[dm-devel] dm panic debugging
Jonathan E Brassow
jbrassow at redhat.com
Mon Feb 21 16:49:39 UTC 2005
what are the test you are using. I have a couple machines here I could
probably have the tests running on.
brassow
On Feb 21, 2005, at 9:32 AM, Tim Burgess wrote:
> Hi All,,
>
> I'm trying to debug this panic that I emailed the list about the other
> day... I've gotten a little way with KDB - just wondering if there's
> someone familiar with the internals of dm-raid1 that I can bounce
> things off as I find them (lest something I find jog inspiration with
> someone who actually knows what's going on!).
>
> The crash occurs here in rh_dec(), called by mirror_end_io():
>
> if (atomic_dec_and_test(®->pending)) {
>
> Because reg is a null pointer, returned by __rh_lookup()
>
> That's as far as I have gotten so far :)
>
> The crash is not complicated to reproduce but it does take quite a
> while doing heavy i/o before it crops up. So it might be an hour or
> so before I can get back into my KDB session with the same problem
> (there is a deadlock problem as well triggered by the same steps).
>
> Anyway - if someone is willing to lend a hand please let me know!!!
>
> Cheers,
> Tim
>
> --
> tim.burgess at anu.edu.au ANU Supercomputer Facility
> Phone: +61 2 6125 1431 and APAC National Facility
> Fax: +61 2 6125 8199 Leonard Huxley Bldg (No. 56)
> Australian National University
> Canberra, ACT, 0200, Australia
>
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