================================================================== BUG: KCSAN: data-race in ext4_free_inode / find_next_zero_bit write to 0xffff888122e71010 of 8 bytes by task 8016 on cpu 0: __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:91 [inline] __test_and_clear_bit_le include/asm-generic/bitops/le.h:95 [inline] ext4_free_inode+0x5e5/0xa50 fs/ext4/ialloc.c:308 ext4_evict_inode+0x87f/0xe50 fs/ext4/inode.c:316 evict+0x244/0x410 fs/inode.c:574 iput_final fs/inode.c:1563 [inline] iput+0x371/0x4e0 fs/inode.c:1589 do_unlinkat+0x378/0x530 fs/namei.c:4073 __do_sys_unlink fs/namei.c:4114 [inline] __se_sys_unlink fs/namei.c:4112 [inline] __x64_sys_unlink+0x3b/0x50 fs/namei.c:4112 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888122e71010 of 8 bytes by task 11610 on cpu 1: _find_next_bit lib/find_bit.c:39 [inline] find_next_zero_bit+0x4e/0xe0 lib/find_bit.c:79 find_next_zero_bit_le include/asm-generic/bitops/le.h:15 [inline] find_inode_bit.isra.0+0x82/0x300 fs/ext4/ialloc.c:710 __ext4_new_inode+0xd45/0x2f10 fs/ext4/ialloc.c:909 ext4_mkdir+0x270/0x820 fs/ext4/namei.c:2774 vfs_mkdir+0x283/0x390 fs/namei.c:3819 do_mkdirat+0x1ac/0x1f0 fs/namei.c:3842 __do_sys_mkdir fs/namei.c:3858 [inline] __se_sys_mkdir fs/namei.c:3856 [inline] __x64_sys_mkdir+0x40/0x50 fs/namei.c:3856 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 11610 Comm: syz-executor.3 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================