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[SR-3335] Crash in _os_object_retain called by dispatch_io_write (by DispatchIO.write) #708

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weissi opened this issue Dec 5, 2016 · 1 comment
Closed

[SR-3335] Crash in _os_object_retain called by dispatch_io_write (by DispatchIO.write) #708

weissi opened this issue Dec 5, 2016 · 1 comment
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bug libdispatch RunTimeCrash

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@weissi
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weissi commented Dec 5, 2016

Previous ID SR-3335
Radar rdar://problem/29513290
Original Reporter @weissi
Type Bug
Status Resolved
Resolution Done

Attachment: Download

Additional Detail from JIRA
Votes 0
Component/s libdispatch
Labels Bug, RunTimeCrash
Assignee None
Priority Medium

md5: 3292f2ad5755906bf415eb0320ddb747

Issue Description:

I was trying to reproduce some hang I'm sometimes seeing with DispatchIO (still possible to be somewhere in my code). Whilst trying to come up with a repro program I reached a stage of a program, that reliably crashes on macOS and Linux.

* thread #​17: tid = 29284, 0x00007ffff7f17b07 libdispatch.so`_os_object_retain + 23, name = 'repro', stop reason = signal SIGILL: illegal instruction operand
  * frame #​0: 0x00007ffff7f17b07 libdispatch.so`_os_object_retain + 23
    frame #​1: 0x00007ffff7f13a64 libdispatch.so`dispatch_io_write + 36
    frame #​2: 0x00007ffff7f2e170 libdispatch.so`_TFC8Dispatch10DispatchIO5writefT6offsetSi4dataVS_12DispatchData5queueCS_13DispatchQueue9ioHandlerFTSbGSqS1__Vs5Int32_T__T_ + 208
    frame #​3: 0x0000000000404548 repro`_TFFFF5repro4mainFT_T_U_FTVs5Int32S0__T_U3_FTSbGSqV8Dispatch12DispatchData_S0__T_U_FT_T_ + 104
    frame #​4: 0x00000000004046a7 repro`_TTRXFo___XFdCb___ + 39
    frame #​5: 0x00007ffff7f10e37 libdispatch.so`_dispatch_call_block_and_release + 7
    frame #​6: 0x00007ffff7f1d2f1 libdispatch.so`_dispatch_queue_serial_drain + 737
    frame #​7: 0x00007ffff7f1d931 libdispatch.so`_dispatch_queue_invoke + 849
    frame #​8: 0x00007ffff7f1f9a9 libdispatch.so`_dispatch_root_queue_drain + 393
    frame #&#8203;9: 0x00007ffff7f44408 libdispatch.so`overcommit_worker_main(unused=<unavailable>) + 152 at manager.c:315
    frame #&#8203;10: 0x00007ffff77dc70a libpthread.so.0`start_thread + 202
    frame #&#8203;11: 0x00007ffff5d7382d libc.so.6`__clone + 109 at clone.S:109

Repro

1. compile and the attached program (swiftc repro.swift && ./repro)
2. you'll see crashes

Notes

Linux

$ swift -version
Swift version 3.0-dev (LLVM 56c58af739, Clang 205968da71, Swift e60daaaee1)
Target: x86_64-unknown-linux-gnu

macOS

$ swift -version
Apple Swift version 3.0.1 (swiftlang-800.0.58.6 clang-800.0.42.1)
Target: x86_64-apple-macosx10.9
@weissi
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weissi commented Jul 13, 2017

fixed in Swift 4, potentially earlier.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 5, 2022
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