>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 [email protected]:/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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