[PATCH v4 RESEND 1/7] kunit: Handle thread creation error

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Previously, if a thread creation failed (e.g. -ENOMEM), the function was
called (kunit_catch_run_case or kunit_catch_run_case_cleanup) without
marking the test as failed.  Instead, fill try_result with the error
code returned by kthread_run(), which will mark the test as failed and
print "internal error occurred...".

Cc: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
Cc: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Rae Moar <rmoar@xxxxxxxxxx>
Reviewed-by: David Gow <davidgow@xxxxxxxxxx>
Signed-off-by: Mickaël Salaün <mic@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240408074625.65017-2-mic@xxxxxxxxxxx

Changes since v2:
* Add Rae's and David's Reviewed-by.

Changes since v1:
* Add Kees's Reviewed-by.
 lib/kunit/try-catch.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/kunit/try-catch.c b/lib/kunit/try-catch.c
index f7825991d576..a5cb2ef70a25 100644
--- a/lib/kunit/try-catch.c
+++ b/lib/kunit/try-catch.c
@@ -69,6 +69,7 @@ void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
 	if (IS_ERR(task_struct)) {
+		try_catch->try_result = PTR_ERR(task_struct);

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