GNU bug report logs - #20471
Emacs ceased to respond to C-g on a tty; SIGINT became blocked?

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Package: emacs; Reported by: Ivan Shmakov <ivan@HIDDEN>; dated Thu, 30 Apr 2015 15:31:05 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Removed tag(s) moreinfo. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Added tag(s) moreinfo. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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 for 20471 <at> debbugs.gnu.org; Mon, 04 May 2015 23:20:27 +0700
From: Ivan Shmakov <ivan@HIDDEN>
To: 20471 <at> debbugs.gnu.org
Subject: Re: bug#20471: Emacs ceased to respond to C-g on a tty;
 SIGINT became blocked? 
References: <87bni5pra9.fsf@HIDDEN> <87h9rxhaii.fsf@HIDDEN>
 <87fv7cmj5n.fsf@HIDDEN> <83zj5ks4sc.fsf@HIDDEN>
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>>>>> Eli Zaretskii <eliz@HIDDEN> writes:
>>>>> From: Ivan Shmakov  Date: Mon, 04 May 2015 15:55:48 +0000
>>>>> Andreas Schwab <schwab@HIDDEN> writes:

[=E2=80=A6]

 >>> A blocked signal would still be visible in the debugger

 >> It=E2=80=99s not what I observe.  Why, SIGINT seem to be ignored by GDB
 >> itself when it=E2=80=99s attached to that Emacs instance.

 >>> (assuming you haven't changed the handling of SIGINT in gdb).

 > Is this on a TTY frame?

	Yes.  FWIW, I use non-tty Emacs frames only occasionally.

 > If not, then C-g doesn't trigger a SIGINT in Emacs.

	Yes.  (I=E2=80=99ve already read that part in keyboard.c.)

PS.  GNU Screen is just so welcoming an environment I can=E2=80=99t give it=
 up
	easily.

--=20
FSF associate member #7257  http://am-1.org/~ivan/      =E2=80=A6 3013 B6A0=
 230E 334A
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#20471; Package emacs. Full text available.

Message received at 20471 <at> debbugs.gnu.org:


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Date: Mon, 04 May 2015 19:09:39 +0300
From: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#20471: Emacs ceased to respond to C-g on a tty;
 SIGINT became blocked?
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> From: Ivan Shmakov <ivan@HIDDEN>
> Date: Mon, 04 May 2015 15:55:48 +0000
> 
> >>>>> Andreas Schwab <schwab@HIDDEN> writes:
> >>>>> Ivan Shmakov <ivan@HIDDEN> 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).

Is this on a TTY frame?  If not, then C-g doesn't trigger a SIGINT in
Emacs.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#20471; Package emacs. Full text available.

Message received at 20471 <at> debbugs.gnu.org:


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From: Ivan Shmakov <ivan@HIDDEN>
To: 20471 <at> debbugs.gnu.org
Subject: Re: bug#20471: Emacs ceased to respond to C-g on a tty;
 SIGINT became blocked? 
References: <87bni5pra9.fsf@HIDDEN> <87h9rxhaii.fsf@HIDDEN>
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>>>>> Andreas Schwab <schwab@HIDDEN> writes:
>>>>> Ivan Shmakov <ivan@HIDDEN> writes:

 >> Attaching GDB to it shows no signals being delivered on C-g, which
 >> (AIUI) hints at either SIGINT being blocked /or/ C-g =E2=80=9Cunbound=
=E2=80=9D from
 >> the signal via terminal settings.  I=E2=80=99ve 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=E2=80=99s not what I observe.  Why, SIGINT seem to be ignored by GDB
	itself when it=E2=80=99s attached to that Emacs instance.

 > (assuming you haven't changed the handling of SIGINT in gdb).

	I didn=E2=80=99t.

(gdb) info signals=20
Signal        Stop      Print   Pass to program Description

SIGHUP        Yes       Yes     Yes             Hangup
SIGINT        Yes       Yes     No              Interrupt
SIGQUIT       Yes       Yes     Yes             Quit
=E2=80=A6

	Just in case, the ps(1) output for two of my Emacs instances
	goes below.  The GDB =E2=80=98bt=E2=80=99 output at SIGCONT time (after a
	properly handled C-z) is MIMEd, too.

	To note is that I=E2=80=99ve tried to set a breakpoint on the next line
	of internal_catch (), but it doesn=E2=80=99t 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=20
  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
$=20

--=20
FSF associate member #7257  http://am-1.org/~ivan/      =E2=80=A6 3013 B6A0=
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--=-=-=--
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#20471; Package emacs. Full text available.

Message received at 20471 <at> debbugs.gnu.org:


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From: Andreas Schwab <schwab@HIDDEN>
To: Ivan Shmakov <ivan@HIDDEN>
Subject: Re: bug#20471: Emacs ceased to respond to C-g on a tty;
 SIGINT became blocked?
References: <87bni5pra9.fsf@HIDDEN>
X-Yow: I know th'MAMBO!!  I have a TWO-TONE CHEMISTRY SET!!
Date: Thu, 30 Apr 2015 18:00:05 +0200
In-Reply-To: <87bni5pra9.fsf@HIDDEN> (Ivan Shmakov's message of
 "Thu, 30 Apr 2015 15:30:38 +0000")
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Ivan Shmakov <ivan@HIDDEN> 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.

A blocked signal would still be visible in the debugger (assuming you
haven't changed the handling of SIGINT in gdb).

Andreas.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#20471; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Ivan Shmakov <ivan@HIDDEN>
To: submit <at> debbugs.gnu.org
Subject: Emacs ceased to respond to C-g on a tty; SIGINT became blocked? 
Date: Thu, 30 Apr 2015 15:30:38 +0000
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Package: emacs

	After some unfortunate interaction with a process (or perhaps a
	network connection), one of my Emacs instances (built from Git;
	1c7f0cdc4c1f, 2015-04-27 16:59:11 UTC) ceased to respond to C-g
	on a tty.

	Attaching GDB to it shows no signals being delivered on C-g,
	which (AIUI) hints at either SIGINT being blocked /or/ C-g
	=E2=80=9Cunbound=E2=80=9D from the signal via terminal settings.  I=E2=80=
=99ve 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.

$ stty -F /dev/pts/non-working "$(stty -gF /dev/pts/working)"=20

	Any suggestion on how do I debug this issue any further?

	TIA.

--=20
FSF associate member #7257  np. Dance of Death =E2=80=94 Iron Maiden =E2=80=
=A6 B6A0 230E 334A
Acknowledgement sent to Ivan Shmakov <ivan@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#20471; Package emacs. Full text available.
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