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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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Date: Mon, 04 May 2015 15:55:48 +0000
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Apr 2015 18:00:05 +0200")
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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=
230E 334A
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--=-=-=--
bug-gnu-emacs@HIDDEN:bug#20471; Package emacs.
Full text available.Received: (at 20471) by debbugs.gnu.org; 30 Apr 2015 16:00:23 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Apr 30 12:00:23 2015 Received: from localhost ([127.0.0.1]:57736 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1Ynqsv-0003YB-Vk for submit <at> debbugs.gnu.org; Thu, 30 Apr 2015 12:00:23 -0400 Received: from mail-out.m-online.net ([212.18.0.9]:50712) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <whitebox@HIDDEN>) id 1Ynqsq-0003XV-TK for 20471 <at> debbugs.gnu.org; Thu, 30 Apr 2015 12:00:18 -0400 Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 3ld1d54C0Cz3hjZd; Thu, 30 Apr 2015 18:00:09 +0200 (CEST) Received: from localhost (dynscan1.mnet-online.de [192.168.6.68]) by mail.m-online.net (Postfix) with ESMTP id 3ld1d52M4tzvh24; Thu, 30 Apr 2015 18:00:09 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.68]) (amavisd-new, port 10024) with ESMTP id wwYCuWJMIFZt; Thu, 30 Apr 2015 18:00:05 +0200 (CEST) X-Auth-Info: lQfUrKxHts+z9AWWPkCI1UVw5+lKknIn4ce87Dqwj7Rz9hRk+fekSl0dFayVINZZ Received: from igel.home (ppp-93-104-94-204.dynamic.mnet-online.de [93.104.94.204]) by mail.mnet-online.de (Postfix) with ESMTPA; Thu, 30 Apr 2015 18:00:05 +0200 (CEST) Received: by igel.home (Postfix, from userid 1000) id 264232C30C5; Thu, 30 Apr 2015 18:00:05 +0200 (CEST) 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") Message-ID: <87h9rxhaii.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -0.7 (/) X-Debbugs-Envelope-To: 20471 Cc: 20471 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.7 (/) 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."
bug-gnu-emacs@HIDDEN:bug#20471; Package emacs.
Full text available.Received: (at submit) by debbugs.gnu.org; 30 Apr 2015 15:31:03 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Apr 30 11:31:03 2015 Received: from localhost ([127.0.0.1]:57716 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1YnqQU-0001MI-3g for submit <at> debbugs.gnu.org; Thu, 30 Apr 2015 11:31:02 -0400 Received: from fely.am-1.org ([78.47.74.50]:41910) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <ivan@HIDDEN>) id 1YnqQN-0001Ly-2x for submit <at> debbugs.gnu.org; Thu, 30 Apr 2015 11:30:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=siamics.net; s=a2013295; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Message-ID:Date:Sender:Subject:To:From; bh=ueqmSY4IqebJO0ViU+a4vuUnHqKb+6RoBh3AVqxMRS0=; b=dKr8coIkUL7eBtA7rfIQPRvk+c9RmeC5qT5TgpoBKrPwIjItrhyRTMUtcEGbzMuLnDdYD3rgvNuSvYO55CdpdnkpaFGNuUoj051tvyQKZKYQelh4Ua6SHzGtW1TO61pJQ42OZjgKoHvvrIoPVi5Et/ePgW32bsWO5ZKS9Ced4vE=; Received: from [2a02:2560:6d4:26ca::1:1d] (helo=violet.siamics.net) by fely.am-1.org with esmtps (TLS1.2:DHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from <ivan@HIDDEN>) id 1YnqQK-0004Ca-QW for submit <at> debbugs.gnu.org; Thu, 30 Apr 2015 15:30:48 +0000 Received: from localhost ([::1] helo=violet.siamics.net) by violet.siamics.net with esmtps (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from <ivan@HIDDEN>) id 1YnqQB-0000u9-58 for submit <at> debbugs.gnu.org; Thu, 30 Apr 2015 22:30:39 +0700 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 Message-ID: <87bni5pra9.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.7 (/) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: 0.7 (/) 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
Ivan Shmakov <ivan@HIDDEN>:bug-gnu-emacs@HIDDEN.
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