While running kunit tests on arm64 and x86_64 the following kernel BUG noticed on running Linux next-20240508 kernel and stride tests failed.

observations: 1) The null pointer dereference notice while running kunit_test 2) The stride test case failed on today's linux next-20240508 tag.

The detailed log provided in the links below.

Reported-by: Linux Kernel Functional Testing lkft@linaro.org

Crash log: --------

<6>[ 43.086497] KTAP version 1 <6>[ 43.087004] # Subtest: kunit_fault <6>[ 43.087577] # module: kunit_test <6>[ 43.087748] 1..1 <1>[ 43.092588] Unable to handle kernel paging request at virtual address dfff800000000000 <1>[ 43.093687] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] <1>[ 43.094770] Mem abort info: <1>[ 43.095425] ESR = 0x0000000096000005 <1>[ 43.097071] EC = 0x25: DABT (current EL), IL = 32 bits <1>[ 43.098034] SET = 0, FnV = 0 <1>[ 43.098542] EA = 0, S1PTW = 0 <1>[ 43.099104] FSC = 0x05: level 1 translation fault <1>[ 43.099837] Data abort info: <1>[ 43.100679] ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 <1>[ 43.101535] CM = 0, WnR = 0, TnD = 0, TagAccess = 0 <1>[ 43.102321] GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 <1>[ 43.103287] [dfff800000000000] address between user and kernel address ranges <0>[ 43.105111] Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP <4>[ 43.106046] Modules linked in: <4>[ 43.108961] CPU: 1 PID: 375 Comm: kunit_try_catch Tainted: G N 6.9.0-rc7-next-20240508 #1 <4>[ 43.110433] Hardware name: linux,dummy-virt (DT) <4>[ 43.111555] pstate: 82400009 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) <4>[ 43.113232] pc : kunit_test_null_dereference+0x2c/0x114 <4>[ 43.114785] lr : kunit_generic_run_threadfn_adapter+0x84/0x104 <4>[ 43.115692] sp : ffff800080ff7dd0 <4>[ 43.116646] x29: ffff800080ff7de0 x28: 0000000000000000 x27: 1ffe000018f1db69 <4>[ 43.117953] x26: dfff800000000000 x25: ffff943388e90ab8 x24: 0000000000000001 <4>[ 43.119037] x23: 1ffe000018a7a771 x22: dfff800000000000 x21: dfff800000000000 <4>[ 43.120659] x20: ffff943388e9d5a0 x19: fff00000c53d3b88 x18: ffff800080097930 <4>[ 43.121669] x17: ffff943388e905e4 x16: ffff94338837d7e4 x15: 0000000000000001 <4>[ 43.122762] x14: 1ffe000018f1dc59 x13: 0000000000000000 x12: 0000000000000000 <4>[ 43.123881] x11: fffd800018f1dc5a x10: dfff800000000000 x9 : 1ffe000018a7a772 <4>[ 43.125204] x8 : 7c0c8af2c07cc400 x7 : 0000000000000000 x6 : 72745f74696e756b <4>[ 43.126291] x5 : fff00000c53d45d6 x4 : 0000000000000000 x3 : ffff94338acf91b4 <4>[ 43.127380] x2 : 0000000000000001 x1 : 0000000000000001 x0 : ffff800080087af8 <4>[ 43.129375] Call trace: <4>[ 43.129852] kunit_test_null_dereference+0x2c/0x114 <4>[ 43.130621] kunit_generic_run_threadfn_adapter+0x84/0x104 <4>[ 43.131480] kthread+0x268/0x3a4 <4>[ 43.132390] ret_from_fork+0x10/0x20 <0>[ 43.133497] Code: d2d00015 f9426508 f2fbfff5 f90007e8 (39c002a8) <4>[ 43.134637] ---[ end trace 0000000000000000 ]--- <3>[ 43.136227] # kunit_test_fault_null_dereference: try faulted: last line seen lib/kunit/kunit-test.c:95

