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Date: Thu, 30 Nov 2000 14:07:51 -0500 (EST)
From: Alexander Viro <viro@math.psu.edu>
To: Jonathan Hudson <jonathan@daria.co.uk>
cc: linux-kernel@vger.kernel.org
Subject: Re: corruption
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On Thu, 30 Nov 2000, Jonathan Hudson wrote:

> 
> In article <3A26625E.446AE3D@uow.edu.au>,
> 	Andrew Morton <andrewm@uow.edu.au> writes:
> AM> In thread "File corruption part deux", Lawrence Walton wrote:
> >> 
> >> my system has been acting slightly odd on all the pre 12 kernels
> >> with the fs going read only with out any messages until now.
> >> no opps or anything like that, but I did get this just now.
> >> 
> >> EXT2-fs error (device sd(8,2)): ext2_readdir:
> >> bad entry in directory #458430: directory entry
> >> across blocks - offset=152, inode=3393794200,
> >> rec_len=12440, name_len=73
> >>
> AM> 
> AM> 3393794200 == 0xca493098.  A kernel address. And 152 is 0x98,
> AM> which is equal to N * 0x20 + 0x18. Read on...
> AM> 
> 
> Don't know what these do for your analysis, observed on
> 2.4.0test12pre2, compiling mozilla. 
> 
>  EXT2-fs error (device ide0(3,11)):
>    ext2_readdir: bad entry in directory #409870: directory entry across blocks
>    - offset=88, inode=3284439128, rec_len=36952, name_len=196

offset 0x58, data: 58 90 c4 c3 58 90 c4

Confirms. That's definitely an empty list_head at address 0xc3c49058 and -pre2
has O_SYNC patches.

>  EXT2-fs error (device ide0(3,11)): 
>    ext2_add_entry: bad entry in directory #344273: rec_len % 4 != 0 - offset=0, 
>    inode=1769234798, rec_len=28271, name_len=85

data: 6e 61 74 69 6f 6e 55, i.e. "nationU"

... and that one looks like a duplicated blocks effect, but there may be a lot
of other reasons for that.

> Recompiling it with 2.4.0test12pre3 last night did not cause any fs
> problems, at least that I've noticed.

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