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If lockd is signalled soon enough after restart then locks_start_grace() will try to re-add an entry to a list and trigger a lock corruption warning. Thanks to Wang Chen for the problem report and diagnosis. WARNING: at lib/list_debug.c:26 __list_add+0x27/0x5c() ... list_add corruption. next->prev should be prev (ef8fe958), but was ef8ff128. (next=ef8ff128). ... Pid: 23062, comm: lockd Tainted: G W 2.6.30-rc2 #3 Call Trace: [<c042d5b5>] warn_slowpath+0x71/0xa0 [<c0422a96>] ? update_curr+0x11d/0x125 [<c044b12d>] ? trace_hardirqs_on_caller+0x18/0x150 [<c044b270>] ? trace_hardirqs_on+0xb/0xd [<c051c61a>] ? _raw_spin_lock+0x53/0xfa [<c051c89f>] __list_add+0x27/0x5c [<ef8f6daa>] locks_start_grace+0x22/0x30 [lockd] [<ef8f34da>] set_grace_period+0x39/0x53 [lockd] [<c06b8921>] ? lock_kernel+0x1c/0x28 [<ef8f3558>] lockd+0x64/0x164 [lockd] [<c044b12d>] ? trace_hardirqs_on_caller+0x18/0x150 [<c04227b0>] ? complete+0x34/0x3e [<ef8f34f4>] ? lockd+0x0/0x164 [lockd] [<ef8f34f4>] ? lockd+0x0/0x164 [lockd] [<c043dd42>] kthread+0x45/0x6b [<c043dcfd>] ? kthread+0x0/0x6b [<c0403c23>] kernel_thread_helper+0x7/0x10 Reported-by: Wang Chen <wangchen@cn.fujitsu.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Cc: stable@kernel.org |
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| .. | ||
| clntlock.c | ||
| clntproc.c | ||
| grace.c | ||
| host.c | ||
| Makefile | ||
| mon.c | ||
| svc4proc.c | ||
| svc.c | ||
| svclock.c | ||
| svcproc.c | ||
| svcshare.c | ||
| svcsubs.c | ||
| xdr4.c | ||
| xdr.c | ||