Messages in this thread | | | Date | Tue, 16 Dec 2008 12:09:49 +0100 | From | Ingo Molnar <> | Subject | Re: kdump hangs up by Sysrq+C trigger in high load. |
| |
* Yoshihiro Takahashi <ytakahashi@miraclelinux.com> 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
| |