I have the same problem. System is a Compaq Presario 5670 PII 450Mhz
256Mb.
uname -a
Linux x 2.6.20-16-386 #2 Thu Jun 7 20:16:13 UTC 2007 i686 GNU/Linux
[ 61.721609] i91u: PCI Base=0x2C00, IRQ=11, BIOS=0xFF000, SCSI ID=7
[ 61.721621] i91u: Reset SCSI Bus ...
[ 70.692146] BUG: soft lockup detected on CPU#0!
[ 70.692166] [<c0124598>] update_process_times+0x28/0x70
[ 70.692206] [<c010656a>] timer_interrupt+0x4a/0xb0
[ 70.692236] [<c0142c60>] handle_IRQ_event+0x30/0x60
[ 70.692266] [<c0144205>] handle_level_irq+0x55/0xc0
[ 70.692286] [<c0105680>] do_IRQ+0x40/0x80
[ 70.692304] [<c0104003>] common_interrupt+0x23/0x30
[ 70.692326] [<d086e1d5>] tul_reset_scsi+0x45/0x60 [initio]
[ 70.692353] [<d0870ed7>] i91u_detect+0x8c7/0x930 [initio]
[ 70.692389] [<d081a042>] init_this_scsi_driver+0x42/0xf2 [initio]
[ 70.692411] [<c0136157>] sys_init_module+0x157/0x17c0
[ 70.692464] [<c01207f0>] __request_region+0x0/0x60
[ 70.692492] [<c0103050>] syscall_call+0x7/0xb
[ 70.692515] =======================
00:06.0 SCSI storage controller [0100]: Initio Corporation 360P [1101:9500]
(rev 01)
Subsystem: Unknown device [9292:0202]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 64, Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at 2c00 [size=256]
Region 1: Memory at 41500000 (32-bit, non-prefetchable) [size=4K]
[virtual] Expansion ROM at 20160000 [disabled] [size=32K]
And following "sudo rmmod initio":
[ 5814.463551] Initio INI-9X00U/UW SCSI device driver; Revision: 1.04a did not
call scsi_unregister
[ 5814.463603] [<d0870ff9>] exit_this_scsi_driver+0xb9/0x10e [initio]
[ 5814.463668] [<c0137924>] sys_delete_module+0x134/0x1a0
[ 5814.463739] [<c02dd91f>] do_page_fault+0x33f/0x5f0
[ 5814.463874] [<c0102fc0>] sysenter_past_esp+0x69/0xa9
[ 5814.464017] =======================
--
[Feisty Beta] Soft lockup (initio module)
https://bugs.launchpad.net/bugs/103076
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