================================================================== BUG: KCSAN: data-race in __xa_set_mark / writeback_sb_inodes write to 0xffff88811e975b6c of 4 bytes by task 8239 on cpu 0: xa_mark_set lib/xarray.c:69 [inline] xas_set_mark lib/xarray.c:886 [inline] __xa_set_mark+0x317/0x330 lib/xarray.c:1708 __set_page_dirty+0x17e/0x1d0 fs/buffer.c:610 mark_buffer_dirty+0x12e/0x260 fs/buffer.c:1138 __block_commit_write fs/buffer.c:2085 [inline] block_commit_write fs/buffer.c:2477 [inline] block_page_mkwrite+0x25d/0x2e0 fs/buffer.c:2526 ext4_page_mkwrite+0x572/0xae0 fs/ext4/inode.c:5985 do_page_mkwrite mm/memory.c:2527 [inline] wp_page_shared+0x2b9/0x760 mm/memory.c:2855 do_wp_page+0xb67/0xd30 mm/memory.c:2973 handle_pte_fault mm/memory.c:4243 [inline] __handle_mm_fault mm/memory.c:4357 [inline] handle_mm_fault+0x16f5/0x1930 mm/memory.c:4394 do_user_addr_fault+0x393/0x810 arch/x86/mm/fault.c:1295 handle_page_fault arch/x86/mm/fault.c:1365 [inline] exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1418 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565 read to 0xffff88811e975b6c of 4 bytes by task 25 on cpu 1: xa_marked include/linux/xarray.h:416 [inline] mapping_tagged include/linux/fs.h:523 [inline] requeue_inode fs/fs-writeback.c:1401 [inline] writeback_sb_inodes+0x818/0xe40 fs/fs-writeback.c:1743 wb_writeback+0x2b8/0x730 fs/fs-writeback.c:1892 wb_do_writeback+0x108/0x610 fs/fs-writeback.c:2037 wb_workfn+0xc8/0x460 fs/fs-writeback.c:2078 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 25 Comm: kworker/u4:2 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) ==================================================================