[Bug 210430] Lock order reversal zfs_vfsops.c - when switching to snapshots directory

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Tue Jun 21 10:56:27 UTC 2016


            Bug ID: 210430
           Summary: Lock order reversal zfs_vfsops.c - when switching to
                    snapshots directory
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: tm+freebsd at core.io

When switching to an ZFS snapshots folder I receive a lock order reversal. For
example if /usr/src is a zfs dataset and snapshots exists:

$ cd /usr/src/.zfs/snapshot
$ ls

lock order reversal:
 1st 0xfffff80005fcad50 zfs (zfs) @
 2nd 0xfffff80005fcb068 zfs_gfs (zfs_gfs) @
stack backtrace:
#0 0xffffffff80aa7550 at witness_debugger+0x70
#1 0xffffffff80aa7444 at witness_checkorder+0xe54
#2 0xffffffff80a20902 at __lockmgr_args+0x4c2
#3 0xffffffff80af6efc at vop_stdlock+0x3c
#4 0xffffffff81014f21 at VOP_LOCK1_APV+0xe1
#5 0xffffffff80b17dda at _vn_lock+0x9a
#6 0xffffffff8221f47b at zfs_lookup+0x51b
#7 0xffffffff8221f7f1 at zfs_freebsd_lookup+0x91
#8 0xffffffff810126bb at VOP_CACHEDLOOKUP_APV+0xdb
#9 0xffffffff80af3b36 at vfs_cache_lookup+0xd6
#10 0xffffffff8101255b at VOP_LOOKUP_APV+0xdb
#11 0xffffffff80afc842 at lookup+0x5a2
#12 0xffffffff80afbed2 at namei+0x5b2
#13 0xffffffff80b12668 at kern_statat+0xa8
#14 0xffffffff80b1259d at sys_stat+0x2d
#15 0xffffffff80eb8b2b at amd64_syscall+0x2db
#16 0xffffffff80e981fb at Xfast_syscall+0xfb

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