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BUG: KCSAN: data-race in inode_permission / inode_permission

write to 0xffff88810adadca2 of 2 bytes by task 16020 on cpu 0:
 do_inode_permission fs/namei.c:450 [inline]
 inode_permission+0x337/0x350 fs/namei.c:513
 may_open+0x1a7/0x2f0 fs/namei.c:2985
 do_open fs/namei.c:3365 [inline]
 path_openat+0x1874/0x21b0 fs/namei.c:3500
 do_filp_open+0xd9/0x1f0 fs/namei.c:3527
 do_sys_openat2+0xa3/0x250 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_openat fs/open.c:1219 [inline]
 __se_sys_openat fs/open.c:1214 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1214
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810adadca2 of 2 bytes by task 16017 on cpu 1:
 do_inode_permission fs/namei.c:444 [inline]
 inode_permission+0x45/0x350 fs/namei.c:513
 may_open+0x1a7/0x2f0 fs/namei.c:2985
 do_open fs/namei.c:3365 [inline]
 path_openat+0x1874/0x21b0 fs/namei.c:3500
 do_filp_open+0xd9/0x1f0 fs/namei.c:3527
 do_sys_openat2+0xa3/0x250 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_openat fs/open.c:1219 [inline]
 __se_sys_openat fs/open.c:1214 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1214
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16017 Comm: syz-executor.3 Tainted: G        W         5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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