Date: Mon, 15 Dec 2014 17:49:54 +0000 From: "Rang, Anton" <anton.rang@isilon.com> To: Ivan Klymenko <fidaj@ukr.net>, Andriy Gapon <avg@FreeBSD.org> Cc: "freebsd-current@FreeBSD.org" <freebsd-current@FreeBSD.org> Subject: RE: 11-CURRENT r275641 panic: Unrecoverable machine check exception Message-ID: <F21EDC44C64DB34B90AF485AC3CEDD4B354B0A89@MX104CL01.corp.emc.com> In-Reply-To: <20141213113823.660a1e05@nonamehost.local> References: <20141212214653.41cec479@nonamehost.local> <548B85E7.7000102@FreeBSD.org> <20141213113823.660a1e05@nonamehost.local>
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> I certainly could be wrong - but how to know for sure the cause of the panic? > MCA: CPU 0 UNCOR PCC OVER DCACHE L2 DRD error > MCA: Address 0xbd8d4cc0 > MCA: Misc 0x30e3000086 The "root cause" may be hard to determine, but the immediate cause was helpfully decoded by the kernel. (Though I don't know whether all of the model-specific fields were decoded.) UNCOR = uncorrected error PCC = processor context corrupted (can't safely continue to execute, thus the panic) OVER = error overflow (hmmm, multiple errors occurred) DCACHE L2 DRD = data being read from L2 data cache The miscellaneous register indicates that 0xbd8d4cc0 is a physical address. So this looks like a processor failure. If it is repeatable, though, it may indicate either failed hardware or some problem in configuring the processor (though I'm not sure how that could lead to a cache error). Antonhelp
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