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Subject2.5.64-mm6: kernel BUG at kernel/timer.c:155!
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Date
I was reading back a freshly burned CD from my shiny new Plexwriter
48/24/48A. I'm using ide-scsi, so this is an iso9660 filesystem mounted
from /dev/scd0. After reading for a while, apparently successfully, it
started failing with the messages below:

spurious 8259A interrupt: IRQ7.
hdc: lost interrupt
ide-scsi: CoD != 0 in idescsi_pc_intr
ide-scsi: abort called for 9677
ide-scsi: abort called for 9674
hdc: ATAPI reset complete
hdc: irq timeout: status=0x80 { Busy }
hdc: ATAPI reset complete
hdc: irq timeout: status=0x80 { Busy }
hdc: ATAPI reset complete
hdc: irq timeout: status=0x80 { Busy }
hdc: status timeout: status=0x80 { Busy }
hdc: drive not ready for command
hdc: ATAPI reset complete
hdc: irq timeout: status=0x80 { Busy }
hdc: ATAPI reset complete
hdc: irq timeout: status=0x80 { Busy }
hdc: status timeout: status=0x80 { Busy }
hdc: drive not ready for command
hdc: ATAPI reset complete
hdc: irq timeout: status=0x80 { Busy }
hdc: ATAPI reset complete
hdc: irq timeout: status=0x80 { Busy }
hdc: status timeout: status=0x80 { Busy }
hdc: drive not ready for command
hdc: ATAPI reset complete
hdc: irq timeout: status=0x80 { Busy }
hdc: ATAPI reset complete
hdc: irq timeout: status=0x80 { Busy }
hdc: status timeout: status=0x80 { Busy }
hdc: drive not ready for command
hdc: ATAPI reset complete
ide-scsi: abort called for 9674
ide-scsi: abort called for 9675
ide-scsi: abort called for 9676
ide-scsi: reset called for 9677
------------[ cut here ]------------
kernel BUG at kernel/timer.c:155!
invalid operand: 0000 [#1]
CPU: 0
EIP: 0060:[<c011fc41>] Tainted: PF
EFLAGS: 00010002
EIP is at add_timer+0xdb/0xe8
eax: 00000001 ebx: c1b3b5e4 ecx: c0322820 edx: c03d33fc
esi: 00000096 edi: c020b506 ebp: f7d8feac esp: f7d8fea4
ds: 007b es: 007b ss: 0068
Process scsi_eh_0 (pid: 9, threadinfo=f7d8e000 task=c1b7cd00)
Stack: 00000001 c1b3b5c0 f7d8fed0 c020b44c c1b3b5e4 00000000 00000082 00000000
00000000 c03d33fc c03d33fc f7d8ff00 c020baf4 c03d33fc c020b506 00000032
00000000 c1b3b5c0 c03d3350 00000096 00000000 c03d33fc c03d340c f7d8ff18
Call Trace:
[<c020b44c>] ide_set_handler+0x48/0x74
[<c020baf4>] do_reset1+0x214/0x232
[<c020b506>] atapi_reset_pollfunc+0x0/0x11a
[<c020bb40>] ide_do_reset+0x2e/0x62
[<c02267b4>] idescsi_reset+0xc0/0xf6
[<c0220a36>] scsi_try_bus_device_reset+0x46/0x66
[<c0220abb>] scsi_eh_bus_device_reset+0x65/0x108
[<c0221224>] scsi_eh_ready_devs+0x28/0x74
[<c022137f>] scsi_unjam_host+0xa1/0xa4
[<c022142f>] scsi_error_handler+0xad/0xdc
[<c0221382>] scsi_error_handler+0x0/0xdc
[<c0107209>] kernel_thread_helper+0x5/0xc
Code: 0f 0b 9b 00 62 11 2e c0 e9 41 ff ff ff 55 31 c0 89 e5 83 ec



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