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Date:   Thu, 30 Nov 2000 18:52:17 -0600
From:   Russell Cattelan <cattelan@thebarn.com>
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To:     utz lehmann <xfs@s2y4n2c.de>
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Subject: Re: kernelcrash during root filesystem recovery
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utz lehmann wrote:

Hmm not good.
We are going to need a bit more go to on.

Can you get a backtrace from kdb?

If you could hook up to a serial console that would
help in capturing the output.


> hi
>
> i found a bug in yesterdays (2000-11-29) kernel (the test11 one).
>
> i had powered off my computer without a clean shutdown. i do this very
> often, no problems since month with xfs.
>
> the kernel traped into kdb while recovering the xfs root filesystem. i write
> the messages down from the screen, maybe there are typos:
>
> XFS: WARNING: recovery required on readonly filesystem.
>
> XFS: write access will be enabled recovery.
>
> Staring XFS recovery on filesystem: ide0 (3,6) (dev:3/6)
> Unable to handle kernel NULL pointer dereference at virtual address 00000008
>  printing eip:
> c016482b
> *pde = 00000000
>
> Entering kdb (currect=0xc125c000, pid1) Panic: Oops
> due to panic @ 0xc016482b
> eax = 0x00000000 ebx = 0xc12c3460 ecx = 0xc12c3460 edx = 0x00000000
> esi = 0xc12c0e60 edi = 0x00000000 esp = 0xc125d940 eip = 0xc016482b
> ebp = 0x00000000 xss = 0x00000018 xcs = 0x00000010 eflags = 0x00010246
> xds = 0x00000018 xes = 0x00000018 origeax = 0xffffffff &regs = 0xc125d90c
>
> i rebooted the machine with the same result.
> rebooting with a kernel from 2000-11-14 works with no problems.
>
> i made some tests with the buggy kernel:
>
> clean shutdown works.
> hardreset after "sync" works.
> hardreset after booting without sync works.
> hardreset during booting works.
> hardreset during writing (cp -av /usr/src/linux /tmp) triggers the bug.
> 4 times it traped into kdb, 1 time the kernel hangs.
>
> booting with the older kernel always works.
>
> my system:
> K6-500, 128MB
> xfs root filesystem on a ide disk.
>
> hope that helps.
>
> utz