================================================================== BUG: KCSAN: data-race in ext4_ext_handle_unwritten_extents / ext4_mark_iloc_dirty write to 0xffff888138cee4fc of 2 bytes by task 26 on cpu 1: ext4_ext_mark_initialized fs/ext4/ext4_extents.h:218 [inline] ext4_convert_unwritten_extents_endio fs/ext4/extents.c:3716 [inline] ext4_ext_handle_unwritten_extents+0x62e/0xa90 fs/ext4/extents.c:3849 ext4_ext_map_blocks+0x728/0x1fc0 fs/ext4/extents.c:4119 ext4_map_blocks+0x700/0xfc0 fs/ext4/inode.c:628 ext4_convert_unwritten_extents+0x15a/0x2c0 fs/ext4/extents.c:4760 ext4_convert_unwritten_io_end_vec+0xa4/0x130 fs/ext4/extents.c:4799 ext4_end_io_end fs/ext4/page-io.c:187 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:260 [inline] ext4_end_io_rsv_work+0x198/0x360 fs/ext4/page-io.c:274 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272 worker_thread+0x635/0xb90 kernel/workqueue.c:2418 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff888138cee4fc of 4 bytes by task 6188 on cpu 0: ext4_do_update_inode fs/ext4/inode.c:5105 [inline] ext4_mark_iloc_dirty+0xd80/0x1650 fs/ext4/inode.c:5712 __ext4_mark_inode_dirty+0x450/0x610 fs/ext4/inode.c:5906 ext4_dirty_inode+0xa6/0xc0 fs/ext4/inode.c:5942 __mark_inode_dirty+0x74/0x740 fs/fs-writeback.c:2260 mark_inode_dirty include/linux/fs.h:2183 [inline] generic_write_end+0x15e/0x250 fs/buffer.c:2202 ext4_da_write_end+0x59b/0x760 fs/ext4/inode.c:3102 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3340 ext4_buffered_write_iter+0x2e5/0x3d0 fs/ext4/file.c:270 ext4_file_write_iter+0x45e/0x1090 fs/ext4/file.c:503 call_write_iter include/linux/fs.h:1903 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6d4/0x7c0 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 6188 Comm: syz-executor.1 Not tainted 5.10.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================