Messages in this thread | | | Date | Sun, 9 Aug 2009 12:03:48 +0200 | From | Johannes Stezenbach <> | Subject | Re: 2.6.31-rc5 regression: x86 MCE malfunction on Thinkpad T42p |
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On Fri, Aug 07, 2009 at 07:09:42PM +0200, Johannes Stezenbach wrote: > > I'm currently running linux-2.6.31-rc5-246-g90bc1a6 on > an old Thinkpad T42p. During boot I get the following: ... > I guess I should try to boot with "lapic"? But I think > MCE worked without "lapic" in earlier kernels. On a 2.6.29.1 > kernel dmesg said: > > Local APIC disabled by BIOS -- you can enable it with "lapic" > ... > Intel machine check architecture supported. > Intel machine check reporting enabled on CPU#0. > > 2.6.29.1 doesn't log any MCE events, so I doubt this is a HW problem.
I booted with "lapic", then the backtrace is gone but it still logs machine check events which I think are bogus since 2.6.29.1 does not log any. I also tried 2.6.30, no machine check messages in dmesg. But I noticed that mcelog complains about missing /dev/mcelog, it seems that /dev/mcelog support for 32bit kernels is new. However, I guess the old kernels should still have printed a messge to dmesg, right? "Uncorrected error" + "Processor context corrupt" sounds pretty serious, but the machine runs without problems.
These are from 2.6.31-rc5 by running mcelog (dmesg just says "Machine check events logged"):
HARDWARE ERROR. This is *NOT* a software problem! Please contact your hardware vendor MCE 0 CPU 0 BANK 1 TIME 1249725930 Sat Aug 8 12:05:30 2009 MCG status: MCi status: Error overflow Uncorrected error Error enabled Processor context corrupt MCA: MEMORY CONTROLLER AC_CHANNEL0_ERR Transaction: Address/Command error STATUS f2000000000000b0 MCGSTATUS 0 MCGCAP 5 APICID 0 SOCKETID 0 CPUID Vendor Intel Family 6 Model 13 HARDWARE ERROR. This is *NOT* a software problem! Please contact your hardware vendor MCE 1 CPU 0 BANK 1 TIME 1249728066 Sat Aug 8 12:41:06 2009 MCG status: MCi status: Error overflow Uncorrected error Error enabled Processor context corrupt MCA: Unknown Error 20 STATUS f200000000000020 MCGSTATUS 0 MCGCAP 5 APICID 0 SOCKETID 0 CPUID Vendor Intel Family 6 Model 13 HARDWARE ERROR. This is *NOT* a software problem! Please contact your hardware vendor MCE 2 CPU 0 BANK 1 TIME 1249747923 Sat Aug 8 18:12:03 2009 MCG status: MCi status: Error overflow Uncorrected error Error enabled Processor context corrupt MCA: Unknown Error 30 STATUS f200000000000030 MCGSTATUS 0 MCGCAP 5 APICID 0 SOCKETID 0 CPUID Vendor Intel Family 6 Model 13 HARDWARE ERROR. This is *NOT* a software problem! Please contact your hardware vendor MCE 3 CPU 0 BANK 1 TIME 1249765938 Sat Aug 8 23:12:18 2009 MCG status: MCi status: Error overflow Uncorrected error Error enabled Processor context corrupt MCA: Unknown Error 20 STATUS f200000000000020 MCGSTATUS 0 MCGCAP 5 APICID 0 SOCKETID 0 CPUID Vendor Intel Family 6 Model 13
Johannes
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