bug#48629: 28.0.50; GUI emacsclient frames stop accepting keyboard input around recv

["Basil L. Contovounesios" <contovob@tcd.ie>]

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"Basil L. Contovounesios" <contovob@tcd.ie> writes:

> I then entered 'n' a few times followed unfortunately by C-c, which
> killed the process (I would have tried 'thread apply all bt full' next).
>
> So it looks like it's actually pselect that's blocking?

It happened again, with the attached 'thread apply all bt full' output.

I'll try to keep the session alive this time, in case anyone has any
debugging suggestions.

Thanks,

-- 
Basil


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$ gdb -p 46955
GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git
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Attaching to process 46955
[New LWP 46956]
[New LWP 46957]
[New LWP 46958]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007fb2fa7ae9c6 in __pselect (nfds=24, readfds=0x7ffc492342e0, writefds=0x7ffc49234360, exceptfds=0x0,
    timeout=<optimized out>, sigmask=0x7ffc49234130) at ../sysdeps/unix/sysv/linux/pselect.c:48
48      ../sysdeps/unix/sysv/linux/pselect.c: No such file or directory.
(gdb) set logging on
Copying output to gdb.txt.
Copying debug output to gdb.txt.
(gdb) thread apply all bt full

Thread 4 (Thread 0x7fb2f5b5a700 (LWP 46958) "gdbus"):
#0  0x00007fb2fa7ac3ff in __GI___poll (fds=0x7fb2e8016990, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1  0x00007fb2fb4ad0ae in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb2fb4ad40b in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb2fb727a36 in  () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fb2fb4d60bd in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb2faa3dea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
        ret = <optimized out>
        pd = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140406603228928, 6863267776147330063, 140406611616302, 140406611616303, 140406603224768, 8396800, -6891964528408030193, -6891970972744707057}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#6  0x00007fb2fa7b6def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fb2f635b700 (LWP 46957) "dconf worker"):
#0  0x00007fb2fa7ac3ff in __GI___poll (fds=0x55dfc862dac0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1  0x00007fb2fb4ad0ae in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb2fb4ad1cf in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb2f636a38d in  () at /usr/lib/x86_64-linux-gnu/gio/modules/libdconfsettings.so
#4  0x00007fb2fb4d60bd in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb2faa3dea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
        ret = <optimized out>
        pd = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140406611621632, 6863267776147330063, 140721535523102, 140721535523103, 140406611617472, 8396800, -6891961230410017777, -6891970972744707057}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#6  0x00007fb2fa7b6def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fb2f6b94700 (LWP 46956) "gmain"):
#0  0x00007fb2fa7ac3ff in __GI___poll (fds=0x55dfc72bdf30, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
        resultvar = 18446744073709551100
        sc_cancel_oldtype = 0
#1  0x00007fb2fb4ad0ae in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fb2fb4ad1cf in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fb2fb4ad221 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fb2fb4d60bd in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fb2faa3dea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
        ret = <optimized out>
        pd = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140406620243712, 6863267776147330063, 140721535537518, 140721535537519, 140406620239552, 8396800, -6891962223084334065, -6891970972744707057}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = 0
#6  0x00007fb2fa7b6def in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fb2f78e9040 (LWP 46955) "emacs"):
#0  0x00007fb2fa7ae9c6 in __pselect (nfds=24, readfds=0x7ffc492342e0, writefds=0x7ffc49234360, exceptfds=0x0, timeout=<optimized out>, sigmask=0x7ffc49234130) at ../sysdeps/unix/sysv/linux/pselect.c:48
        resultvar = 18446744073709551102
        sc_cancel_oldtype = 0
        tval = {tv_sec = 14, tv_nsec = 461936780}
        data = {ss = 0, ss_len = 8}
#1  0x000055dfc63615b6 in really_call_select ()
#2  0x000055dfc6362320 in thread_select ()
#3  0x000055dfc637ef58 in xg_select ()
#4  0x000055dfc633f89d in wait_reading_process_output ()
#5  0x000055dfc62843e8 in read_char ()
#6  0x000055dfc6286822 in read_key_sequence ()
#7  0x000055dfc628822c in command_loop_1 ()
#8  0x000055dfc62f63d7 in internal_condition_case ()
#9  0x000055dfc62793e4 in command_loop_2 ()
#10 0x000055dfc62f89d3 in internal_catch ()
#11 0x000055dfc6279383 in command_loop ()
#12 0x000055dfc627e976 in recursive_edit_1 ()
#13 0x000055dfc627eca1 in Frecursive_edit ()
#14 0x000055dfc619409e in main ()