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SubjectKernel oops 2.2.17
Date

Hi,

We run a heavily accessed Apache 1.3.6 Web server on a Redhat 6.0 distro
over 2.2.17. We upgraded from 2.2.16 and I now got some kernel oops.

System is :

AMD Athlon 600 Mhz.
512 MB RAM.
gcc version egcs-2.91.66
glibc 2.1.3-21

Kernel tweaks :

echo 1 > /proc/sys/net/ipv4/tcp_syncookies
echo 1 > /proc/sys/net/ipv4/conf/all/hidden
echo 1 > /proc/sys/net/ipv4/conf/lo/hidden
echo 60 > /proc/sys/net/ipv4/tcp_fin_timeout
echo 16384 > /proc/sys/fs/file-max
echo 32768 > /proc/sys/fs/inode-max


I had 5 kernel Oops on the "tar" process every day. (it starts a backup
every morning). Then, the master httpsd stops working and could not be
killed (even with kill -9 !).

Something strange is that it crashed at the same virtual address :

Dec 5 06:03:20 trinity kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000010
Dec 6 06:03:01 trinity kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000010
Dec 7 06:03:06 trinity kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000010
Dec 7 17:01:54 trinity kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000010
Dec 8 06:03:02 trinity kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000010


Here's the output from ksymoops for the httpsd crash.

-----------------------
No modules in ksyms, skipping objects
Warning, no symbols in lsmod, is /proc/modules a valid lsmod file?
Dec 7 17:01:54 trinity kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000010
Dec 7 17:01:54 trinity kernel: current->tss.cr3 = 03f00000, %%cr3 =
03f00000
Dec 7 17:01:54 trinity kernel: *pde = 00000000
Dec 7 17:01:54 trinity kernel: Oops: 0000
Dec 7 17:01:54 trinity kernel: CPU: 0
Dec 7 17:01:54 trinity kernel: EIP:
0010:[update_vm_cache_conditional+138/328]
Dec 7 17:01:54 trinity kernel: EFLAGS: 00010202
Dec 7 17:01:54 trinity kernel: eax: 00000000 ebx: cb255ed0 ecx:
00000008 edx: 00000008
Dec 7 17:01:54 trinity kernel: esi: 00000000 edi: 0001ffff ebp:
00000400 esp: c1fb5e9c
Dec 7 17:01:54 trinity kernel: ds: 0018 es: 0018 ss: 0018
Dec 7 17:01:54 trinity kernel: Process httpsd (pid: 21775, process nr: 127,
stackpage=c1fb5000)
Dec 7 17:01:54 trinity kernel: Stack: cb255ed0 cf1d0c00 00000008 0cb255ed
c0138ba1 cb255ed0 0000d000 cf1d0c00
Dec 7 17:01:54 trinity kernel: 00000400 40349000 cf66f660 ffffffea
cb255f1c 00001000 c9bf8300 c9bf8300
Dec 7 17:01:54 trinity kernel: c9bf8300 c1fb5f08 0000d000 00000000
00000000 00000000 dd6b9a00 00000000
Dec 7 17:01:54 trinity kernel: Call Trace: [ext2_file_write+1045/1572]
[__kfree_skb+161/168] [boomerang_interrupt+700/908] [u
Dec 7 17:01:54 trinity kernel: Code: 39 59 08 75 e1 8b 5c 24 20 39 59 0c 75
d8 ff 41 14 b8 02 00
Warning: trailing garbage ignored on Code: line
Text: 'Code: 39 59 08 75 e1 8b 5c 24 20 39 59 0c 75 d8 ff 41 14 b8 02 00
'
Garbage: ' '

Code: 00000000 Before first symbol 00000000 <_IP>: <===
Code: 00000000 Before first symbol 0: 39 59 08
cmpl %ebx,0x8(%ecx) <===
Code: 00000003 Before first symbol 3: 75 e1
jne ffffffe6 <END_OF_CODE+3fdb01be/????>
Code: 00000005 Before first symbol 5: 8b 5c 24 20
movl 0x20(%esp,1),%ebx
Code: 00000009 Before first symbol 9: 39 59 0c
cmpl %ebx,0xc(%ecx)
Code: 0000000c Before first symbol c: 75 d8
jne ffffffe6 <END_OF_CODE+3fdb01be/????>
Code: 0000000e Before first symbol e: ff 41 14
incl 0x14(%ecx)
Code: 00000011 Before first symbol 11: b8 02 00 00 00
movl $0x2,%eax


5 warnings issued. Results may not be reliable.

-----------------------



Do you have any idea of the problem ?

Regards,

Jean-Francois Nadeau
Network Administrator at Microflex
(418)694-2300 ext.141

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