Re: Issue with core dump

[Ralf Baechle <ralf@linux-mips.org>]

On Wed, Nov 02, 2011 at 12:03:39PM +0530, trisha yad wrote:

> Thanks all for your answer.
> 
> In loaded embedded system the time at with code hit do_user_fault()
> and core_dump_wait() is bit
> high, I check on my  system it took 2.7 sec. so it is very much
> possible that core dump is not correct.
> It  contain global value updated.
> 
> So is it possible at time of send_signal() we can stop modification of
> faulty thread memory ?

On existing hardware it is impossible to take a consistent snapshot of a
multi-threaded application at the time of one thread faulting.

A software simulator can handle this sort of race condition but of course
this approach has other disadvantages.

  Ralf