Comment 2 for bug 748709

This also affects me, but started just two days ago (2011-08-18).

I've also tried a different kernel (2.6.38 in Natty >>> 3.0.0 vanilla with custom config), however, with no change.

Up to now I was unable to say what causes this problem, but the call stack suspects kswapd once again (seems to be a source of a lot of problems since kernel 2.6.35).

This is the dmesg output:
[74528.204537] general protection fault: 0000 [#1] SMP
[74528.204631] CPU 2
[74528.204665] Modules linked in: binfmt_misc ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables dm_crypt ppdev nfs lockd auth_rpcgss nfs_acl sunrpc kvm_amd kvm snd_hda_codec_hdmi snd_hda_codec_realtek snd_usb_audio snd_usbmidi_lib snd_seq_dummy snd_hda_intel snd_seq_oss snd_hda_codec snd_seq_midi snd_hwdep snd_pcm_oss snd_rawmidi snd_mixer_oss snd_seq_midi_event usb_storage snd_pcm snd_seq snd_seq_device joydev uinput snd_timer snd it87 hwmon_vid psmouse sp5100_tco soundcore serio_raw k10temp snd_page_alloc i2c_piix4 bridge lp stp parport hid_sony usbhid hid e1000 pata_atiixp radeon pata_jmicron r8169 mii ttm xhci_hcd ahci libahci fbcon tileblit font bitblit softcursor drm_kms_helper drm i2c_algo_bit
[74528.205948]
[74528.205976] Pid: 32, comm: kswapd0 Not tainted 3.0.0-chaoz #8 Gigabyte Technology Co., Ltd. GA-790XTA-UD4/GA-790XTA-UD4
[74528.206152] RIP: 0010:[<ffffffff81171ec8>] [<ffffffff81171ec8>] iput+0x68/0x1c0
[74528.206281] RSP: 0018:ffff880220979b40 EFLAGS: 00010246
[74528.206366] RAX: 0000000000000001 RBX: ffff8800232af018 RCX: ffff8800232af0b8
[74528.206478] RDX: 0000000000000001 RSI: ffff8800232af038 RDI: ffff8800232af038
[74528.206590] RBP: ffff880220979b60 R08: 7018000000000000 R09: 017a1724b80c0000
[74528.206702] R10: fe67e939cdbd2e03 R11: ffffea0003e6c3c0 R12: ffff8800232af038
[74528.206814] R13: 8000000000000000 R14: ffff88002326d0c0 R15: ffff8800232af018
[74528.206928] FS: 00007f3095b52700(0000) GS:ffff88022fc80000(0000) knlGS:00000000f69a3880
[74528.207055] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[74528.207146] CR2: 0000000001cb5e40 CR3: 0000000220f59000 CR4: 00000000000006e0
[74528.207258] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[74528.207370] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[74528.207483] Process kswapd0 (pid: 32, threadinfo ffff880220978000, task ffff8802222d96d0)
[74528.207610] Stack:
[74528.207643] ffff88002326d180 ffff8800232af018 ffff88002326d0c0 ffff88002326d0c0
[74528.207768] ffff880220979b90 ffffffff8116e3f0 ffff880220979b90 ffff88002326d180
[74528.207892] ffff88002326d1dc ffff880220979c10 ffff880220979be0 ffffffff8116e5ad
[74528.208016] Call Trace:
[74528.208062] [<ffffffff8116e3f0>] d_kill+0x100/0x140
[74528.208145] [<ffffffff8116e5ad>] shrink_dentry_list+0x17d/0x1f0
[74528.208243] [<ffffffff8116e7ce>] __shrink_dcache_sb+0x1ae/0x1e0
[74528.208342] [<ffffffff8116e958>] shrink_dcache_memory+0x158/0x1d0
[74528.208445] [<ffffffff8110b05d>] shrink_slab+0x11d/0x190
[74528.208534] [<ffffffff8110e582>] balance_pgdat+0x572/0x720
[74528.208626] [<ffffffff8110e83d>] kswapd+0x10d/0x360
[74528.208709] [<ffffffff81081240>] ? wake_up_bit+0x40/0x40
[74528.208798] [<ffffffff8110e730>] ? balance_pgdat+0x720/0x720
[74528.208890] [<ffffffff81080ae6>] kthread+0x96/0xa0
[74528.208971] [<ffffffff81590824>] kernel_thread_helper+0x4/0x10
[74528.209068] [<ffffffff81080a50>] ? flush_kthread_worker+0xb0/0xb0
[74528.209167] [<ffffffff81590820>] ? gs_change+0x13/0x13
[74528.209249] Code: 4c 89 e6 e8 eb 1a 15 00 85 c0 75 17 48 8b 1c 24 4c 8b 64 24 08 4c 8b 6c 24 10 4c 8b 74 24 18 c9 c3 66 90 f6 43 28 08 4c 8b 6b 18 <4d> 8b 75 30 0f 85 19 01 00 00 4d 85 f6 74 79 49 8b 46 20 48 85
[74528.209678] RIP [<ffffffff81171ec8>] iput+0x68/0x1c0
[74528.209763] RSP <ffff880220979b40>
[74528.311450] ---[ end trace c8c5b5270fa56a91 ]---