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BUG: KCSAN: data-race in __mark_inode_dirty / inode_sync_complete

read to 0xffff8880bb406880 of 8 bytes by task 1954 on cpu 0:
 __mark_inode_dirty+0xb8/0x940 fs/fs-writeback.c:2272
 __set_page_dirty_buffers+0x1f3/0x280 fs/buffer.c:648
 ext4_set_page_dirty+0xc0/0x190 fs/ext4/inode.c:3899
 set_page_dirty+0x126/0x2b0 mm/page-writeback.c:2572
 fault_dirty_shared_page.isra.0+0x49/0x100 mm/memory.c:2237
 wp_page_shared mm/memory.c:2523 [inline]
 do_wp_page+0xdf9/0x11f0 mm/memory.c:2619
 handle_pte_fault mm/memory.c:3865 [inline]
 __handle_mm_fault+0x1ab1/0x2c70 mm/memory.c:3973
 handle_mm_fault+0x21b/0x530 mm/memory.c:4010
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506
 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202

write to 0xffff8880bb406880 of 8 bytes by task 10948 on cpu 1:
 inode_sync_complete+0x3a/0x70 fs/fs-writeback.c:1197
 writeback_sb_inodes+0x791/0xa50 fs/fs-writeback.c:1744
 wb_writeback+0x1f9/0x6a0 fs/fs-writeback.c:1892
 wb_do_writeback fs/fs-writeback.c:2037 [inline]
 wb_workfn+0x22e/0x970 fs/fs-writeback.c:2078
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269
 worker_thread+0xa0/0x800 kernel/workqueue.c:2415
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10948 Comm: kworker/u4:6 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
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