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awl=host:13839 X-Proofpoint-GUID: gYPy2dOWdP4778PcLMFWsRD7IHLoHxK_ Ankur Arora writes: > Mark Brown writes: > >> On Mon, May 18, 2026 at 01:00:07PM +0100, Mark Brown wrote: >> >>> After merging the mm-nonmm-unstable tree, today's linux-next testing >>> (arm64 kunit) failed like this: >> >>> [11:39:24] Failures: smp-cond-load-relaxed-timeout.smp_cond_relaxed_timeout_succeeds >> >>> Note that we are running on an arm64 host with access to KVM so the >>> above should be running with KVM rather than being emulated. >> >>> Caused by commit >> >>> 0403c34571d1d (kunit: add tests for smp_cond_load_relaxed_timeout()) >> >>> in that it's adding the new test which fails, I didn't investigate the >>> quality of the test. I do note that there's some related functional >>> work also from Ankur that's also added by the mm-nonmm-unstable tree but >>> didn't investigate that either. >> >>> I have used the version from next-20260506 instead, the code was in >>> next-20260508 but I belive Thierry was emulating. >> >> Actually these patches were introduced in next-20260427 so I'll need to >> go back to next-20260424 instead, sorry (got confused by the tree >> rebasing). It looks like something in the more recent versions made the >> issue more promienent. > > Hi Mark > > Thanks for the report. The failing test case is using a kthread to > toggle a bit which the test depends on. > > The first test condition succeeds: > > KUNIT_EXPECT_EQ(test, (bool)(result & TEST_FLAG_VAL), succeeds) > > so the bit did get toggled. The second condition (runtime <= timeout_ns) > failed: > > KUNIT_EXPECT_EQ(test, runtime <= timeout_ns, succeeds) > > Possibly because the we got scheduled out while running the test. Not > sure why the test started failing now. I'm guessing the VM running the > test isn't under CPU stress and the like. > > If that can happen then I should relax the second condition. Thinking some more, the condition is much too strict. Instead of: succeeds => (runtime <= timeout_ns) A better check would be: !succeeds => runtime >= timeout_ns I'll send a patch to that effect. Thanks -- ankur