Date: Wed, 4 Oct 2006 15:41:48 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Vivek Khera <vivek@khera.org> Cc: Kostik Belousov <kostikbel@gmail.com>, stable@freebsd.org Subject: Re: ffs snapshot lockup Message-ID: <20061004194148.GA37672@xor.obsecurity.org> In-Reply-To: <BB1FAD7A-1114-49D6-BC2E-C1B4B9D0C807@khera.org> References: <917B087C-5E13-4D7F-94FA-95CB0E5C1884@khera.org> <20060922190328.GA64849@xor.obsecurity.org> <555B84D2-520F-44D6-84D6-CF9CE7EE47C7@khera.org> <20060922203654.GA65693@xor.obsecurity.org> <847DD3A5-D5DD-4D3E-B755-64B13D1DA506@khera.org> <20061003084315.GA89654@deviant.kiev.zoral.com.ua> <DFEA4E5F-2337-4383-8765-F5901BDA49E9@khera.org> <20061004140808.GD89654@deviant.kiev.zoral.com.ua> <20061004163944.GA35412@xor.obsecurity.org> <BB1FAD7A-1114-49D6-BC2E-C1B4B9D0C807@khera.org>
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[-- Attachment #1 --] On Wed, Oct 04, 2006 at 01:06:37PM -0400, Vivek Khera wrote: > > On Oct 4, 2006, at 12:39 PM, Kris Kennaway wrote: > > >>> > >>>The only thing I think was running at the time would be a large file > >>>copy from a remote system to this one using rsync. > >> > >>As I understand, you got the panic. Then, you shall post the panic > >>message. > >>If you have core file, then running kgdb on the core may show > >>required > >>information. > >>(it shall be on the console exactly before en > >>and backtrace (using the bt command of ddb) of the paniced thread. > > > >YOu can also do 'show msgbuf' from DDB. > > > > i ran kgdb on the vmcore file. since the dump was generated by > calling doadump from DDB, the backtrace was showing the call stack of > that. > > from what i read in the output from kgdb, it seems that something > locked the kernel and we broke to debugger from the watchdog timeout > (I enable software watchdog). Hmm, be careful with that - if you set the timeout too low (and note that for some workloads O(minutes) may even be too low) then you'll get a lot of false positives. Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFFJA58Wry0BWjoQKURAr5dAKDf4YLcBJU9owRw6N1L3FcgJkvOOgCfRQkq bd8+tGZVB28bkYBN6KL7iO0= =B7Vl -----END PGP SIGNATURE-----
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