Re: 2.6.14 X spinning in the kernel

[Andrew Morton]

Badari Pulavarty <pbadari@xxxxxxxxxx> wrote:
>
> My 2-cpu EM64T machine started showing this problem again on 2.6.14.
> On some reboots, X seems to spin in the kernel forever.
> 
> sysrq-t output shows nothing.
> 
> X             R  running task       0  3607   3589          3903
> (L-TLB)
> 
> top shows:
>  3607 root      25   0     0    0    0 R 99.1  0.0 262:04.69 X
> 
> 
> So, I wrote a module to do smp_call_function() on all CPUs
> to show stacks on them. CPU0 seems to be spinning in exit_mmap().
> I did this multiple times to collect stacks few times.
> 
> Is this a known issue ?

Nope.  Maybe your vma list has a loop in it, in remove_vma()?  slab
debugging would detect that, due to the repeated
kmem_cache_free(vm_area_cachep, vma);

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