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SubjectRegular System Crash
Date
Hello everyone...

I have a heavily loaded server, and it crashes every now and then, about
once a day. I usually get no messages, but today I got this one in my
syslog:

-----<syslog>-----
Apr 26 12:10:53 scorpio kernel: kmem_free: Bad obj addr (objp=c4bcb860,
name=buffer_head)
Apr 26 12:10:53 scorpio kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000000
Apr 26 12:10:53 scorpio kernel: current->tss.cr3 = 00101000, %cr3 =
00101000
Apr 26 12:10:53 scorpio kernel: *pde = 00000000
-----</syslog>-----

And dmesg shows this:

-----<demsg>-----
kmem_free: Bad obj addr (objp=c4bcb860, name=buffer_head)
Unable to handle kernel NULL pointer dereference at virtual address
00000000
current->tss.cr3 = 00101000, %cr3 = 00101000
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0010:[<c011d8dd>]
EFLAGS: 00010286
eax: 0000003d ebx: c04ad740 ecx: 00000002 edx: cfc8a000
esi: c4bcb860 edi: c4bcb8c0 ebp: 00000286 esp: c000ff5c
ds: 0018 es: 0018 ss: 0018
Process kswapd (pid: 4, process nr: 4, stackpage=c000f000)
Stack: c4bcb8c0 c02e56f0 c04ad2c0 c00986a0 00000018 00000216 c4b76000
ffffffff
c0123555 c04ad740 c4bcb860 c4bcb860 c4bcb8c0 c0123e87 c4bcb860
c4bcb860
c02e56f0 00000001 000003fe c000e000 c01198f6 c02e56f0 00000002
00000006
Call Trace: [<c0123555>] [<c0123e87>] [<c01198f6>] [<c011e4bf>]
[<c01ca6cd>] [<c011e567>] [<c010733f>]
Code: c7 05 00 00 00 00 00 00 00 00 eb 12 8d 76 00 53 56 68 29 a5
-----</demsg>-----

I have no clue what may be wrong. Any hint what could cause this?

Jens Knoell


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