Subj : Wierd bug in kernels.
To   : comp.os.linux
From : Hans Joergensen
Date : Mon Sep 13 2004 11:00 pm

Hello,

I have run into a wierd problem on a VIA C3-powered box.

The system is Debian Stable, with libc from testing.

It started with kernel 2.4.25 (or so) and the problem is that when i
compile say a 2.4.27 with the same configuration as my old 2.4.20
the kernel boots fine, but some commands like ls behave
wierd..

ls works, but ls -l segfaults..

Below is what the kernel tells me when this happens, put through
ksymoops.

I first thought that the system might be compromised, but since it
lives on a private network thats a bit unlikely, and
debsums+chkrootkit don't find anything.

Anyone seen anything like this?

// Hans

 <1>Unable to handle kernel paging request at virtual address 08e8c358
08e8c358
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0010:[<08e8c358>]    Not tainted
EFLAGS: 00010293
eax: 00000109   ebx: ce380000   ecx: bfffe9e0   edx: 00000018
esi: 00000016   edi: ffffffff   ebp: bfffe9c8   esp: ce381fc0
ds: 0018   es: 0018   ss: 0018
Process ls (pid: 366, stackpage=ce381000)
Stack: c0106d1f 00000000 bfffe9e0 40022214 00000016 ffffffff
bfffe9c8 00000109
       0000002b 0000002b 00000109 4001fe66 00000023 00000246
bfffe9ac 0000002b
Call Trace:    [<c0106d1f>]
Code:  Bad EIP value.


>>EIP; 08e8c358 Before first symbol   <=====

>>ebx; ce380000 <_end+e0a3b8c/fd81b8c>
>>ecx; bfffe9e0 Before first symbol
>>edi; ffffffff <END_OF_CODE+2ff5eae0/????>
>>ebp; bfffe9c8 Before first symbol
>>esp; ce381fc0 <_end+e0a5b4c/fd81b8c>

Unable to handle kernel paging request at virtual address 08e8c358
08e8c358
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0010:[<08e8c358>]    Not tainted
EFLAGS: 00010293
eax: 00000109   ebx: cd408000   ecx: bffffd58   edx: 00000018
esi: 00000016   edi: ffffffff   ebp: bffffce8   esp: cd409fc0
ds: 0018   es: 0018   ss: 0018
Process sleep (pid: 531, stackpage=cd409000)
Stack: c0106d1f 00000000 bffffd58 40044214 00000016 ffffffff
bffffce8 00000109
       0000002b 0000002b 00000109 40041e66 00000023 00000246
bffffccc 0000002b
Call Trace:    [<c0106d1f>]
Code:  Bad EIP value.


>>EIP; 08e8c358 Before first symbol   <=====

>>ebx; cd408000 <_end+d12bb8c/fd81b8c>
>>ecx; bffffd58 Before first symbol
>>edi; ffffffff <END_OF_CODE+2ff5eae0/????>
>>ebp; bffffce8 Before first symbol
>>esp; cd409fc0 <_end+d12db4c/fd81b8c>

Trace; c0106d1f <system_call+33/38>

 <1>Unable to handle kernel paging request at virtual address 58c0106d
58c0106d
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0010:[<58c0106d>]    Not tainted
EFLAGS: 00010293
eax: 0000010c   ebx: cd2a2000   ecx: 00000054   edx: 00000018
esi: bffff490   edi: 4014b570   ebp: bffff478   esp: cd2a3fc0
ds: 0018   es: 0018   ss: 0018
Process df (pid: 555, stackpage=cd2a3000)
Stack: c0106d1f 08051af8 00000054 bffff490 bffff490 4014b570
bffff478 0000010c
       0000002b 0000002b 0000010c 400e5354 00000023 00000246
bffff420 0000002b
Call Trace:    [<c0106d1f>]
Code:  Bad EIP value.


>>EIP; 58c0106d Before first symbol   <=====

>>ebx; cd2a2000 <_end+cfc5b8c/fd81b8c>
>>esi; bffff490 Before first symbol
>>edi; 4014b570 Before first symbol
>>ebp; bffff478 Before first symbol
>>esp; cd2a3fc0 <_end+cfc7b4c/fd81b8c>

.