Hey all- I've been getting reports of some x86_64 systems that, on kdump kernel boot get stuck in calibrate_delay(), in both RHEL kernels and upstream kernels. The current thinking is that the lapic timer interrupt is no longer getting delivered, likely because we handle a crash condition on a cpu that isn't the boot cpu. One known offender is this motherboard: http://www.supermicro.com/Aplus/motherboard/Opteron8000/MCP55/H8QM8-2.cfm My current thought is that the TIMER_LVT entry is masked on all but the boot cpu on this system (which is strange, as I was under the impression that the timer interrupt was supposed to be enabled on all CPU's nominally. At any rate, I was going to try to read/write the TIMER_LVT on the crashing processor before we jump to purgatory, or in purgatory itself, to see if that fixes the problem, but I wanted to report the issue here to see if anyone had any alternate thoughts. I know that intel ioapics had a timer related problem recently that caused the same issue, but the fix doesn't seem to help in this case. Thanks & Regards Neil -- /*************************************************** *Neil Horman *Software Engineer *Red Hat, Inc. *nhorman at redhat.com *gpg keyid: 1024D / 0x92A74FA1 *http://pgp.mit.edu ***************************************************/
