The SLUB changes for 6.12 included new kunit tests that resulted in noisy warnings, which we normally suppress, and a boot lockup in some configurations in case the kunit tests are built-in.
The warnings are addressed in Patch 1.
The lockups I couldn't reproduce, but inspecting boot initialization order makes me suspect the test_kfree_rcu() calling kfree_rcu() which is too early before RCU finishes initialization. Moving the exection later was tried but broke tests marking their code as __init so Patch 2 skips the test when the slub kunit tests are built-in.
So these are now fixes for 4e1c44b3db79 ("kunit, slub: add test_kfree_rcu() and test_leak_destroy()")
The plan is to take the fixes via slab tree for a 6.12 rcX.
Signed-off-by: Vlastimil Babka vbabka@suse.cz --- Changes in v2: - patch 2 skips the test when built-in instead of moving kunit execution later - Link to v1: https://lore.kernel.org/r/20240930-b4-slub-kunit-fix-v1-0-32ca9dbbbc11@suse....
--- Vlastimil Babka (2): mm, slab: suppress warnings in test_leak_destroy kunit test slub/kunit: skip test_kfree_rcu when the slub kunit test is built-in
lib/slub_kunit.c | 18 ++++++++++++------ mm/slab.h | 6 ++++++ mm/slab_common.c | 5 +++-- mm/slub.c | 5 +++-- 4 files changed, 24 insertions(+), 10 deletions(-) --- base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc change-id: 20240930-b4-slub-kunit-fix-6fba4d1c1742
Best regards,