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bug#21965: 24.5; Emacs freezes when canceling at open file
From: |
Maneesh Yadav |
Subject: |
bug#21965: 24.5; Emacs freezes when canceling at open file |
Date: |
Tue, 24 Nov 2015 14:51:57 -0800 |
FWIW I just triggered the condition 3 times in a row (I seem to be
getting better at triggering it), attached with lldb output
(backtraces looks the same as before as well). Looks like the same
instruction?
#1
Process 25176 stopped
* thread #1: tid = 0x7369a, 0x00007fff8a861166
libsystem_kernel.dylib`__psynch_mutexwait + 10, queue =
'com.apple.main-thread', stop reason = signal SIGSTOP
frame #0: 0x00007fff8a861166 libsystem_kernel.dylib`__psynch_mutexwait + 10
libsystem_kernel.dylib`__psynch_mutexwait:
-> 0x7fff8a861166 <+10>: jae 0x7fff8a861170 ; <+20>
0x7fff8a861168 <+12>: movq %rax, %rdi
0x7fff8a86116b <+15>: jmp 0x7fff8a85cc53 ; cerror_nocancel
0x7fff8a861170 <+20>: retq
(lldb) thread backtrace
* thread #1: tid = 0x7369a, 0x00007fff8a861166
libsystem_kernel.dylib`__psynch_mutexwait + 10, queue =
'com.apple.main-thread', stop reason = signal SIGSTOP
* frame #0: 0x00007fff8a861166 libsystem_kernel.dylib`__psynch_mutexwait + 10
frame #1: 0x00007fff853b5696
libsystem_pthread.dylib`_pthread_mutex_lock + 480
frame #2: 0x0000000100a17ba1 libglib-2.0.0.dylib`g_mutex_lock + 26
frame #3: 0x00000001009db284 libglib-2.0.0.dylib`g_main_context_acquire + 42
frame #4: 0x000000010024fc47 emacs`xg_select + 231
...
#2
Process 25238 stopped
* thread #1: tid = 0x742be, 0x00007fff8a861166
libsystem_kernel.dylib`__psynch_mutexwait + 10, queue =
'com.apple.main-thread', stop reason = signal SIGSTOP
frame #0: 0x00007fff8a861166 libsystem_kernel.dylib`__psynch_mutexwait + 10
libsystem_kernel.dylib`__psynch_mutexwait:
-> 0x7fff8a861166 <+10>: jae 0x7fff8a861170 ; <+20>
0x7fff8a861168 <+12>: movq %rax, %rdi
0x7fff8a86116b <+15>: jmp 0x7fff8a85cc53 ; cerror_nocancel
0x7fff8a861170 <+20>: retq
#3
Process 25251 stopped
* thread #1: tid = 0x746f0, 0x00007fff8a861166
libsystem_kernel.dylib`__psynch_mutexwait + 10, queue =
'com.apple.main-thread', stop reason = signal SIGSTOP
frame #0: 0x00007fff8a861166 libsystem_kernel.dylib`__psynch_mutexwait + 10
libsystem_kernel.dylib`__psynch_mutexwait:
-> 0x7fff8a861166 <+10>: jae 0x7fff8a861170 ; <+20>
0x7fff8a861168 <+12>: movq %rax, %rdi
0x7fff8a86116b <+15>: jmp 0x7fff8a85cc53 ; cerror_nocancel
0x7fff8a861170 <+20>: retq
On Mon, Nov 23, 2015 at 7:39 PM, John Wiegley <jwiegley@gmail.com> wrote:
>>>>>> Eli Zaretskii <eliz@gnu.org> writes:
>
>> No. And I'm not even convinced that's where we are blocked. It could be that
>> this is part of a loop that Emacs is waiting in. To prove that we are
>> blocked there, one needs to attach the debugger many times and see that the
>> debugger finds Emacs at _exactly_ the same instruction. Or, after attaching,
>> step Emacs and see that it cannot move even a single instructions.
>
> Fair enough. The docs for g_main_context_acquire do say that it should return
> immediately, if no other thread is holding the lock.
>
> John
- bug#21965: 24.5; Emacs freezes when canceling at open file, (continued)
- bug#21965: 24.5; Emacs freezes when canceling at open file, Maneesh Yadav, 2015/11/20
- bug#21965: 24.5; Emacs freezes when canceling at open file, Eli Zaretskii, 2015/11/21
- bug#21965: 24.5; Emacs freezes when canceling at open file, John Wiegley, 2015/11/22
- bug#21965: 24.5; Emacs freezes when canceling at open file, Maneesh Yadav, 2015/11/22
- bug#21965: 24.5; Emacs freezes when canceling at open file, Maneesh Yadav, 2015/11/23
- bug#21965: 24.5; Emacs freezes when canceling at open file, John Wiegley, 2015/11/23
- bug#21965: 24.5; Emacs freezes when canceling at open file, Maneesh Yadav, 2015/11/23
- bug#21965: 24.5; Emacs freezes when canceling at open file, Eli Zaretskii, 2015/11/23
- bug#21965: 24.5; Emacs freezes when canceling at open file, Eli Zaretskii, 2015/11/23
- bug#21965: 24.5; Emacs freezes when canceling at open file, John Wiegley, 2015/11/23
- bug#21965: 24.5; Emacs freezes when canceling at open file,
Maneesh Yadav <=
- bug#21965: 24.5; Emacs freezes when canceling at open file, Maneesh Yadav, 2015/11/24
- bug#21965: 24.5; Emacs freezes when canceling at open file, John Wiegley, 2015/11/24
- bug#21965: 24.5; Emacs freezes when canceling at open file, Maneesh Yadav, 2015/11/24
- bug#21965: 24.5; Emacs freezes when canceling at open file, John Wiegley, 2015/11/24
- bug#21965: 24.5; Emacs freezes when canceling at open file, Maneesh Yadav, 2015/11/24
- bug#21965: 24.5; Emacs freezes when canceling at open file, John Wiegley, 2015/11/24
- bug#21965: 24.5; Emacs freezes when canceling at open file, Maneesh Yadav, 2015/11/25
- bug#21965: 24.5; Emacs freezes when canceling at open file, John Wiegley, 2015/11/25
bug#21965: 24.5; Emacs freezes when canceling at open file, Eli Zaretskii, 2015/11/20