Re: MCA UNCOR error
On Tuesday, February 14, 2012 7:57:50 am TAKAHASHI Yoshihiro wrote:
> In article <201202131308.48171.jhb@freebsd.org>
> John Baldwin <jhb@freebsd.org> writes:
>
> > On Sunday, February 12, 2012 4:55:49 am TAKAHASHI Yoshihiro wrote:
> >> I get the following error and kernel panic on my pc98 at the boot time.
> >>
> >> MCA: Bank 2, Status 0xb600000000140000
> >> MCA: Global Cap 0x0000000000000005, Status 0x0000000000000004
> >> MCA: Vendor "GenuineIntel", ID 0x616, APIC ID 0
> >> MCA: CPU 0 UNCOR PCC no error
> >> MCA: Address 0x3446ff003446ff
> >>
> >> When I disable MCA with hw.mca.enabled=0 on loader prompt, the machine
> >> works fine. Does it mean my pc98 is broken? Or other isssue?
> >>
> >> It's spec is:
> >>
> >> FreeBSD 10.0-CURRENT #5: Thu Feb 9 13:18:22 UTC 2012
> >> CPU: Pentium Pro (198.95-MHz 686-class CPU)
> >> Origin = "GenuineIntel" Id = 0x616 Family = 6 Model = 1 Stepping = 6
> >> Features=0xf9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV>
> >> real memory = 134217728 (128 MB)
> >> avail memory = 120471552 (114 MB)
> >
> > Interesting, that is odd to get an error with no error code.
> >
> > Can you tell from the stack trace if your CPU actually raised a machine check
> > exception (trap 28)?
>
> I tested with debugger enabled kernel.
> Please get from:
> http://home.jp.freebsd.org/~nyan/mca-error1.jpg
> (Sorry for jpeg images)
Humm. Try this:
Index: x86/x86/mca.c
===================================================================
--- mca.c (revision 231678)
+++ mca.c (working copy)
@@ -548,7 +548,12 @@ mca_scan(enum scan_mode mode)
valid = mca_check_status(i, &rec);
if (valid) {
count++;
- if (rec.mr_status & ucmask) {
+ /*
+ * Don't treat records that do not specify an
+ * error as unrecoverable.
+ */
+ if ((rec.mr_status & MC_STATUS_MCA_ERROR) != 0 &&
+ rec.mr_status & ucmask) {
recoverable = 0;
mca_log(&rec);
}
--
John Baldwin
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