Date: Tue, 11 Apr 2023 18:59:08 +0700 From: Eugene Grosbein <eugen@grosbein.net> To: Lee MATTHEWS <Lee.MATTHEWS.external@stormshield.eu>, "freebsd-hackers@FreeBSD.org" <freebsd-hackers@FreeBSD.org> Subject: Re: BINIT and BERR signals in MCA Message-ID: <24a51bf0-71de-f596-ef8b-785da4a27fd7@grosbein.net> In-Reply-To: <4bd3e1017a104598ab92e658f25b5367@stormshield.eu> References: <4bd3e1017a104598ab92e658f25b5367@stormshield.eu>
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11.04.2023 18:45, Lee MATTHEWS wrote: > Hello, > > One of our clients is experiencing problems using one of our products. It runs FreeBSD 11.3 on an Intel Atom Apollo Lake E3930 two core SoC processor. > > Occasionally, under very light load, the kernel will panic. I've managed to get a couple of vmcores and I notice via the backtrace that the MCA interrupt is called. > > I've managed to recover two vmcores and I notice in both of them that the Inter-Processor Interrupts are not being transferred from one CPU to the other. I've also noticed that the structure mca_internal contains information concerning the state of the MCA status register (value : 0x9000000020000003) for bank 0. > >>>From Intel's software architecture document, the MCA Error Code is 0x0003 "The BINIT# from another processor caused this processor to enter machine check." and the Model Specific Error Code is 0x2000 "1 if BERR is driven." > > The Intel document is not clear; could anyone please explain what the BINIT and BERR signals mean? They appear to be related to a bus, but I'm not sure which one. A bus external to the Atom SoC or one of the internal buses within the Atom SoC? > > Do you have any ideas of what could generate this type of error? Is it likely a hardware or a software issue? > > Thanks in advance. > > Best wishes, > Lee Matthews I believe this is some hardware issue, probably over-heating. Did you check for thermal sensor values?
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