Fwd: stop scheduler in panic context

[Andriy Gapon]

This is a reminder that if you would like to see the code for sane panic(9)
context in 9.0, then I still need at least one independent reviewer and tester for
the code.  Thank you.

on 25/06/2011 17:37 Andriy Gapon said the following:
> 
> I would like to ask for testing of the following patch.
> Since the patch affects panic(9) context, then obviously its testing requires
> getting some sort of panic, and preferably some sort of "post-panic" activity too:
> doing something in kdb, dumping a core (via debugger command or in unattended
> mode), resetting a machine finally.
> 
> At minimum I hope that no regressions are introduced.
> At maximum I hope that some things are improved like, e.g., crash dump succeeding
> where it failed before (PR amd64/139614).
> 
> The patch is for recent head/CURRENT.  It mostly affects SMP systems, but also has
> a smaller impact on UP systems.
> I can try to adapt it to stable/8, if sufficient interest arises.
> Please see the following message for the patch and some more details.
> 
> -------- Original Message --------
> 
> I would like to present the following diff for review and discussion:
> http://people.freebsd.org/~avg/stop_scheduler_on_panic.diff
> 
> The idea is to stop scheduler in a panic context and to provide a special
> environment for the only running thread, the one that called panic(9).
> 
> I tried to make this diff as minimal as possible, it doesn't include changes that
> I consider to be useful improvements and [even] bug fixes, but which generated
> controversy in non-public discussions.
> 
> If there is no negative feedback within next few days, then I plan to post the
> patch to current@ to solicit some testing.  I will definitely wait for positive
> feedback before committing this change.  I hope that I will be able to sneak it
> into the 9 release (unless there are objections to this).
> 
> Thank you!


-- 
Andriy Gapon