Comment 3 for bug 748709

And here is another one with the Natty kernel:

...although the message is different the call trace looks quite similar (shrink dcache vs. shrink icache)...

[97899.170400] BUG: unable to handle kernel NULL pointer dereference at 0000000000000070
[97899.177089] IP: [<ffffffff81038bd9>] __ticket_spin_lock+0x9/0x20
[97899.180017] PGD 1bacca067 PUD 1471b9067 PMD 0
[97899.180017] Oops: 0002 [#1] SMP
[97899.180017] last sysfs file: /sys/devices/pci0000:00/0000:00:14.4/0000:06:06.0/net/eth1/speed
[97899.180017] CPU 1
[97899.180017] Modules linked in: cdc_acm ip6table_filter ip6_tables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables parport_pc ppdev dm_crypt binfmt_misc snd_hda_codec_hdmi n
fs lockd fscache nfs_acl auth_rpcgss snd_hda_codec_realtek sunrpc snd_usb_audio kvm_amd snd_usbmidi_lib kvm snd_seq_midi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_rawmidi snd_seq_midi_event snd_seq joydev psmouse bridge snd_seq_device stp sp5100_tco i2c_piix4 serio_raw edac_core edac_mce_amd k10temp snd_timer snd usb_stora
ge uas it87 hwmon_vid snd_page_alloc soundcore lp parport hid_sony usbhid hid radeon ttm drm_kms_helper drm xhci_hcd pata_jmicron firewire_ohci i2c_algo_bit firewire_core crc_itu_t pata_atiixp e1000 ahci r8169 libahci
[97899.180017]
[97899.180017] Pid: 66, comm: kswapd0 Not tainted 2.6.38-10-generic #46-Ubuntu Gigabyte Technology Co., Ltd. GA-790XTA-UD4/GA-790XTA-UD4
[97899.180017] RIP: 0010:[<ffffffff81038bd9>] [<ffffffff81038bd9>] __ticket_spin_lock+0x9/0x20
[97899.180017] RSP: 0018:ffff88021b2abc80 EFLAGS: 00010202
[97899.180017] RAX: 0000000000010000 RBX: 0000000000000001 RCX: ffffffff81a3f120
[97899.180017] RDX: ffff88006d5884b8 RSI: 0000000000000080 RDI: 0000000000000070
[97899.180017] RBP: ffff88021b2abc80 R08: 00000000ffffffff R09: ffff8800cf97ee50
[97899.180017] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000070
[97899.180017] R13: ffff880035963e50 R14: ffff880035964010 R15: ffff88021b2abcf0
[97899.180017] FS: 00007fd6179f0780(0000) GS:ffff8800cfa40000(0000) knlGS:00000000f69cf880
[97899.180017] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[97899.180017] CR2: 0000000000000070 CR3: 00000001d998e000 CR4: 00000000000006e0
[97899.180017] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[97899.180017] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[97899.180017] Process kswapd0 (pid: 66, threadinfo ffff88021b2aa000, task ffff88021b2a16e0)
[97899.180017] Stack:
[97899.180017] ffff88021b2abc90 ffffffff815c311e ffff88021b2abcc0 ffffffff81195d5b
[97899.180017] ffff880035963e50 ffff880035963ec8 000000000000005a 0000000000000080
[97899.180017] ffff88021b2abd30 ffffffff8117eba4 0000000000000007 000000000000004b
[97899.180017] Call Trace:
[97899.180017] [<ffffffff815c311e>] _raw_spin_lock+0xe/0x20
[97899.180017] [<ffffffff81195d5b>] remove_inode_buffers+0x3b/0xb0
[97899.180017] [<ffffffff8117eba4>] prune_icache+0x1a4/0x2f0
[97899.180017] [<ffffffff8117ed45>] shrink_icache_memory+0x55/0x60
[97899.180017] [<ffffffff8111c76c>] shrink_slab+0x11c/0x180
[97899.180017] [<ffffffff8111f556>] balance_pgdat+0x2d6/0x6d0
[97899.180017] [<ffffffff8111fa93>] kswapd+0x143/0x1b0
[97899.180017] [<ffffffff8111f950>] ? kswapd+0x0/0x1b0
[97899.180017] [<ffffffff81087866>] kthread+0x96/0xa0
[97899.180017] [<ffffffff8100ce24>] kernel_thread_helper+0x4/0x10
[97899.180017] [<ffffffff810877d0>] ? kthread+0x0/0xa0
[97899.180017] [<ffffffff8100ce20>] ? kernel_thread_helper+0x0/0x10
[97899.180017] Code: 00 00 48 c7 c2 de 89 03 81 48 c7 c1 e1 89 03 81 e9 dd fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 55 b8 00 00 01 00 48 89 e5 <f0> 0f c1 07 0f b7 d0 c1 e8 10 39 c2 74 07 f3 90 0f b7 17 eb f5
[97899.180017] RIP [<ffffffff81038bd9>] __ticket_spin_lock+0x9/0x20
[97899.180017] RSP <ffff88021b2abc80>
[97899.180017] CR2: 0000000000000070
[97899.375191] ---[ end trace 455fc990db0719c9 ]---