Re: exclusive sleep mutex mntvnode r = 0 (0xffffffff80758220) locked @ /a/asami/portbuild/amd64/src-client/sys/ufs/ffs/ffs_vfsops.c:1172

On Thu, Oct 30, 2003 at 10:18:43AM -0800, Kris Kennaway wrote:
> One of the amd64 machines died with the following.  The kernel is a
> few weeks old, so this might already be fixed.
> 
> Kris
> 
> malloc() of "64" with the following non-sleepable locks held:
> exclusive sleep mutex mntvnode r = 0 (0xffffffff80758220) locked _at_ /a/asami/portbuild/amd64/src-client/sys/ufs/ffs/ffs_vfsops.c:1172
> recursed on non-recursive lock (sleep mutex) mntvnode _at_ /a/asami/portbuild/amd64/src-client/sys/kern/vfs_subr.c:1054
> first acquired _at_ /a/asami/portbuild/amd64/src-client/sys/ufs/ffs/ffs_vfsops.c:1172
> panic: recurse
> Debugger("panic")
> Stopped at      Debugger+0x4b:  xchgl   %ebx,0x31599f
> db> where
> Debugger() at Debugger+0x4b
> panic() at panic+0x169
> witness_lock() at witness_lock+0x383
> _mtx_lock_flags() at _mtx_lock_flags+0x9c
> insmntque() at insmntque+0x2a
> vclean() at vclean+0x35b
> vgonel() at vgonel+0x51
> vrecycle() at vrecycle+0x5b
> ufs_inactive() at ufs_inactive+0x22c
> ufs_vnoperate() at ufs_vnoperate+0x14
> vrele() at vrele+0x11a
> ffs_sync() at ffs_sync+0x24f
> sync() at sync+0xdb
> syscall() at syscall+0x320
> Xfast_syscall() at Xfast_syscall+0xa7
> --- syscall (36, FreeBSD ELF64, sync), rip = 0x402084, rsp = 0x7ffffffff648, rbp = 0x3 ---
> db>

Another one:

malloc() of "256" with the following non-sleepable locks held:
exclusive sleep mutex mntvnode r = 0 (0xffffffff80758220) locked _at_ /a/asami/portbuild/amd64/src-client/sys/ufs/ffs/ffs_vfsops.c:1172
Sleeping on "drainvp" with the following non-sleepable locks held:
exclusive sleep mutex mntvnode r = 0 (0xffffffff80758220) locked _at_ /a/asami/portbuild/amd64/src-client/sys/ufs/ffs/ffs_vfsops.c:1172
panic: sleeping thread (pid 12604) owns a mutex
Debugger("panic")
Stopped at      Debugger+0x4b:  xchgl   %ebx,0x31599f
db> where
Debugger() at Debugger+0x4b
panic() at panic+0x169
propagate_priority() at propagate_priority+0xdd
_mtx_lock_sleep() at _mtx_lock_sleep+0x273
_mtx_lock_flags() at _mtx_lock_flags+0x86
insmntque() at insmntque+0x2a
vclean() at vclean+0x35b
vgonel() at vgonel+0x51
vrecycle() at vrecycle+0x5b
ufs_inactive() at ufs_inactive+0x22c
ufs_vnoperate() at ufs_vnoperate+0x14
vput() at vput+0x131
handle_workitem_remove() at handle_workitem_remove+0x1c9
process_worklist_item() at process_worklist_item+0x183
softdep_process_worklist() at softdep_process_worklist+0xc9
sched_sync() at sched_sync+0x35b
fork_exit() at fork_exit+0xd9
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffffff98721d30, rbp = 0 ---
db>