Stable from May 31 - zfs list locked

[Henri Hennebert]

Henri Hennebert wrote:
> Hello,
> 
> I encounter this problem for the second time. The system is working 
> perfectly well but suddenly the command `zfs list' don't work and can't 
> be killed.
> 
> Here is a procstat of the culprit:
> 
> [root at morzine ~]# procstat -k 91766
>   PID    TID COMM             TDNAME           KSTACK
> 91766 100490 zfs              -                mi_switch sleepq_switch 
> sleepq_wait _cv_wait zio_wait dbuf_read dmu_buf_hold zap_lockdir 
> zap_lookup_norm zap_lookup dsl_prop_get_dd dsl_dataset_get_ref 
> dsl_dataset_hold dmu_objset_open zfs_ioc_objset_stats zfsdev_ioctl 
> devfs_ioctl_f kern_ioctl
> 
> same thing happen if I try to run `zpool list' un another terminal.

Stangely, zfs snapsot and zfs destroy seems working properly ...

I reboot to check this
> 
> Henri
> 
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