应用挂起__psynch_mutexwait

Question

应用挂起__psynch_mutexwait

Cas*_*ato 11 multithreading mutex core-data freeze ios

我们的应用似乎是半随机挂在psynch_mutexwait.它似乎与更新存储在CoreData中的大量数据的后台进程有关 - 但我完全无法弄清楚是谁锁定导致死锁的原因.

以下是lldb给我的完整堆栈跟踪 - 这显然是不完整的,并且线程1的最后一帧是伪造的.在那之前,我在该方法中有一个断点,它从未被击中过.

是否有任何方法可以确定正在等待什么锁？(或者甚至获得正确的堆栈跟踪？)当然,涉及很多代码,这使得随机NSLog语句成为一项艰巨的任务.

(lldb) bt all
* thread #1: tid = 0x2503, 0x39da20fc libsystem_kernel.dylib`__psynch_mutexwait + 24, stop reason = signal SIGSTOP
    frame #0: 0x39da20fc libsystem_kernel.dylib`__psynch_mutexwait + 24
    frame #1: 0x39ceb128 libsystem_c.dylib`pthread_mutex_lock + 392
    frame #2: 0x00022068 OnDeck`-[AttendanceWorkoutsController buildTable](self=0x00000003, _cmd=0x00000000) + 508 at AttendanceWorkoutsController.m:100

  thread #2: tid = 0x2803, 0x39d92648 libsystem_kernel.dylib`kevent64 + 24
    frame #0: 0x39d92648 libsystem_kernel.dylib`kevent64 + 24
    frame #1: 0x39ccb4f0 libdispatch.dylib`_dispatch_mgr_invoke + 796

  thread #5: tid = 0x2b03, 0x39d91eb4 libsystem_kernel.dylib`mach_msg_trap + 20
    frame #0: 0x39d91eb4 libsystem_kernel.dylib`mach_msg_trap + 20
    frame #1: 0x39d9204c libsystem_kernel.dylib`mach_msg + 40

  thread #6: tid = 0x242f, 0x39d91eb4 libsystem_kernel.dylib`mach_msg_trap + 20
    frame #0: 0x39d91eb4 libsystem_kernel.dylib`mach_msg_trap + 20
    frame #1: 0x39d9204c libsystem_kernel.dylib`mach_msg + 40

  thread #7: tid = 0x2c03, 0x39da2594 libsystem_kernel.dylib`select$DARWIN_EXTSN + 20
    frame #0: 0x39da2594 libsystem_kernel.dylib`select$DARWIN_EXTSN + 20
    frame #1: 0x31bff1f6 CoreFoundation`__CFSocketManager + 678

  thread #8: tid = 0x2d03, 0x39da2d98 libsystem_kernel.dylib`__workq_kernreturn + 8
    frame #0: 0x39da2d98 libsystem_kernel.dylib`__workq_kernreturn + 8
    frame #1: 0x39cf0cfa libsystem_c.dylib`_pthread_workq_return + 18
(lldb)

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