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SubjectRe: 2.4.21-rc6 ide-scsi bug?
On Sat, 31 May 2003, Alexandre Pereira Nunes wrote:

> Hi,
>
> My system (athlon on an asus mb with via kt133 chipset) is currently
> running 2.4.21-rc6 (but I had similar behaviour with 2.4.21-rc2-ac2),
> and I map my ide cdrom to ide-scsi by passing option ide-cd ignore in
> modules.conf (devfs is enabled, so that the modules load at /dev/cdrom
> request).
>
> Sometimes my cd drive (actually a mdma2 enabled combo dvd reader/cdrw
> writer lg 4120B) seems to 'sleep' after a long time of inactivity and
> waking it up (i.e. by trying to mount the unit) takes a time, so
> eventually the system has to do a "soft" bus reset so that it comes to
> life again (maybe it actually does that because the drive takes too long
> to wake up by itself, but I don't know). If I use ide-cd instead of
> ide-scsi, it happens as described and the system works ok (the kernel
> prints dma disabled but if I enable it back it works fine), but with
> ide-scsi, after the kernel prints that atapi reset and dma disabled
> stuff, the system hangs. nothing else is printed, and my caps lock and
> scroll lock keys starts blinking, so it seems to be a serious kernel
> panic, but nothing about that is printed on the screen even when I'm at
> console.
>
> Older kernels i've tried (2.4.20 and 2.4.21-pre7) seems to behave ok.
>
> I work around by using ide-cd until I need ide-scsi for something (like
> tunning the rpc2 features on the drive to change region settings for dvd
> playing), and replacing the driver by hand after making sure the drive
> is ok, but that actually sucks :-)

I've just had this problem twice today when trying to cat /dev/scd0 past the
end of the DVD. It would stop after sector 716744 (1024-byte sectors) and hang
completely. After 1 minute, the device would do a soft reset and instantly I
get an oops, and the caps/scroll lock keys would start blinking. Couldn't save
the oops because of the panic in the interrupt handler.

This happened because I had written a 700MB file raw to the cd prior (716800
sectors total) and I wanted to read the whole thing back to make sure it was
stored successfully. Now I'm out in the mkisofs code trying to figure out what
kind of padding I need at the end of the 700MB so it'll read the rest of it.

Note that a non ide-scsi device will just report I/O Error after reading the
end of the CD, however with an ide-scsi device, it will either hang or crash.

I'm currently using 2.4.20-pre5-ac1 with Andre Hedrick's IDE Patch applied. So,
I assume this has been around for some time. Thanks for sending your email--now
I know not to upgrade just yet.

I hope this is of help to someone. :)

-Byron

--
Byron Stanoszek Ph: (330) 644-3059
Systems Programmer Fax: (330) 644-8110
Commercial Timesharing Inc. Email: byron@comtime.com

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