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BUG: KCSAN: data-race in atime_needs_update / propagate_one

write to 0xffff8881015dd2f0 of 4 bytes by task 15106 on cpu 1:
 propagate_one fs/pnode.c:269 [inline]
 propagate_one+0x3b3/0x550 fs/pnode.c:225
 propagate_mnt+0x22e/0x270 fs/pnode.c:320
 attach_recursive_mnt+0x66d/0x8a0 fs/namespace.c:2071
 graft_tree+0x107/0x160 fs/namespace.c:2179
 do_add_mount.isra.0+0x102/0x190 fs/namespace.c:2725
 do_new_mount_fc fs/namespace.c:2764 [inline]
 do_new_mount fs/namespace.c:2818 [inline]
 do_mount+0x12d5/0x1590 fs/namespace.c:3141
 __do_sys_mount fs/namespace.c:3350 [inline]
 __se_sys_mount fs/namespace.c:3327 [inline]
 __x64_sys_mount+0x12b/0x1a0 fs/namespace.c:3327
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881015dd2f0 of 4 bytes by task 9639 on cpu 0:
 atime_needs_update+0x1c0/0x360 fs/inode.c:1733
 touch_atime+0x63/0x150 fs/inode.c:1748
 file_accessed include/linux/fs.h:2226 [inline]
 iterate_dir+0x26d/0x360 fs/readdir.c:70
 __do_sys_getdents fs/readdir.c:285 [inline]
 __se_sys_getdents fs/readdir.c:267 [inline]
 __x64_sys_getdents+0x14b/0x2b0 fs/readdir.c:267
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9639 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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