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SubjectBUG() kernel/timer.c:154 , aborting ide-scsi

I got this bug doing some testing with gnu vcdimager. I hit cntr
c to break to I could change disks. vcdimager was from cvs (today)
command was : vcdxrip --cdrom-device=/dev/scd0

Kernel is 2.5.62 from bitkeeper , pulled yesterday evening. Drive
is a SONY DRU 500A(X) firmware 2.0c


ide-scsi: abort called for 2982
ide-scsi: reset called for 2982
hdc: DMA disabled

kernel BUG at kernel/timer.c:154!
invalid operand: 0000
CPU: 0
EIP: 0060:[<c012271c>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010002
eax: 00000001 ebx: dfc96880 ecx: c03b05a0 edx: c04638e8
esi: dfc968a4 edi: c0265d09 ebp: c17c1eec esp: c17c1edc
ds: 007b es: 007b ss: 0068
Stack: c04638e8 00000000 dfc96880 00000092 c17c1f10 c0265c51 dfc968a4
c17c1f10 00000000 00000000 00000000 c04638e8 c17c1f40 c02662f2
c0265d09 00000032 00000000 dfc96880 c046383c 00000096 00000000
Call Trace:
[<c0265c51>] ide_set_handler+0x48/0x73
[<c02662f2>] do_reset1+0x211/0x22e
[<c0265d09>] atapi_reset_pollfunc+0x0/0x11a
[<c026633d>] ide_do_reset+0x2e/0x62
[<c028342c>] idescsi_reset+0xc3/0xf9
[<c027c9d8>] scsi_try_bus_device_reset+0x46/0x65
[<c027ca69>] scsi_eh_bus_device_reset+0x72/0xde
[<c027d251>] scsi_unjam_host+0xb0/0xe3
[<c010a0a2>] __down_failed_interruptible+0xa/0x10
[<c027d39d>] scsi_error_handler+0x119/0x16e
[<c027d284>] scsi_error_handler+0x0/0x16e
[<c0109039>] kernel_thread_helper+0x5/0xb
Code: 0f 0b 9a 00 a2 af 33 c0 eb bf 55 31 c0 89 e5 83 ec 10 89 75

>>EIP; c012271c <add_timer+5f/69> <=====

>>ecx; c03b05a0 <tvec_bases__per_cpu+0/101c>
>>edx; c04638e8 <ide_hwifs+928/54d8>
>>edi; c0265d09 <atapi_reset_pollfunc+0/11a>

Trace; c0265c51 <ide_set_handler+48/73>
Trace; c02662f2 <do_reset1+211/22e>
Trace; c0265d09 <atapi_reset_pollfunc+0/11a>
Trace; c026633d <ide_do_reset+2e/62>
Trace; c028342c <idescsi_attach+92/102>
Trace; c027c9d8 <scsi_try_bus_reset+17/dc>
Trace; c027ca69 <scsi_try_bus_reset+a8/dc>
Trace; c027d251 <scsi_error_handler+e1/16e>
Trace; c010a0a2 <__down_failed_interruptible+a/10>
Trace; c027d39d <scsi_reset_provider+5e/111>
Trace; c027d284 <scsi_error_handler+114/16e>
Trace; c0109039 <kernel_thread_helper+5/b>

Code; c012271c <add_timer+5f/69>
00000000 <_EIP>:
Code; c012271c <add_timer+5f/69> <=====
0: 0f 0b ud2a <=====
Code; c012271e <add_timer+61/69>
2: 9a 00 a2 af 33 c0 eb lcall $0xebc0,$0x33afa200
Code; c0122725 <add_timer+68/69>
9: bf 55 31 c0 89 mov $0x89c03155,%edi
Code; c012272a <add_timer_on+4/69>
e: e5 83 in $0x83,%eax
Code; c012272c <add_timer_on+6/69>
10: ec in (%dx),%al
Code; c012272d <add_timer_on+7/69>
11: 10 89 75 00 00 00 adc %cl,0x75(%ecx)

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