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SubjectRe: ext3 / reiserfs data corruption, 2.5-bk; NULL pointer dereference bug
I just saw another one of these NULL pointer dereference oops on my
laptop:

Unable to handle kernel NULL pointer dereference at virtual address 00000000
printing eip:
c01665f3
*pde = 00000000
Oops: 0000 [#1]
CPU: 0
EIP: 0060:[__d_lookup+99/256] Not tainted
EFLAGS: 00210282
EIP is at __d_lookup+0x63/0x100
eax: 00000000 ebx: c06ef980 ecx: 00000010 edx: dfe80000
esi: dfe8da40 edi: 00000000 ebp: df85be70 esp: db047ec8
ds: 007b es: 007b ss: 0068
Process gcc (pid: 4738, threadinfo=db046000 task=c22198c0)
Stack: dcfcc014 c012a225 00000000 00000000 dfe8da40 db047f48 00000000 dcfcc001
0029e101 00000003 dcfcc001 db047f90 dfff4fc0 db047f3c c015cf80 dfd50e00
db047f44 c015cb64 dcfcc001 dcfcc005 db047f3c db047f44 c015d129 db047f90
Call Trace:
[in_group_p+37/48] in_group_p+0x25/0x30
[do_lookup+48/176] do_lookup+0x30/0xb0
[permission+84/112] permission+0x54/0x70
[link_path_walk+297/2000] link_path_walk+0x129/0x7d0
[__user_walk+73/96] __user_walk+0x49/0x60
[sys_access+129/320] sys_access+0x81/0x140
[syscall_call+7/11] syscall_call+0x7/0xb

Code: 0f 18 00 90 8b 74 24 10 8d 5d 90 39 73 78 75 17 8b 7b 58 89

I ran memtest86 for about 14 hours and it passed all of its tests. I
enabled the memory debugging options (under the kernel hacking
section) and I did not notice any errors displayed by it in my syslog.

I'm not sure what else to try... The backtrace is signifigantly
different that the last one...

On Tue, Jun 10, 2003 at 01:59:35PM -0700, Andrew Morton wrote:
> Nathan Conrad <conrad@bungled.net> wrote:
> >
> > Unable to handle kernel NULL pointer dereference at virtual address 00000000
> > printing eip:
> > c016781a
> > *pde = 00000000
> > Oops: 0000 [#1]
> > CPU: 0
> > EIP: 0060:[find_inode_fast+26/96] Not tainted
>
> Something scribbled on your inode hash chains. Please make sure that
> you're building the kernel with all the memory debug options enabled, and
> run memtest86 on that machine for 12 hourws or so.

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