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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1212818

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: raring

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https://bugs.launchpad.net/bugs/1212818

Title:
  Using fscache with NFS causes random kernel oops

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  It is hard to get an oops because the entire FS system seems to hang
  and /var/log/kern.log won't capture it.  I have managed to get a kdump
  capture. I think I told apport to submit the crash dump, but I'm not
  really sure if it worked, and I don't know where to look to see if it
  made it anyplace..

  fscache was working fine in oneiric at least, so this is a regression.

  I'm thinking this is probably the fix that needs to be backported:

  http://www.redhat.com/archives/linux-cachefs/2013-May/msg00008.html

  crash reports:

  [178619.012128] BUG: unable to handle kernel NULL pointer dereference at 000000000000000c
  [178619.012224] IP: [<ffffffff81044a99>] __ticket_spin_lock+0x9/0x30
  [178619.012303] PGD 0 
  [178619.012329] Oops: 0002 [#1] SMP 
  [178619.012369] Modules linked in: nfsv4(F) cachefiles(F) rfcomm bnep bluetooth autofs4(F) nfsd(F) auth_rpcgss(F) nfs_acl(F) nfs(F) lockd(F) sunrpc(F) fscache(F) nls_iso8859_1(F) snd_hda_codec_realtek snd_hda_codec_hdmi coretemp snd_hda_intel snd_hda_codec kvm_intel snd_hwdep(F) snd_pcm(F) kvm snd_page_alloc(F) snd_seq_midi(F) snd_seq_midi_event(F) snd_rawmidi(F) snd_seq(F) snd_seq_device(F) snd_timer(F) snd(F) soundcore(F) tpm_infineon ghash_clmulni_intel(F) aesni_intel(F) aes_x86_64(F) i915 xts(F) lrw(F) gf128mul(F) hp_wmi psmouse(F) drm_kms_helper drm ablk_helper(F) cryptd(F) microcode(F) i2c_algo_bit serio_raw(F) sparse_keymap mac_hid wmi tpm_tis lpc_ich ppdev(F) video(F) parport_pc(F) iTCO_wdt iTCO_vendor_support lp(F) parport(F) hid_generic usbhid hid ahci(F) libahci(F) e1000e(F)
  [178619.013231] CPU 4 
  [178619.013257] Pid: 21461, comm: kworker/u:0 Tainted: GF          O 3.8.0-27-generic #40-Ubuntu Hewlett-Packard HP EliteDesk 800 G1 SFF/1998
  [178619.013372] RIP: 0010:[<ffffffff81044a99>]  [<ffffffff81044a99>] __ticket_spin_lock+0x9/0x30
  [178619.013460] RSP: 0018:ffff88034e9c9ce0  EFLAGS: 00010287
  [178619.013512] RAX: 0000000000010000 RBX: ffff8803ef5c92c0 RCX: ffffffff81e4fc10
  [178619.013579] RDX: 0000000000000001 RSI: 0000000000000005 RDI: 000000000000000c
  [178619.013669] RBP: ffff88034e9c9ce0 R08: 0000000000000000 R09: ffffffff81e4fb70
  [178619.013749] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000030
  [178619.013816] R13: 000000000000000c R14: ffffffff81e4fb60 R15: ffffffff81e4fa00
  [178619.013895] FS:  0000000000000000(0000) GS:ffff88041eb00000(0000) knlGS:0000000000000000
  [178619.013997] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [178619.014064] CR2: 000000000000000c CR3: 0000000002c0d000 CR4: 00000000001407e0
  [178619.014132] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [178619.014199] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  [178619.014267] Process kworker/u:0 (pid: 21461, threadinfo ffff88034e9c8000, task ffff8803b99cdd00)
  [178619.014364] Stack:
  [178619.014398]  ffff88034e9c9cf0 ffffffff816cc97e ffff88034e9c9da0 ffffffffa02cc598
  [178619.014483]  ffff880406319c00 ffff88034e9c9d20 ffffffff8108f393 ffff8803ef5c9340
  [178619.014576]  ffff88034e9c9d30 ffffffff81074c74 ffff88034e9c9d40 ffffffff81074d14
  [178619.014660] Call Trace:
  [178619.014698]  [<ffffffff816cc97e>] _raw_spin_lock+0xe/0x20
  [178619.014762]  [<ffffffffa02cc598>] fscache_invalidate_writes+0x28/0xc0 [fscache]
  [178619.014839]  [<ffffffff8108f393>] ? wake_up_process+0x23/0x40
  [178619.014927]  [<ffffffff81074c74>] ? wake_up_worker+0x24/0x30
  [178619.014985]  [<ffffffff81074d14>] ? insert_work+0x94/0xb0
  [178619.015043]  [<ffffffff8107725a>] ? __queue_work+0xea/0x370
  [178619.015111]  [<ffffffffa02c8f6f>] fscache_object_state_machine+0x6f/0xa30 [fscache]
  [178619.015192]  [<ffffffffa02c995b>] fscache_object_work_func+0x2b/0x60 [fscache]
  [178619.015263]  [<ffffffff8107682c>] process_one_work+0x15c/0x4d0
  [178619.015325]  [<ffffffff8107808e>] worker_thread+0x16e/0x480
  [178619.015418]  [<ffffffff81077f20>] ? manage_workers+0x2a0/0x2a0
  [178619.015491]  [<ffffffff8107d420>] kthread+0xc0/0xd0
  [178619.015558]  [<ffffffff8107d360>] ? kthread_create_on_node+0x120/0x120
  [178619.015662]  [<ffffffff816d516c>] ret_from_fork+0x7c/0xb0
  [178619.015728]  [<ffffffff8107d360>] ? kthread_create_on_node+0x120/0x120
  [178619.015790] Code: 00 00 48 c7 c1 a1 48 04 81 48 c7 c2 9e 48 04 81 e9 dd fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 b8 00 00 01 00 48 89 e5 <f0> 0f c1 07 89 c1 c1 e9 10 66 39 c1 89 ca 74 11 0f 1f 80 00 00 
  [178619.016207] RIP  [<ffffffff81044a99>] __ticket_spin_lock+0x9/0x30
  [178619.016302]  RSP <ffff88034e9c9ce0>
  [178619.016338] CR2: 000000000000000c

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