Date: Mon, 26 Apr 2004 20:33:00 +0100 (BST) From: Gavin Atkinson <gavin.atkinson@ury.york.ac.uk> To: Dan Nelson <dnelson@allantgroup.com> Cc: freebsd-current@freebsd.org Subject: Re: panic: Exit: Single threading fouled up Message-ID: <20040426202510.P40120@ury.york.ac.uk> In-Reply-To: <20040426172146.GE2771@dan.emsphone.com> References: <20040426174558.Y36874@ury.york.ac.uk> <20040426172146.GE2771@dan.emsphone.com>
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On Mon, 26 Apr 2004, Dan Nelson wrote: > In the last episode (Apr 26), Gavin Atkinson said: > > I've seen this panic twice now, once on a heavily loaded UP machine > > running gnome at the time, and once on an SMP (hyperthreaded) machine > > which was mostly idle as it was shutting down. Both running with ULE. > I've gotten it 6 times while running the pike testsuite, but not > reliably enough that I can run a WITNESS kernel for a couple hours and > catch it. SMP system, 4BSD scheduler, libpthread. Hangs trying to > flush buffers so it has never generated a crashdump. The couple of > times I was able to break into the debugger before the hang, a ps > showed most of the processes in the system waiting for the "proctree" > mutex. I'll find out what ps says from DDB next time it happens. I am running with WITNESS enabled, but haven't seen any extra messages or anything before the hang. I am using a libmap.conf to map everythng to libpthread. I'm cvsupping to top-of-tree at the moment, but I can't see any changes that would have fixed this. Gavin
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