With my 2.4.20-pre4-ac1 kernel, the lock_kernel is at offset +3a,
according to your dump it's at +6a.
>> switch (cmd) {
>
> This CPU is spinning, waiting for kernel_flag. It will take the IPI
> and the other CPU's smp_call_function() will succeed.
>
> Possibly the IPI has got lost - seems that this is a popular failure mode
> for flakey chipsets/motherboards.
>
> Or someone has called sys_ioctl() with interrupts disabled. That's very
> doubtful.
Is it possible to display the cpu registers with kdb? Could you check
that the interrupts are enabled?
I'd add a quick test into sys_ioctl() or lock_kernel: save_flags, and
check that bit 9 is always enabled. Check __global_cli for sample code.
The X server probably runs with enough priveledges to disable the
interrupts, perhaps it's doing something stupid.
-- Manfred
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