================================================================== BUG: KCSAN: data-race in __xa_set_mark / writeback_sb_inodes write to 0xffff88810ec373c4 of 4 bytes by task 573 on cpu 0: xa_mark_set lib/xarray.c:69 [inline] xas_set_mark lib/xarray.c:889 [inline] __xa_set_mark+0x187/0x1b0 lib/xarray.c:1899 __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:2477 [inline] block_page_mkwrite+0x26d/0x320 fs/buffer.c:2526 ext4_page_mkwrite+0x746/0xf50 fs/ext4/inode.c:6087 do_page_mkwrite mm/memory.c:2720 [inline] wp_page_shared+0x2ac/0x7c0 mm/memory.c:3050 do_wp_page+0x6f1/0x740 mm/memory.c:3151 handle_pte_fault mm/memory.c:4336 [inline] __handle_mm_fault mm/memory.c:4453 [inline] handle_mm_fault+0x1463/0x1840 mm/memory.c:4551 do_user_addr_fault+0x60c/0xc00 arch/x86/mm/fault.c:1390 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x94/0x2a0 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577 read to 0xffff88810ec373c4 of 4 bytes by task 449 on cpu 1: xa_marked include/linux/xarray.h:418 [inline] mapping_tagged include/linux/fs.h:490 [inline] requeue_inode fs/fs-writeback.c:1409 [inline] writeback_sb_inodes+0x914/0xff0 fs/fs-writeback.c:1759 wb_writeback+0x27d/0x660 fs/fs-writeback.c:1905 wb_do_writeback+0x101/0x5d0 fs/fs-writeback.c:2050 wb_workfn+0xc8/0x430 fs/fs-writeback.c:2091 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x616/0xa70 kernel/workqueue.c:2421 kthread+0x20b/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 449 Comm: kworker/u4:4 Not tainted 5.12.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) ==================================================================