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Date: Sat, 4 Dec 2004 16:11:25 -0800 (PST)
From: Doug White <dwhite@gumbysoft.com>
To: Wei-Kai Wu <wkwu@csie.nctu.edu.tw>
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cc: freebsd-stable@FreeBSD.org
cc: freebsd-bugs@FreeBSD.org
cc: rwatson@FreeBSD.org
Subject: Re: amd64/71644: amd64 5.3-BETA4 crash when heavy load
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On Thu, 2 Dec 2004, Wei-Kai Wu wrote:

> On Sun, Nov 28, 2004 at 11:16:39PM +0800, Xin LI wrote:
> > Hmm...   Is it possible to obtain a backtrace (bt full under kgdb) and post
> > it?
> > Additionally I suggest that you post the same thing to -stable@ and cc to
> > rwatson@, along with your dmesg.boot (verberose perferred).
>
> Here is the panic messages: (If this is not what you want,
> could you tell me what I shall do? thanks!)

Try turning off SACK:

sysctl net.inet.tcp.sack.enable=0

>
> Fatal trap 12: page fault while in kernel mode
> cpuid = 3; apic id = 03
> fault virtual address = 0x18
> fault code            = supervisor read, page not present
> instruction pointer   = 0x8:0xffffffff8026ece0
> stack pointer         = 0x10:0xffffffffd2d6f8b0
> frame pointer         = 0x10:0xffffffffd2d6f920
> code segment          = base 0x0, limit 0xfffff, type 0x1b
>                       = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags      = resume, IOPL = 0
> current process       = 46 (swi1: net)
> [thread 100025]
> Stopped at m_copym+0x40:    incl %ebp
>
> db> trace
> m_copym() at m_copym+0x40
> tcp_output() at tcp_output+0xdf1
> tcp_input() at tcp_input+0x1d2b
> netisr_processqueue() at netisr_processqueue+0xd2
> swi_net() at swi_net+0x13c
> ithread_loop() at ithread_loop+0x1b8
> fork_exit() at fork_exit+0xaa
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip = 0, rsp = 0xffffffffffd2d6fd00, rbp = 0 ---
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-- 
Doug White                    |  FreeBSD: The Power to Serve
dwhite@gumbysoft.com          |  www.FreeBSD.org