well, when running e1000 through some code paths on FC4 +
2.6.17-rc5-mm1 + ingo's latest rollup patch, with this lockdep debug
option enabled I got this:
e1000: eth1: e1000_watchdog_task: NIC Link is Up 1000 Mbps Full Duplex
======================================
[ BUG: bad unlock ordering detected! ]
--------------------------------------
mDNSResponder/2361 is trying to release lock (&in_dev->mc_list_lock) at:
[<ffffffff81233f5a>] ip_mc_add_src+0x85/0x1f8
but the next lock to release is:
(&im->lock){-+..}, at: [<ffffffff81233f52>] ip_mc_add_src+0x7d/0x1f8
other info that might help us debug this:
2 locks held by mDNSResponder/2361:
#0: (rtnl_mutex){--..}, at: [<ffffffff81253741>] mutex_lock+0x27/0x2c
#1: (&in_dev->mc_list_lock){-.-?}, at: [<ffffffff81233f14>]
ip_mc_add_src+0x3f/0x1f8
stack backtrace:
Call Trace:
[<ffffffff8100a8c0>] show_trace+0xa4/0x204
[<ffffffff8100ac32>] dump_stack+0x15/0x17
[<ffffffff8104495b>] lockdep_release+0x197/0x329
[<ffffffff81254e45>] _read_unlock+0x1c/0x28
[<ffffffff81233f5a>] ip_mc_add_src+0x85/0x1f8
[<ffffffff812342f5>] ip_mc_inc_group+0x1b5/0x220
[<ffffffff8123493e>] ip_mc_join_group+0xcf/0xf3
[<ffffffff81214ca7>] do_ip_setsockopt+0x697/0x99d
[<ffffffff81215059>] ip_setsockopt+0x24/0x8b
[<ffffffff8122c5bc>] udp_setsockopt+0xe/0x1c
[<ffffffff811ec236>] sock_common_setsockopt+0xf/0x11
[<ffffffff811ea425>] sys_setsockopt+0x8f/0xb4
[<ffffffff810093c2>] tracesys+0xd1/0xdb
e1000: eth1: e1000_watchdog_task: NIC Link is Down
e1000: eth1: e1000_watchdog_task: NIC Link is Up 1000 Mbps Full Duplex
.config attached.
As an aside, when I first tried to enable this I turned on the
selftest but turned off all the lockdep options besides spinlock and
the selftest fails.
Attachment:
config.gz
Description: GNU Zip compressed data
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