Date: Thu, 5 Oct 2006 06:51:42 +0200 From: Peter Holm <peter@holm.cc> To: Kris Kennaway <kris@obsecurity.org> Cc: Kostik Belousov <kostikbel@gmail.com>, Vivek Khera <vivek@khera.org>, stable@freebsd.org Subject: Re: ffs snapshot lockup Message-ID: <20061005045142.GA81766@peter.osted.lan> In-Reply-To: <20061004194148.GA37672@xor.obsecurity.org> References: <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> <20061004194148.GA37672@xor.obsecurity.org>
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On Wed, Oct 04, 2006 at 03:41:48PM -0400, Kris Kennaway wrote: > 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. > Oh, yes. I've using this with success: watchdogd -t 3600 -e 'ls /tmp /dev > /dev/null; true' -s 60 - Peter > Kris > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.5 (FreeBSD) > > iD8DBQFFJA58Wry0BWjoQKURAr5dAKDf4YLcBJU9owRw6N1L3FcgJkvOOgCfRQkq > bd8+tGZVB28bkYBN6KL7iO0= > =B7Vl > -----END PGP SIGNATURE-----
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