* frame #0: 0xffffff8026466014 kernel.development`IOUserClient::clientClose(this=0xffffff803bb23200) at IOUserClient.cpp:1552 [opt]
frame #1: 0xffffff8026469164 kernel.development`::iokit_client_died(obj=0xffffff803bb23200, (null)=<unavailable>, type=<unavailable>, mscount=<unavailable>) at IOUserClient.cpp:586 [opt]
frame #2: 0xffffff8025e8427c kernel.development`iokit_notify at iokit_rpc.c:359 [opt]
frame #3: 0xffffff8025e8422e kernel.development`iokit_notify(msg=0xffffff80329f2c90) at iokit_rpc.c:385 [opt]
frame #4: 0xffffff8025d81d6f kernel.development`ipc_kobject_server(request=0xffffff80329f2c00, option=327681) at ipc_kobject.c:364 [opt]
frame #5: 0xffffff8025d54d0d kernel.development`ipc_kmsg_send(kmsg=0xffffff80329f2c00, option=327681, send_timeout=0) at ipc_kmsg.c:1867 [opt]
frame #6: 0xffffff8025d82500 kernel.development`mach_msg_send_from_kernel_proper(msg=<unavailable>, send_size=44) at ipc_mig.c:186 [opt]
frame #7: 0xffffff8025d62842 kernel.development`ipc_right_terminate [inlined] mach_notify_no_senders at mach_notify_user.c:370 [opt]
frame #8: 0xffffff8025d62801 kernel.development`ipc_right_terminate [inlined] ipc_notify_no_senders at ipc_notify.c:144 [opt]
frame #9: 0xffffff8025d62801 kernel.development`ipc_right_terminate(space=0xffffff8042fb56e0, name=84227, entry=<unavailable>) at ipc_right.c:677 [opt]
frame #10: 0xffffff8025d688dc kernel.development`ipc_space_terminate(space=0xffffff80262759c9) at ipc_space.c:426 [opt]
frame #11: 0xffffff8025dab097 kernel.development`task_terminate_internal(task=0xffffff804195bd88) at task.c:2294 [opt]
frame #12: 0xffffff8026275c6f kernel.development`exit_with_reason(p=0xffffff803acfe490, rv=0, retval=<unavailable>, thread_can_terminate=1, perf_notify=1, jetsam_flags=<unavailable>, exit_reason=<unavailable>) at kern_exit.c:833 [opt]
frame #13: 0xffffff80262759f3 kernel.development`exit1 [inlined] exit1_internal(p=<unavailable>, rv=<unavailable>, retval=<unavailable>, thread_can_terminate=1, perf_notify=1, jetsam_flags=0) at kern_exit.c:707 [opt]
frame #14: 0xffffff80262759d4 kernel.development`exit1(p=<unavailable>, rv=<unavailable>, retval=<unavailable>) at kern_exit.c:700 [opt]
frame #15: 0xffffff80262759c9 kernel.development`exit(p=<unavailable>, uap=<unavailable>, retval=<unavailable>) at kern_exit.c:683 [opt]
frame #16: 0xffffff80263a60ca kernel.development`unix_syscall64(state=<unavailable>) at systemcalls.c:382 [opt]
frame #17: 0xffffff8025d20a36 kernel.development`hndl_unix_scall64 + 22
A good practice is to call IOService::terminate() from clientClose(). Below is an except from the IOKit header file.
/*! @function terminate
@abstract Makes an IOService object inactive and begins its destruction.
@discussion Registering an IOService object informs possible clients of its existance and instantiates drivers
that may be used with it; <code>terminate</code> involves the opposite process of informing clients
that an IOService object is no longer able to be used and will be destroyed. By default, if any
client has the service open, <code>terminate</code> fails. If the <code>kIOServiceRequired</code>
flag is passed however, <code>terminate</code> will be successful though further progress in
the destruction of the IOService object will not proceed until the last client has closed it.
The service will be made inactive immediately upon successful termination, and all its clients
will be notified via their @link message message@/link method with a message of type
<code>kIOMessageServiceIsTerminated</code>. Both these actions take place on the caller's thread.
After the IOService object is made inactive, further matching or attach calls will fail on it.
