================================================================== BUG: KCSAN: data-race in __folio_end_writeback / writeout_period write to 0xffffffff86dc5130 of 8 bytes by interrupt on cpu 1: writeout_period+0xa6/0xe0 mm/page-writeback.c:623 call_timer_fn+0x2e/0x240 kernel/time/timer.c:1421 expire_timers+0x116/0x240 kernel/time/timer.c:1466 __run_timers+0x368/0x410 kernel/time/timer.c:1734 run_timer_softirq+0x56/0x60 kernel/time/timer.c:1749 __do_softirq+0x158/0x2de kernel/softirq.c:558 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:920 smpboot_thread_fn+0x308/0x4a0 kernel/smpboot.c:164 kthread+0x2c7/0x2e0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 read to 0xffffffff86dc5130 of 8 bytes by task 9991 on cpu 0: wb_domain_writeout_add mm/page-writeback.c:572 [inline] __wb_writeout_add mm/page-writeback.c:593 [inline] __folio_end_writeback+0x2b3/0x580 mm/page-writeback.c:2821 folio_end_writeback+0x57/0x130 mm/filemap.c:1605 end_page_writeback+0x37/0x50 mm/folio-compat.c:25 __block_write_full_page+0x692/0xa10 fs/buffer.c:1825 block_write_full_page+0x1f0/0x210 blkdev_writepage+0x20/0x30 block/fops.c:391 __writepage+0x38/0xd0 mm/page-writeback.c:2320 write_cache_pages+0x454/0x7f0 mm/page-writeback.c:2255 generic_writepages+0x7c/0xc0 mm/page-writeback.c:2346 blkdev_writepages+0x19/0x20 block/fops.c:428 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364 __writeback_single_inode+0x80/0x4d0 fs/fs-writeback.c:1616 writeback_sb_inodes+0x677/0xdf0 fs/fs-writeback.c:1881 __writeback_inodes_wb+0xb0/0x2b0 fs/fs-writeback.c:1951 wb_writeback+0x280/0x650 fs/fs-writeback.c:2056 wb_check_old_data_flush fs/fs-writeback.c:2156 [inline] wb_do_writeback+0x4b0/0x560 fs/fs-writeback.c:2209 wb_workfn+0xc8/0x440 fs/fs-writeback.c:2238 process_one_work+0x3fc/0x980 kernel/workqueue.c:2298 worker_thread+0x616/0xa70 kernel/workqueue.c:2445 kthread+0x2c7/0x2e0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 value changed: 0x000000010000957c -> 0x000000010000a134 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 9991 Comm: kworker/u4:11 Not tainted 5.16.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) ==================================================================