file system deadlock - the whole story?

User Freebsd freebsd at
Wed Jul 19 14:23:18 UTC 2006

On Wed, 19 Jul 2006, Robert Watson wrote:

> On Wed, 19 Jul 2006, User Freebsd wrote:
>> Also note that under FreeBSD 4.x, all three of these machines were pretty 
>> much my more solid machines, with even more vServers running on them then 
>> I'm able to run with 6.x ... once I got rid of using unionfs, stability 
>> skyrocketed :(
>> Hrmmmm ... but, your 'controller driver' comment ... that is one common 
>> thing amongst all three servers ... they are all running the iir driver ... 
>> not sure the *exact* controller, but pluto (older Dual-PIII) shows it as:
> Yes, this was going to be my next question -- if you're seeing wedges under 
> load and there's a common controller in use, maybe we're looking at a driver 
> bug.  Bugs of those sort typically look a lot like what you describe: an I/O 
> is "lost" and so eveything that depends on the I/O wedges waiting for it, 
> leading to a lot of processes hanging around waiting for vnode locks, etc.

'k, but how do we debug *that*? :(  If it was one, I'd suspect hardware 
... but *three*, and only acting up *after* upgrading to FreeBSD 6.x, and 
only acting up under load ...

Marc G. Fournier           Hub.Org Networking Services (
Email . scrappy at                              MSN . scrappy at
Yahoo . yscrappy               Skype:        ICQ . 7615664

More information about the freebsd-stable mailing list