Re: [dm-devel] dm panic debugging

[Jonathan E Brassow <jbrassow redhat com>]

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(&reg->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 anu edu au         ANU Supercomputer Facility
>    Phone: +61 2 6125 1431           and APAC National Facility
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>                                     Australian National University
>                                     Canberra, ACT, 0200, Australia
>
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