* Yoshihiro Takahashi <[email protected]> wrote:
> Hi.
>
> kdump hangs up by Sysrq+C trigger once in about 10 times in high load.
> After the above occurs, kdump cannot collect vmcores with NMI button.
> When waiting_for_crash_ipi does case more than 0, mdelay seem to make a
> stall.
>
> While nmi_shootdown_cpus(), mdelay may not work since interruption is
> disable. (ex. when crashing kernel by NMI interruption, all
> interruption may be disabled.).
>
> So I think that it should use other way (TSC) instead of mdelay() in
> nmi_shootdown_cpus().
mdelay uses either the tsc or CPU loops - neither stop while IRQs are
disabled.
Could you figure out exactly why it hangs in your case?
Ingo
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