Rafael J. Wysocki wrote:
> I've got the following BUG on Asus L5D (x86-64) with the 2.6.13-rc5-mm1 kernel:
>
> BUG: rwlock recursion on CPU#0, nscd/3668, ffffffff8817d4a0
>
> Call Trace:<ffffffff80241ca9>{add_preempt_count+105} <ffffffff80241682>{rwlock_bug+114}
> <ffffffff8024179e>{_raw_write_lock+62} <ffffffff80350f48>{_write_lock_bh+40}
> <ffffffff88171824>{:ip_conntrack:destroy_conntrack+196}
> <ffffffff88170435>{:ip_conntrack:__ip_ct_event_cache_init+165}
> <ffffffff88170549>{:ip_conntrack:ip_ct_refresh_acct+249}
> <ffffffff88173c4f>{:ip_conntrack:udp_packet+47} <ffffffff88172143>{:ip_conntrack:ip_conntrack_in+1059}
> <ffffffff8816fb4c>{:ip_conntrack:ip_conntrack_local+76}
> <ffffffff802fe7ec>{nf_iterate+92} <ffffffff80311d90>{dst_output+0}
> <ffffffff802ff3de>{nf_hook_slow+142} <ffffffff80311d90>{dst_output+0}
> <ffffffff803123bf>{ip_push_pending_frames+895} <ffffffff802eade9>{lock_sock+201}
> <ffffffff8032e72e>{udp_push_pending_frames+574} <ffffffff8032ffc7>{udp_sendmsg+1703}
> <ffffffff8013874e>{current_fs_time+78} <ffffffff8015c03c>{file_read_actor+60}
> <ffffffff80199b6c>{update_atime+76} <ffffffff8015e8fa>{do_generic_mapping_read+1194}
> <ffffffff80335946>{inet_sendmsg+86} <ffffffff802e7dff>{sock_sendmsg+271}
> <ffffffff80241ca9>{add_preempt_count+105} <ffffffff8016153e>{free_hot_cold_page+270}
> <ffffffff801615bb>{free_hot_page+11} <ffffffff80241ca9>{add_preempt_count+105}
> <ffffffff8014a670>{autoremove_wake_function+0} <ffffffff802e846c>{sockfd_lookup+28}
> <ffffffff802e9c64>{sys_sendto+260} <ffffffff80193003>{do_sys_poll+851}
> <ffffffff80193de0>{__pollwait+0} <ffffffff8010eb3e>{system_call+126}
I fear my event cache fixes are responsible for this, we must not cache
events while holding a lock anymore because we might need to deliver
old cached events. I'll try to come up with a fix later.
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