FreeBSD 6 Hard Lock no logs

[Lowell Gilbert]

"Rob Connon (Info)" <rob.info at vfs.com> writes:

> Hi,
>
> I have a web/mail server thats running the lastest version of FreeBSD
> 6.0-RELEASE-p9 #4. In the last month or so it's started hard locking..
> when the machine locks up i can still ping it and get connects from
> telneting to 80,22,etc sometimes i get a banner and sometimes i
> dont.. but there are
> no errors on the console or in the logs.
>
> The odd thing is the locking seems to happen within a certain time
> window (mon,tues) and never end of the week or weekend.. i suspected
> it could have been
> a bad cron job but nothing falls into that time frame.
>
> As a test i've been rebooting the server everynight to see if that
> would help the machine get past the begining of the week with out a
> hang and again this morning
> even though i rebooted last night at 10pm hung around 9:47am.
>
> The machine is a Dell PowerEdge 2550, I've had dell come and replace
> the MB and have ran all their diagnostics aswell with no errors
> reported..
> I've been reading alot about APIC and ACPI and people having similar
> issues but nothing that fits the bill... below is the dmesg and output
> of vmstat -i.. another odd thing is the rate for the CPU timer is
> extremely high compared to other machines with similar hardware or
> faster hardware.
>
> Any help on where to look next would be awesome.

Try a debugging kernel and see if you can break to the debugger after
the freeze.  If so, youcan look at task states.