zfs hang with umount

[Andriy Gapon]

on 11/03/2013 20:20 Uroš Gruber said the following:
> Hi,
> 
> I don't know what causes this, but while stopping one of jails I also
> run zfs inherit mountpoint on this jails fs. This jail was in stopping
> state at this moment. Process than hanged in D state. Then I was doing
> some stuff on the server, and while "zfs unmount -f" of that fs,
> server chrased. Now everytime I wan't to unmount that fs process hang.
> I've managed to send & receive this fs to other fs and mounted
> sucessfuly.
> 
> Before I reboot and try to destroy this fs, here is output of procstat
> -k PID (zfs umount zroot/myfs)
> 
>   PID    TID COMM             TDNAME           KSTACK
>  3937 100559 zfs              -                mi_switch
> sleepq_timedwait _sleep zfs_zget zfs_get_data zil_commit
> zfs_freebsd_write VOP_WRITE_APV vnode_pager_generic_putpages
> vnode_pager_putpages vm_pageout_flush vm_object_page_collect_flush
> vm_object_page_clean vm_object_terminate vnode_destroy_vobject
> zfs_freebsd_reclaim vgonel vflush
> 
> Is there anything I can check or is this know bug?
> 
> Server is running on 9.1-RELEASE

This should be fixed in stable/9.

-- 
Andriy Gapon