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On Tue, Jan 13, 2026 at 04:42:05PM -0500, eugene.loh@oracle.com wrote: >>>> From: Eugene Loh >>>> >>>> [...] >>>> >>>> Add a test to check that a rawfbt probe can be found behind an fbt probe >>>> when the probe description has a wildcard provider. >>>> >>>> Orabug: 38842114 >>>> Signed-off-by: Eugene Loh >>>> >>>> diff --git a/test/unittest/providers/rawfbt/tst.wildcard-provider.d b/test/unittest/providers/rawfbt/tst.wildcard-provider.d >>>> new file mode 100644 >>>> @@ -0,0 +1,20 @@ >>>> +/* >>>> + * ASSERTION: rawfbt probes can be found even when a wildcard provider >>>> + * description also allows fbt probes. >>>> + */ >>>> + >>>> +#pragma D option quiet >>>> + >>>> +BEGIN, >>>> +*fbt:vmlinux:do_sys_open*:entry >>>> +{ >>>> + printf("success\n"); >>>> + exit(0); >>>> +} >>> I am confused how this test accomplishes verification of the assertion. If >>> a regular FBT probe satisfies the probe description, wouldn't this pass also? >>> Wouldn't a -l based test be better here, where you can test that the output >>> does indeed report both the fbt probe and the rawfbt probe that match? >> It appears that -l is not an issue;  a -l test does not show the problem. >> The test in the patch is derived from the user bug report that motivated >> this patch. >> >> The whole prvname problem is that the bad prvname value makes GROUP_DATA >> bad, which makes FBT_GROUP_DATA bad, which is an issue only in kprobe_attach >> (and detach).  So, we need kprobe_attach() to see the problem. > Ok, so yes, -l is not sufficient. But still, even if the test is derived from > the original reported problem, it still looks wrong to me. Or rather, the test > can pass when > > fbt:vmlinux:do_sys+open*:entry exists > rawfbt:vmlinux:do_sys+open*:entry does NOT exist > > because as long as 1 probe matches the probe specification, compilation will > succeed (and at runtime, the probe firing will complete the success criterium). > > But that is not a valid PASS result for the assertion that is posed for this > test. If you are specifically looking for a rawfbt probe using a wildcard, you > might want to use r*fbt:vmlinux:do_sys+open*:entry instead perhaps? This test is admittedly not the most stringent;  it could well pass even if some other bugs lurk somewhere.  The test simply reports a problem with the old bits and then passes with the fix.  It is a confirmation -- however weak -- that the fix is doing something right. Meanwhile, I do not understand your concerns with regards to the assertion.  Specifically, using r*fbt would preclude any fbt probes;  so there would be nothing for the rawfbt probe to "hide behind."  And, fwiw, using r*fbt makes the test pass even without the fix.