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Old 04-07-2008, 07:51 AM   #1
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Registered: Aug 2007
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Post Kernel(2.4.17) Panic in timer_bh() function

Hello All,

Recently i had one kernel Panic in my system(2.4.17 kernel version) during shutdown -h 0(halt).After that i am trying to analyse my crash.When i go through the kernel stack,i have found the following frames in my the kernel stack.

---> timer_bh()
---> tasklet_hi_action()
----> do_softirq()
-----> do_IRQ()
-----> sys_reboot()

From my analysis timer_bh() function is called as a bottom halves function due to timer interrupt(found in do_IRQ();IRQ0 is enabled).

Kernel Crash happening in the timer_bh() function.After that when i tried to dump the struct pt_regs during the Crash at that time EIP is NULL(0x00000000).So i could nt able to find the reason of crash in timer_bh() function.

There is no more messages related to interrupt on the system console(syslog).
(No printk releated to interrupt-handler information).

<6>ShutOK set!
<4>Press any key to reboot
<1>Unable to handle kernel NULL pointer dereference at virtual address 00000000
<4> printing eip:
<1>*pde = 00000000
<4>Oops: 0000

Could you please let me know why the kernel panic is happening?Is it possible to identify the reason for Crash.

Thankx is Advance.

Best Regards,


function, panic

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