Re: Stuck gnat1 processes

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On Thu, Jun 9, 2011 at 9:30 PM, John David Anglin
<dave@xxxxxxxxxxxxxxxxxx> wrote:
> Here is another wierd bug -- four gnat1 process stuck at exactly the
> same location making zero forward progress.  I have seen this a number
> of times, so I thought it would be useful to report.
>
> As far as I can tell, all are stuck in the kernel.  Gdb can't step
> the code, nor do breaks on the next instruction ever get hit.  This
> may have something to do with the fact that the instruction is trying
> to read from text (C switch statement).
>
> This is with 2.6.39.1 with James' last two, but I have also seen this
> without the patches.  Machine is rp3440.

This looks like a combination of multiple bugs, the process is
probably dead, or not running, which is why gdb can't do anything with
it. I'm surprised the ptrace API isn't returning some more diagnostics
about the stuck process.

Cheers,
Carlos.
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