934040 - Can't run mochitests under gdb, again

Status: RESOLVED DUPLICATE of bug 914925

(Testing :: Mochitest, defect)

Description

[Boris Zbarsky [:bzbarsky]]

Changeset: https://hg.mozilla.org/integration/mozilla-inbound/rev/ac2b3068888b

Steps to reproduce:

mach mochitest-plain --no-autorun --debugger gdb dom/tests/mochitest/ajax/jquery/test_jQuery.html

or

../obj-firefox/_virtualenv/bin/python ../obj-firefox/_tests/testing/mochitest/runtests.py --test-path=dom/tests/mochitest/ajax/jquery/test_jQuery.html --debugger=gdb

in both cases, as soon as the app starts under gdb I get:

  Program exited with code 06.

If I manually hack SetExceptionHandler in nsExceptionHandler.cpp to be a no-op, things work fine.

Blocker, because debugging things is kind of necessary.  :(

Comment 1

[Mike Hommey [:glandium]]

FWIW, build/automation.py does the right thing, but it looks like mochitest's runner doesn't use that anymore. So that looks like fallout from bug 746243

Comment 2

[(not currently active) Ted Mielczarek]

This is Mac? That's bug 914925. I have a patch there but I haven't figured out how to make it not break other things yet.

Comment 3

[Boris Zbarsky [:bzbarsky]]

This is on Mac, yes.

Is there at least something we could do to make it possible to manually tell the harness to turn off breakpad?  Having to hack random C++ bits just to debug a reftest or mochitest is ... bad.

Comment 4

[Mike Hommey [:glandium]]

Just set MOZ_CRASHREPORTER_DISABLE=1 in the environment. That's what automation.py does when you make it run a debugger. That's what mochitest harness should do too.

Comment 5

[Boris Zbarsky [:bzbarsky]]

> Just set MOZ_CRASHREPORTER_DISABLE=1 in the environment

  env MOZ_CRASHREPORTER_DISABLE=1 ../mozilla/mach mochitest-plain --debugger gdb dom/tests/mochitest/ajax/jquery/test_jQuery.html
...
Program exited with code 06.
(gdb) 

Same thing with the manual runtests.py invocation.

As in, something in the harness clobbers that env var, and I see no way to tell it not to do that.

Comment 6

[Joel Maher ( :jmaher ) (UTC -8)]

is this still an issue, I know that nfroyd did some work on debuggers and mochitests in the last couple months.

Comment 7

[Boris Zbarsky [:bzbarsky]]

This got fixed in bug 914925.