spontaneous reboot - ptrace

[Kostik Belousov]

On Tue, Feb 15, 2011 at 09:46:05AM -0800, Dr. Baud wrote:
>     I've an interesting anomaly I'd appreciate some help with.
> 
> As a result of looking at a threading problem I modified gcore 
> to dump all memory segments associated with a process;
> basically comment out the "Ignore" conditional in readmap().
>     The result is that the box spontaneously reboots sometime
> Between 40 and 50 seconds into the dump; this is an application
> that is indeed a memory hog. I commented out the actual
> write to disk and the result is the same. I???ve even disabled the
> watchdog to no avail.
> 
>     This is a vanilla 8.1 install:
> 
> FreeBSD pollyanna 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:36:49 UTC 
> 2010
>      root at mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
> 
>     running on fairly vanilla hardware:
> 
> CPU: Intel(R) Xeon(TM) CPU 3.20GHz (3212.93-MHz K8-class CPU)
>   Origin = "GenuineIntel"  Id = 0xf49  Family = f  Model = 4  Stepping = 9
>   Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,C
> MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>   Features2=0x641d<SSE3,DTES64,MON,DS_CPL,CNXT-ID,CX16,xTPR>
>   AMD Features=0x20000800<SYSCALL,LM>
>   AMD Features2=0x1<LAHF>
>   TSC: P-state invariant
> 
>  
>     Any thoughts on how to proceed?

First, do you have a console output during the run ? Is it possible
that machine paniced ? If not, were there any kernel messages before
reboot ?

Second, what is the process you are dumping ? Can you show at least
the procstat -v <pid> output for the process ?
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