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    SubjectRe: 2.6.7: preempt + sysfs = BUG on ppc
    Tom Vier <tmv@comcast.net> 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@comcast.net>
    > DSA Key ID 0x15741ECE
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