Date: Tue, 5 Oct 1999 22:00:01 -0700 (PDT) From: Brian Somers <brian@Awfulhak.org> To: freebsd-bugs@FreeBSD.org Subject: Re: bin/14145: PPP userland/client (3.3-REL) throws core Message-ID: <199910060500.WAA20943@freefall.freebsd.org>
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The following reply was made to PR bin/14145; it has been noted by GNATS. From: Brian Somers <brian@Awfulhak.org> To: Ruslan Ermilov <ru@ucb.crimea.ua> Cc: Klaus-Juergen Wolf <kjwolf@seismic.de>, FreeBSD-gnats-submit@freebsd.org, Brian Somers <brian@freebsd.org> Subject: Re: bin/14145: PPP userland/client (3.3-REL) throws core Date: Wed, 06 Oct 1999 05:07:56 +0100 [.....] > Yeah, this happened to me too: > > Oct 5 10:28:08 relay /kernel: pid 23005 (ppp), uid 0: exited on signal 10 (core dumped) > Oct 5 20:07:28 relay /kernel: pid 77580 (ppp), uid 0: exited on signal 10 (core dumped) > > I have compiled `ppp' with debug symbols, and will send a backtrace on the > next core. > > Anything else, Brian? Some patches ? ;^1 Seriously, I believe there's a bug in the way VJ packets are handled where ppp ends up scribbling over the return address on the stack. Once the deed has happened, there's very little information left.... What I think I really need is a way of actually reproducing the problem. It's never happened to me, but it's been happening to people for years. I think the only way to catch something like this is to get the compiler to put the function return address in read-only memory so that a stack-scribble will produce a core when it happens rather than after the fact.... Do you know if gcc is capable of doing this ? Do you know of any better ways of tackling the problem ? > -- > Ruslan Ermilov Sysadmin and DBA of the > ru@ucb.crimea.ua United Commercial Bank, > ru@FreeBSD.org FreeBSD committer, > +380.652.247.647 Simferopol, Ukraine > > http://www.FreeBSD.org The Power To Serve > http://www.oracle.com Enabling The Information Age Cheers. -- Brian <brian@Awfulhak.org> <brian@FreeBSD.org> <http://www.Awfulhak.org>; <brian@OpenBSD.org> Don't _EVER_ lose your sense of humour ! <brian@FreeBSD.org.uk> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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