dsync: race condition where done/finish is received after one side closes #10
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…s closed We do not tell the remote we are closing if they have already told us because they close the connection after sending ITEM_FINISH or ITEM_DONE and will not be ever receive anything else from us unless it just happens to get combined into the same packet as a previous response and is already in the buffer.
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DovecotSync
pushed a commit
that referenced
this pull request
Jul 9, 2019
This fixes a race condition where the http_client_host_shared_idle_timeout()
function would get called with an already freed hshared argument.
Specifically, the situation arises from the hshared idle timeout calling
http_client_host_shared_free(), which removes the timeout and then proceeds to
free the client queue. The client queue freeing code indirectly calls
http_client_host_shared_check_idle(), which notices that there is no idle
timeout and allocates one.
The backtrace at the point of this new timeout allocation:
frame #3: 0x00007f0c775897f0 libdovecot.so.0`timeout_add_to(...) ioloop.c:280
frame #4: 0x00007f0c7751a45f libdovecot.so.0`http_client_host_shared_check_idle(hshared=<unavailable>) at http-client-host.c:69
frame #5: 0x00007f0c7750de89 libdovecot.so.0`http_client_request_error(_req=<unavailable>, status=9000, error="") at http-client-request.c:1525
frame #6: 0x00007f0c77517f38 libdovecot.so.0`http_client_queue_fail_full(queue=0x000055e13cff0e10, status=9000, error="", all=<unavailable>) at http-client-queue.c:183
frame #7: 0x00007f0c77518baa libdovecot.so.0`http_client_queue_free(queue=0x000055e13cff0e10) at http-client-queue.c:141
frame #8: 0x00007f0c7751a8bc libdovecot.so.0`http_client_host_free_shared(_host=<unavailable>) at http-client-host.c:391
frame #9: 0x00007f0c7751ab4c libdovecot.so.0`http_client_host_shared_free(_hshared=0x00007ffdac109e48) at http-client-host.c:294
frame #10: 0x00007f0c7751ace8 libdovecot.so.0`http_client_host_shared_idle_timeout(hshared=<unavailable>) at http-client-host.c:40
frame #11: 0x00007f0c7758a1a4 libdovecot.so.0`io_loop_handle_timeouts at ioloop.c:682
frame #12: 0x00007f0c7758a089 libdovecot.so.0`io_loop_handle_timeouts(ioloop=0x000055e13cfc8d80) at ioloop.c:696
frame #13: 0x00007f0c7758befc libdovecot.so.0`io_loop_handler_run_internal(ioloop=0x000055e13cfc8d80) at ioloop-select.c:126
frame #14: 0x00007f0c7758a56d libdovecot.so.0`io_loop_handler_run(ioloop=<unavailable>) at ioloop.c:767
frame #15: 0x00007f0c7758a798 libdovecot.so.0`io_loop_run(ioloop=0x000055e13cfc8d80) at ioloop.c:740
frame #16: 0x00007f0c774f61eb libdovecot.so.0`master_service_run(service=0x000055e13cfc8c10, callback=<unavailable>) at master-service.c:782
frame #17: 0x000055e13b48e3a5 stats`main(argc=<unavailable>, argv=<unavailable>) at main.c:99
frame #18: 0x00007f0c771092e1 libc.so.6`__libc_start_main + 241
frame #19: 0x000055e13b48e41a stats`_start + 42
DovecotSync
pushed a commit
that referenced
this pull request
Jul 9, 2019
This fixes a race condition where the http_client_host_shared_idle_timeout()
function would get called with an already freed hshared argument.
Specifically, the situation arises from the hshared idle timeout calling
http_client_host_shared_free(), which removes the timeout and then proceeds to
free the client queue. The client queue freeing code indirectly calls
http_client_host_shared_check_idle(), which notices that there is no idle
timeout and allocates one.
