> I have a heavily loaded server, and it crashes every now and then,
> about once a day. I usually get no messages, but today I got this
> one in my syslog:
> -----<syslog>-----
> Apr 26 12:10:53 scorpio kernel: kmem_free: Bad obj addr (objp=c4bcb860,
> name=buffer_head)
> Apr 26 12:10:53 scorpio kernel: Unable to handle kernel NULL pointer
> dereference at virtual address 00000000
> Apr 26 12:10:53 scorpio kernel: current->tss.cr3 = 00101000, %cr3 =
> 00101000
> Apr 26 12:10:53 scorpio kernel: *pde = 00000000
> -----</syslog>-----
Looks very much like memory problems. Try disabling external cache in
case that's where the problem is. Overclocked CPUs can also lead to
this.
--Stephen
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