Following kernel BUG KFENCE noticed on qemu_arm while testing lib: bitmap.sh with kselftest merge config build image [1] & [2].

metadata: git_ref: master git_repo: https://gitlab.com/Linaro/lkft/mirrors/torvalds/linux-mainline git_sha: 672c0c5173427e6b3e2a9bbb7be51ceeec78093a git_describe: v5.18-rc5 kernel_version: 5.18.0-rc5 kernel-config: https://builds.tuxbuild.com/28a2wdk3XzmLVGqD5njLS4uX1tm/config artifact-location: https://builds.tuxbuild.com/28a2wdk3XzmLVGqD5njLS4uX1tm toolchain: gcc-10

Test log: --------- # selftests: lib: bitmap.sh [ 36.266913] test_bitmap: loaded. [ 36.269151] test_bitmap: parselist: 14: input is '0-2047:128/256' OK, Time: 4600 [ 36.273024] ================================================================== [ 36.275942] BUG: KFENCE: out-of-bounds read in _find_next_bit_le+0x10/0x48 [ 36.275942] [ 36.279808] Out-of-bounds read at 0x9ec8e937 (4096B right of kfence-#29): [ 36.283046] _find_next_bit_le+0x10/0x48 [ 36.285030] [ 36.285816] kfence-#29: 0xf28dd28d-0x0b305c8e, size=4096, cache=kmalloc-4k [ 36.285816] [ 36.289807] allocated by task 498 on cpu 1 at 36.272960s: [ 36.292432] test_bitmap_printlist+0x2c/0x13c [test_bitmap] [ 36.295174] test_bitmap_init+0x5c/0xefc [test_bitmap] [ 36.297709] do_one_initcall+0x70/0x330 [ 36.299605] do_init_module+0x4c/0x26c [ 36.301484] sys_finit_module+0xdc/0x138 [ 36.303452] ret_fast_syscall+0x0/0x1c [ 36.305294] 0xbebec788 [ 36.306516] [ 36.307264] CPU: 1 PID: 498 Comm: modprobe Not tainted 5.18.0-rc5 #1 [ 36.310304] Hardware name: Generic DT based system [ 36.312658] ================================================================== [ 36.316609] test_bitmap: bitmap_print_to_pagebuf: input is '0-32767 [ 36.316609] ', Time: 43635540 [ 36.333605] test_bitmap: all 1945 tests passed [ 36.360116] test_bitmap: unloaded. # bitmap: ok

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

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

[1] https://lkft.validation.linaro.org/scheduler/job/4975877#L995 [2] https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v5.18-rc5/tes...