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BUG: KCSAN: data-race in other_inode_match / writeback_sb_inodes

write to 0xffff8881252d0180 of 8 bytes by task 8094 on cpu 0:
 writeback_sb_inodes+0x38d/0xa50 fs/fs-writeback.c:1705
 __writeback_inodes_wb+0xe8/0x1b0 fs/fs-writeback.c:1785
 wb_writeback+0x557/0x6a0 fs/fs-writeback.c:1894
 wb_check_old_data_flush fs/fs-writeback.c:1996 [inline]
 wb_do_writeback fs/fs-writeback.c:2049 [inline]
 wb_workfn+0x7bb/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

read to 0xffff8881252d0180 of 8 bytes by task 8054 on cpu 1:
 other_inode_match+0x6b/0x5c0 fs/ext4/inode.c:4820
 find_inode_nowait+0x135/0x160 fs/inode.c:1437
 ext4_update_other_inodes_time fs/ext4/inode.c:4868 [inline]
 ext4_do_update_inode fs/ext4/inode.c:4994 [inline]
 ext4_mark_iloc_dirty+0x12a8/0x1580 fs/ext4/inode.c:5547
 ext4_mark_inode_dirty+0xe9/0x420 fs/ext4/inode.c:5740
 ext4_truncate+0x65e/0x9d0 fs/ext4/inode.c:4198
 ext4_evict_inode+0x679/0xe50 fs/ext4/inode.c:272
 evict+0x244/0x410 fs/inode.c:574
 iput_final fs/inode.c:1563 [inline]
 iput+0x371/0x4e0 fs/inode.c:1589
 dentry_unlink_inode+0x270/0x2e0 fs/dcache.c:374
 d_delete fs/dcache.c:2451 [inline]
 d_delete+0xdb/0xe0 fs/dcache.c:2440
 vfs_rmdir fs/namei.c:3896 [inline]
 vfs_rmdir+0x2e2/0x300 fs/namei.c:3861
 do_rmdir+0x2cb/0x300 fs/namei.c:3944
 __do_sys_rmdir fs/namei.c:3962 [inline]
 __se_sys_rmdir fs/namei.c:3960 [inline]
 __x64_sys_rmdir+0x2f/0x40 fs/namei.c:3960
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8054 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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