bisecting fixing commit since 3dbdb38e286903ec220aaf1fb29a8d94297da246 building syzkaller on 55aa55c24fe77aae07d530662f91b4d50c4990f0 testing commit 3dbdb38e286903ec220aaf1fb29a8d94297da246 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: d9a681ae9c878edec72a09fad4fefe5f349a807f2bbc80f88821aa0c03632039 run #0: basic kernel testing failed: BUG: sleeping function called from invalid context in stack_depot_save run #1: crashed: unexpected kernel reboot run #2: crashed: BUG: Bad rss-counter state run #3: crashed: BUG: Bad rss-counter state run #4: crashed: BUG: Bad rss-counter state run #5: crashed: BUG: Bad rss-counter state run #6: crashed: BUG: Bad rss-counter state run #7: crashed: BUG: Bad rss-counter state run #8: crashed: BUG: Bad rss-counter state run #9: crashed: unexpected kernel reboot run #10: crashed: kernel BUG in ___pmd_free_tlb run #11: crashed: BUG: unable to handle kernel NULL pointer dereference in corrupted run #12: crashed: unexpected kernel reboot run #13: crashed: BUG: Bad rss-counter state run #14: crashed: BUG: Bad rss-counter state run #15: crashed: BUG: Bad rss-counter state run #16: crashed: BUG: Bad rss-counter state run #17: crashed: BUG: Bad rss-counter state run #18: crashed: BUG: Bad rss-counter state run #19: crashed: BUG: Bad rss-counter state testing current HEAD 20621d2f27a0163b81dc2b74fd4c0b3e6aa5fa12 testing commit 20621d2f27a0163b81dc2b74fd4c0b3e6aa5fa12 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 13fead43970f3b27b55c8016950d1a53769ce29a8536b3654aa1aa3c266abf41 all runs: OK # git bisect start 20621d2f27a0163b81dc2b74fd4c0b3e6aa5fa12 3dbdb38e286903ec220aaf1fb29a8d94297da246 Bisecting: 9868 revisions left to test after this (roughly 13 steps) [49f9df5ba298a4b6754281e40ea80878a4d49c44] Merge branch 'bnxt_en-fw-messages' testing commit 49f9df5ba298a4b6754281e40ea80878a4d49c44 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: a88d565526fa99a0b4d3a34e47aed605920f5ef16e73514b22a65d13599fa30e all runs: OK # git bisect bad 49f9df5ba298a4b6754281e40ea80878a4d49c44 Bisecting: 4931 revisions left to test after this (roughly 12 steps) [dcf3c935dd9e8e76c9922e88672fa4ad6a8a4df8] Merge tag 'for-linus-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml testing commit dcf3c935dd9e8e76c9922e88672fa4ad6a8a4df8 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 6e00132f207a8e3fce5b0cc7c434a26936450fdfeaea1d3b09d8a5a4bba6a8bf run #0: boot failed: BUG: sleeping function called from invalid context in stack_depot_save run #1: boot failed: possible deadlock in get_page_from_freelist run #2: boot failed: BUG: sleeping function called from invalid context in stack_depot_save run #3: boot failed: BUG: sleeping function called from invalid context in stack_depot_save run #4: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM) run #5: boot failed: possible deadlock in fs_reclaim_acquire run #6: boot failed: kernel panic: VFS: Unable to mount root fs on unknown-block(NUM,NUM) run #7: boot failed: BUG: sleeping function called from invalid context in stack_depot_save run #8: boot failed: BUG: sleeping function called from invalid context in stack_depot_save run #9: boot failed: possible deadlock in get_page_from_freelist # git bisect skip dcf3c935dd9e8e76c9922e88672fa4ad6a8a4df8 Bisecting: 4931 revisions left to test after this (roughly 12 steps) [8ba6e8640844213e27c22f5eae915710f7b7998d] userfaultfd/selftests: reinitialize test context in each test testing commit 8ba6e8640844213e27c22f5eae915710f7b7998d compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: c61d9bf16242d65269a09725783a296bd23a5fe1c7aea2b511a2dce8c1361c94 all runs: OK # git bisect bad 8ba6e8640844213e27c22f5eae915710f7b7998d Bisecting: 22 revisions left to test after this (roughly 5 steps) [3bc2b6a725963bb1b441356873da890e397c1a3f] mm: sparsemem: split the huge PMD mapping of vmemmap pages testing commit 3bc2b6a725963bb1b441356873da890e397c1a3f compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: b3de6b8d97d1ea95a5b1f33c24389872f413e4f0748c0c71300d2a14db830f46 