FreeBSD lock order reversal (LOR) #266

lock order reversal:
 1st 0xffffff00054f6ba8 ufs (ufs) @ sys/kern/vfs_subr.c:2047
 2nd 0xfffffffee598b1c8 bufwait (bufwait) @ sys/ufs/ffs/ffs_softdep.c:6150
 3rd 0xffffff00054f69d0 ufs (ufs) @ sys/kern/vfs_subr.c:2047
		
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+0xc2a
ffs_lock() at ffs_lock+0x8c
VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b
_vn_lock() at _vn_lock+0x47
vget() at vget+0x8b
vfs_hash_get() at vfs_hash_get+0xd5
ffs_vgetf() at ffs_vgetf+0x48
softdep_sync_metadata() at softdep_sync_metadata+0x459
ffs_syncvnode() at ffs_syncvnode+0x210
ffs_fsync() at ffs_fsync+0x18
ufs_direnter() at ufs_direnter+0x314
ufs_makeinode() at ufs_makeinode+0x338
VOP_CREATE_APV() at VOP_CREATE_APV+0x8d
vn_open_cred() at vn_open_cred+0x479
kern_openat() at kern_openat+0x15e
syscall() at syscall+0x1bf
Xfast_syscall() at Xfast_syscall+0xab
--- syscall (5, FreeBSD ELF64, open), rip = 0x800a77c4c, rsp =
0x7fffffffe748, rbp = 0x1a4 ---
		

• freebsd-current (thread)