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 rx0, 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. Fix: Setting hw.mca.enabled=0 works around the problem. How-To-Repeat: Boot a generic kernel on a Tyan Tiger MP (S2460).
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Keyword: crash – in lieu of summary line prefix: [panic] * bulk change for the keyword * summary lines may be edited manually (not in bulk). Keyword descriptions and search interface: <https://bugs.freebsd.org/bugzilla/describekeywords.cgi>
^Triage: I'm sorry that this PR did not get addressed in a timely fashion. By now, the version that it was created against is long out of support. Please re-open if it is still a problem on a supported version.