run #0: basic kernel testing failed: possible deadlock in fs_reclaim_acquire run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 3bc2b6a725963bb1b441356873da890e397c1a3f Bisecting: 11 revisions left to test after this (roughly 4 steps) [b2bd53f18bb7f7cfc91b3bb527d7809376700a8e] mm/huge_memory.c: remove dedicated macro HPAGE_CACHE_INDEX_MASK testing commit b2bd53f18bb7f7cfc91b3bb527d7809376700a8e compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 7a88762fc7bf121bcd173c2ec17d0c29ef2d11e0cfac058e99fa7ea80495eb9d run #0: crashed: BUG: sleeping function called from invalid context in stack_depot_save run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK reproducer seems to be flaky # git bisect good b2bd53f18bb7f7cfc91b3bb527d7809376700a8e Bisecting: 5 revisions left to test after this (roughly 3 steps) [c742199a014de23ee92055c2473d91fe5561ffdf] mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge testing commit c742199a014de23ee92055c2473d91fe5561ffdf compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: eb6bc4e63233f7ba8e48a0a1d5f0aa18a862917854a581a07303d51b02868a07 run #0: crashed: possible deadlock in fs_reclaim_acquire run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK run #10: OK run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK # git bisect good c742199a014de23ee92055c2473d91fe5561ffdf Bisecting: 2 revisions left to test after this (roughly 2 steps) [a6a8f7c4aa7eb50304b5c4e68eccd24313f3a785] powerpc/8xx: add support for huge pages on VMAP and VMALLOC testing commit a6a8f7c4aa7eb50304b5c4e68eccd24313f3a785 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: f7ad49ceaec8987c5d357816fef0aafb0226eac3ef0e225e3dfd9bea3f0bae20 run #0: basic kernel testing failed: BUG: sleeping function called from invalid context in stack_depot_save run #1: crashed: BUG: sleeping function called from invalid context in lock_sock_nested run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK run #10: OK run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK # git bisect good a6a8f7c4aa7eb50304b5c4e68eccd24313f3a785 Bisecting: 1 revision left to test after this (roughly 1 step) [22f3c951865be13dd32ba042b50bea3f6f93e115] khugepaged: selftests: remove debug_cow testing commit 22f3c951865be13dd32ba042b50bea3f6f93e115 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: f7ad49ceaec8987c5d357816fef0aafb0226eac3ef0e225e3dfd9bea3f0bae20 run #0: basic kernel testing failed: possible deadlock in fs_reclaim_acquire run #1: basic kernel testing failed: possible deadlock in fs_reclaim_acquire run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK run #10: OK run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK # git bisect bad 22f3c951865be13dd32ba042b50bea3f6f93e115 22f3c951865be13dd32ba042b50bea3f6f93e115 is the first bad commit commit 22f3c951865be13dd32ba042b50bea3f6f93e115 Author: Nanyong Sun Date: Wed Jun 30 18:48:16 2021 -0700 khugepaged: selftests: remove debug_cow The debug_cow attribute had been removed since commit 4958e4d86ecb01 ("mm: thp: remove debug_cow switch"), so remove it in selftest code too, otherwise the khugepaged test will fail. Link: https://lkml.kernel.org/r/20210430051117.400189-1-sunnanyong@huawei.com Fixes: 4958e4d86ecb01 ("mm: thp: remove debug_cow switch") Signed-off-by: Nanyong Sun Cc: Yang Shi Cc: Zi Yan Cc: Kirill A. Shutemov Cc: Shuah Khan Cc: Kefeng Wang Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds tools/testing/selftests/vm/khugepaged.c | 4 ---- 1 file changed, 4 deletions(-) culprit signature: f7ad49ceaec8987c5d357816fef0aafb0226eac3ef0e225e3dfd9bea3f0bae20 parent signature: f7ad49ceaec8987c5d357816fef0aafb0226eac3ef0e225e3dfd9bea3f0bae20 Reproducer flagged being flaky revisions tested: 10, total time: 2h52m39.010366947s (build: 1h5m0.018686891s, test: 1h46m4.421910212s) first good commit: 22f3c951865be13dd32ba042b50bea3f6f93e115 khugepaged: selftests: remove debug_cow recipients (to): ["akpm@linux-foundation.org" "sunnanyong@huawei.com" "torvalds@linux-foundation.org"] recipients (cc): []