Thanks, Patrick!
It is not the current version. It is

FreeBSD localhost.localdomain 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Fri
Jun 15 11:02:24 PDT 2007  

Thanks,
Yong

-----Original Message-----
From: Gelsema, P (Patrick) - FreeBSD [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, July 03, 2007 1:23 AM
To: Yong Rao
Cc: [EMAIL PROTECTED]
Subject: Re: SMP options and core dump failure

On Tue, July 3, 2007 02:59, Yong Rao wrote:
> Hello,
>
>
>
> We have a problem with SMP kernel. It could not dump out core when the
> crash happens.

Which version of FreeBSD? -Current?

better ask in [EMAIL PROTECTED] or file a PR.
http://www.freebsd.org/send-pr.html

Rgds,

Patrick


>
>
>
> I am able to isolate the problem to kernel configurations which have
SMP
> enabled when used with 2 cpus.
>
> With ONE cpu the core dump works ok.
>
>
>
> I built the kernel with GENERIC, and deliberately crash the kernel
(for
> testing purpose). The core dump works fine.
>
> Only added the "options SMP" and crashed the kernel, then prior to any
> pages being dumped out, it hangs there.
>
>
>
> Has someone successfully core dumped on a system using SMP kernel with
> multiple CPUs?
>
>
>
> I tried on two different boxes (different motherboards, CPUs and hard
> disks). Both got failed.
>
>
>
> I tried to enable the DDB, but don't know what to look for when it
goes
> into ddb. Appreciate any pointers.
>
>
>
> a) The CPU information is
>
>
>
> CPU: Dual Core AMD Opteron(tm) Processor 280 (2405.47-MHz 686-class
CPU)
>
>   Origin = "AuthenticAMD"  Id = 0x20f12  Stepping = 2
>
>
>
Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE
> ,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,S
>
> SE,SSE2,HTT>
>
>   Features2=0x1<SSE3>
>
>   AMD Features=0xe2500800<SYSCALL,NX,MMX+,FFXSR,LM,3DNow+,3DNow>
>
>   AMD Features2=0x3<LAHF,CMP>
>
>   Cores per package: 2
>
>
>
>
>
> b) We also tried on another mother board, which has 2 CPUs. The CPU
> information is below.
>
>
>
> CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2800.11-MHz 686-class CPU)
>
>   Origin = "GenuineIntel"  Id = 0xf29  Stepping = 9
>
>
>
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE
> ,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>
>   Features2=0x4400<CNTX-ID,<b14>>
>
> real memory  = 2147418112 (2047 MB)
>
> avail memory = 2096300032 (1999 MB)
>
> ACPI APIC Table: <A M I  OEMAPIC >
>
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs  cpu0 (BSP): APIC
> ID:  0
>
>  cpu1 (AP): APIC ID:  6
>
>
>
>
>
> c) The following are the prints when the dump hung.
>
>
>
> mem dump: start address = 0x4352, len=0x30
>
>
>
>
>
>
>
>
> Fatal trap 12: page fault while in kernel mode
>
>
> cpuid = 1; apic id = 01
>
>
> fault virtual address   = 0x4352
>
>
> fault code              = supervisor read, page not present
>
>
> instruction pointer     = 0x20:0xc9e9fc92
>
>
> stack pointer           = 0x28:0xebdbdbdc
>
>
> frame pointer           = 0x28:0xebdbdbf8
>
>
> code segment            = base 0x0, limit 0xfffff, type 0x1b
>
>
>                         = DPL 0, pres 1, def32 1, gran 1
>
>
> processor eflags        = interrupt enabled, resume, IOPL = 0
>
>
> current process         = 74231 (pnicdbg)
>
>
> trap number             = 12
>
>
> panic: page fault
>
>
> cpuid = 1
>
>
> Uptime: 1d18h27m42s
>
>
> Dumping 4030 MB (2 chunks)
>
>
>   chunk 0: 1MB (154 pages) ... ok
>
>
>   chunk 1: 4031MB (1031776 pages)   (stopped and hung here)
>
>
>
>
>
> Thanks,
>
>
>
> Yong Rao
>
> Force10 Networks Inc.
>
> 350 Holger Way
>
> San Jose, CA 95132
>
> 408 571 6317
>
>
>
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