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SubjectRe: BUG and Kernel Panic on 2.5.2-pre1 with loop and cdrom
Here is the floppy case with some debugging stuff put in. My kernel log is first, orignal
oops second and decoded oops last. Triggered with mount /dev/fd0 /floppy -o loop.
The ksymoops was run on the machine *right* after the oops (it was still
alive). If you want me to track down where the bh->b_size and nr_sectors
began to differ i can put extra checks further down.

Thanks,
Zwane Mwaikambo

Dec 31 02:09:27 mondecino kernel: end_bio_bh_io_sync: nr_sectors=0 bh->b_size=2 <== the values before the BUG check
Dec 31 02:09:27 mondecino kernel: kernel BUG at ll_rw_blk.c:1367!
Dec 31 02:09:27 mondecino kernel: invalid operand: 0000
Dec 31 02:09:27 mondecino kernel: CPU: 0
Dec 31 02:09:27 mondecino kernel: EIP: 0010:[end_bio_bh_io_sync+77/112] Not tainted
Dec 31 02:09:27 mondecino kernel: EIP: 0010:[<c020c08d>] Not tainted
Dec 31 02:09:27 mondecino kernel: EFLAGS: 00010282
Dec 31 02:09:27 mondecino kernel: eax: 00000020 ebx: c8a92384 ecx: c0304d24 edx: 00002b24
Dec 31 02:09:27 mondecino kernel: esi: 00000000 edi: cb6fcc64 ebp: 00000000 esp: c8bfbf88
Dec 31 02:09:27 mondecino kernel: ds: 0018 es: 0018 ss: 0018
Dec 31 02:09:27 mondecino kernel: Process loop0 (pid: 727, stackpage=c8bfb000)
Dec 31 02:09:27 mondecino kernel: Stack: c02e1c63 00000557 cb6fcc64 caf4ac24 c9116000 c014dd33 cb6fcc64 00000000
Dec 31 02:09:27 mondecino kernel: cc9171f8 cb6fcc64 00000001 00000000 cc9187c8 cc91879d 00000000 c9116000
Dec 31 02:09:27 mondecino kernel: caf4ac24 cb6fcc64 c8fcbf30 00000000 00000000 00000000 00000f00 c8fcbf30
Dec 31 02:09:27 mondecino kernel: Call Trace: [bio_endio+35/48] [sound:num_midis_Rsmp_a1eae7cf+815152/51255793] [sound:nu
m_midis_Rsmp_a1eae7cf+820736/51250209] [sound:num_midis_Rsmp_a1eae7cf+820693/51250252] [kernel_thread+38/48]
Dec 31 02:09:27 mondecino kernel: Call Trace: [<c014dd33>] [<cc9171f8>] [<cc9187c8>] [<cc91879d>] [<c0107286>]
Dec 31 02:09:27 mondecino kernel: [sound:num_midis_Rsmp_a1eae7cf+814520/51256425]
Dec 31 02:09:27 mondecino kernel: [<cc916f80>]
Dec 31 02:09:27 mondecino kernel:
Dec 31 02:09:27 mondecino kernel: Code: 0f 0b 5e 58 8b 47 0c 83 e0 01 50 53 ff 53 34 57 e8 8e 14 f4

invalid operand: 0000
CPU: 0
EIP: 0010:[<c020c08d>] Not tainted
EFLAGS: 00010282
eax: 00000020 ebx: c8a92384 ecx: c0304d24 edx: 00002b24
esi: 00000000 edi: cb6fcc64 ebp: 00000000 esp: c8bfbf88
ds: 0018 es: 0018 ss: 0018
Process loop0 (pid: 727, stackpage=c8bfb000)
Stack: c02e1c63 00000557 cb6fcc64 caf4ac24 c9116000 c014dd33 cb6fcc64 00000000
cc9171f8 cb6fcc64 00000001 00000000 cc9187c8 cc91879d 00000000 c9116000
caf4ac24 cb6fcc64 c8fcbf30 00000000 00000000 00000000 00000f00 c8fcbf30
Call Trace: [<c014dd33>] [<cc9171f8>] [<cc9187c8>] [<cc91879d>] [<c0107286>]
[<cc916f80>]

>>EIP; c020c08d <end_bio_bh_io_sync+4d/70> <=====
Trace; c014dd33 <bio_endio+23/30>
Trace; cc9171f8 <[loop]loop_thread+278/2d0>
Trace; cc9187c8 <[loop].text.end+689/8a1>
Trace; cc91879d <[loop].text.end+65e/8a1>
Trace; c0107286 <kernel_thread+26/30>
Trace; cc916f80 <[loop]loop_thread+0/2d0>
Code; c020c08d <end_bio_bh_io_sync+4d/70>
00000000 <_EIP>:
Code; c020c08d <end_bio_bh_io_sync+4d/70> <=====
0: 0f 0b ud2a <=====
Code; c020c08f <end_bio_bh_io_sync+4f/70>
2: 5e pop %esi
Code; c020c090 <end_bio_bh_io_sync+50/70>
3: 58 pop %eax
Code; c020c091 <end_bio_bh_io_sync+51/70>
4: 8b 47 0c mov 0xc(%edi),%eax
Code; c020c094 <end_bio_bh_io_sync+54/70>
7: 83 e0 01 and $0x1,%eax
Code; c020c097 <end_bio_bh_io_sync+57/70>
a: 50 push %eax
Code; c020c098 <end_bio_bh_io_sync+58/70>
b: 53 push %ebx
Code; c020c099 <end_bio_bh_io_sync+59/70>
c: ff 53 34 call *0x34(%ebx)
Code; c020c09c <end_bio_bh_io_sync+5c/70>
f: 57 push %edi
Code; c020c09d <end_bio_bh_io_sync+5d/70>
10: e8 8e 14 f4 00 call f414a3 <_EIP+0xf414a3> c114d530 <_end+d6c100/c444c30>


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