Re: athlon-mp daily hang 5.2.1

Patrick Crosby wrote:
> Just about every day, my FreeBSD system hangs.  I set up
> dumpdev/dumpdir, but I never get anything in /var/crashes.  I'm not
> sure what to do to debug the problem.  It usually happens during a
> 'gmake -j4...', but has happened at other times as well.  Someone on
> freebsd-questions suggested that the CPU(s) might be overheating.
> Today I monitored the temperature all day long and it just crashed
> during a compile with no change in temperature.
> 
> What can I do to get more information about what is causing the hang?
> 
> I have the following in rc.conf to try to get a kernel crash dump:
> 
> dumpdev="/dev/ad0s1b"
> dumpdir="/var/crash"
> 
> And I'm running a kernel with debug symbols.  I'm running FreeBSD
> 5.2.1-RELEASE-p5 with 2 athlon mp processors, using the GENERIC kernel
> config file (except I commented out INET6 so that firefox will resolve
> domains in a timely fashion): 
> 
> ACPI APIC Table: <PTLTD          APIC  >
> Timecounter "i8254" frequency 1193182 Hz quality 0
> CPU: AMD Athlon(tm) MP 2600+ (2000.08-MHz 686-class CPU)
>   Origin = "AuthenticAMD"  Id = 0x6a0  Stepping = 0
>   Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
>   AMD Features=0xc0480000<MP,AMIE,DSP,3DNow!>
> real memory  = 1073217536 (1023 MB)
> avail memory = 1033003008 (985 MB)
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
>  cpu0 (BSP): APIC ID:  1
>  cpu1 (AP): APIC ID:  0
> ioapic0 <Version 1.1> irqs 0-23 on motherboard

If your system is hanging then you may not be getting a dump. 
Regardless, here's some general dump stuff:
Is your swap partition (/dev/ad0s1b) large enough to hold the dump (>= 
1024MB)?
Does /var have enough free space to hold the dump (>= 1024MB)?

The default /var size is only 256MB, so you may need to choose a 
different dumpdir.

Jon Noack