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From: John Baldwin <jhb@freebsd.org>
To: freebsd-current@freebsd.org
Subject: Re: panic: lockmgr still held [tmpfs] [vm_map_remove()->vdropl()]
 (r262186: Thu Feb 20)
Date: Fri, 28 Feb 2014 16:18:57 -0500
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 (bigwig.baldwin.cx); Fri, 28 Feb 2014 16:32:56 -0500 (EST)
Cc: Bryan Drewery <bdrewery@freebsd.org>
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On Friday, February 28, 2014 9:18:51 am Bryan Drewery wrote:
> 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}

Can you please grab people.freebsd.org/~jhb/gdb/*

and then do 'cd /path/to/files', 'source gdb6', 'frame 4', 'lockmgr_owner lk'?

-- 
John Baldwin