Hi Tim,

Are you on Pharo 6 or 7? If in 7, what build are you using?

Pablo and Santi have made a fix 2 fridays ago (that I presume got integrated last week). The fix consists on changing a bit the exception handling during exception handling.

https://github.com/pharo-project/pharo/pull/1621/files

The fix seems simple, but it has a lot of information contained on it (like the fact that the system introduces exception handlers in the middle of the stack transparently to manage errors while stepping, or the fact that UnhandledError does another traversal of the stack but needs to start at the good place...). The Exception tests we had are still green, and we can now do stepping on code that raises exceptions. When stepping inside the DNU multiple times the debugging experience is not as smooth as the one in Pharo 3 (before it got broken) but this is FAR BETTER than Pharo7 since we have not experienced new infinite debuggers anymore :)...

I'll let Pablo and Santi answer more properly with the technical details.

On my side, I think we need to better document and do some more unit tests on that dark part of the system :).

On Mon, Aug 6, 2018 at 8:50 AM St��phane Ducasse <stephane.ducasse@inria.fr> wrote:
Hi tim

We know and we made huge progress because before we could not even reproduce it.��
We spent some times on it. I thought the solution found by pablo and santiago got integrated.

Stef

Guys - this really needs attention - I���ve spend hours now trying to debug some code and most of it is in closing infinite debuggers. It makes a mockery of our tagline - ���awesome debugging���. And the extra irony is that I���m debugging some file path stuff for exercism, to make it easier for hopefully more people to learn Pharo.

How can we get this fixed?

Tim

On 2 Aug 2018, at 21:44, Norbert Hartl <norbert@hartl.name> wrote:

bump

Am 04.07.2018 um 02:28 schrieb Martin McClure <martin@hand2mouse.com>:

On 07/03/2018 05:02 PM, Martin McClure wrote:
On 06/29/2018 07:48 AM, Guillermo Polito wrote:
I know that the exception handling/debugging has been modified several
times in the latest years (some refactorings, hiding contexts...), we
unfortunately don't have tests for it, so I'd like some more pair of
eyes on it. Ben, Martin could you take a look?

Hi Guille,
I'm just back from vacation last week, and about to go on vacation for
another week, but I'll see what I can see.
About the primitive pragmas for context-marking, I think some of those
were changed for the exception handling fix that Andres and I did a few
years back, so *could* be involved in this. I'd hate to see regression
in the exception handling in an attempt to fix this bug.


After a look at at the pull request, I'm quite sure that removing the
prim 199 marker is the wrong thing to do. Thanks, Pablo, for restoring
it! The start of execution of exception handlers must be marked in order
for #findNextHandlerContext to work correctly. If these contexts are not
marked, exceptions signaled from inside an exception handler can find
the wrong handler. See the code and comment in #findNextHandlerContext.

I'm afraid that I cannot immediately help with the debugger problem,
since I don't know the debugger nearly as well as I do the exception
handling code, and I'm going on vacation for a week in 20 minutes. :-)
Perhaps when I get back I can take a look at it if it is still a problem
by then.

Regards,
-Martin




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