[BUG]: fsnotify oops on 3.5.2

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Hi.

Last night I had a kernel oops in fsnotify (see attached). It happened
when I clicked a hyperlink to a text file in Firefox (which normally
opens an open-with/save-file dialog).

I've not found a way to reproduce.

The system runs kernel 3.5.2 with ext3. (note: kernel is patched with
overlayfs-v13).

Many thanks for your assistance.

~ Andy

==
BUG: unable to handle kernel NULL pointer dereference at 00000064
IP: [<c1109b7d>] fsnotify+0x8b/0x270
*pde = 00000000
Oops: 0000 [#1]
Pid: 14083, comm: firefox Tainted: G O 3.5.2
EIP: 0060:[<c1109b7d>] EFLAGS: 00210246 CPU: 0
EIP is at fsnotify+0x8b/0x270
EAX: 00000000 EBX: fffffff0 ECX: f5988910 EDX: f5988910
ESI: 00000010 EDI: 00000000 EBP: dea1de5c ESP: dea1de14
DS: 007b ES: 007b FS: 0000 GS: 00e0 SS: 0068
CR0: 80050033 CR2: 00000064 CR3: 34c52000 CR4: 000007d0
DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
DR6: ffff0ff0 DR7: 00000400
Process firefox (pid: 14083, ti=dea1c000 task=ed2d1880 task.ti=dea1c000)
Stack:
dea1de34 c10ee498 00000000 dea1deec dea1df78 00008000 00000001 c10f21c3
eeb43688 f5988910 00000010 dea1de48 00000000 00000000 00000000 eeb43680
00000010 f6003600 dea1de8c c10de255 00000001 00000000 00000000 00000000
Call Trace:
[<c10ee498>] ? dput+0x156/0x1c5
[<c10f21c3>] ? mntput+0x19/0x28
[<c10de255>] fput+0x196/0x1ed
[<c10e5435>] release_open_intent+0x1d/0x29
[<c10e8b03>] path_openat+0xc5/0x33f
[<c10e8e41>] do_filp_open+0x2a/0x79
[<c10f105e>] ? alloc_fd+0x5c/0xcb
[<c10e538a>] ? getname_flags+0x31/0xb1
[<c10dc553>] do_sys_open+0xef/0x1da
[<c10dc692>] sys_open+0x27/0x2f
[<c1573f13>] sysenter_do_call+0x12/0x22
[<c1560000>] ? netlbl_mgmt_add_common+0x1ec/0x306
Code: 02 00 00 b8 20 82 93 c1 e8 41 35 f4 ff 89 45 d0 8b 4d dc 85 b1 24 01 00 00 0f 85 2b 01 00 00 85 db 0f 84 37 01 00 00 85 ff 75 09 <85> 73 74 0f 84 2a 01 00 00 8b 43 70 89 45 ec 8b 4d dc 8b 91 28
EIP: [<c1109b7d>] fsnotify+0x8b/0x270 SS:ESP 0068:dea1de14
CR2: 0000000000000064
---[ end trace b9a1d764aab1963e ]---

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