================================================================== BUG: KCSAN: data-race in _find_next_bit / ext4_free_inode read-write to 0xffff88823ff22090 of 8 bytes by task 1852 on cpu 0: instrument_read_write include/linux/instrumented.h:57 [inline] __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:81 [inline] __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:109 [inline] __test_and_clear_bit_le include/asm-generic/bitops/le.h:125 [inline] ext4_free_inode+0x5bf/0xa30 fs/ext4/ialloc.c:316 ext4_evict_inode+0xbff/0xf10 fs/ext4/inode.c:332 evict+0x1aa/0x410 fs/inode.c:590 iput_final fs/inode.c:1670 [inline] iput+0x3ef/0x580 fs/inode.c:1696 do_unlinkat+0x2d4/0x540 fs/namei.c:4174 __do_sys_unlink fs/namei.c:4215 [inline] __se_sys_unlink fs/namei.c:4213 [inline] __x64_sys_unlink+0x2c/0x30 fs/namei.c:4213 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88823ff22090 of 8 bytes by task 2796 on cpu 1: _find_next_bit+0xe0/0x190 lib/find_bit.c:60 find_next_zero_bit include/asm-generic/bitops/find.h:94 [inline] find_next_zero_bit_le include/asm-generic/bitops/le.h:17 [inline] find_inode_bit+0xc8/0x330 fs/ext4/ialloc.c:725 __ext4_new_inode+0xc9a/0x2fc0 fs/ext4/ialloc.c:1066 ext4_mkdir+0x28a/0x760 fs/ext4/namei.c:2929 vfs_mkdir+0x2c8/0x3d0 fs/namei.c:3883 do_mkdirat+0x12e/0x2c0 fs/namei.c:3909 __do_sys_mkdir fs/namei.c:3929 [inline] __se_sys_mkdir fs/namei.c:3927 [inline] __x64_sys_mkdir+0x40/0x50 fs/namei.c:3927 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0xffffffffffffffff -> 0xffffffffff9fffff Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2796 Comm: syz-executor.4 Tainted: G W 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================