Subject: Re: [PATCH v5 10/10] selftests/harness: Handle TEST_F()'s explicit exit codes

From: Mickaël Salaün <[email-masked]>
Date: Mon, 6 May 2024 18:22:25 +0200

On Fri, May 03, 2024 at 07:17:16AM GMT, Sean Christopherson wrote:
> On Fri, May 03, 2024, Mickaël Salaün wrote:
> > If TEST_F() explicitly calls exit(code) with code different than 0, then
> > _metadata->exit_code is set to this code (e.g. KVM_ONE_VCPU_TEST()).  We
> > need to keep in mind that _metadata->exit_code can be KSFT_SKIP while
> > the process exit code is 0.
> > 
> > Initial patch written by Sean Christopherson [1].
> 
> Heh, my pseudo patch barely has any relevance at this point.  How about replacing
> that with:
> 
>   Reported-by: Sean Christopherson <[email-masked]>
>   Closes: https://lore.kernel.org/r/[email-masked]
> 
> > Cc: Jakub Kicinski <[email-masked]>
> > Cc: Kees Cook <[email-masked]>
> > Cc: Mark Brown <[email-masked]>
> > Cc: Sean Christopherson <[email-masked]>
> > Cc: Shuah Khan <[email-masked]>
> > Cc: Will Drewry <[email-masked]>
> > Link: https://lore.kernel.org/r/[email-masked] [1]
> > Fixes: 0710a1a73fb4 ("selftests/harness: Merge TEST_F_FORK() into TEST_F()")
> > Signed-off-by: Mickaël Salaün <[email-masked]>
> > Link: https://lore.kernel.org/r/[email-masked]
> > ---
> > 
> > Changes since v4:
> > * Check abort status when the grandchild exited.
> > * Keep the _exit(0) calls because _metadata->exit_code is always
> >   checked.
> > * Only set _metadata->exit_code to WEXITSTATUS() if it is not zero.
> > 
> > Changes since v3:
> > * New patch mainly from Sean Christopherson.
> > ---
> >  tools/testing/selftests/kselftest_harness.h | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
> > index eb25f7c11949..7612bf09c5f8 100644
> > --- a/tools/testing/selftests/kselftest_harness.h
> > +++ b/tools/testing/selftests/kselftest_harness.h
> > @@ -462,9 +462,13 @@ static inline pid_t clone3_vfork(void)
> >  		munmap(teardown, sizeof(*teardown)); \
> >  		if (self && fixture_name##_teardown_parent) \
> >  			munmap(self, sizeof(*self)); \
> > -		if (!WIFEXITED(status) && WIFSIGNALED(status)) \
> > +		if (WIFEXITED(status)) { \
> > +			if (WEXITSTATUS(status)) \
> > +				_metadata->exit_code = WEXITSTATUS(status); \
> 
> Ah, IIUC, this works because __run_test() effectively forwards the exit_code?
> 
> 	} else if (t->pid == 0) {
> 		setpgrp();
> 		t->fn(t, variant);
> 		_exit(t->exit_code);
> 	}

Yes

> 
> Tested-by: Sean Christopherson <[email-masked]>

OK, I'll send a v6. We really need to get this into -next.

> 
> > +		} else if (WIFSIGNALED(status)) { \
> >  			/* Forward signal to __wait_for_test(). */ \
> >  			kill(getpid(), WTERMSIG(status)); \
> > +		} \
> >  		__test_check_assert(_metadata); \
> >  	} \
> >  	static void __attribute__((constructor)) \
> > -- 
> > 2.45.0
> > 
>