Date: Wed, 10 Dec 2003 19:58:25 +0100 From: Poul-Henning Kamp <phk@phk.freebsd.dk> To: current@freebsd.org Subject: kernel pointer polka, possibly by mount_nfs Message-ID: <58733.1071082705@critter.freebsd.dk>
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I have a 100% reproducible case here where it looks like mount_nfs tramples on the softc of a led(4) device. Stock -current kernel, HZ=1000, I've added a couple of sanity-checks in the timeout routine of led(4) and they trigger reliably on a byte which should not have been zero. In all cases so far, the currently running program is mount_nfs run from /etc/rc.mumble somewhere. The machine is a Soekris 4501 booting diskless. I have also seen a reproducible page fault panic in in_pcbremlist() if I put "set -x" as the second line in /etc/rc on the same machine, it smells the same to me. This problem likely affects 5.2-WHATEVER as well, and could be responsible for other Heisenbugs, and could be considered a showstopper. If anybody is interested in working on this, I'll be happy to test patches or provide tracebacks etc from DDB (sorry, no GDB spoken). -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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