2.6.15rc5git1 cfq related spinlock bad magic

[Dave Jones <davej@redhat.com>]

Just as I shutdown my desktop, this popped out..

[311578.273186] BUG: spinlock bad magic on CPU#1, pdflush/30788 (Not tainted)
[311578.293858] general protection fault: 0000 [1] SMP
[311578.308773] CPU 1
[311578.315046] Modules linked in: loop vfat fat radeon drm nfsd exportfs lockd nfs_acl ipv6 lp autofs4 rfcomm l2cap bluetooth suDec  6 03:05:39 nwo kernel: [311578.480129] Pid: 30788, comm: pdflush Not tainted 2.6.14-1.1735_FC5 #1
[311578.499972] RIP: 0010:[<ffffffff8021f8bd>] <ffffffff8021f8bd>{spin_bug+138}
[311578.520605] RSP: 0018:ffff8100307f1e68  EFLAGS: 00010082
[311578.537316] RAX: 00000000c4be8326 RBX: e6491e0e0968bacd RCX: ffffffff804661d8
[311578.558988] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffff804661c0
[311578.580658] RBP: ffff810039fc2000 R08: 0000000000000002 R09: 0000000000000000
[311578.602317] R10: 0000000000000000 R11: ffff810002aec808 R12: ffffffff8039e204
[311578.623985] R13: ffff81003b2e7c48 R14: 0000000000000000 R15: ffffffff80152c90
[311578.645643] FS:  0000000000000000(0000) GS:ffffffff805fd080(0000) knlGS:0000000000000000
[311578.670184] CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
[311578.687672] CR2: 00002aaaaabe5093 CR3: 000000003d3f7000 CR4: 00000000000006e0
[311578.709338] Process pdflush (pid: 30788, threadinfo ffff8100307f0000, task ffff81003dbc6780)
[311578.734914] Stack: ffff810039fc2000 ffff81003edaa8b0 ffff8100031a00d0 ffffffff8021fbdb
[311578.758699]        ffff81003c480630 ffffffff802174a4 ffff81003edaa8b0 ffff810004764928
[311578.783015]        0000000000000286 ffffffff80217527
[311578.798449] Call Trace:<ffffffff8021fbdb>{_raw_spin_lock+25} <ffffffff802174a4>{cfq_exit_single_io_context+85}
[311578.828782]        <ffffffff80217527>{cfq_exit_io_context+33} <ffffffff8020d07d>{exit_io_context+137}
[311578.856762]        <ffffffff8013f937>{do_exit+183} <ffffffff80152c90>{keventd_create_kthread+0}
[311578.883192]        <ffffffff80110c25>{child_rip+15} <ffffffff80152c90>{keventd_create_kthread+0}
[311578.909852]        <ffffffff80152d86>{kthread+0} <ffffffff80110c16>{child_rip+0}
[311578.932353]
[311578.939431]
[311578.939432] Code: 44 8b 83 1c 01 00 00 48 8d 8b f8 02 00 00 8b 55 04 41 89 c1


Haven't managed to reproduce it since, but this came up a few weeks
ago, just before we released Fedora Core 5 test1  (We defaulted to
a different elevator for that test release just in case it blew up
during installation), since flipping it back on, it's behaved, until now.

		Dave

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