Locked up processes after upgrade to ZFS v15
Martin Simmons
martin at lispworks.com
Fri Oct 8 15:19:10 UTC 2010
>>>>> On Wed, 6 Oct 2010 20:51:49 +0200, Kai Gallasch said:
>
> Am 06.10.2010 um 19:32 schrieb Martin Simmons:
>
> >>>>>> On Wed, 6 Oct 2010 14:28:31 +0200, Kai Gallasch said:
> >>
> >> How can I debug this and get further information?
> >
> > procstat -k -k $pid will generate a backtrace (or replace $pid by -a for all
> > processes).
>
> procstat for process 12111 (state: zfs)
> sonnenkraft:~ # procstat -k -k 12111
> PID TID COMM TDNAME KSTACK
> 12111 102385 httpd - mi_switch+0x21b sleepq_switch+0x123 sleepq_wait+0x4d __lockmgr_args+0x7ae vop_stdlock+0x39 VOP_LOCK1_APV+0x9b _vn_lock+0x57 vget+0x7b cache_lookup+0x4e0 vfs_cache_lookup+0xc0 VOP_LOOKUP_APV+0xb7 lookup+0x3d3 namei+0x457 vn_open_cred+0x1e3 kern_openat+0x181 syscall+0x102 Xfast_syscall+0xe2
It looks like this thread is waiting for a lock.
So the question is, which thread is holding the lock? It might be possible to
see from procstat -k -k -a but otherwise I think you will need to run it with
kdb and look at the lock.
__Martin
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