Date: Wed, 26 Oct 2011 19:45:17 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: freebsd-current@freebsd.org Subject: Re: Fatal trap 12: page fault while in kernel mode -- Stopped at atomic_subtract_int+0x4 Message-ID: <20111026194517.1d20472a@fabiankeil.de> In-Reply-To: <20111019230915.041aa981@fabiankeil.de> References: <20110927220015.375ac343@fabiankeil.de> <20111019230915.041aa981@fabiankeil.de>
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[-- Attachment #1 --] Fabian Keil <freebsd-listen@fabiankeil.de> wrote: > Fabian Keil <freebsd-listen@fabiankeil.de> wrote: > > > I pretty reproducible get the following (handtranscribed) panic > > when sending an zfs snapshot to geli provider based on an USB > > stick that disappears (due to a bug, or because it's unplugged): > > > > Fatal trap 12: page fault while in kernel mode > > cpuid = 0: apic id = 00 > > fault virtual address = 0x288 > > fault code = supervisor write data, page not present > > instruction pointer = 0x20:0xffffffff808e2984 > > stack pointer = 0x28:0xffffff800023fba0 > > frame pointer = 0x28:0xffffff800023fbb0 > > code segment = base 0x0, limit 0xfffff, type 0x1b > > = DPL 0, pres 1, long 1, def32 0, gran 1 > > processor eflags = interrupt enabled, resume, IOPL = 0 > > current process = 13 (g_up) > > [ thread pid 13 tid 100010 ] > > Stopped at atomic_subtract_int+0x4: lock subl %esi,(%rdi) > Here's another one, again with recent HEAD. > > This time the USB stick disappeared while the pool was > being scrubbed and dumping actually worked. The stick > seems to reproducibly disappear after scrubbing it for > a while and the panic seems to be reproducible as well. > > The stack trace looks a bit different, but I'm not sure if > this is because it's a slightly different situation or because > of changes in HEAD. They are different and can be reproduced independently. I filed PRs for them: http://www.freebsd.org/cgi/query-pr.cgi?pr=162010 http://www.freebsd.org/cgi/query-pr.cgi?pr=162036 Fabian [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAk6oRzIACgkQBYqIVf93VJ0V8ACfZsjtLSPiDd6kapKu/cCp1AH/ lqUAoJHA43DCK7aieEDwao9PTbzDzE+n =sSNJ -----END PGP SIGNATURE-----help
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