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BUG: KCSAN: data-race in __mark_inode_dirty / move_expired_inodes

write to 0xffff888106017240 of 8 bytes by task 3340 on cpu 0:
 move_expired_inodes+0x1ca/0x4a0 fs/fs-writeback.c:1257
 queue_io+0xe1/0x2e0 fs/fs-writeback.c:1304
 wb_writeback+0x265/0x6f0 fs/fs-writeback.c:1892
 wb_do_writeback+0x101/0x5f0 fs/fs-writeback.c:2039
 wb_workfn+0xc8/0x470 fs/fs-writeback.c:2080
 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x20d/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff888106017240 of 8 bytes by task 9781 on cpu 1:
 __mark_inode_dirty+0xb9/0x7f0 fs/fs-writeback.c:2274
 __set_page_dirty_buffers+0x180/0x1f0 fs/buffer.c:673
 ext4_set_page_dirty+0xdd/0x110 fs/ext4/inode.c:3601
 set_page_dirty+0x104/0x200 mm/page-writeback.c:2580
 set_page_dirty_lock+0x68/0x90 mm/page-writeback.c:2605
 bio_release_pages+0x18e/0x330 block/bio.c:959
 bio_dirty_fn+0x6d/0xa0 block/bio.c:1356
 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x20d/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: 9781 Comm: kworker/1:4 Not tainted 5.9.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events bio_dirty_fn
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