================================================================== BUG: KCSAN: data-race in __ext4_new_inode / find_next_zero_bit write to 0xffff888123867010 of 8 bytes by task 7923 on cpu 1: instrument_write include/linux/instrumented.h:42 [inline] __test_and_set_bit include/asm-generic/bitops/instrumented-non-atomic.h:71 [inline] __test_and_set_bit_le include/asm-generic/bitops/le.h:90 [inline] __ext4_new_inode+0xf39/0x2f10 fs/ext4/ialloc.c:939 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 read to 0xffff888123867010 of 8 bytes by task 28974 on cpu 0: _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_symlink+0x31c/0x9b0 fs/ext4/namei.c:3275 vfs_symlink fs/namei.c:4131 [inline] vfs_symlink+0x218/0x310 fs/namei.c:4117 do_symlinkat+0x1a5/0x1e0 fs/namei.c:4158 __do_sys_symlink fs/namei.c:4177 [inline] __se_sys_symlink fs/namei.c:4175 [inline] __x64_sys_symlink+0x3f/0x50 fs/namei.c:4175 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: 0 PID: 28974 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================