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SubjectRe: BUG and Kernel Panic on 2.5.2-pre1 with loop and cdrom
Sorry the previous emails didn't help much, here is a properly decoded oops as well as a
printout of the values before the BIO_BUG_ON.

ll_rw_blk.c
static int end_bio_bh_io_sync(struct bio *bio, int nr_sectors)
{
struct buffer_head *bh = bio->bi_private;
printk(KERN_DEBUG "%s: nr_sectors=%d bh->b_size=%d\n", __FUNCTION__, nr_sectors, (bh->b_size >> 9));
BIO_BUG_ON(nr_sectors != (bh->b_size >> 9)); <== BUG tripped here
bh->b_end_io(bh, test_bit(BIO_UPTODATE, &bio->bi_flags));
bio_put(bio);
return 0;
}

Jan 1 02:01:02 mondecino kernel: loop: loaded (max 8 devices)
Jan 1 02:01:02 mondecino kernel: VFS: Disk change detected on device fd(2,0)
Jan 1 02:01:02 mondecino kernel: end_bio_bh_io_sync: nr_sectors=8 bh->b_size=8
Jan 1 02:01:02 mondecino last message repeated 3 times
Jan 1 02:01:03 mondecino kernel: end_bio_bh_io_sync: nr_sectors=2 bh->b_size=2
Jan 1 02:01:03 mondecino kernel: end_bio_bh_io_sync: nr_sectors=8 bh->b_size=8

invalid operand: 0000
CPU: 0
EIP: 0010:[<c020c065>] Not tainted
EFLAGS: 00010286
eax: 00000020 ebx: c88db1a4 ecx: c0304cc4 edx: 000025e1
esi: cae38c64 edi: cae95000 ebp: 00000000 esp: c8adff9c
ds: 0018 es: 0018 ss: 0018
Process loop0 (pid: 697, stackpage=c8adf000)
Stack: c02e1c03 00000554 cae38c64 cae38f64 c014dd33 cae38c64 00000000 cc9170a2
cae38c64 00000001 00000000 cae95000 cae38f64 cae38c64 00000000 00000000
00000000 c1560018 00000f00 ca13bf30 00000000 c0107286 cae95000 cc916e80
Call Trace: [<c014dd33>] [<cc9170a2>] [<c0107286>] [<cc916e80>]

Code: 0f 0b 58 5a 8b 46 0c 83 e0 01 50 53 ff 53 34 56 e8 b6 14 f4

>>EIP; c020c065 <end_bio_bh_io_sync+25/50> <=====
Trace; c014dd33 <bio_endio+23/30>
Trace; cc9170a2 <[loop]loop_thread+222/280>
Trace; c0107286 <kernel_thread+26/30>
Trace; cc916e80 <[loop]loop_thread+0/280>
Code; c020c065 <end_bio_bh_io_sync+25/50>
00000000 <_EIP>:
Code; c020c065 <end_bio_bh_io_sync+25/50> <=====
0: 0f 0b ud2a <=====
Code; c020c067 <end_bio_bh_io_sync+27/50>
2: 58 pop %eax
Code; c020c068 <end_bio_bh_io_sync+28/50>
3: 5a pop %edx
Code; c020c069 <end_bio_bh_io_sync+29/50>
4: 8b 46 0c mov 0xc(%esi),%eax
Code; c020c06c <end_bio_bh_io_sync+2c/50>
7: 83 e0 01 and $0x1,%eax
Code; c020c06f <end_bio_bh_io_sync+2f/50>
a: 50 push %eax
Code; c020c070 <end_bio_bh_io_sync+30/50>
b: 53 push %ebx
Code; c020c071 <end_bio_bh_io_sync+31/50>
c: ff 53 34 call *0x34(%ebx)
Code; c020c074 <end_bio_bh_io_sync+34/50>
f: 56 push %esi
Code; c020c075 <end_bio_bh_io_sync+35/50>
10: e8 b6 14 f4 00 call f414cb <_EIP+0xf414cb> c114d530 <_end+d6c100/c444c30>


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