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BUG: KCSAN: data-race in inode_permission / inode_permission

write to 0xffff88810685e202 of 2 bytes by task 1784 on cpu 0:
 do_inode_permission fs/namei.c:450 [inline]
 inode_permission+0x258/0x290 fs/namei.c:513
 may_lookup fs/namei.c:1655 [inline]
 link_path_walk+0x17d/0x780 fs/namei.c:2211
 path_parentat fs/namei.c:2473 [inline]
 filename_parentat+0x104/0x950 fs/namei.c:2495
 filename_create+0x58/0x3c0 fs/namei.c:3575
 user_path_create fs/namei.c:3650 [inline]
 do_mkdirat+0x59/0x200 fs/namei.c:3828
 __do_sys_mkdir fs/namei.c:3856 [inline]
 __se_sys_mkdir fs/namei.c:3854 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3854
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810685e202 of 2 bytes by task 1785 on cpu 1:
 do_inode_permission fs/namei.c:444 [inline]
 inode_permission+0x3e/0x290 fs/namei.c:513
 may_lookup fs/namei.c:1655 [inline]
 link_path_walk+0x17d/0x780 fs/namei.c:2211
 path_parentat fs/namei.c:2473 [inline]
 filename_parentat+0x104/0x950 fs/namei.c:2495
 filename_create+0x58/0x3c0 fs/namei.c:3575
 user_path_create fs/namei.c:3650 [inline]
 do_mkdirat+0x59/0x200 fs/namei.c:3828
 __do_sys_mkdir fs/namei.c:3856 [inline]
 __se_sys_mkdir fs/namei.c:3854 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3854
 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: 1 PID: 1785 Comm: syz-executor.0 Not tainted 5.13.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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cgroup: Unknown subsys name 'perf_event'
cgroup: Unknown subsys name 'net_cls'