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manywele
l33t
Joined: 12 Jul 2003
Posts: 743
Location: Inside
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 Posted: Wed Dec 06, 2006 1:07 am Post subject: Why don't I have a /dev/mcelog? |
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I have mce enabled in the kernel:
| Code: | $ less /proc/config.gz | grep -i mce
CONFIG_X86_MCE=y
CONFIG_X86_MCE_NONFATAL=y
# CONFIG_X86_MCE_P4THERMAL is not set
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and I'm using udev.
I'm getting MCE errors that I'd like to look up but, no /dev/mcelog:
| Code: | bob@bob ~ $ ll /dev | grep -i mce
bob@bob ~ $
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/proc/cpuinfo says:
| Code: | $ cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 10
model name : AMD Athlon(tm) XP 2800+
stepping : 0
cpu MHz : 2082.866
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow up ts
bogomips : 4170.53
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What am I missing?
Last edited by manywele on Sat Dec 09, 2006 6:13 pm; edited 2 times in total |
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didymos
Advocate
Joined: 10 Oct 2005
Posts: 4798
Location: California
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| Posted: Wed Dec 06, 2006 3:07 am Post subject: |
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| Code: | | emerge app-admin/mcelog |
_________________
Thomas S. Howard |
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manywele
l33t
Joined: 12 Jul 2003
Posts: 743
Location: Inside
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| Posted: Wed Dec 06, 2006 3:16 am Post subject: |
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| Forgot to add that I already did that (it's how I figured out I needed it). |
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manywele
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Joined: 12 Jul 2003
Posts: 743
Location: Inside
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| Posted: Fri Dec 08, 2006 12:11 am Post subject: |
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*bump*
I really don't know where to start looking. Anyone...? |
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OldTango
l33t
Joined: 21 Feb 2004
Posts: 718
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| Posted: Fri Dec 08, 2006 8:20 pm Post subject: |
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| manywele wrote: | *bump*
I really don't know where to start looking. Anyone...? |
try
also
I beleive the logs will be stored at /var/log/mcelog |
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manywele
l33t
Joined: 12 Jul 2003
Posts: 743
Location: Inside
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| Posted: Sat Dec 09, 2006 1:38 am Post subject: |
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I have read the man page. I have googled. The problem that I can't resolve is that I don't have a /dev/mcelog. To be perfectly clear about it:
| Code: | # mcelog --generic
Cannot open /dev/mcelog |
because /dev/mcelog doesn't exist. I don't know why it doesn't exist. I can't find anything about people doing something special to get one. As I stated above, I have mce enabled in the kernel. In fact googling for "cannot open /dev/mcelog" returns exactly two results, one of which is in French and the other is to a Suse mailing list with one response which suggests
| Code: | | mknod -m 0600 /dev/mcelog c 10 227 |
which is what the man page says it should be. Doing that gives me a /dev/mcelog but I still get a "Cannot open /dev/mcelog" error. |
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didymos
Advocate
Joined: 10 Oct 2005
Posts: 4798
Location: California
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| Posted: Sat Dec 09, 2006 2:45 pm Post subject: |
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On my machine /dev/mcelog has 660 permissions. I don't see how that makes much difference though. I'm also sending mcelog output to the syslog facility, instead of /var/log/mcelog.
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OldTango
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Joined: 21 Feb 2004
Posts: 718
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| Posted: Sat Dec 09, 2006 3:16 pm Post subject: |
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| If I try to open mcelog as a normal user I get the same error message as you. You need to do it as root. Also is your system logger mine =syslog_ng running. If so, it should send the logs to /var/log/mcelog/. I just assumed this was the default for the gentoo install. The steps I followed to set it up where the same ones you used. However the /dev/mcelog was created for me by udev, also with 660 permissions. |
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manywele
l33t
Joined: 12 Jul 2003
Posts: 743
Location: Inside
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| Posted: Sat Dec 09, 2006 4:06 pm Post subject: |
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I am running as root (see the prompt above). My system logger is working just fine. Udev is not creating /dev/mcelog however. Even curiouser, it's happened on two of my boxen.
Athlon XP 2800+ running testing branch, 2.6.17-gentoo-r7, udev 103, not storing as tarball, no /dev/mcelog. Tried going all the way back down to udev-087-r1, restarting udev and rebooting. Still no /dev/mcelog.
Pentium III running stable branch, 2.6.16-gentoo-r9, mce enabled in the kernel, no /dev/mcelog.
Both boxen are synced and up to date including configs. The kernel is reporting non-fatal, correctable MCE events in /var/log/kernel and dmesg. Two different computers, one testing x86, one stable x86, different kernels, different udevs, same problem. Creating /dev/mcelog with mknod (0600 or 0660) gives me a character device that I still can not open, even as root with mcelog.
What have I missed? |
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dsd
Developer
Joined: 30 Mar 2003
Posts: 2162
Location: nr London
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| Posted: Sat Dec 09, 2006 4:17 pm Post subject: |
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run:
uname -v
ls -l /usr/src/linux/arch/i386/boot/bzImage
and show us the output
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manywele
l33t
Joined: 12 Jul 2003
Posts: 743
Location: Inside
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| Posted: Sat Dec 09, 2006 4:48 pm Post subject: |
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| Code: | bob@bob ~ $ uname -v
#2 Sat Sep 16 09:36:16 PDT 2006
bob@bob ~ $ ls -l /usr/src/linux/arch/i386/boot/bzImage
-rw-r--r-- 1 root root 2441416 Sep 16 09:36 /usr/src/linux/arch/i386/boot/bzImage
bob@bob ~ $
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dsd
Developer
Joined: 30 Mar 2003
Posts: 2162
Location: nr London
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| Posted: Sat Dec 09, 2006 6:01 pm Post subject: |
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im not sure why, but the driver which creates /dev/mcelog is only built on x86_64
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manywele
l33t
Joined: 12 Jul 2003
Posts: 743
Location: Inside
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| Posted: Sat Dec 09, 2006 6:13 pm Post subject: |
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Hmm. Must have changed relatively recently. My friend with a gentoo box which is sorely out of date maintanence-wise has a /dev/mcelog on x86.
Thanks for clearing that up. |
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OldTango
l33t
Joined: 21 Feb 2004
Posts: 718
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| Posted: Sun Dec 10, 2006 12:03 am Post subject: |
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| dsd wrote: | | im not sure why, but the driver which creates /dev/mcelog is only built on x86_64 |
Yes Thanks I learned something new. Maybe this helps explain why..........................  MCElog
I am curious if there is something similar for x86, or if mcelog can be made to work with x86. |
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