Re: 2.6.23-rc6: hanging ext3 dbench tests

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On Tue, 11 Sep 2007, Andy Whitcroft wrote:
>
> I have a couple of failed test runs against 2.6.23-rc6 where the
> job timed out while running dbench over ext3.  Both on powerpc,
> though both significantly different hardware setups.  A failed
> run like this implies that the machine was still responsive to
> other processes but the dbench was making no progress.  There is
> no console diagnostics during the failure.

Since the machine seems to be otherwise alive, can you do a sysrq-W (which 
is most easily done by just doing a

	echo w > /proc/sysrq-trigger

and you don't actually need any console access or anything like that).

That should give you all the blocked process traces, and if it's a 
deadlock on some semaphore or other, it should all stand out quite nicely.

In fact, things like the above are probably worth scripting for any 
automated testing - if you auto-fail after some time, please make the 
failure case do that sysrq-W by default.

(The other sysrq things can be useful too - "T" shows the same as "W", 
except for _all_ tasks, which is often so verbose that it hides the 
problem, but is sometimes the right thing to do).

			Linus
-
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Reiser Filesystem Development]     [Ceph FS]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite National Park]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]     [Linux Media]

  Powered by Linux