kern/162008: [zfs] Latest 9-STABLE and 10-CURRENT fail to boot from ZFS v15 root [regression]

[Robert Millan]

The following reply was made to PR kern/162008; it has been noted by GNATS.

From: Robert Millan <rmh at debian.org>
To: Andriy Gapon <avg at freebsd.org>
Cc: bug-followup at freebsd.org
Subject: Re: kern/162008: [zfs] Latest 9-STABLE and 10-CURRENT fail to boot
 from ZFS v15 root [regression]
Date: Sat, 5 Nov 2011 00:11:34 +0100

 2011/10/30 Andriy Gapon <avg at freebsd.org>:
 > IMO, not likely.
 > Please try setting vfs.zfs.debug=1 via loader.conf.
 > Maybe additional debug information will make the situation clearer.
 
 Strangely, the system boots now, but kernel panics as soon as "zfs
 volinit" is attempted:
 
 vdev_geom_open_by_guid:352[1]: Searching by guid [13849114725133984793].
 panic: _sx_xlock_hard: recursed on non-recursive sx spa_namespace_lock
 @ /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zvol.c:877
 
 It also drops me to a debug prompt. Backtrace:
 
 kdb_enter
 panic
 _sx_xlock_hard
 _sx_xlock
 zvol_geom_access
 g_access
 vdev_geom_open
 vdev_open
 vdev_open_children
 vdev_root_open
 vdev_open
 spa_load
 spa_load_best
 spa_open_common
 spa_get_stats
 zfs_ioc_pool_stats
 zfsdev_ioctl
 devfs_ioctl_f
 kern_ioctl
 
 (this happened with 9-STABLE, SVN r226626)
 
 -- 
 Robert Millan