================================================================== BUG: KCSAN: data-race in __ext4_new_inode / _find_next_bit.constprop.0 write to 0xffff8881240483b8 of 8 bytes by task 8920 on cpu 0: 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+0xf4d/0x3020 fs/ext4/ialloc.c:957 ext4_mkdir+0x271/0x850 fs/ext4/namei.c:2790 vfs_mkdir+0x281/0x3b0 fs/namei.c:3625 do_mkdirat+0x1b5/0x200 fs/namei.c:3648 __do_sys_mkdir fs/namei.c:3664 [inline] __se_sys_mkdir fs/namei.c:3662 [inline] __x64_sys_mkdir+0x3d/0x50 fs/namei.c:3662 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881240483b8 of 8 bytes by task 9086 on cpu 1: _find_next_bit.constprop.0+0x61/0x160 lib/find_bit.c:39 find_next_zero_bit+0x35/0x50 lib/find_bit.c:87 find_next_zero_bit_le include/asm-generic/bitops/le.h:15 [inline] find_inode_bit.isra.0+0xa1/0x330 fs/ext4/ialloc.c:718 __ext4_new_inode+0xd7b/0x3020 fs/ext4/ialloc.c:927 ext4_mkdir+0x271/0x850 fs/ext4/namei.c:2790 vfs_mkdir+0x281/0x3b0 fs/namei.c:3625 do_mkdirat+0x1b5/0x200 fs/namei.c:3648 __do_sys_mkdir fs/namei.c:3664 [inline] __se_sys_mkdir fs/namei.c:3662 [inline] __x64_sys_mkdir+0x3d/0x50 fs/namei.c:3662 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 9086 Comm: syz-executor.2 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================