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Subjectbug at buffer.c:2513
Kernel 2.4.21-pre4 told me it has a bug in buffer.c:2513.  The relevant
lines of fs/buffer.c are

2512: if (size < 512 || size > PAGE_SIZE)
2513: BUG();

I'm running kernel 2.4.21-pre4 compiled for i386 on a natsemi geode gx1
with ns cs5530a (Acrosser AR-B1565, I was running rsync at
the time of the bug message. Below is the bug message:

kernel BUG at buffer.c:2513!
invalid operand: 0000
CPU: 0
EIP: 0010:[<c01340cf>] Not tainted
EFLAGS: 00010286
eax: c6000e00 ebx: 00000000 ecx: 00000200 edx: 00000000
esi: 00000300 edi: c6001000 ebp: 00000300 esp: c5959e3c
ds: 0018 es: 0018 ss: 0018
Process rsync (pid: 161, stackpage=c5959000)
Stack: 00000000 00000300 c6001000 00120087 c0132209 00000300 00120087
c78ec800 00000480 c1637ac0 00083780 c01323f4 00000300 00120087
00000300 c01554d0 00000300 00120087 c6001000 00000024 00120087
Call Trace: [<c0132209>] [<c01323f4>] [<c01554d0>] [<c0155e60>]
[<c0155f04>] [<c015abe7>] [<c0155fcf>] [<c0142393>] [<c012697d>]
[<c01308fc>] [<c0108967>]

Code: 0f 0b d1 09 5a 6a 27 c0 b9 ff ff ff ff 41 89 f8 d3 e0 3d ff
rsync: connection unexpectedly closed (802675 bytes read so far)
rsync error: error in rsync protocol data stream (code 12) at io.c(150)

If anyone is interested, I can provide details about my kernel config
and run experiments. I'd like to be a proper kernel-hacker, figure this
out myself, and be generally cool; however, I need to finish my degree
before my advisor notices I'm posting on lkml.

Please cc me (komarek_at_cmu_edu) on any messages you want me to read.

-Paul Komarek
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