================================================================== BUG: KCSAN: data-race in __ext4_new_inode / find_next_zero_bit read to 0xffff88811f727010 of 8 bytes by task 7218 on cpu 1: _find_next_bit lib/find_bit.c:53 [inline] find_next_zero_bit+0x9b/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:715 __ext4_new_inode+0xd4b/0x3070 fs/ext4/ialloc.c:914 ext4_mkdir+0x289/0x820 fs/ext4/namei.c:2763 vfs_mkdir+0x283/0x390 fs/namei.c:3807 do_mkdirat+0x1ac/0x1f0 fs/namei.c:3830 __do_sys_mkdir fs/namei.c:3846 [inline] __se_sys_mkdir fs/namei.c:3844 [inline] __x64_sys_mkdir+0x40/0x50 fs/namei.c:3844 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff88811f727010 of 8 bytes by task 11039 on cpu 0: __test_and_set_bit include/asm-generic/bitops-instrumented.h:168 [inline] __test_and_set_bit_le include/asm-generic/bitops/le.h:90 [inline] __ext4_new_inode+0x206b/0x3070 fs/ext4/ialloc.c:944 ext4_symlink+0x30e/0x970 fs/ext4/namei.c:3262 vfs_symlink fs/namei.c:4119 [inline] vfs_symlink+0x218/0x310 fs/namei.c:4105 do_symlinkat+0x1a5/0x1e0 fs/namei.c:4146 __do_sys_symlink fs/namei.c:4165 [inline] __se_sys_symlink fs/namei.c:4163 [inline] __x64_sys_symlink+0x3f/0x50 fs/namei.c:4163 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 11039 Comm: syz-executor.0 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================