Public bug reported:
This happened probably on NFSv4, but I'm not sure if it is related here.
Based on the stack trace it does not seem so.
linux-image-3.5.0-17-generic
Oct 26 17:40:32 fsdevel7 kernel: [345346.770480] BUG: unable to handle kernel
NULL pointer dereference at 0000000000000068
Oct 26 17:40:32 fsdevel7 kernel: [345346.772356] IP: [<ffffffff812ed2d4>]
common_file_perm+0x14/0xf0
Oct 26 17:40:32 fsdevel7 kernel: [345346.773329] PGD 3b1aef067 PUD 42350e067
PMD 0
Oct 26 17:40:32 fsdevel7 kernel: [345346.774298] Oops: 0000 [#1] SMP
Oct 26 17:40:32 fsdevel7 kernel: [345346.775258] CPU 1
Oct 26 17:40:32 fsdevel7 kernel: [345346.775265] Modules linked in: uas
usb_storage xfs xt_state iptable_filter ipt_MASQUERADE iptable_nat nf_nat
nf_conntrac
k_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables cachefiles bridge stp
dm_crypt llc bnep rfcomm bluetooth snd_hda_codec_conexant parport_pc gpio_ich
ppd
ev snd_hda_intel lp snd_hda_codec snd_hwdep snd_pcm parport snd_seq_midi
snd_rawmidi kvm_intel kvm snd_seq_midi_event tpm_infineon snd_seq hid_generic
snd_ti
mer lpc_ich snd_seq_device snd tpm_tis mei dm_multipath soundcore
snd_page_alloc joydev mac_hid scsi_dh serio_raw microcode nfsd nfs lockd
fscache auth_rpcgs
s sch5636 nfs_acl sch56xx_common sunrpc coretemp binfmt_misc raid10 raid456
async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx raid1
rai
d0 multipath linear btrfs zlib_deflate libcrc32c hid_microsoft usbhid hid i915
ghash_clmulni_intel aesni_intel drm_kms_helper cryptd aes_x86_64 drm i2c_algo_
bit video e1000e
Oct 26 17:40:32 fsdevel7 kernel: [345346.780712]
Oct 26 17:40:32 fsdevel7 kernel: [345346.781873] Pid: 93817, comm: hg Not
tainted 3.5.0-17-generic #28-Ubuntu FUJITSU ESPRIMO P900/D3062-A1
Oct 26 17:40:32 fsdevel7 kernel: [345346.783071] RIP: 0010:[<ffffffff812ed2d4>]
[<ffffffff812ed2d4>] common_file_perm+0x14/0xf0
Oct 26 17:40:32 fsdevel7 kernel: [345346.784275] RSP: 0018:ffff880334a9fe88
EFLAGS: 00010282
Oct 26 17:40:32 fsdevel7 kernel: [345346.785480] RAX: 0000000000000000 RBX:
ffff8802d9a87300 RCX: 0000000000000000
Oct 26 17:40:32 fsdevel7 kernel: [345346.786691] RDX: 0000000000000004 RSI:
ffff8802d9a87300 RDI: 0000000000000010
Oct 26 17:40:32 fsdevel7 kernel: [345346.787898] RBP: ffff880334a9fe88 R08:
000000000161ce24 R09: 00007f9241653700
Oct 26 17:40:32 fsdevel7 kernel: [345346.789109] R10: 0000000000000022 R11:
0000000000000246 R12: 0000000000000004
Oct 26 17:40:32 fsdevel7 kernel: [345346.790330] R13: 0000000000000000 R14:
ffff880334a9ff50 R15: 00007f923f68f0d0
Oct 26 17:40:32 fsdevel7 kernel: [345346.791549] FS: 00007f9241653700(0000)
GS:ffff88043e280000(0000) knlGS:0000000000000000
Oct 26 17:40:32 fsdevel7 kernel: [345346.792771] CS: 0010 DS: 0000 ES: 0000
CR0: 0000000080050033
Oct 26 17:40:32 fsdevel7 kernel: [345346.793995] CR2: 0000000000000068 CR3:
00000002d3b3c000 CR4: 00000000000427e0
Oct 26 17:40:32 fsdevel7 kernel: [345346.795231] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Oct 26 17:40:32 fsdevel7 kernel: [345346.796468] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
Oct 26 17:40:32 fsdevel7 kernel: [345346.796469] Process hg (pid: 93817,
threadinfo ffff880334a9e000, task ffff880422b4dc00)
Oct 26 17:40:32 fsdevel7 kernel: [345346.796469] Stack:
Oct 26 17:40:32 fsdevel7 kernel: [345346.796470] ffff880334a9fe98
ffffffff812ed4a8 ffff880334a9fec8 ffffffff812b2bac
Oct 26 17:40:32 fsdevel7 kernel: [345346.796472] ffff880334a9ff08
0000000000100000 ffff8802d9a87300 0000000000000000
Oct 26 17:40:32 fsdevel7 kernel: [345346.796473] ffff880334a9fef8
ffffffff81181d21 0000000000000001 ffff8802d9a87300
Oct 26 17:40:32 fsdevel7 kernel: [345346.796475] Call Trace:
Oct 26 17:40:32 fsdevel7 kernel: [345346.796476] [<ffffffff812ed4a8>]
apparmor_file_permission+0x18/0x20
Oct 26 17:40:32 fsdevel7 kernel: [345346.796477] [<ffffffff812b2bac>]
security_file_permission+0x2c/0xb0
Oct 26 17:40:32 fsdevel7 kernel: [345346.796479] [<ffffffff81181d21>]
rw_verify_area+0x61/0xf0
Oct 26 17:40:32 fsdevel7 kernel: [345346.796482] [<ffffffff8118218e>]
vfs_read+0x7e/0x180
Oct 26 17:40:32 fsdevel7 kernel: [345346.796483] [<ffffffff811822da>]
sys_read+0x4a/0x90
Oct 26 17:40:32 fsdevel7 kernel: [345346.796484] [<ffffffff81689d29>]
system_call_fastpath+0x16/0x1b
Oct 26 17:40:32 fsdevel7 kernel: [345346.796487] Code: b3 94 ff ff 48 8b 5d e8
4c 8b 65 f0 4c 8b 6d f8 c9 c3 e8 ba d5 38 00 55 48 89 e5 66 66 66 66 90 48 8b
46 68 48 8b 8e 98 00 00 00 <48> 8b 40 68 48 85 c0 0f 84 c0 00 00 00 4c 8b 00 4d
85 c0 75 0a
Oct 26 17:40:32 fsdevel7 kernel: [345346.796502] RIP [<ffffffff812ed2d4>]
common_file_perm+0x14/0xf0
Oct 26 17:40:32 fsdevel7 kernel: [345346.796503] RSP <ffff880334a9fe88>
Oct 26 17:40:32 fsdevel7 kernel: [345346.796504] CR2: 0000000000000068
Oct 26 17:40:32 fsdevel7 kernel: [345346.820250] ---[ end trace
1947d4cd7cbc7226 ]---
Oct 26 17:40:32 fsdevel7 kernel: [345346.820955] VFS: Close: file count is 0
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1071806
Title:
NULL pointer dereference in common_file_perm+0x14
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