Each client has its @link stop stop@/link method called upon their close of an inactive IOService
object , or on its termination if they do not have it open. After <code>stop</code>, @link detach
detach@/link is called in each client. When all clients have been detached, the @link finalize finalize@/link
method is called in the inactive service. The termination process is inherently asynchronous because
it will be deferred until all clients have chosen to close.
@param options In most cases no options are needed. <code>kIOServiceSynchronous</code> may be passed to cause
<code>terminate</code> to not return until the service is finalized. */
virtual bool terminate( IOOptionBits options = 0 );
Scheduling a client stop and detach from IOService::terminate.
* thread #11, name = '0xffffff80339d0a90', queue = '0x0', stop reason = breakpoint 10.1
* frame #0: 0xffffff80264115b6 kernel.development`IOService::scheduleTerminatePhase2(this=0xffffff8033fbd000, options=4) at IOService.cpp:2257 [opt]
frame #1: 0xffffff80264152b7 kernel.development`IOService::terminatePhase1(this=<unavailable>, options=4) at IOService.cpp:2212 [opt]
frame #2: 0xffffff7fa7fdd83a IOAcceleratorFamily2`IOAccelCommandQueue::clientClose() + 24
frame #3: 0xffffff8026469164 kernel.development`::iokit_client_died(obj=0xffffff8033fbd000, (null)=<unavailable>, type=<unavailable>, mscount=<unavailable>) at IOUserClient.cpp:586 [opt]
frame #4: 0xffffff8025e8427c kernel.development`iokit_notify at iokit_rpc.c:359 [opt]
frame #5: 0xffffff8025e8422e kernel.development`iokit_notify(msg=0xffffff80421d6790) at iokit_rpc.c:385 [opt]
frame #6: 0xffffff8025d81d6f kernel.development`ipc_kobject_server(request=0xffffff80421d6700, option=327681) at ipc_kobject.c:364 [opt]
frame #7: 0xffffff8025d54d0d kernel.development`ipc_kmsg_send(kmsg=0xffffff80421d6700, option=327681, send_timeout=0) at ipc_kmsg.c:1867 [opt]
frame #8: 0xffffff8025d82500 kernel.development`mach_msg_send_from_kernel_proper(msg=<unavailable>, send_size=44) at ipc_mig.c:186 [opt]
frame #9: 0xffffff8025d62842 kernel.development`ipc_right_terminate [inlined] mach_notify_no_senders at mach_notify_user.c:370 [opt]
frame #10: 0xffffff8025d62801 kernel.development`ipc_right_terminate [inlined] ipc_notify_no_senders at ipc_notify.c:144 [opt]
frame #11: 0xffffff8025d62801 kernel.development`ipc_right_terminate(space=0xffffff8042fb4720, name=36099, entry=<unavailable>) at ipc_right.c:677 [opt]
frame #12: 0xffffff8025d688dc kernel.development`ipc_space_terminate(space=0xffffff80262759c9) at ipc_space.c:426 [opt]
frame #13: 0xffffff8025dab097 kernel.development`task_terminate_internal(task=0xffffff8041d10370) at task.c:2294 [opt]
frame #14: 0xffffff8026275c6f kernel.development`exit_with_reason(p=0xffffff803acffb60, rv=0, retval=<unavailable>, thread_can_terminate=1, perf_notify=1, jetsam_flags=<unavailable>, exit_reason=<unavailable>) at kern_exit.c:833 [opt]
frame #15: 0xffffff80262759f3 kernel.development`exit1 [inlined] exit1_internal(p=<unavailable>, rv=<unavailable>, retval=<unavailable>, thread_can_terminate=1, perf_notify=1, jetsam_flags=0) at kern_exit.c:707 [opt]
frame #16: 0xffffff80262759d4 kernel.development`exit1(p=<unavailable>, rv=<unavailable>, retval=<unavailable>) at kern_exit.c:700 [opt]
frame #17: 0xffffff80262759c9 kernel.development`exit(p=<unavailable>, uap=<unavailable>, retval=<unavailable>) at kern_exit.c:683 [opt]
frame #18: 0xffffff80263a60ca kernel.development`unix_syscall64(state=<unavailable>) at systemcalls.c:382 [opt]
frame #19: 0xffffff8025d20a36 kernel.development`hndl_unix_scall64 + 22
* thread #12, name = '0xffffff803251b168', queue = '0x0', stop reason = breakpoint 10.1
