrace-rs that referenced this issue Oct 8, 2020

use NativeEndian in symbolize::gimli::Context

6f8efee

`Object` uses `NativeEndian`, so the `Context` should too. Cc: rust-lang/rust#77410

cuviper mentioned this issue Oct 8, 2020

use NativeEndian in symbolize::gimli::Context rust-lang/backtrace-rs#373

Merged

alexcrichton pushed a commit to rust-lang/backtrace-rs that referenced this issue Oct 8, 2020

use NativeEndian in symbolize::gimli::Context (#373)

616407e

`Object` uses `NativeEndian`, so the `Context` should too. Cc: rust-lang/rust#77410

cuviper mentioned this issue Oct 9, 2020

Update the backtrace crate to fix big-endian ELF #77731

Merged

bors closed this as completed in cae8bc1 Oct 10, 2020

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Uh oh!

regression 1.46 -> 1.47 big-endian backtrace-related UI tests failing #77410

regression 1.46 -> 1.47 big-endian backtrace-related UI tests failing #77410

infinity0 commented Oct 1, 2020

infinity0 commented Oct 1, 2020

Uh oh!

alexcrichton commented Oct 1, 2020

Uh oh!

jyn514 commented Oct 7, 2020

Uh oh!

camelid commented Oct 7, 2020

Uh oh!

nagisa commented Oct 8, 2020

Uh oh!

cuviper commented Oct 8, 2020

Uh oh!

jyn514 commented Oct 8, 2020

Uh oh!

cuviper commented Oct 8, 2020

Uh oh!

cuviper commented Oct 8, 2020

Uh oh!

camelid commented Oct 8, 2020

Uh oh!

regression 1.46 -> 1.47 big-endian backtrace-related UI tests failing #77410

regression 1.46 -> 1.47 big-endian backtrace-related UI tests failing #77410

Comments

infinity0 commented Oct 1, 2020

infinity0 commented Oct 1, 2020

Uh oh!

alexcrichton commented Oct 1, 2020

Uh oh!

jyn514 commented Oct 7, 2020

Uh oh!

camelid commented Oct 7, 2020

Uh oh!

nagisa commented Oct 8, 2020

Uh oh!

cuviper commented Oct 8, 2020

Uh oh!

jyn514 commented Oct 8, 2020

Uh oh!

cuviper commented Oct 8, 2020

Uh oh!

cuviper commented Oct 8, 2020

Uh oh!

camelid commented Oct 8, 2020

Uh oh!