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SubjectRe: endless loop in native_flush_tlb_others in smp_64.c
On Tue, 11 Mar 2008, Jike Song wrote:
> > Most of them happend in X.org so at first I thought it had something to do
> > with the NVIDIA module... BUT, one time it froze "a way before" the module
> > could get loaded (and desynced my raid.......).
> >
> > ---
> > SYSRQ-P revealed that the CPU were looping inside:
> >
> > smp_64.c native_flush_tlb_others:
> > assembler code:
> > < 1ee: f3 90 pause
> > < 1f0: f6 45 00 03 testb $0x3,0x0(%rbp)
> > < 1f4: 75 f8 jne 1ee <native_flush_tlb_others+0x5f>
> >
> > also known as: (in C)
> >
> > while (!cpus_empty(f->flush_cpumask))
> > cpu_relax();
> >
> > So... has anyone a good idea what's happening here exactly? Or is there
> > already another topic or even a patch available?

Any chance that you can capture SYSRQ-T output via serial or
netconsole, so we can see the stacktrace and what the other CPUs are
doing, if they are doing anything.

Thanks,
tglx


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