================================================================== BUG: KCSAN: data-race in __writeback_single_inode / __xa_set_mark write to 0xffff88800980fd04 of 4 bytes by task 12034 on cpu 1: xa_mark_set lib/xarray.c:69 [inline] xas_set_mark lib/xarray.c:889 [inline] __xa_set_mark+0x187/0x1b0 lib/xarray.c:1898 __set_page_dirty+0x17e/0x1d0 fs/buffer.c:609 mark_buffer_dirty+0x126/0x230 fs/buffer.c:1137 __block_commit_write fs/buffer.c:2084 [inline] block_commit_write fs/buffer.c:2476 [inline] block_page_mkwrite+0x25d/0x2e0 fs/buffer.c:2525 ext4_page_mkwrite+0x736/0xf40 fs/ext4/inode.c:6092 do_page_mkwrite mm/memory.c:2714 [inline] wp_page_shared+0x2a7/0x7c0 mm/memory.c:3045 do_wp_page+0x676/0x6c0 mm/memory.c:3138 handle_pte_fault mm/memory.c:4405 [inline] __handle_mm_fault mm/memory.c:4522 [inline] handle_mm_fault+0x1407/0x17b0 mm/memory.c:4620 do_user_addr_fault+0x433/0x830 arch/x86/mm/fault.c:1393 handle_page_fault arch/x86/mm/fault.c:1450 [inline] exc_page_fault+0x94/0x2a0 arch/x86/mm/fault.c:1506 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:580 read to 0xffff88800980fd04 of 4 bytes by task 6280 on cpu 0: xa_marked include/linux/xarray.h:416 [inline] mapping_tagged include/linux/fs.h:488 [inline] __writeback_single_inode+0x25f/0x560 fs/fs-writeback.c:1507 writeback_sb_inodes+0x6a0/0x1020 fs/fs-writeback.c:1721 wb_writeback+0x27d/0x660 fs/fs-writeback.c:1894 wb_do_writeback+0x101/0x5d0 fs/fs-writeback.c:2039 wb_workfn+0xb8/0x410 fs/fs-writeback.c:2080 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x635/0xb90 kernel/workqueue.c:2421 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 6280 Comm: kworker/u4:5 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) ==================================================================