with 7.0-Beta4, I'm getting quiet a few of these: lockmgr: thread 0xffffff00039269f0 unlocking unheld lock KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a _lockmgr() at _lockmgr+0x6ae VOP_UNLOCK_APV() at VOP_UNLOCK_APV+0x46 unionfs_unlock() at unionfs_unlock+0x22f VOP_UNLOCK_APV() at VOP_UNLOCK_APV+0x46 vn_read() at vn_read+0x264 dofileread() at dofileread+0xa1 kern_readv() at kern_readv+0x4c read() at read+0x54 syscall() at syscall+0x254 Xfast_syscall() at Xfast_syscall+0xab --- syscall (3, FreeBSD ELF64, read), rip = 0x80187b18c, rsp = 0x7fffffffafb8, rbp = 0x7fffffffb045 --- danny