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BUG: KCSAN: data-race in __ext4_update_other_inode_time / __mark_inode_dirty

write to 0xffff88810660daf8 of 8 bytes by task 622 on cpu 1:
 __ext4_update_other_inode_time+0xc8/0x5c0 fs/ext4/inode.c:4970
 ext4_update_other_inodes_time fs/ext4/inode.c:5006 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5135 [inline]
 ext4_mark_iloc_dirty+0x12b6/0x1750 fs/ext4/inode.c:5724
 __ext4_mark_inode_dirty+0x4db/0x5b0 fs/ext4/inode.c:5918
 __ext4_new_inode+0x2a78/0x2f70 fs/ext4/ialloc.c:1337
 ext4_symlink+0x2c3/0x700 fs/ext4/namei.c:3463
 vfs_symlink+0x23a/0x300 fs/namei.c:4172
 do_symlinkat+0xeb/0x280 fs/namei.c:4202
 __do_sys_symlink fs/namei.c:4223 [inline]
 __se_sys_symlink fs/namei.c:4221 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4221
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810660daf8 of 8 bytes by task 1765 on cpu 0:
 __mark_inode_dirty+0x408/0x6c0 fs/fs-writeback.c:2350
 generic_update_time fs/inode.c:1772 [inline]
 update_time fs/inode.c:1785 [inline]
 touch_atime+0x170/0x240 fs/inode.c:1856
 pick_link fs/namei.c:1723 [inline]
 step_into+0x869/0xec0 fs/namei.c:1798
 walk_component+0x190/0x350 fs/namei.c:1948
 lookup_last fs/namei.c:2397 [inline]
 path_lookupat+0x12d/0x570 fs/namei.c:2421
 filename_lookup+0xff/0x390 fs/namei.c:2454
 user_path_at_empty+0x3b/0x50 fs/namei.c:2734
 user_path_at include/linux/namei.h:60 [inline]
 ksys_umount fs/namespace.c:1776 [inline]
 __do_sys_umount fs/namespace.c:1784 [inline]
 __se_sys_umount fs/namespace.c:1782 [inline]
 __x64_sys_umount+0x75/0xd0 fs/namespace.c:1782
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1765 Comm: syz-executor.5 Tainted: G        W         5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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