* frame #0: 0xffffff80264115b6 kernel.development`IOService::scheduleTerminatePhase2(this=0xffffff803ccfc900, options=4) at IOService.cpp:2257 [opt]
frame #1: 0xffffff80264152b7 kernel.development`IOService::terminatePhase1(this=<unavailable>, options=4) at IOService.cpp:2212 [opt]
frame #2: 0xffffff7fa813a846 corecapture`CCPipe::removeCapture() + 44
frame #3: 0xffffff7fa813d2c7 corecapture`CCPipeUserClient::freeResources() + 41
frame #4: 0xffffff7fa814066f corecapture`CCDataPipeUserClient::clientDied() + 13
frame #5: 0xffffff8026469164 kernel.development`::iokit_client_died(obj=0xffffff80383fdd80, (null)=<unavailable>, type=<unavailable>, mscount=<unavailable>) at IOUserClient.cpp:586 [opt]
frame #6: 0xffffff8025e8427c kernel.development`iokit_notify at iokit_rpc.c:359 [opt]
frame #7: 0xffffff8025e8422e kernel.development`iokit_notify(msg=0xffffff803b974990) at iokit_rpc.c:385 [opt]
frame #8: 0xffffff8025d81d6f kernel.development`ipc_kobject_server(request=0xffffff803b974900, option=327681) at ipc_kobject.c:364 [opt]
frame #9: 0xffffff8025d54d0d kernel.development`ipc_kmsg_send(kmsg=0xffffff803b974900, option=327681, send_timeout=0) at ipc_kmsg.c:1867 [opt]
frame #10: 0xffffff8025d82500 kernel.development`mach_msg_send_from_kernel_proper(msg=<unavailable>, send_size=44) at ipc_mig.c:186 [opt]
frame #11: 0xffffff8025d63a13 kernel.development`ipc_right_dealloc [inlined] mach_notify_no_senders at mach_notify_user.c:370 [opt]
frame #12: 0xffffff8025d639d3 kernel.development`ipc_right_dealloc [inlined] ipc_notify_no_senders at ipc_notify.c:144 [opt]
frame #13: 0xffffff8025d639d3 kernel.development`ipc_right_dealloc(space=<unavailable>, name=8451, entry=<unavailable>) at ipc_right.c:994 [opt]
frame #14: 0xffffff8025d70723 kernel.development`mach_port_deallocate(space=0xffffff8042fb4ea0, name=8451) at mach_port.c:811 [opt]
frame #15: 0xffffff8025d6e434 kernel.development`_kernelrpc_mach_port_deallocate_trap(args=0xffffff90c8ddbf08) at mach_kernelrpc.c:198 [opt]
frame #16: 0xffffff8025ebe0ea kernel.development`mach_call_munger64(state=0xffffff8035aed220) at bsd_i386.c:573 [opt]
frame #17: 0xffffff8025d20a56 kernel.development`hndl_mach_scall64 + 22
Object's finalize is called from a termination thread.
* frame #0: 0xffffff8026414807 kernel.development`IOService::scheduleStop(IOService*) [inlined] IORegistryEntry::getRegistryEntryID() at IORegistryEntry.cpp:1755 [opt]
frame #1: 0xffffff8026414807 kernel.development`IOService::scheduleStop(this=0xffffff803c4832c0, provider=0xffffff8036422800) at IOService.cpp:2342 [opt]
frame #2: 0xffffff802640e8cc kernel.development`IOService::finalize(this=0xffffff803c4832c0, options=<unavailable>) at IOService.cpp:2853 [opt]
frame #3: 0xffffff802643bdce kernel.development`IOWorkLoop::runAction(this=0xffffff80314b8870, inAction=(kernel.development`IOService::actionFinalize(IOService*, unsigned int, void*, void*, void*) at IOService.cpp:2554), target=<unavailable>, arg0=<unavailable>, arg1=<unavailable>, arg2=<unavailable>, arg3=0x0000000000000000)(OSObject*, void*, void*, void*, void*), OSObject*, void*, void*, void*, void*) at IOWorkLoop.cpp:505 [opt]
frame #4: 0xffffff80264122d0 kernel.development`IOService::terminateWorker(unsigned int) [inlined] _workLoopAction(p3=<unavailable>)(OSObject*, void*, void*, void*, void*), IOService*, void*, void*, void*, void*) at IOService.cpp:2017 [opt]
frame #5: 0xffffff802641228b kernel.development`IOService::terminateWorker(options=1) at IOService.cpp:2730 [opt]
frame #6: 0xffffff802641c2f7 kernel.development`IOService::terminateThread(arg=0x0000000000000000, waitResult=<unavailable>) at IOService.cpp:2332 [opt]
frame #7: 0xffffff8025d1f5c7 kernel.development`call_continuation + 23
Object's stop is also scheduled to a termination thread.
