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  1. Qt
  2. QTBUG-49502

Crash in QBasicMutex::unlockInternal on exit

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Details

    • Bug
    • Resolution: Duplicate
    • Not Evaluated
    • 5.5.1
    • 5.3.0
    • Core: Threads
    • None
    • Mac OS X 10.5.5
      32-bit build
    • 314c83c0c2f91532654f869b7dc6af1b7e8538da

    Description

      We experience the occasional crash on exit on a background thread (the QQmlThread) with the following typical stack trace:

      Thread 3 Crashed:: QQmlThread
0   QtCore                        	0x0366fd9c QBasicMutex::unlockInternal() + 460
1   QtCore                        	0x0366f4bd QMutex::unlock() + 45
2   QtCore                        	0x036773f9 QThreadPrivate::finish(void*) + 281
3   QtCore                        	0x0367718f QThreadPrivate::start(void*) + 383
4   libsystem_pthread.dylib       	0x985dcc25 _pthread_body + 138
5   libsystem_pthread.dylib       	0x985dcb9b _pthread_start + 162
6   libsystem_pthread.dylib       	0x985d9e32 thread_start + 34

      Another view (with disassembly):

      Thread[3] EXC_BAD_ACCESS (SIGSEGV) (KERN_INVALID_ADDRESS at 0x0000000000000000)
[  0] 0x0000000003600d9c QtCore`QBasicMutex::unlockInternal() + 460

     0x0000000003600d94:       jl 0x2bd80              ; QBasicMutex::unlockInternal() + 432
     0x0000000003600d96:      jmp 0x2bd9c              ; QBasicMutex::unlockInternal() + 460
     0x0000000003600d98:     movl %edi, %esi
     0x0000000003600d9a:     movl %ebx, %edx
 ->  0x0000000003600d9c:     movl (%ecx,%edx,4), %eax
     0x0000000003600d9f:    imull $0x1c, %esi, %edx
     0x0000000003600da2:     leal 0x18(%eax,%edx), %esi
     0x0000000003600da6:     movl -0x1c(%ebp), %edi
     0x0000000003600da9:     nopl (%eax)

[  1] 0x00000000036004bc QtCore`QMutex::unlock() + 44
[  2] 0x00000000036083f8 QtCore`QThreadPrivate::finish(void*) + 280
[  3] 0x000000000360818e QtCore`QThreadPrivate::start(void*) + 382
[  4] 0x000000009a3aac25 _pthread_body + 138
[  5] 0x000000009a3aab9b _pthread_start + 162
[  6] 0x000000009a3a7e32 thread_start + 34

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          is replaced by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-47554 Stack overflow caused by infinite recursion in QMutex

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
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              thiago Thiago Macieira
              dan.erik.petersen Dan Erik Petersen
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              Dates

                Created:
                Updated:
                Resolved:

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