How do I attach `gdb` and or `valgrind` to the test process Pants #general

How do I attach `gdb` and/or `valgrind` to the tes...

rhythmic-morning-87313

08/06/2022, 5:44 AM

How do I attach

gdb

and/or

valgrind

to the test process when running

./pants test

? Is there any recommended way?

rhythmic-morning-87313

08/06/2022, 5:45 AM

I'm going to debug a potential memory corruption caused by one of our 3rd-party native module dependencies

rhythmic-morning-87313

08/06/2022, 5:49 AM

Just running

gdb --args ./pants test --debug ...

does not work because

pants

is a script not an executable (obviously!)

rhythmic-morning-87313

08/06/2022, 5:50 AM

Probably I need to figure out which Python interpreter that

./pants

script detects and selects, and mimic all the arguments passed to it, but I think this will be just the pants itself not the Python process that actually runs pytest.

rhythmic-morning-87313

08/06/2022, 5:50 AM

It would be great if we have a simpler way to "inject" invocation of

gdb

valgrind

when running a specific target.

rhythmic-morning-87313

08/06/2022, 6:08 AM

It seems to be possible that I can "attach" the pytest process in gdb, but I'm not sure that how this would affect the Pants engine.

bitter-ability-32190

08/06/2022, 10:39 AM

Two things: •

test

and

run

now have

--debug-adapter

flag which if supported launches the relevant debug adapter. In this case though it's be launching the Python one, and not a native one (although that support could be added, but less useful in most cases) • You probably wanna run

./pants --no-proccess-cleanup test --force ...

And use the sandbox to run

gdb ...

fast-nail-55400

08/09/2022, 8:10 PM

Another solution could be to allow injecting a “prefix” to any process invocation. For the immediate issue, if you are willing to edit a copy of the pants sources, you could just hard code what you want and invoke Pants using the checked out copy of Pants.

6 Views

Open in Slack

Previous Next