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Old 06-26-2008, 07:33 AM   #1
asadmahmand
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Registered: Oct 2007
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System hang


linux kernel 2.4.22-1.2199.nptl
my system is hanged today and i needed to restart it. then found this in logs.

Jun 25 16:45:17 ccdrive kernel: CPU: 0
Jun 25 16:45:17 ccdrive kernel: EIP: 0060:[<c01266f9>] Not tainted
Jun 25 16:45:18 ccdrive kernel: EFLAGS: 00010202
Jun 25 16:45:18 ccdrive kernel:
Jun 25 16:45:18 ccdrive kernel: EIP is at free_uid [kernel] 0x29 (2.4.22-1.2199.nptl)
Jun 25 16:45:18 ccdrive kernel: eax: 00000000 ebx: c033f7bc ecx: c033f7c8 edx: 00000000
Jun 25 16:45:18 ccdrive kernel: esi: 00000234 edi: 00000000 ebp: 00000234 esp: f0487f84
Jun 25 16:45:18 ccdrive kernel: ds: 0068 es: 0068 ss: 0068
Jun 25 16:45:18 ccdrive kernel: Process procmail (pid: 22406, stackpage=f0487000)
Jun 25 16:45:19 ccdrive kernel: Stack: 00000000 00000234 f0486000 c012a288 c033f7bc 00000000 00000000 c012a367
Jun 25 16:45:20 ccdrive kernel: 00000234 00000000 00000000 f0486000 0805827e 00000002 bfed0458 c0109747
Jun 25 16:45:21 ccdrive kernel: 00000234 ffffffff 00825238 0805827e 00000002 bfed0458 000000cb 0000002b
Jun 25 16:45:22 ccdrive kernel: Call Trace: [<c012a288>] set_user [kernel] 0x58 (0xf0487f90)
Jun 25 16:45:22 ccdrive kernel: [<c012a367>] sys_setreuid [kernel] 0xc7 (0xf0487fa0)
Jun 25 16:45:23 ccdrive kernel: [<c0109747>] system_call [kernel] 0x33 (0xf0487fc0)
Jun 25 16:45:23 ccdrive kernel:
Jun 25 16:45:23 ccdrive kernel:
Jun 25 16:45:23 ccdrive kernel: Code: 89 50 04 89 02 c7 41 04 00 00 00 00 c7 43 0c 00 00 00 00 a1
Jun 25 16:45:33 ccdrive kernel: <1>Unable to handle kernel NULL pointer dereference at virtual address 00000004
Jun 25 16:45:33 ccdrive kernel: printing eip:
Jun 25 16:45:33 ccdrive kernel: c01266f9
Jun 25 16:45:33 ccdrive kernel: *pde = 2cdc9067
Jun 25 16:45:33 ccdrive kernel: *pte = 00000000
Jun 25 16:45:33 ccdrive kernel: Oops: 0002
Jun 25 16:45:33 ccdrive kernel: iptable_filter ip_tables sis900 microcode keybdev mousedev hid input ehci-hcd usb-ohci usbcore ext3 jbd raid1


the system is working fine now. just curious why did this happend and to be prepared for future.
Can someone answer, is it a hardwar issue or anything wrong in my applications. and how to solve it. (replace RAM or Harddisk)???

Last edited by asadmahmand; 06-26-2008 at 07:54 AM. Reason: for got to mention system is fine now
 
Old 06-27-2008, 12:42 AM   #2
Mega Man X
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If you google for "Unable to handle kernel NULL pointer dereference", you will see that several places are reporting that as a bug on the kernel, so I doubt you have faunty hardware. If you still believe it is hardware related, do a mem check to see if you RAM is okey.

This is a very rare occurrence with Linux. You don't see Linux crashing everyday, it usually is very stable. Which distribution are you running by the way? By the logs, it looks like Fedora =)
 
Old 06-27-2008, 01:18 AM   #3
Mr. C.
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Without further investigation, it is difficult to know exactly what went wrong. It could be a kernel bug, or it could be faulty hardware (eg. bad RAM), overheating, or even a corrupt file system.

The NULL pointer deference simply means that kernel code was executing and an instruction tried to use memory location 0 as an offset to where additional instruction data is stored. This occurs under any of a number of different circumstances, but *should* never happen. Unfortunately, due to bugs or hardware issues, it does happen occasionally.

Standard advice, continue to watch for repeat problems - if it does repeat, then it is time to start narrowing down the possibilities, through research, analysys, trial and error, and often a bit of luck.
 
  


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