[Qemu-devel] [Bug 1675108] Re: Cocoa UI always crashes on startup

[Brendan Shanks]

Tested on 10.12.3, it doesn't crash immediately (like before) but
crashes reliably once I send some keyboard input to qemu:

$ i386-softmmu/qemu-system-i386 
**
ERROR:/Users/pip/no_backup/qemu/translate-common.c:34:tcg_handle_interrupt: 
assertion failed: (qemu_mutex_iothread_locked())
Abort trap: 6


Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib              0x00007fffa746edd6 __pthread_kill + 10
1   libsystem_pthread.dylib             0x00007fffa755a787 pthread_kill + 90
2   libsystem_c.dylib                   0x00007fffa73d4420 abort + 129
3   libglib-2.0.0.dylib                 0x00000001076aec86 g_assertion_message 
+ 388
4   libglib-2.0.0.dylib                 0x00000001076aece4 
g_assertion_message_expr + 94
5   qemu-system-i386                    0x00000001066bb1ec tcg_handle_interrupt 
+ 156 (translate-common.c:50)
6   qemu-system-i386                    0x0000000106740dfc pic_irq_request + 
156 (pc.c:187)
7   qemu-system-i386                    0x000000010673e5e4 gsi_handler + 36 
(pc.c:115)
8   qemu-system-i386                    0x000000010685e97a kbd_update_kbd_irq + 
138 (pckbd.c:180)
9   qemu-system-i386                    0x000000010694164a 
qemu_input_event_send_impl + 938 (input.c:328)
10  qemu-system-i386                    0x000000010694188f 
qemu_input_event_send_key + 239 (input.c:359)
11  qemu-system-i386                    0x0000000106946a00 cocoa_refresh + 272 
(cocoa.m:1402)
12  qemu-system-i386                    0x000000010693f6a8 gui_update + 104 
(console.c:1603)

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https://bugs.launchpad.net/bugs/1675108

Title:
  Cocoa UI always crashes on startup

Status in QEMU:
  New

Bug description:
  Commit 8bb93c6f99a42c2e0943bc904b283cd622d302c5 ("ui/console: ensure
  graphic updates don't race with TCG vCPUs") causes the graphic update
  to run on a non-main thread, which Cocoa is not happy with. It crashes
  immediately after startup.

  $ i386-softmmu/qemu-system-i386 
  2017-03-22 10:09:25.113 qemu-system-i386[15968:9538245] *** Terminating app 
due to uncaught exception 'NSInternalInconsistencyException', reason: 
'nextEventMatchingMask should only be called from the Main Thread!'
  *** First throw call stack:
  (
        0   CoreFoundation                      0x00007fff91e72e7b 
__exceptionPreprocess + 171
        1   libobjc.A.dylib                     0x00007fffa6a5ccad 
objc_exception_throw + 48
        2   AppKit                              0x00007fff900953fd 
-[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] 
+ 4471
        3   qemu-system-i386                    0x0000000104f75a49 
cocoa_refresh + 233
        4   qemu-system-i386                    0x0000000104e0312c 
process_queued_cpu_work + 140
        5   qemu-system-i386                    0x0000000104d1a73c 
qemu_tcg_rr_cpu_thread_fn + 284
        6   libsystem_pthread.dylib             0x00007fffa7557aab 
_pthread_body + 180
        7   libsystem_pthread.dylib             0x00007fffa75579f7 
_pthread_body + 0
        8   libsystem_pthread.dylib             0x00007fffa75571fd thread_start 
+ 13
  )
  libc++abi.dylib: terminating with uncaught exception of type NSException
  Abort trap: 6

  System: macOS 10.12.3, Xcode 8.2.1

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