Re: 2.6.18-rc4-mm1 BUG null pointer deref while saving a file

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Aug 16 13:20:30 hh kernel: BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000
Aug 16 13:20:30 hh kernel:  printing eip:
Aug 16 13:20:30 hh kernel: c0468863
Aug 16 13:20:30 hh kernel: *pde = 00000000
Aug 16 13:20:30 hh kernel: Oops: 0002 [#1]
Aug 16 13:20:30 hh kernel: 4K_STACKS
Aug 16 13:20:30 hh kernel: last sysfs file: /devices/platform/i2c-9191/9191-0290/in0_input
Aug 16 13:20:30 hh kernel: CPU:    0
Aug 16 13:20:30 hh kernel: EIP:    0060:[<c0468863>]    Not tainted VLI
Aug 16 13:20:30 hh kernel: EFLAGS: 00010002   (2.6.18-rc4-mm1 #7)
Aug 16 13:20:30 hh kernel: EIP is at __down+0x5c/0xed
Aug 16 13:20:30 hh kernel: eax: 00000000 ebx: d462e7e4 ecx: c14e7e40 edx: dde06f0c Aug 16 13:20:30 hh kernel: esi: 00000286 edi: c3365550 ebp: d462e7ec esp: dde06efc
Aug 16 13:20:30 hh kernel: ds: 007b   es: 007b   ss: 0068
Aug 16 13:20:30 hh kernel: Process lyx (pid: 9353, ti=dde06000 task=c3365550 task.ti=dde06000) Aug 16 13:20:30 hh kernel: Stack: dde06f0c 00000001 c3365550 c0116941 d462e7ec 00000000 00000008 d851a9a8 Aug 16 13:20:30 hh kernel: d462e7c0 d32a1200 c0466bc7 c14e7e40 dde06000 c01ed987 00000008 00000000 Aug 16 13:20:30 hh kernel: 00000000 00000000 d7a31c00 caf9be0c 00000000 00001dbb d462e7e4 00000008
Aug 16 13:20:30 hh kernel: Call Trace:
Aug 16 13:20:30 hh kernel:  [<c0466bc7>] __down_failed+0x7/0xc
Aug 16 13:20:30 hh kernel: DWARF2 unwinder stuck at __down_failed+0x7/0xc
Aug 16 13:20:31 hh kernel: Leftover inexact backtrace:
Aug 16 13:20:31 hh kernel:  [<c01ed987>] .text.lock.file+0x54/0x9d
Aug 16 13:20:31 hh kernel:  [<c01516bd>] __fput+0xb2/0x163
Aug 16 13:20:31 hh kernel:  [<c014ee9d>] filp_close+0x3e/0x62
Aug 16 13:20:31 hh kernel:  [<c0150168>] sys_close+0x5c/0x6b
Aug 16 13:20:31 hh kernel:  [<c01028c9>] sysenter_past_esp+0x56/0x79
Aug 16 13:20:31 hh kernel:  =======================
Aug 16 13:20:31 hh kernel: Code: 0c 41 69 11 c0 c7 07 02 00 00 00 9c 5e fa 83 4c 24 04 01 8d 6b 08 8b 45 04 8d 54 24 10 89 14 24 89 55 04 89 6c 24 10 89 44 24 14 <89> 10 8b 43 04 8d 50 01 89 53 04 01 03 0f 98 c0 84 c0 74 26 c7 Aug 16 13:20:31 hh kernel: EIP: [<c0468863>] __down+0x5c/0xed SS:ESP 0068:dde06efc

The lyx process is a word processor.  I did a save, the window
disappeared, and this was logged.

Helge Hafting
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