Date: Tue, 16 Feb 1999 10:33:48 +1030 From: Greg Lehey <grog@lemis.com> To: Luoqi Chen <luoqi@watermarkgroup.com>, current@FreeBSD.ORG, khetan@iafrica.com Subject: Re: Problems in VM structure ? Message-ID: <19990216103348.M2207@lemis.com> In-Reply-To: <199902152300.SAA15708@lor.watermarkgroup.com>; from Luoqi Chen on Mon, Feb 15, 1999 at 06:00:16PM -0500 References: <199902152300.SAA15708@lor.watermarkgroup.com>
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On Monday, 15 February 1999 at 18:00:16 -0500, Luoqi Chen wrote:
>> Hi.
>>
>> I saw that my 4-CURRENT box from 8 February dropped to ddb
>> after my last make world. I rebuilt world today, and the
>> same problem is occuring. These problems started occuring
>> after Matt Dillon's changes to the VM system.
>>
>> What is worrying/troubling is that in single user mode,
>> the machine is stable, and manages to build world without
>> a problem. When booted into multi-user mode, it's stable
>> and usable for anywhere from 1 to 3 hours, and then
>> panics. There are no active users on at the time, and the
>> machine is not heavily loaded (0.0-0.2)
>>
>> I suspected a hardware error, so swopped all the RAM from a
>> production machine, and it still produces the same fault.
>>
>> The error is
>> panic: vm_fault: fault on nofault entry, addr : f2572000
>
> This indicates an unmapped struct buf, should be a software bug.
>
>> Debugger ("panic")
>> Stopped at Debuger+0x37: movl $0,in_Debugger
>>
>> When I hit c, I get this :
>>
> Could you type in "bt" next time this happens, and post the result?
It's "t" in ddb, not "bt". Isn't consistency wonderful?
Khetan, you should also take a dump. The backtrace is a good start,
but it probably won't be enough to solve the problem.
Greg
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