LOR: ZFS/syncer: on mount of msdosfs

From: Larry Rosenman <ler_at_lerctr.org>
Date: Sat, 20 Feb 2016 06:48:01 -0600
Is this a known LOR:
lock order reversal:
  1st 0xfffff801d20ea5f0 zfs (zfs) _at_ /usr/src/sys/kern/vfs_mount.c:1222
  2nd 0xfffff801d2fe6418 syncer (syncer) _at_ 
/usr/src/sys/kern/vfs_subr.c:2618
stack backtrace:
#0 0xffffffff80a7f810 at witness_debugger+0x70
#1 0xffffffff80a7f711 at witness_checkorder+0xe71
#2 0xffffffff809fe5cb at __lockmgr_args+0xd3b
#3 0xffffffff80ac525c at vop_stdlock+0x3c
#4 0xffffffff80fbd640 at VOP_LOCK1_APV+0x100
#5 0xffffffff80ae5f2a at _vn_lock+0x9a
#6 0xffffffff80ad6c38 at vputx+0x208
#7 0xffffffff80aceaf0 at dounmount+0x410
#8 0xffffffff80ace64d at sys_unmount+0x35d
#9 0xffffffff80e6e15b at amd64_syscall+0x2db
#10 0xffffffff80e4dd4b at Xfast_syscall+0xfb
lock order reversal:
  1st 0xfffff801d20ea5f0 zfs (zfs) _at_ /usr/src/sys/kern/vfs_mount.c:1222
  2nd 0xfffff801d2fe65f0 devfs (devfs) _at_ 
/usr/src/sys/fs/msdosfs/msdosfs_vfsops.c:994
stack backtrace:
#0 0xffffffff80a7f810 at witness_debugger+0x70
#1 0xffffffff80a7f711 at witness_checkorder+0xe71
#2 0xffffffff809fe5cb at __lockmgr_args+0xd3b
#3 0xffffffff80ac525c at vop_stdlock+0x3c
#4 0xffffffff80fbd640 at VOP_LOCK1_APV+0x100
#5 0xffffffff80ae5f2a at _vn_lock+0x9a
#6 0xffffffff809075a3 at msdosfs_sync+0x193
#7 0xffffffff80acebc9 at dounmount+0x4e9
#8 0xffffffff80ace64d at sys_unmount+0x35d
#9 0xffffffff80e6e15b at amd64_syscall+0x2db
#10 0xffffffff80e4dd4b at Xfast_syscall+0xfb

$ uname -a
FreeBSD lrosenman-dell 11.0-CURRENT FreeBSD 11.0-CURRENT #1 r295833M: 
Sat Feb 20 06:13:34 CST 2016     
root_at_lrosenman-dell:/usr/obj/usr/src/sys/GENERIC  amd64
$


-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 214-642-9640                 E-Mail: ler_at_lerctr.org
US Mail: 7011 W Parmer Ln, Apt 1115, Austin, TX 78729-6961
Received on Sat Feb 20 2016 - 11:48:02 UTC

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