On Wed, Mar 4, 2020 at 2:26 AM Patricia Alfonso <trishalfonso@xxxxxxxxxx> wrote: > > On Sat, Feb 29, 2020 at 10:29 PM Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > > > > On Sat, Feb 29, 2020 at 2:23 AM Patricia Alfonso > > <trishalfonso@xxxxxxxxxx> wrote: > > > > > > > > On Thu, Feb 27, 2020 at 3:44 AM 'Patricia Alfonso' via kasan-dev > > > > <kasan-dev@xxxxxxxxxxxxxxxx> wrote: > > > > > > > > > > --- a/tools/testing/kunit/kunit_kernel.py > > > > > +++ b/tools/testing/kunit/kunit_kernel.py > > > > > @@ -141,7 +141,7 @@ class LinuxSourceTree(object): > > > > > return True > > > > > > > > > > def run_kernel(self, args=[], timeout=None, build_dir=''): > > > > > - args.extend(['mem=256M']) > > > > > + args.extend(['mem=256M', 'kasan_multi_shot']) > > > > > > > > This is better done somewhere else (different default value if > > > > KASAN_TEST is enabled or something). Or overridden in the KASAN tests. > > > > Not everybody uses tools/testing/kunit/kunit_kernel.py and this seems > > > > to be a mandatory part now. This means people will always hit this, be > > > > confused, figure out they need to flip the value, and only then be > > > > able to run kunit+kasan. > > > > > > > I agree. Is the best way to do this with "bool multishot = > > > kasan_save_enable_multi_shot();" and > > > "kasan_restore_multi_shot(multishot);" inside test_kasan.c like what > > > was done in the tests before? > > > > This will fix KASAN tests, but not non-KASAN tests running under KUNIT > > and triggering KASAN reports. > > You set kasan_multi_shot for all KUNIT tests. I am reading this as > > that we don't want to abort on the first test that triggered a KASAN > > report. Or not? > > I don't think I understand the question, but let me try to explain my > thinking and see if that resonates with you. We know that the KASAN > tests will require more than one report, and we want that. For most > users, since a KASAN error can cause unexpected kernel behavior for > anything after a KASAN error, it is best for just one unexpected KASAN > error to be the only error printed to the user, unless they specify > kasan-multi-shot. The way I understand it, the way to implement this > is to use "bool multishot = kasan_save_enable_multi_shot();" and > "kasan_restore_multi_shot(multishot);" around the KASAN tests so that > kasan-multi-shot is temporarily enabled for the tests we expect > multiple reports. I assume "kasan_restore_multi_shot(multishot);" > restores the value to what the user input was so after the KASAN tests > are finished, if the user did not specify kasan-multi-shot and an > unexpected kasan error is reported, it will print the full report and > only that first one. Is this understanding correct? If you have a > better way of implementing this or a better expected behavior, I > appreciate your thoughts. Everything you say is correct. What I tried to point at is that this new behavior is different from the original behavior of your change. Initially you added kasan_multi_shot to command line for _all_ kunit tests (not just KASAN). The question is: do we want kasan_multi_shot for non-KASAN tests or not?