<trim>

<6>[ 98.315793] KTAP version 1 <6>[ 98.317173] # Subtest: stride <4>[ 98.320844] regmap_test stride.regmap_test: No cache used with register defaults set! <3>[ 98.323706] ================================================================== <3>[ 98.325683] BUG: KASAN: slab-out-of-bounds in stride+0x698/0x8a8 <3>[ 98.326518] Write of size 1 at addr fff00000c7b3320b by task kunit_try_catch/1143 <3>[ 98.328402] <3>[ 98.329468] CPU: 0 PID: 1143 Comm: kunit_try_catch Tainted: G D N 6.9.0-rc7-next-20240508 #1 <3>[ 98.330560] Hardware name: linux,dummy-virt (DT) <3>[ 98.331400] Call trace: <3>[ 98.332216] dump_backtrace+0xf0/0x128 <3>[ 98.332815] show_stack+0x18/0x24 <3>[ 98.333475] dump_stack_lvl+0x40/0x84 <3>[ 98.334187] print_report+0x16c/0x728 <3>[ 98.334887] kasan_report+0xd8/0x134 <3>[ 98.335589] __asan_report_store1_noabort+0x20/0x2c <3>[ 98.337089] stride+0x698/0x8a8 <3>[ 98.337739] kunit_try_run_case+0x118/0x31c <3>[ 98.338574] kunit_generic_run_threadfn_adapter+0x84/0x104 <3>[ 98.339529] kthread+0x268/0x3a4 <3>[ 98.340427] ret_from_fork+0x10/0x20 <3>[ 98.341331] <3>[ 98.341826] Allocated by task 1143: <4>[ 98.342644] kasan_save_track+0x40/0x78 <4>[ 98.343269] kasan_save_alloc_info+0x44/0x54 <4>[ 98.344067] __kasan_kmalloc+0x84/0x9c <4>[ 98.345005] __kmalloc_noprof+0x208/0x3a4 <4>[ 98.346322] __regmap_init_ram+0x70/0x158 <4>[ 98.347113] gen_regmap+0x3a4/0x554 <4>[ 98.347878] stride+0x78/0x8a8 <4>[ 98.348639] kunit_try_run_case+0x118/0x31c <4>[ 98.349326] kunit_generic_run_threadfn_adapter+0x84/0x104 <4>[ 98.350315] kthread+0x268/0x3a4 <4>[ 98.350983] ret_from_fork+0x10/0x20 <3>[ 98.351734] <3>[ 98.352257] The buggy address belongs to the object at fff00000c7b33200 <3>[ 98.352257] which belongs to the cache kmalloc-16 of size 16 <3>[ 98.354108] The buggy address is located 0 bytes to the right of <3>[ 98.354108] allocated 11-byte region [fff00000c7b33200, fff00000c7b3320b) <3>[ 98.355956] <3>[ 98.356752] The buggy address belongs to the physical page: <4>[ 98.357945] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107b33 <4>[ 98.359143] flags: 0xbfffe0000000000(node=0|zone=2|lastcpupid=0x1ffff) <4>[ 98.360819] page_type: 0xffffefff(slab) <4>[ 98.362282] raw: 0bfffe0000000000 fff00000c0001640 dead000000000122 0000000000000000 <4>[ 98.363246] raw: 0000000000000000 0000000080800080 00000001ffffefff 0000000000000000 <4>[ 98.364762] page dumped because: kasan: bad access detected <3>[ 98.365543] <3>[ 98.365944] Memory state around the buggy address: <3>[ 98.367010] fff00000c7b33100: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc <3>[ 98.368304] fff00000c7b33180: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc <3>[ 98.369228] >fff00000c7b33200: 00 03 fc fc 00 03 fc fc fc fc fc fc fc fc fc fc <3>[ 98.370208] ^ <3>[ 98.370915] fff00000c7b33280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc <3>[ 98.372179] fff00000c7b33300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc <3>[ 98.373119] ================================================================== <6>[ 98.379784] not ok 1 none-default @0x0 <6>[ 98.387715] ok 2 flat-default @0x0 <6>[ 98.396608] ok 3 rbtree-default @0x0 <6>[ 98.403430] ok 4 maple-default @0x0 <6>[ 98.405635] # stride: pass:3 fail:1 skip:0 total:4 <6>[ 98.406235] not ok 11 stride

Links: ---- - https://storage.tuxsuite.com/public/linaro/lkft/builds/2gB3M3nlA8sWzr9GBuN7r... - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240508/tes... - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240508/tes... - https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/2gB3N9JXfJ1...

metadata: -- arch: arm64 environment: qemu-arm64 git_describe: next-20240508 git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next

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