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BUG: KCSAN: data-race in path_noexec / propagate_one

write to 0xffff88812b7432f0 of 4 bytes by task 31863 on cpu 0:
 propagate_one+0x32d/0x400 fs/pnode.c:267
 propagate_mnt+0x2f8/0x640 fs/pnode.c:319
 attach_recursive_mnt+0x519/0x1210 fs/namespace.c:2129
 graft_tree fs/namespace.c:2237 [inline]
 do_add_mount fs/namespace.c:2783 [inline]
 do_new_mount_fc fs/namespace.c:2822 [inline]
 do_new_mount fs/namespace.c:2876 [inline]
 do_mount+0x1aa8/0x1bd0 fs/namespace.c:3199
 __do_sys_mount fs/namespace.c:3409 [inline]
 __se_sys_mount+0xd3/0x100 fs/namespace.c:3386
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3386
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812b7432f0 of 4 bytes by task 31862 on cpu 1:
 path_noexec+0x1e/0x70 fs/exec.c:111
 do_mmap+0x8fb/0xcf0 mm/mmap.c:1494
 do_mmap_pgoff include/linux/mm.h:2596 [inline]
 vm_mmap_pgoff+0xed/0x170 mm/util.c:506
 ksys_mmap_pgoff+0x342/0x3a0 mm/mmap.c:1595
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 31862 Comm: modprobe Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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