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BUG: KCSAN: data-race in path_noexec / propagate_one

write to 0xffff88812a659c30 of 4 bytes by task 20072 on cpu 1:
 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:2784 [inline]
 do_new_mount_fc fs/namespace.c:2823 [inline]
 do_new_mount fs/namespace.c:2877 [inline]
 do_mount+0x1ad5/0x1c00 fs/namespace.c:3200
 __do_sys_mount fs/namespace.c:3410 [inline]
 __se_sys_mount+0xd3/0x100 fs/namespace.c:3387
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3387
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812a659c30 of 4 bytes by task 20069 on cpu 0:
 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
 vm_mmap+0x8c/0xb0 mm/util.c:525
 elf_map+0x139/0x240 fs/binfmt_elf.c:385
 load_elf_binary+0xd2b/0x2eb0 fs/binfmt_elf.c:1110
 search_binary_handler fs/exec.c:1749 [inline]
 exec_binprm+0x1d9/0x760 fs/exec.c:1790
 __do_execve_file+0xf39/0x12a0 fs/exec.c:1926
 do_execveat_common fs/exec.c:1980 [inline]
 do_execve+0x2f/0x40 fs/exec.c:1997
 call_usermodehelper_exec_async+0x206/0x2e0 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20069 Comm: modprobe Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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