DMARC-Filter: OpenDMARC Filter v1.4.2 delorie.com 51SCKrtp1193122 Authentication-Results: delorie.com; dmarc=pass (p=none dis=none) header.from=cygwin.com Authentication-Results: delorie.com; spf=pass smtp.mailfrom=cygwin.com DKIM-Filter: OpenDKIM Filter v2.11.0 delorie.com 51SCKrtp1193122 Authentication-Results: delorie.com; dkim=pass (1024-bit key, unprotected) header.d=cygwin.com header.i=@cygwin.com header.a=rsa-sha256 header.s=default header.b=YhBpG1KY X-Recipient: archive-cygwin AT delorie DOT com DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A62B7385840C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com; s=default; t=1740745250; bh=8C9107KYGjZGiF0HfRertiNRJNm7KhOMWGMgfde24z8=; h=Date:To:Subject:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=YhBpG1KYFRVmmLeWvlAGibf4mJT1ozk4OXEKJzVfTBNT82wOMimmGl16E7StEPvh7 0Ii2sZ4K0Wcf0Z77qMNNw9CvTMePGdQm/slli2rznBXK2gsjuheQi67x3A9IHFYLHP XagSSwCISnq9c2mJoF6fdkpKIRBIOGhjhEb/IR8o= X-Original-To: cygwin AT cygwin DOT com Delivered-To: cygwin AT cygwin DOT com DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 34E773858C56 ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 34E773858C56 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1740745225; cv=none; b=RtXviT3EWP0zSeFhvYYrY915lTXnGdUe4UYhabTw6d7eheKXUrHlOXZ9ZyiPm/Eb8dhebcRaV1w/OC/A+yI6VpHlNEOawGe2gSKEUaM8Vvjta3H9Kv9E8jRsfP+1cY2o4RPFumj+UKRwc0a6ERqVWcDub21J9FRPR0j+ZfDuavc= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1740745225; c=relaxed/simple; bh=/IVydIHLKB5isutgI41ahAOwwyVdGy7CfHg3FnWsOtQ=; h=Date:From:To:Subject:Message-Id:Mime-Version:DKIM-Signature; b=FfR4c9/i16iOc/XB9G0oS1BYT1rWeaIZ94ncZB/4N54HUuHXB3GLmNDGIGYs5bTbT0pHGOfKtgtVVnGVaJ4rECJ/bxN6p8Ajg8TZdxU1EZa4qi7Fk9rkqFYBaTDWarld9KRvU0Bseq1eJwpJb3XM72QGbnd6VH5v2PUDF3yiZDk= ARC-Authentication-Results: i=1; server2.sourceware.org DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 34E773858C56 Date: Fri, 28 Feb 2025 21:20:20 +0900 To: cygwin AT cygwin DOT com Subject: Re: cygwin 3.6.0: Signals may fail permanently if received after SIGSTOP Message-Id: <20250228212020.433a339f073060f65a0a736d@nifty.ne.jp> In-Reply-To: <8c465025-4858-3113-fe2d-ce00dad21f8a@t-online.de> References: <8c465025-4858-3113-fe2d-ce00dad21f8a AT t-online DOT de> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.30; i686-pc-mingw32) Mime-Version: 1.0 X-BeenThere: cygwin AT cygwin DOT com X-Mailman-Version: 2.1.30 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Takashi Yano via Cygwin Reply-To: Takashi Yano Content-Type: text/plain; charset="utf-8" Errors-To: cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com Sender: "Cygwin" Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by delorie.com id 51SCKrtp1193122 On Mon, 24 Feb 2025 11:29:59 +0100 Christian Franke wrote: > Found with 'stress-ng --cpu-sched 1': > > Testcase (attached): > > $ uname -r > 3.6.0-0.387.g8cebbb2b42bf.x86_64 > > $ gcc -o timersig timersig.c > > $ ./timersig > 638: fork()=639 > !!!!!!!!!!!!!...!!!!!!!!!!!!!SIGSTOP: Permission denied >     0 [itimer] timersig 639 sig_send: error sending signal 14, pid 639, > pipe handle 0x14C, nb 0, packsize 192, Win32 error 0 > SIGKILL: Permission denied > > $ kill 639 > -bash: kill: (639) - Permission denied > > $ kill -9 639 > -bash: kill: (639) - Permission denied > > $ /bin/kill --force 639 > > $ /bin/kill --force 639 > kill: 639: No such process > > > A similar problem, but without the "error sending signal" message, > occurs if the timer is not used but the parent process issues SIGSTOP > SIGALRM SIGCONT ... sequences. Thanks for the report, especially for the test case. I was able to easily reproduce the issue. However, I haven't found the cause until today. I spent 3 days investigating and discovered three bugs that prevent the test case from behaving as expected. I'll submit the patch seriese shotly. -- Takashi Yano -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple