process hang in zfs->io_ ?
ganbold at micom.mng.net
Tue Feb 3 06:16:04 PST 2009
Peter Schuller wrote:
>> I'm running current as of 20080130 on an amd64 box. I can make
>> processes stuck in zfs->io_ (output truncated in ddb and top) when I
>> make some packages via ports tinderbox. The ports tinderbox access
>> local disk via nfs (I also tried nullfs).
>> ddb output of ps and alltrace can be found at
>> Any ideas?
> A workaround is to disable the ZIL (vfs.zfs.zil_disable="1"), if you
> can afford that on the system in question. It will break the
> durability of fsync(), but retain it's write barrier semantics.
> Btw, does anyone have a good grasp of the status of this bug? I have
> seen vague referenced to it being a memory related deadlock for
> example, but that's about it. Is the cause known but difficult to fix,
> or just unknown?
I've observed similar system hang when I tried to run svn update on
FreeBSD head repo
from 2 local directories simultaneously. I might be doing something
wrong and as
I remember I reproduced it a couple of times.
It is i386 CURRENT (r187663M) machine and loader.conf settings are:
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