Bug 146590 - [mca] [panic] MCA panics 7.3
Summary: [mca] [panic] MCA panics 7.3
Status: Open
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 7.3-STABLE
Hardware: Any Any
: Normal Affects Only Me
Assignee: freebsd-bugs (Nobody)
URL:
Keywords: crash
Depends on:
Blocks:
 
Reported: 2010-05-14 17:50 UTC by Walter C. Pelissero
Modified: 2022-10-17 12:17 UTC (History)
0 users

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Description Walter C. Pelissero 2010-05-14 17:50:05 UTC 
	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).
Comment 1 Eitan Adler freebsd_committer freebsd_triage 2017-12-31 07:59:32 UTC 
For bugs matching the following criteria:

Status: In Progress Changed: (is less than) 2014-06-01

Reset to default assignee and clear in-progress tags.

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Comment 2 Graham Perrin freebsd_committer freebsd_triage 2022-10-17 12:17:03 UTC 
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>