kern/172630: LOR zfs/zfs_vfsops.c kern/kern_descrip.c

[Robert Schulze]

>Number:         172630
>Category:       kern
>Synopsis:       LOR zfs/zfs_vfsops.c kern/kern_descrip.c
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Oct 12 08:20:00 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     Robert Schulze
>Release:        8.3-STABLE
>Organization:
>Environment:
FreeBSD hostname 8.3-STABLE FreeBSD 8.3-STABLE #19: Fri Sep 28 12:07:17 CEST 2012     root at hostname:/usr/obj/usr/src/sys/BAK  amd64

>Description:
Just want to report that LOR:

kernel: lock order reversal:
kernel: 1st 0xffffff00892dca58 zfs (zfs) @ /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vfsops.c:1700
kernel: 2nd 0xffffffff809651c0 allproc (allproc) @ /usr/src/sys/kern/kern_descrip.c:2547
kernel: KDB: stack backtrace:
kernel: #0 0xffffffff80476c96 at kdb_backtrace+0x66
kernel: #1 0xffffffff80485f95 at _witness_debugger+0x65
kernel: #2 0xffffffff80487024 at witness_checkorder+0x694
kernel: #3 0xffffffff8044f8fc at _sx_slock+0x4c
kernel: #4 0xffffffff804156ce at mountcheckdirs+0x3e
kernel: #5 0xffffffff804c926b at dounmount+0x41b
kernel: #6 0xffffffff80eaac92 at zfs_unmount_snap+0xb2
kernel: #7 0xffffffff80eaadc5 at zfs_ioc_destroy_snaps_nvl+0xd5
kernel: #8 0xffffffff80eaaa96 at zfsdev_ioctl+0xe6
kernel: #9 0xffffffff803e584a at devfs_ioctl_f+0x7a
kernel: #10 0xffffffff8048878e at kern_ioctl+0xfe
kernel: #11 0xffffffff8048899f at ioctl+0xef
kernel: #12 0xffffffff806711c9 at amd64_syscall+0x119
kernel: #13 0xffffffff8065abdc at Xfast_syscall+0xfc

>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: