Okay, PID 578 is the hanging attaching tmux clients. Here is the backtrace
for the original tmux server.
(gdb) bt
#0 0x00007f8696181950 in __write_nocancel () at
../sysdeps/unix/syscall-template.S:82
#1 0x000000000042d1c0 in tty_stop_tty (tty=tty@entry=0xe12c68) at tty.c:242
#2 0x000000000042d35c in tty_close (tty=tty@entry=0xe12c68) at tty.c:272
#3 0x0000000000423490 in server_client_msg_dispatch (c=0xe02b60) at
server-client.c:776
#4 0x000000000042372d in server_client_callback (fd=22, events=2,
data=0x7) at server-client.c:213
#5 0x00007f86968850c2 in event_process_active_single_queue
(activeq=<optimized out>, base=<optimized out>) at event.c:1340
#6 event_process_active (base=<optimized out>) at event.c:1407
#7 event_base_loop (base=<optimized out>, flags=flags@entry=1) at
event.c:1604
#8 0x00007f8696886131 in event_loop (flags=flags@entry=1) at event.c:1518
#9 0x0000000000424f2a in server_loop () at server.c:210
#10 0x000000000042549f in server_start () at server.c:201
#11 0x0000000000404829 in client_connect (path=0x66fc80
"/tmp//tmux-0/default", start_server=1) at client.c:80
#12 0x0000000000404ca9 in client_main (argc=argc@entry=0,
argv=argv@entry=0x7fff03c09050,
flags=flags@entry=1) at client.c:152
#13 0x0000000000403537 in main (argc=0, argv=0x7fff03c09050) at tmux.c:406
On Wed, Dec 19, 2012 at 7:39 PM, Guang-Nan Cheng <chen...@gmail.com> wrote:
> Thanks for the tip. It seems related with epoll_wait. I have no idea what
> it is.
>
>
> > strace -p 578
> Process 578 attached
> *epoll_wait(3, *
>
> > gdb
> Missing separate debuginfos, use: debuginfo-install tmux-1.6-1.fc17.x86_64
> (gdb) bt
> *#0 0x00007f18e7b9dc53 in __epoll_wait_nocancel () from /lib64/libc.so.6*
> #1 0x00007f18e82a8223 in ?? () from /lib64/libevent-2.0.so.5
> #2 0x00007f18e8293e00 in event_base_loop () from /lib64/libevent-2.0.so.5
> #3 0x0000000000404d20 in ?? ()
> #4 0x0000000000403537 in ?? ()
> #5 0x00007f18e7acd735 in __libc_start_main () from /lib64/libc.so.6
> #6 0x000000000040374d in ?? ()
> #7 0x00007fff70392898 in ?? ()
> #8 0x000000000000001c in ?? ()
> #9 0x0000000000000002 in ?? ()
> #10 0x00007fff70393bd2 in ?? ()
> #11 0x00007fff70393bd7 in ?? ()
> #12 0x0000000000000000 in ?? ()
>
> On Wed, Dec 19, 2012 at 12:59 AM, Thomas Adam <tho...@xteddy.org> wrote:
>
>> On 18 December 2012 16:11, Guang-Nan Cheng <chen...@gmail.com> wrote:
>> > It happend again. This time, I don't even have a .tmux.conf file.
>> >
>> > Is there any trick so that I can send a signal to the PID and tmux will
>> > print the stack so we know why it hangs?
>>
>> Attach strace to the server pid of tmux. Or better yet, gdb, and
>> issue "bt" to see if that helps any.
>>
>> -- Thomas Adam
>>
>
>
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