panic: lockmgr still held [tmpfs] [vm_map_remove()->vdropl()] (r262186: Thu Feb 20)

While using poudriere:

> Unread portion of the kernel message buffer:
> panic: lockmgr still held
> cpuid = 12
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe124804f7a0
> kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe124804f850
> vpanic() at vpanic+0x126/frame 0xfffffe124804f890
> kassert_panic() at kassert_panic+0x139/frame 0xfffffe124804f900
> lockdestroy() at lockdestroy+0x3b/frame 0xfffffe124804f920
> vdropl() at vdropl+0x1c8/frame 0xfffffe124804f960
> vm_object_deallocate() at vm_object_deallocate+0x10b/frame 0xfffffe124804f9c0
> vm_map_process_deferred() at vm_map_process_deferred+0x89/frame 0xfffffe124804f9f0
> vm_map_remove() at vm_map_remove+0xc8/frame 0xfffffe124804fa20
> vmspace_exit() at vmspace_exit+0xc9/frame 0xfffffe124804fa60
> exit1() at exit1+0x541/frame 0xfffffe124804fad0
> sys_sys_exit() at sys_sys_exit+0xe/frame 0xfffffe124804fae0
> ia32_syscall() at ia32_syscall+0x270/frame 0xfffffe124804fbf0
> Xint0x80_syscall() at Xint0x80_syscall+0x95/frame 0xfffffe124804fbf0
> --- syscall (1, FreeBSD ELF32, sys_sys_exit), rip = 0x281014df, rsp = 0xffffc45c, rbp = 0xffffc468 ---

> #4  0xffffffff808c00db in lockdestroy (lk=0xfffff80a88a285f0) at /usr/src/sys/kern/kern_lock.c:440
> 440             KASSERT(lk->lk_lock == LK_UNLOCKED, ("lockmgr still held"));
> (kgdb) print *lk
> $1 = {lock_object = {lo_name = 0xffffffff8201a1bd "tmpfs", lo_flags = 116588552, lo_data = 0, lo_witness = 0xfffffe00006fec00}, lk_lock = 18446735288132049184, lk_exslpfail = 0,
>   lk_timo = 51, lk_pri = 96}

I have a core.

-- 
Regards,
Bryan Drewery