* frame #0: 0xffffff802640f584 kernel.development`IOService::detach(this=0xffffff803ad4fe30, provider=0xffffff80368c0f40) at IOService.cpp:695 [opt]
frame #1: 0xffffff802643bdce kernel.development`IOWorkLoop::runAction(this=0xffffff80307679b0, inAction=(kernel.development`IOService::actionStop(IOService*, IOService*, void*, void*, void*) at IOService.cpp:2569), target=<unavailable>, arg0=<unavailable>, arg1=<unavailable>, arg2=<unavailable>, arg3=0x0000000000000000)(OSObject*, void*, void*, void*, void*), OSObject*, void*, void*, void*, void*) at IOWorkLoop.cpp:505 [opt]
frame #2: 0xffffff8026412635 kernel.development`IOService::terminateWorker(unsigned int) [inlined] _workLoopAction(p3=<unavailable>)(OSObject*, void*, void*, void*, void*), IOService*, void*, void*, void*, void*) at IOService.cpp:2017 [opt]
frame #3: 0xffffff80264125e7 kernel.development`IOService::terminateWorker(options=1) at IOService.cpp:2781 [opt]
frame #4: 0xffffff802641c2f7 kernel.development`IOService::terminateThread(arg=0x0000000000000000, waitResult=<unavailable>) at IOService.cpp:2332 [opt]
frame #5: 0xffffff8025d1f5c7 kernel.development`call_continuation + 23
An object is detached from stop in a termination thread. Some classes decide to detach in clientClose or clientDied.
* frame #0: 0xffffff802640f584 kernel.development`IOService::detach(this=0xffffff80382a5000, provider=0xffffff8036422800) at IOService.cpp:695 [opt]
frame #1: 0xffffff7fa7fdd746 IOAcceleratorFamily2`IOAccelCommandQueue::stopLocked() + 124
frame #2: 0xffffff7fa7fdd7a2 IOAcceleratorFamily2`IOAccelCommandQueue::stop(IOService*) + 76
frame #3: 0xffffff8026413442 kernel.development`IOService::actionStop(provider=0xffffff8036422800, client=0xffffff80382a5000, unused1=<unavailable>, unused2=<unavailable>, unused3=<unavailable>) at IOService.cpp:2581 [opt]
frame #4: 0xffffff802643bdce kernel.development`IOWorkLoop::runAction(this=0xffffff80314b8870, inAction=(kernel.development`IOService::actionStop(IOService*, IOService*, void*, void*, void*) at IOService.cpp:2569), target=<unavailable>, arg0=<unavailable>, arg1=<unavailable>, arg2=<unavailable>, arg3=0x0000000000000000)(OSObject*, void*, void*, void*, void*), OSObject*, void*, void*, void*, void*) at IOWorkLoop.cpp:505 [opt]
frame #5: 0xffffff8026412635 kernel.development`IOService::terminateWorker(unsigned int) [inlined] _workLoopAction(p3=<unavailable>)(OSObject*, void*, void*, void*, void*), IOService*, void*, void*, void*, void*) at IOService.cpp:2017 [opt]
frame #6: 0xffffff80264125e7 kernel.development`IOService::terminateWorker(options=1) at IOService.cpp:2781 [opt]
frame #7: 0xffffff802641c2f7 kernel.development`IOService::terminateThread(arg=0x0000000000000000, waitResult=<unavailable>) at IOService.cpp:2332 [opt]
frame #8: 0xffffff8025d1f5c7 kernel.development`call_continuation + 23