Path: csiph.com!optima2.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!usenet.stanford.edu!not-for-mail From: Chet Ramey Newsgroups: gnu.bash.bug Subject: Re: Race condition in read -t Date: Mon, 31 Aug 2015 09:25:33 -0400 Lines: 21 Approved: bug-bash@gnu.org Message-ID: References: <20150828235248.GA21479@thinkpad> Reply-To: chet.ramey@case.edu NNTP-Posting-Host: lists.gnu.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Trace: usenet.stanford.edu 1441027549 31711 208.118.235.17 (31 Aug 2015 13:25:49 GMT) X-Complaints-To: action@cs.stanford.edu Cc: chet.ramey@case.edu To: Oleg Popov , bug-bash@gnu.org Envelope-to: bug-bash@gnu.org User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 In-Reply-To: <20150828235248.GA21479@thinkpad> X-Junkmail-Status: score=10/50, host=mpv5.cwru.edu X-Junkmail-Whitelist: YES (by domain whitelist at mpv1.tis.cwru.edu) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 129.22.105.36 X-BeenThere: bug-bash@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Bug reports for the GNU Bourne Again SHell List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Xref: csiph.com gnu.bash.bug:11448 On 8/28/15 7:52 PM, Oleg Popov wrote: > Description: > Function reset_alarm() in read.def first resets SIGALRM handler and > then cancels alarm. Sometimes, SIGALRM comes between those 2 calls and > crashes (sub)shell. > > Repeat-By: > while sleep 0.00$RANDOM; do echo test; done | while true; do read -t 0.00$RANDOM; echo $REPLY; done > (usually takes a few seconds to crash, sometimes minutes) > > Fix: > Swap the lines in reset_alarm(). Thanks for the report. This will be fixed in the next release of bash. -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/