From owner-freebsd-current  Sun Mar 18  9:31:41 2001
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Date: Sun, 18 Mar 2001 19:29:17 +0200
From: Valentin Nechayev <netch@iv.nn.kiev.ua>
To: Dag-Erling Smorgrav <des@ofug.org>
Cc: current@FreeBSD.ORG
Subject: Re: Interesting backtrace...
Message-ID: <20010318192917.A18225@iv.nn.kiev.ua>
References: <xzpwv9nf5kg.fsf@flood.ping.uio.no>
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In-Reply-To: <xzpwv9nf5kg.fsf@flood.ping.uio.no>; from des@ofug.org on Sun, Mar 18, 2001 at 04:41:03PM +0100
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 Sun, Mar 18, 2001 at 16:41:03, des (Dag-Erling Smorgrav) wrote about "Interesting backtrace...": 

> I finally caught a backtrace from one of those recurring stack smash
> panics. I've been getting a few of these every day for a couple of
> weeks now but never caught a dump; I caught this one by typing 'panic'
> immediately instead of trying to get a trace at the ddb prompt first.

[...]

> #11 0xffff037f in ?? ()
> #12 0xc023c8bb in vm_fault (map=0xd0768a00, vaddr=138502144,
>     fault_type=2 '\002', fault_flags=8) at ../../vm/vm_page.h:493

I seen a bunch of identical panics on my home system (5.0-current
of ~2001.02.27.22.10.00 UTC).
I did not reported them yet because of lack of understanding
what's happen because pmap_zero_page() call is occured in vm_fault()
without this call in source code ;|

> Looks to me like there was a page fault, and the stack got corrupted
> while handling that fault (possibly somewhere in pmap_zero_page(),
> called from vm_page_zero_fill() which is inlined in vm_fault()).
> (BTW, this is a K6-2, which as far as I can tell is a 586-class CPU)

The same, K6-2:

CPU: AMD-K6(tm) 3D processor (298.96-MHz 586-class CPU)
  Origin = "AuthenticAMD"  Id = 0x58c  Stepping = 12
  Features=0x8021bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,PGE,MMX>
  AMD Features=0x80000800<SYSCALL,3DNow!>


/netch

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