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kunit: Fix race condition in try-catch completion

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KUnit's try-catch infrastructure now uses vfork_done, which is always
set to a valid completion when a kthread is created, but which is set to
NULL once the thread terminates. This creates a race condition, where
the kthread exits before we can wait on it.

Keep a copy of vfork_done, which is taken before we wake_up_process()
and so valid, and wait on that instead.

Fixes: 93533996100c ("kunit: Handle test faults")
Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Closes: https://lore.kernel.org/lkml/20240410102710.35911-1-naresh.kamboju@linaro.org/
Tested-by: Linux Kernel Functional Testing <lkft@linaro.org>
Acked-by: Mickaël Salaün <mic@digikod.net>
Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Rae Moar <rmoar@google.com>
Tested-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
David Gow 2024-04-12 10:59:01 +08:00 • committed by Shuah Khan
parent 170c31737c
commit 1eb69ded80
1 changed files with 7 additions and 3 deletions
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10
lib/kunit/try-catch.c
View file

@ -63,6 +63,7 @@ void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
{
struct kunit *test = try_catch->test;
struct task_struct *task_struct;
struct completion *task_done;
int exit_code, time_remaining;
try_catch->context = context;
@ -75,13 +76,16 @@ void kunit_try_catch_run(struct kunit_try_catch *try_catch, void *context)
return;
}
get_task_struct(task_struct);
wake_up_process(task_struct);
/*
* As for a vfork(2), task_struct->vfork_done (pointing to the
* underlying kthread->exited) can be used to wait for the end of a
* kernel thread.
* kernel thread. It is set to NULL when the thread exits, so we
* keep a copy here.
*/
time_remaining = wait_for_completion_timeout(task_struct->vfork_done,
task_done = task_struct->vfork_done;
wake_up_process(task_struct);
time_remaining = wait_for_completion_timeout(task_done,
kunit_test_timeout());
if (time_remaining == 0) {
try_catch->try_result = -ETIMEDOUT;