Date: Wed, 31 May 2000 15:12:34 -0500 (CDT) From: Guy Helmer <ghelmer@cs.iastate.edu> To: "David E. Cross" <crossd@cs.rpi.edu> Cc: Matthew Dillon <dillon@apollo.backplane.com>, freebsd-hackers@FreeBSD.ORG Subject: Re: PR #10971, not dead yet. Message-ID: <Pine.HPX.4.05.10005311509440.9820-100000@popeye.cs.iastate.edu> In-Reply-To: <200005311910.PAA81975@cs.rpi.edu>
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On Wed, 31 May 2000, David E. Cross wrote: > > If you can reproduce the problem regularly then I recommend putting > > a signal guard in to see if the corruption is being caused by the > > signal interrupting at an inausipcious moment. > > > > In main() block SIGHUP, SIGINT, SIGTERM, and SIGCHLD using sigsetmask(). > > > > Just prior to the select call unblock the signals. > > > > Just after the select call reblock the signals. > > > > And see if the corruption still occurs. If this fixes the problem, > > then there is probably something in the reaper() (in yp_main.c) > > that is causing corruption, probably by ripping a structure out from > > under whatever piece of code the signal happens to interrupt. > > > > I took a quick look at the code and as far as I can tell it implements > > no guards whatsoever. The inetd code had similar problems in the past. > > Alas, this is not something I have been able to reliably reproduce, it seems > to trigger itself every so-often (and at inconvienient times). But no > matter what I do by myself it will not trip. Is it possibly related to a low-memory situation? I'm trying to solve a problem in cron that sounds similar, and seems to be triggered when the machine goes into swapping. I'm unable to duplicate it myself :-( Guy Guy Helmer, Ph.D. Candidate, Iowa State University Dept. of Computer Science Research Assistant, Dept. of Computer Science --- ghelmer@cs.iastate.edu http://www.cs.iastate.edu/~ghelmer To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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