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From: Andriy Gapon <avg@FreeBSD.org>
Subject: Re: kern/172952: 9.1 hangs on reboot after all buffers synced
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The following reply was made to PR kern/172952; it has been noted by GNATS.

From: Andriy Gapon <avg@FreeBSD.org>
To: Per olof Ljungmark <peo@intersonic.se>
Cc: bug-followup@FreeBSD.org
Subject: Re: kern/172952: 9.1 hangs on reboot after all buffers synced
Date: Wed, 24 Oct 2012 20:53:37 +0300

 on 24/10/2012 20:46 Per olof Ljungmark said the following:
 > Tracing pid 1 tid 100002 td 0xfffffe0002f80920
 > sched_switch() at sched_switch+0x119
 > mi_switch() at mi_switch+0x186
 > sleepq_timedwait() at sleepq_timedwait+0x42
 > _sleep() at _sleep+0x1c9
 > zfs_zget() at zfs_zget+0x1f5
 > zfs_get_data() at zfs_get_data+0x4a
 > zil_commit() at zil_commit+0x541
 > zfs_freebsd_write() at zfs_freebsd_write+0xba0
 > VOP_WRITE_APV() at VOP_WRITE_APV+0xb2
 > vnode_pager_generic_putpages() at vnode_pager_generic_putpages+0x1bb
 > vnode_pager_putpages() at vnode_pager_putpages+0xa9
 > vm_pageout_flush() at vm_pageout_flush+0xc0
 > vm_object_page_collect_flush() at vm_object_page_collect_flush+0x143
 > vm_object_page_clean() at vm_object_page_clean+0x143
 > vm_object_terminate() at vm_object_terminate+0x215
 > vnode_destroy_vobject() at vnode_destroy_vobject+0xb9
 > zfs_freebsd_reclaim() at zfs_freebsd_reclaim+0x57
 > vgonel() at vgonel+0x127
 > vflush() at vflush+0x2bf
 > 
 
 OK, in your case this seems to be an instance of an already known problem:
 http://thread.gmane.org/gmane.os.freebsd.devel.file-systems/15847/focus=16056
 There is an ongoing work to fix it.
 I can point you to _my_ WIP patch or/and github branch, whichever is more
 convenient for you.  There is also the Justin's patch.
 
 P.S. Others who reported the same problem: the same symptoms do not imply the same
 cause, so you need to repeat the debugging steps in your environment.
 
 -- 
 Andriy Gapon