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BUG: KCSAN: data-race in __mark_inode_dirty / other_inode_match

write to 0xffff888128ff2380 of 8 bytes by task 3670 on cpu 1:
 __mark_inode_dirty+0x1ce/0x940 fs/fs-writeback.c:2289
 generic_update_time+0x184/0x270 fs/inode.c:1667
 update_time fs/inode.c:1683 [inline]
 touch_atime+0x172/0x190 fs/inode.c:1754
 get_link fs/namei.c:1054 [inline]
 trailing_symlink+0x1be/0x5a0 fs/namei.c:2253
 path_mountpoint+0x614/0xd60 fs/namei.c:2686
 filename_mountpoint+0x134/0x270 fs/namei.c:2707
 user_path_mountpoint_at+0x43/0x60 fs/namei.c:2737
 ksys_umount+0xdb/0xab0 fs/namespace.c:1683
 __do_sys_umount fs/namespace.c:1709 [inline]
 __se_sys_umount fs/namespace.c:1707 [inline]
 __x64_sys_umount+0x3a/0x50 fs/namespace.c:1707
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888128ff2380 of 8 bytes by task 3764 on cpu 0:
 other_inode_match+0x6b/0x5c0 fs/ext4/inode.c:5156
 find_inode_nowait+0x135/0x160 fs/inode.c:1437
 ext4_update_other_inodes_time fs/ext4/inode.c:5204 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5330 [inline]
 ext4_mark_iloc_dirty+0x12a8/0x1580 fs/ext4/inode.c:5876
 ext4_mark_inode_dirty+0xe9/0x420 fs/ext4/inode.c:6055
 __ext4_ext_dirty+0x101/0x120 fs/ext4/extents.c:165
 ext4_ext_remove_space+0x1cb4/0x32c0 fs/ext4/extents.c:3180
 ext4_ext_truncate+0x120/0x130 fs/ext4/extents.c:4599
 ext4_truncate+0x5a2/0x990 fs/ext4/inode.c:4511
 ext4_evict_inode+0x5d0/0xdb0 fs/ext4/inode.c:289
 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:2449 [inline]
 d_delete+0xdb/0xe0 fs/dcache.c:2438
 vfs_rmdir fs/namei.c:3884 [inline]
 vfs_rmdir+0x2e2/0x300 fs/namei.c:3849
 do_rmdir+0x2cb/0x300 fs/namei.c:3932
 __do_sys_rmdir fs/namei.c:3950 [inline]
 __se_sys_rmdir fs/namei.c:3948 [inline]
 __x64_sys_rmdir+0x2f/0x40 fs/namei.c:3948
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3764 Comm: syz-executor.2 Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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