================================================================== BUG: KCSAN: data-race in ext4_es_lookup_extent+0x1fa/0x510 fs/ext4/extents_status.c:952 and ext4_es_lookup_extent+0x20d/0x510 read to 0xffff888218501c30 of 8 bytes by task 7981 on cpu 0: ext4_es_lookup_extent+0x1fa/0x510 fs/ext4/extents_status.c:952 ext4_map_blocks+0xc2/0xf70 fs/ext4/inode.c:530 _ext4_get_block+0x12d/0x2b0 fs/ext4/inode.c:791 ext4_get_block_trans+0xf4/0x1d0 fs/ext4/inode.c:852 ext4_dio_get_block+0x6f/0xb0 fs/ext4/inode.c:869 get_more_blocks fs/direct-io.c:710 [inline] do_direct_IO+0x1409/0x59b0 fs/direct-io.c:995 do_blockdev_direct_IO+0x6b7/0x4cc0 fs/direct-io.c:1327 __blockdev_direct_IO+0x86/0xa0 fs/direct-io.c:1413 ext4_direct_IO_write fs/ext4/inode.c:3788 [inline] ext4_direct_IO+0x6f5/0xf70 fs/ext4/inode.c:3915 generic_file_direct_write+0x14d/0x2e0 mm/filemap.c:3230 __generic_file_write_iter+0x17e/0x380 mm/filemap.c:3413 ext4_file_write_iter+0x1fc/0xa40 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1870 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 write to 0xffff888218501c30 of 8 bytes by task 7759 on cpu 1: ext4_es_lookup_extent+0x20d/0x510 fs/ext4/extents_status.c:952 ext4_map_blocks+0xc2/0xf70 fs/ext4/inode.c:530 ext4_getblk+0x82/0x380 fs/ext4/inode.c:974 ext4_bread+0x4a/0x190 fs/ext4/inode.c:1024 ext4_append+0xc8/0x1f0 fs/ext4/namei.c:67 ext4_init_new_dir fs/ext4/namei.c:2728 [inline] ext4_mkdir+0x421/0x820 fs/ext4/namei.c:2773 vfs_mkdir+0x283/0x390 fs/namei.c:3815 do_mkdirat+0x1ac/0x1f0 fs/namei.c:3838 __do_sys_mkdir fs/namei.c:3854 [inline] __se_sys_mkdir fs/namei.c:3852 [inline] __x64_sys_mkdir+0x40/0x50 fs/namei.c:3852 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7759 Comm: syz-executor.3 Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================