[next] i386: kunit: ASSERTION FAILED at mm/kfence/kfence_test.c:547

[Naresh Kamboju]

Following kernel regressions have been noticed on Linux next-20220426
(till date) on qemu_i386. This is a special build with KFENCE and KUNIT enabled
but not KASAN on i386.

snippet of Kconfigs from the build:
    CONFIG_CC_HAS_KASAN_GENERIC=y
    CONFIG_KFENCE=y
    CONFIG_KFENCE_KUNIT_TEST=y
    CONFIG_KUNIT=y
    CONFIG_KUNIT_DEBUGFS=y
    CONFIG_KUNIT_TEST=y
    CONFIG_KUNIT_EXAMPLE_TEST=y
    CONFIG_KUNIT_ALL_TESTS=y

Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>

Regressions found on qemu_i386;:

   - kunit/test_free_bulk
   - kunit/test_memcache_typesafe_by_rcu
   - kunit/test_out_of_bounds_read-memcache
   - kunit/test_invalid_access
   - kunit/test_krealloc
   - kunit/test_invalid_addr_free
   - kunit/test_gfpzero
   - kunit/test_kmalloc_aligned_oob_write
   - kunit/kfence
   - kunit/test_out_of_bounds_read
   - kunit/test_out_of_bounds_write
   - kunit/test_invalid_addr_free-memcache
   - kunit/test_double_free
   - kunit/test_corruption-memcache
   - kunit/test_use_after_free_read-memcache
   - kunit/test_corruption
   - kunit/test_use_after_free_read
   - kunit/test_shrink_memcache
   - kunit/test_double_free-memcache
   - kunit/test_out_of_bounds_write-memcache
   - kunit/test_kmalloc_aligned_oob_read


full test log link [1]

snippet of test log:
[    4.168302]     # test_free_bulk: test_alloc: size=271, gfp=cc0,
policy=right, cache=0
[    4.271599]     # test_free_bulk: test_alloc: size=271, gfp=cc0,
policy=none, cache=0
[    4.271611]     # test_free_bulk: test_alloc: size=271, gfp=cc0,
policy=left, cache=0
[    4.687568]     # test_free_bulk: test_alloc: size=271, gfp=cc0,
policy=none, cache=0
[    4.687581]     # test_free_bulk: test_alloc: size=271, gfp=cc0,
policy=none, cache=0
[    4.687616]     # test_free_bulk: ASSERTION FAILED at
mm/kfence/kfence_test.c:547
[    4.687616]     Expected report_available() to be false, but is true
[    4.687789]     not ok 13 - test_free_bulk
...
[   33.294007]     # test_memcache_typesafe_by_rcu: EXPECTATION FAILED
at mm/kfence/kfence_test.c:687
[   33.294007]     Expected report_matches(&expect) to be true, but is false
[   33.294182]     not ok 23 - test_memcache_typesafe_by_rcu
[   33.294183] kunit_try_catch (209) used greatest stack depth: 5840 bytes left
[   33.294619]     # test_krealloc: test_alloc: size=32, gfp=cc0,
policy=any, cache=0
[   33.391637]     # test_krealloc: ASSERTION FAILED at
mm/kfence/kfence_test.c:724
[   33.391637]     Expected report_available() to be false, but is true
[   33.391658]     not ok 24 - test_krealloc
[   33.391902]     # test_memcache_alloc_bulk: setup_test_cache:
size=32, ctor=0x0
[   33.495801]     ok 25 - test_memcache_alloc_bulk
[   33.495808] # kfence: pass:3 fail:20 skip:2 total:25
[   33.495817] # Totals: pass:3 fail:20 skip:2 total:25
[   33.495833] not ok 1 - kfence


metadata:
  git_ref: master
  git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
  git_sha: 088fb7eff3496e0f61fdf68bda89b81a4d0a4434
  git_describe: next-20220426
  kernel-config: https://builds.tuxbuild.com/28KafYBlDWOxI3qyNmGDwb63GuX/config

--
Linaro LKFT
https://lkft.linaro.org

[1] https://lkft.validation.linaro.org/scheduler/job/4950383#L770
[2] https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20220426/testrun/9235043/suite/kunit/test/test_use_after_free_read/log