Thinkpad panic woes (was Re: CDRW causes Thinkpad T41 to panic)
eischen at vigrid.com
Thu Jun 10 19:36:10 GMT 2004
On Thu, 10 Jun 2004, Alexander Marx wrote:
> Daniel Eischen wrote:
> > My drive is on ata1-master, not the slave. From what I can see,
> > the failure for ata1-slave at boot up isn't a problem because
> > there is no device present on that channel. Once booted, I was
> > able to use xmcd and play an audio CD on it, so it is at least
> > working well enough for that. 5.2.1-RELEASE doesn't show the
> > "ata1-slave FAILURE - ATAPI_IDENTIFY" message and booted just
> > fine -- there were no "Memory modified after free" messages
> > (and panic). I did have to disable ACPI in order to get
> > 5.2.1-RELEASE to work, though.
> well, i've the very same problem here with a my thinkpad t40.
> 5.2.1 works only w/o acpi, 5.2 and -CURRENT (as of yesterday)
> do not work at all with the cd/dvd present.
> the panic w/ trace and a dmesg (boot -v but w/o cd/dvd)
> is available here:
>  http://www.madness.at/~mad/tp40panic/
> > The "memory modified after free" bothers me. It indicates
> > that either something is running amok with pointers, or that
> > references are still being made after memory is free()'d.
> > I've been trying to track it down, but I haven't had any
> > luck so far. Anyone have any ideas on how to debug this?
> i tried to track the alloc/free's with some printf's
> and discovered, that setting the retries=1 in ata-all.c
> fixed it the panic in -current; my -current then boots with
> acpi enabled and the cd/dvd present, without problem.
Yeah, that's where I was looking. My theory is that after
the first try fails, memory is freed, but re-used in the
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