Re: 2.6.7: preempt + sysfs = BUG on ppc

[Andrew Morton]

Tom Vier <tmv@xxxxxxxxxxx> wrote:
>
> On Sun, Jun 20, 2004 at 02:49:06PM -0700, Andrew Morton wrote:
> > >  kernel BUG in fill_read_buffer at fs/sysfs/file.c:92!
> > 
> > Please add this patch, then retest:
> > 
> > --- 25/fs/sysfs/file.c~sysfs-overflow-debug	2004-06-20 14:44:44.272707136 -0700
> > +++ 25-akpm/fs/sysfs/file.c	2004-06-20 14:48:23.580367304 -0700
> 
> here ya go. it's /sys/class/net/eth1/wireless/beacon. that's for my airport
> card (apple branded lucent chip). i would look at its sysfs code, but i'm
> not familiar with it at all (and i'm busy).

What device driver is this thing using?

> 
> fill_read_buffer: show handler overrun
> ->show handler: 0xc010e38c (class_device_attr_show+0x0/0x48)
> kernel BUG in fill_read_buffer at fs/sysfs/file.c:99!
> Oops: Exception in kernel mode, sig: 5 [#1]
> PREEMPT 
> NIP: C00968EC LR: C00968EC SP: D19A7EA0 REGS: d19a7df0 TRAP: 0700    Not tainted
> MSR: 00029032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
> TASK = d1366d80[878] 'rsync' THREAD: d19a6000Last syscall: 3 
> GPR00: C00968EC D19A7EA0 D1366D80 00000001 00001AE3 FFFFFFFF C02D9674 C02D970C 
> GPR08: 0019377F C0290000 00000000 D19A6000 80008424 1004CFE4 00000000 00000004 
> GPR16: 10057B08 10040000 10057880 00000000 00001000 FFFFFFFF 00001000 00000000 
> GPR24: 00001000 00000000 00000000 00000000 C025DFCC CB2598FC C079F1A8 FFFFFFEA 
> NIP [c00968ec] fill_read_buffer+0xe0/0xf8
> LR [c00968ec] fill_read_buffer+0xe0/0xf8
> Call trace:
>  [c0096a6c] sysfs_read_file+0x5c/0x78
>  [c005ad68] vfs_read+0xdc/0x128
>  [c005afd8] sys_read+0x40/0x74
>  [c0005b20] ret_from_syscall+0x0/0x44
> 
> -- 
> Tom Vier <tmv@xxxxxxxxxxx>
> DSA Key ID 0x15741ECE
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