Date: Fri, 14 May 2010 18:39:03 +0200 (CEST) From: "Walter C. Pelissero" <walter.pelissero@iesy.net> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/146590: MCA panics 7.3 Message-ID: <201005141639.o4EGd38a004915@zaphod.home.lan> Resent-Message-ID: <201005141650.o4EGo5qF084298@freefall.freebsd.org>
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>Number: 146590 >Category: kern >Synopsis: MCA panics 7.3 >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri May 14 16:50:05 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Walter C. Pelissero >Release: FreeBSD 7.3-STABLE i386 >Organization: >Environment: System: FreeBSD zaphod.home.lan 7.3-STABLE FreeBSD 7.3-STABLE #0: Fri May 14 13:43:05 CEST 2010 root@zaphod.home.lan:/usr/src/sys/i386/compile/TIGER-MP i386 >Description: FreeBSD 7.3-STABLE on a Tyan Tiger MP (S2460) panics almost upon loading the kernel. The screen reads something like: real memory = [...] avail memory = [...] ACPI APIC Table: <PTLTD APIC> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs cpu0 (BSP): APIC ID: 1 cpu1 (AP): APIC ID: 0 MCA: Bank 0, Status 0xf662a00000000833 MCA: Global Cap 0x0000000000000104, Status 0x0000000000000004 MCA: Vendor "AuthenticAMD", ID 0x681, APIC ID 1 MCA: CPU 0 UNCOR PCC OVER BUSLG Source DRD Memory MCA: Address 0xe4000 Fatal trap 28: machine check trap while in kernel mode cpuid = 0; apic id = 01 instruction pointer = 0x20:0xc06ebc03 stack pointer = 0x28:0xc0c20d1c frame pointer = 0x28:0xc0c20d44 doce segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, def32 1, gran 1 processor eflags = interrupt enabled, IOPL = 0 current process = 0 [thread pid 0 tid 0 ] Stopped at bios_sigsearch+0x93: leal 0(%ebx,%eax,1),xedx db> This machine had no problem at least until short before 7.3-RELEASE, so I'd rule out an actual hardware error. >How-To-Repeat: Boot a generic kernel on a Tyan Tiger MP (S2460). >Fix: Setting hw.mca.enabled=0 works around the problem. >Release-Note: >Audit-Trail: >Unformatted:
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