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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 14:58:11 -0800 |
lldb "thread continue" runs after, but emacs remains unresponsive
'thread step-in" does increment the instruction counter (output
below)...but not really sure what that implies.
(lldb) thread step-in
Process 25251 stopped
* thread #1: tid = 0x746f0, 0x00007fff8a861168
libsystem_kernel.dylib`__psynch_mutexwait + 12, queue =
'com.apple.main-thread', stop reason = instruction step into
frame #0: 0x00007fff8a861168 libsystem_kernel.dylib`__psynch_mutexwait + 12
libsystem_kernel.dylib`__psynch_mutexwait:
-> 0x7fff8a861168 <+12>: movq %rax, %rdi
0x7fff8a86116b <+15>: jmp 0x7fff8a85cc53 ; cerror_nocancel
0x7fff8a861170 <+20>: retq
0x7fff8a861171 <+21>: nop
(lldb) thread step-in
Process 25251 stopped
* thread #1: tid = 0x746f0, 0x00007fff8a86116b
libsystem_kernel.dylib`__psynch_mutexwait + 15, queue =
'com.apple.main-thread', stop reason = instruction step into
frame #0: 0x00007fff8a86116b libsystem_kernel.dylib`__psynch_mutexwait + 15
libsystem_kernel.dylib`__psynch_mutexwait:
-> 0x7fff8a86116b <+15>: jmp 0x7fff8a85cc53 ; cerror_nocancel
0x7fff8a861170 <+20>: retq
0x7fff8a861171 <+21>: nop
0x7fff8a861172 <+22>: nop
(lldb) thread step-in
Process 25251 stopped
* thread #1: tid = 0x746f0, 0x00007fff8a85cc53
libsystem_kernel.dylib`cerror_nocancel, queue =
'com.apple.main-thread', stop reason = instruction step into
frame #0: 0x00007fff8a85cc53 libsystem_kernel.dylib`cerror_nocancel
libsystem_kernel.dylib`cerror_nocancel:
-> 0x7fff8a85cc53 <+0>: movl %edi, -0x14ad19d9(%rip) ; errno
0x7fff8a85cc59 <+6>: movq %gs:0x8, %rax
0x7fff8a85cc62 <+15>: testq %rax, %rax
0x7fff8a85cc65 <+18>: je 0x7fff8a85cc69 ; <+22>
On Tue, Nov 24, 2015 at 2:51 PM, Maneesh Yadav <maneeshkyadav@gmail.com> wrote:
> 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, 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, 2015/11/24
- bug#21965: 24.5; Emacs freezes when canceling at open file,
Maneesh Yadav <=
- 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