2 bonnies can stop disk activity permanently

[Kris Kennaway]

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
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