Hi,

We've switched to FreeBSD recently to accomodate large video storage as we
are running video streaming website. So the job of the FreeBSD is to
transcode the uploaded videos using ffmpeg and serve them to users via nginx
webserver but so far our experience is not very good with it. It crashes
every 2-3 days and we're unable to track down the problem. The server specs
are pretty high :


Supermicro X5690 (12 cores, 24 threads - 2u)
96GB RAM
12x3TB RAID-10 (HBA-LSI9211)

Here is the screenshot of recent crash :

http://prntscr.com/9er3pk

One thing worth mentioning is, before going down there's no load on server,
more or less free RAM usually is around 12GB.  We've tried following
solutions so far :


- Updated FreeBSD OS
- Replaced 800W PS with 900W
- We've reduced CMOS from MAX(26x) to 18x as suggested in this post
http://unix.stackexchange.com/questions/60574/determining-cause-of-linux-kernel-panic

The solution we've not performed so far is :

- Disable mca using (hw.mca.enabled: 0) - As we're getting MCA panics.

Here is the crash dump :

[root@cw001 /var/crash]# mcelog --no-dmi --ascii --file core.txt.1 
HARDWARE ERROR. This is *NOT* a software problem!
Please contact your hardware vendor
CPU 3 BANK 5 
MISC 0 ADDR 802bf6a69 
MCG status:MCIP 
MCi status:
Uncorrected error
Error enabled
MCi_MISC register valid
MCi_ADDR register valid
Processor context corrupt
MCA: Internal Timer error
STATUS be00000000800400 MCGSTATUS 4
MCGCAP 1c09 APICID 3 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 44
HARDWARE ERROR. This is *NOT* a software problem!
Please contact your hardware vendor
CPU 2 BANK 5 
MISC 0 ADDR 802bf6a69 
MCG status:MCIP 
MCi status:
Uncorrected error
Error enabled
MCi_MISC register valid
MCi_ADDR register valid
Processor context corrupt
MCA: Internal Timer error
STATUS be00000000800400 MCGSTATUS 4
MCGCAP 1c09 APICID 2 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 44
HARDWARE ERROR. This is *NOT* a software problem!
Please contact your hardware vendor
CPU 3 BANK 5 
MISC 0 ADDR 802bf6a69 
MCG status:MCIP 
MCi status:
Uncorrected error
Error enabled
MCi_MISC register valid
MCi_ADDR register valid
Processor context corrupt
MCA: Internal Timer error
STATUS be00000000800400 MCGSTATUS 4
MCGCAP 1c09 APICID 3 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 44
HARDWARE ERROR. This is *NOT* a software problem!
Please contact your hardware vendor
CPU 2 BANK 5 
MISC 0 ADDR 802bf6a69 
MCG status:MCIP 
MCi status:
Uncorrected error
Error enabled
MCi_MISC register valid
MCi_ADDR register valid
Processor context corrupt
MCA: Internal Timer error
STATUS be00000000800400 MCGSTATUS 4
MCGCAP 1c09 APICID 2 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 44

-----------------------------------------------------------------------------------

I showed those Hardware errors to Vendor from whom we purchased Supermicro
servers . This is what he has to say :

-----------------------------------
Why do you not made one test environment with CentOS or one other Linux that
you know to use, and see if you have same errors ??? if not than you know
that the errors come from OS not from hardware. ( CentOS, RedHead….work
diferend like FreeBSD – work direct on hardware if you don’t have the right
kernel settings can the server crashed. CentOS , RedHead…. don’t work direct
on hardware and distribute the resource load better and you have better
control and you can better debug one situation)
-----------------------------------

Now we're on a black hole and unable to find that either issue with FreeBSD
or Hardware. We're thinking to disable mca in loader.conf but ppl are not
suggesting it. If you guys can help us, it'd be very kind.



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