Len Hello
My program offline a processor and uses it as some sort of an engine (
aka offline scheduler, if you recall).
It seems that it is possible to hung the kernel when a huge core dump
(40G) is been dumped while brining
a processor online at the same time.
I debugged the cpu_up code a bit and it seems that it hangs possibly
around the bellow code.
wakeup_secondary_via_INIT()
....
for (j = 1; j <= num_starts; j++) {
Dprintk("Sending STARTUP #%d.\n",j);
apic_write(APIC_ESR, 0);
apic_read(APIC_ESR);
Dprintk("After apic_write.\n");
....
I am using redhat kernels. 2.6.18-164 ( redhat 5.4 ) or 2.6.18-8.el5 (
reddhat 5.0 ).
happens in both kernels.
Is this a known issue ? Is there a patch somewhere ? if so, what is
the problem ?
thank you
raz
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