Linux-kernel mailing list archive 1999-32,: Re: Kernel Panic: scsi_free:Trying to free unused memory

# Re: Kernel Panic: scsi_free:Trying to free unused memory

Alan Cox (alan@lxorguk.ukuu.org.uk)
Sun, 8 Aug 1999 16:17:59 +0100 (BST)

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> I am getting similar error but "In swapper task - not syncing"!

What matters are the liens before it.

> Basically this is reproducable and always happens when I write to tape
> (AH 1542C).
>
> Detected scsi disk sdc at scsi0, channel 0, id 2, lun 0
> Vendor: HP Model: C1533A Rev: AN04
> Type: Sequential-Access ANSI SCSI revision: 02
>
> Since I am using the standard RH 6.0 kernel and 486 board makes mee
> think might be kernel related.

It could well be, although almost all the scsi layer fixes are SMP specific.
The other one to watch is that the AHA1542 card doing bus mastering ISA
DMA is capable of holding off memory refresh on older machines. This is why
there is an option in the jumpers/bios to set the DMA rate. Drop that to the
lowest (5Mbytes/sec) and retry

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