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bug#20471: Emacs ceased to respond to C-g on a tty; SIGINT became blocke
From: |
Ivan Shmakov |
Subject: |
bug#20471: Emacs ceased to respond to C-g on a tty; SIGINT became blocked? |
Date: |
Mon, 04 May 2015 15:55:48 +0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) |
>>>>> Andreas Schwab <schwab@linux-m68k.org> writes:
>>>>> Ivan Shmakov <ivan@siamics.net> writes:
>> Attaching GDB to it shows no signals being delivered on C-g, which
>> (AIUI) hints at either SIGINT being blocked /or/ C-g “unbound” from
>> the signal via terminal settings. I’ve copied the latter from a
>> terminal used by a properly working Emacs instance with the stty(1)
>> invocation below, yet I still see no signals via GDB, which leaves
>> the signal mask as the only point of failure that I can think of.
>> Any suggestion on how do I debug this issue any further?
> A blocked signal would still be visible in the debugger
It’s not what I observe. Why, SIGINT seem to be ignored by GDB
itself when it’s attached to that Emacs instance.
> (assuming you haven't changed the handling of SIGINT in gdb).
I didn’t.
(gdb) info signals
Signal Stop Print Pass to program Description
SIGHUP Yes Yes Yes Hangup
SIGINT Yes Yes No Interrupt
SIGQUIT Yes Yes Yes Quit
…
Just in case, the ps(1) output for two of my Emacs instances
goes below. The GDB ‘bt’ output at SIGCONT time (after a
properly handled C-z) is MIMEd, too.
To note is that I’ve tried to set a breakpoint on the next line
of internal_catch (), but it doesn’t seem to ever be triggered.
Could it hint at some non-local exit issue, perhaps?
$ ps -o pid,pending,blocked,ignored,caught,stat,bsdtime,command \
-C emacs24 -C emacs25
PID PENDING BLOCKED IGNORED CAUGHT STAT TIME COMMAND
19987 00000000 00000000 14001000 <cb816eff S+ 843:01 emacs24
25806 00000002 04002006 04001000 <db816eff Sl+ 52:00 emacs25
$
--
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- bug#20471: Emacs ceased to respond to C-g on a tty; SIGINT became blocked?,
Ivan Shmakov <=