The backtrace at the point of this new timeout allocation:
frame #3: 0x00007f0c775897f0 libdovecot.so.0`timeout_add_to(...) ioloop.c:280
frame #4: 0x00007f0c7751a45f libdovecot.so.0`http_client_host_shared_check_idle(hshared=<unavailable>) at http-client-host.c:69
frame #5: 0x00007f0c7750de89 libdovecot.so.0`http_client_request_error(_req=<unavailable>, status=9000, error="") at http-client-request.c:1525
frame #6: 0x00007f0c77517f38 libdovecot.so.0`http_client_queue_fail_full(queue=0x000055e13cff0e10, status=9000, error="", all=<unavailable>) at http-client-queue.c:183
frame #7: 0x00007f0c77518baa libdovecot.so.0`http_client_queue_free(queue=0x000055e13cff0e10) at http-client-queue.c:141
frame #8: 0x00007f0c7751a8bc libdovecot.so.0`http_client_host_free_shared(_host=<unavailable>) at http-client-host.c:391
frame #9: 0x00007f0c7751ab4c libdovecot.so.0`http_client_host_shared_free(_hshared=0x00007ffdac109e48) at http-client-host.c:294
frame #10: 0x00007f0c7751ace8 libdovecot.so.0`http_client_host_shared_idle_timeout(hshared=<unavailable>) at http-client-host.c:40
frame #11: 0x00007f0c7758a1a4 libdovecot.so.0`io_loop_handle_timeouts at ioloop.c:682
frame #12: 0x00007f0c7758a089 libdovecot.so.0`io_loop_handle_timeouts(ioloop=0x000055e13cfc8d80) at ioloop.c:696
frame #13: 0x00007f0c7758befc libdovecot.so.0`io_loop_handler_run_internal(ioloop=0x000055e13cfc8d80) at ioloop-select.c:126
frame #14: 0x00007f0c7758a56d libdovecot.so.0`io_loop_handler_run(ioloop=<unavailable>) at ioloop.c:767
frame #15: 0x00007f0c7758a798 libdovecot.so.0`io_loop_run(ioloop=0x000055e13cfc8d80) at ioloop.c:740
frame #16: 0x00007f0c774f61eb libdovecot.so.0`master_service_run(service=0x000055e13cfc8c10, callback=<unavailable>) at master-service.c:782
frame #17: 0x000055e13b48e3a5 stats`main(argc=<unavailable>, argv=<unavailable>) at main.c:99
frame #18: 0x00007f0c771092e1 libc.so.6`__libc_start_main + 241
frame #19: 0x000055e13b48e41a stats`_start + 42
DovecotSync
pushed a commit
that referenced
this pull request
Jul 12, 2019
This fixes a race condition where the http_client_host_shared_idle_timeout()
function would get called with an already freed hshared argument.
Specifically, the situation arises from the hshared idle timeout calling
http_client_host_shared_free(), which removes the timeout and then proceeds to
free the client queue. The client queue freeing code indirectly calls
http_client_host_shared_check_idle(), which notices that there is no idle
timeout and allocates one.
The backtrace at the point of this new timeout allocation:
frame #3: 0x00007f0c775897f0 libdovecot.so.0`timeout_add_to(...) ioloop.c:280
frame #4: 0x00007f0c7751a45f libdovecot.so.0`http_client_host_shared_check_idle(hshared=<unavailable>) at http-client-host.c:69
frame #5: 0x00007f0c7750de89 libdovecot.so.0`http_client_request_error(_req=<unavailable>, status=9000, error="") at http-client-request.c:1525
frame #6: 0x00007f0c77517f38 libdovecot.so.0`http_client_queue_fail_full(queue=0x000055e13cff0e10, status=9000, error="", all=<unavailable>) at http-client-queue.c:183
frame #7: 0x00007f0c77518baa libdovecot.so.0`http_client_queue_free(queue=0x000055e13cff0e10) at http-client-queue.c:141
frame #8: 0x00007f0c7751a8bc libdovecot.so.0`http_client_host_free_shared(_host=<unavailable>) at http-client-host.c:391
frame #9: 0x00007f0c7751ab4c libdovecot.so.0`http_client_host_shared_free(_hshared=0x00007ffdac109e48) at http-client-host.c:294
frame #10: 0x00007f0c7751ace8 libdovecot.so.0`http_client_host_shared_idle_timeout(hshared=<unavailable>) at http-client-host.c:40
frame #11: 0x00007f0c7758a1a4 libdovecot.so.0`io_loop_handle_timeouts at ioloop.c:682
frame #12: 0x00007f0c7758a089 libdovecot.so.0`io_loop_handle_timeouts(ioloop=0x000055e13cfc8d80) at ioloop.c:696
frame #13: 0x00007f0c7758befc libdovecot.so.0`io_loop_handler_run_internal(ioloop=0x000055e13cfc8d80) at ioloop-select.c:126
frame #14: 0x00007f0c7758a56d libdovecot.so.0`io_loop_handler_run(ioloop=<unavailable>) at ioloop.c:767
frame #15: 0x00007f0c7758a798 libdovecot.so.0`io_loop_run(ioloop=0x000055e13cfc8d80) at ioloop.c:740
frame #16: 0x00007f0c774f61eb libdovecot.so.0`master_service_run(service=0x000055e13cfc8c10, callback=<unavailable>) at master-service.c:782
frame #17: 0x000055e13b48e3a5 stats`main(argc=<unavailable>, argv=<unavailable>) at main.c:99
frame #18: 0x00007f0c771092e1 libc.so.6`__libc_start_main + 241
frame #19: 0x000055e13b48e41a stats`_start + 42
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We do not tell the remote we are closing if they have
already told us because they close the
connection after sending ITEM_FINISH or ITEM_DONE and will
not be ever receive anything else from us unless
it just happens to get combined into the same packet
as a previous response and is already in the buffer.
This solved the problem I reported here
http://www.dovecot.org/list/dovecot/2016-May/104337.html
I was getting a EPIPE about 1:30 dsync runs over the socket. I have received 0 in 10000 runs with this change.