Re: kernel panic

On Thu, 11 Oct 2007, hong zhang wrote:

> List,
> 
> I got kernel panic when I format USB scsi hard disk.
> When I run "mkfs.ext3 -j /dev/sda1" on kernel 2.6.19.2
> but it is no problem on kernel 2.6.10. This also
> occurs sometimes  when boot up. Therefore, I believe
> it is not related to mkfs.ext3 operation. PC conects
> to imx31 based board by means of ethernet/usb cable.
> And board mounts rootfs over nfs.
> 
> My board has two usb hosts, host1 connects PC and
> host2 conects to hard disk.
> 
> Any help will be appreciated!!!
> 
> See following Oops:
> 
> Starting the dropbear ssh server:
> Unable to handle kernel NULL pointer dereference at
> virtual address 00000000
> pgd = c3bb0000
> [00000000] *pgd=83922031, *pte=00000000,
> *ppte=00000000
> Internal error: Oops: 817 [#1]
> Modules linked in:
> CPU: 0
> PC is at start_unlink_async+0x40/0x14c
> LR is at ehci_work+0x13c/0x6b4

You will need to make a disassembly listing of start_unlink_async (use
objdump -d ehci-hcd.o).  Then read through the object code, comparing
it with the source code, to find out what C instruction corresponds to
offset 0x40.  Also figure out which register contains a NULL pointer
and what C variable it corresponds to.

Then when you know what's wrong in terms of the source code, tell us so 
we can try to fix it.

Alan Stern


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