Date: Sun, 08 Oct 2006 11:01:46 -0600 From: Scott Long <scottl@samsco.org> To: Kris Kennaway <kris@obsecurity.org> Cc: freebsd-fs@freebsd.org Subject: Re: 2 bonnies can stop disk activity permanently Message-ID: <45292EFA.4060903@samsco.org> In-Reply-To: <20061008165823.GA2061@xor.obsecurity.org> References: <20061008152213.59247.qmail@web30307.mail.mud.yahoo.com> <20061008165823.GA2061@xor.obsecurity.org>
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Kris Kennaway wrote: > On Sun, Oct 08, 2006 at 08:22:13AM -0700, R. B. Riddick wrote: > >>Hi! >> >>We (me and Veronica) mentioned, that starting 2 bonnie (ports/bench) processes on a UFS >>1. on a geom_bsd, geom_disk (like ad4 or da0) and geom_stripe (using ad4a, ..., ad10a) >>2. with different controllers areca and nVidia and different motherboards and >>3. with up to 8 SATA disks >>results in a permanently disk-dead system. >> >> >>Veronica's box had more than 700MB of free memory (according to top), when it happened. >> >>Heavy load (caused by blogbench, rawio, raidtest and dd) causes no problem, while bonnie gets stuck somewhere between putc phase and end of rewrite phase. >> >>The bonnie processes were blocked due to "nbufkv" (some VFS reason). >>Geom activity is impossible then (no file system activity happens). >>No syslog message can be seen on the console. > > > You forgot to even mention what version you're running ;-) > > Also show your kernel config file. Configure DDB per the chapter on > kernel debugging in the developers handbook, break to DDB from the > console or serial console, then show us what processes are running and > what are their backtraces. > > Kris No need for all of that information, the bug in vfs_bio.c is quite obvious. =-( Fixing it will take some thought, though. Scott
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