uma_zalloc_arg complaining about non-sleepable locks

[Peter Jeremy]

I have just upgraded to 8-STABLE/amd64 from about 18 hours ago and am
now getting regular (the following pair of messages about every
minute) compaints as follows:

kernel: uma_zalloc_arg: zone "mbuf" with the following non-sleepable locks held:
kernel: exclusive sleep mutex sp_lock (sp_lock) r = 0 (0xffffff000460bb00) locked @ /usr/src/sys/rpc/svc.c:1098
kernel: KDB: stack backtrace:
kernel: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
kernel: _witness_debugger() at _witness_debugger+0x2c
kernel: witness_warn() at witness_warn+0x2c2
kernel: uma_zalloc_arg() at uma_zalloc_arg+0x29d
kernel: nfs_realign() at nfs_realign+0x5f
kernel: fha_assign() at fha_assign+0x2d8
kernel: svc_run_internal() at svc_run_internal+0x1ee
kernel: svc_thread_start() at svc_thread_start+0xb
kernel: fork_exit() at fork_exit+0x112
kernel: fork_trampoline() at fork_trampoline+0xe
kernel: --- trap 0xc, rip = 0x80069e04c, rsp = 0x7fffffffe6d8, rbp = 0x5 ---
kernel: uma_zalloc_arg: zone "mbuf" with the following non-sleepable locks held:
kernel: exclusive sleep mutex sp_lock (sp_lock) r = 0 (0xffffff000460bb00) locked @ /usr/src/sys/rpc/svc.c:1098
kernel: KDB: stack backtrace:
kernel: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
kernel: _witness_debugger() at _witness_debugger+0x2c
kernel: witness_warn() at witness_warn+0x2c2
kernel: uma_zalloc_arg() at uma_zalloc_arg+0x29d
kernel: nfs_realign() at nfs_realign+0x5f
kernel: fha_assign() at fha_assign+0x2d8
kernel: svc_run_internal() at svc_run_internal+0x1ee
kernel: svc_thread_start() at svc_thread_start+0xb
kernel: fork_exit() at fork_exit+0x112
kernel: fork_trampoline() at fork_trampoline+0xe
kernel: --- trap 0xc, rip = 0x80069e04c, rsp = 0x7fffffffe6d8, rbp = 0x5 ---

It looks like NFS is missing some lock/unlock pairs.  Has anyone else
seen this?  And does anyone have a fix?

-- 
Peter Jeremy
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 196 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20100126/a828807c/attachment.pgp