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BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes

read to 0xffff8881254f2400 of 8 bytes by task 4609 on cpu 1:
 __mark_inode_dirty+0xb8/0x940 fs/fs-writeback.c:2272
 generic_update_time+0x184/0x270 fs/inode.c:1667
 update_time fs/inode.c:1683 [inline]
 touch_atime+0x172/0x190 fs/inode.c:1754
 file_accessed include/linux/fs.h:2209 [inline]
 iterate_dir+0x232/0x380 fs/readdir.c:70
 __do_sys_getdents fs/readdir.c:285 [inline]
 __se_sys_getdents fs/readdir.c:266 [inline]
 __x64_sys_getdents+0x14b/0x280 fs/readdir.c:266
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8881254f2400 of 8 bytes by task 1009 on cpu 0:
 writeback_sb_inodes+0x38d/0xa50 fs/fs-writeback.c:1705
 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:2264
 worker_thread+0xa0/0x800 kernel/workqueue.c:2410
 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: 0 PID: 1009 Comm: kworker/u4:4 Not tainted 5.5.0-rc1-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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