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    SubjectRe: 2.6.18-rc4-mm1 BUG null pointer deref while saving a file
    Dave Kleikamp wrote:
    > On Wed, 2006-08-16 at 13:44 +0200, Helge Hafting wrote:
    >
    >> 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
    >>
    >
    > By any chance would you be using cifs? This looks just like the bug
    > that is fixed by this patch:
    > http://www.kernel.org/git/gitweb.cgi?p=linux/kernel/git/sfrench/cifs-2.6.git;a=commitdiff;h=e466e4876bf39474e15d0572f2204578137ae7f5
    >
    Yes, this is on cifs. I should have mentioned that. Is this patch going
    in anyway, or should I test it? I don't know a way of reproducing
    the problem.


    Helge Hafting
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