8.0-BETA4 LOR vfs(syncer)/zfs

[Jeff Blank]

this didn't seem to cause me any problems, but I thought I'd mention
it anyway, since I didn't find anything that looked similar in the
list archives, at the sources.zabbadoz.net LOR list, or with a quick
google.  happened with 8.0-BETA4/amd64 from around 0200 UTC Sep 10,
GENERIC kernel.

Jeff


lock order reversal:
 1st 0xffffff0005feb620 syncer (syncer) @ /usr/src/sys/kern/vfs_subr.c:1693
 2nd 0xffffff014651f270 zfs (zfs) @ /usr/src/sys/modules/zfs/../../cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c:152
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
_witness_debugger() at _witness_debugger+0x2e
witness_checkorder() at witness_checkorder+0x81e
__lockmgr_args() at __lockmgr_args+0xcf3
vop_stdlock() at vop_stdlock+0x39
VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b
_vn_lock() at _vn_lock+0x47
zfs_znode_cache_constructor() at zfs_znode_cache_constructor+0x4e
zfs_znode_alloc() at zfs_znode_alloc+0x39
zfs_zget() at zfs_zget+0x25d
zfs_get_data() at zfs_get_data+0x4d
zil_commit() at zil_commit+0x532
zfs_sync() at zfs_sync+0xa6
sync_fsync() at sync_fsync+0x13a
sync_vnode() at sync_vnode+0x157
sched_sync() at sched_sync+0x1d1
fork_exit() at fork_exit+0x12a
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffff82531dfd30, rbp = 0 ---