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BUG: KCSAN: data-race in inode_permission / inode_permission

read-write to 0xffff88812735904a of 2 bytes by task 1 on cpu 1:
 do_inode_permission fs/namei.c:402 [inline]
 inode_permission+0x30c/0x320 fs/namei.c:463
 may_open+0x19f/0x2e0 fs/namei.c:2875
 do_open fs/namei.c:3250 [inline]
 path_openat+0x17ac/0x20a0 fs/namei.c:3369
 do_filp_open+0xbd/0x1d0 fs/namei.c:3396
 do_sys_openat2+0xa3/0x240 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_open fs/open.c:1192 [inline]
 __se_sys_open fs/open.c:1188 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1188
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812735904a of 2 bytes by task 4889 on cpu 0:
 do_inode_permission fs/namei.c:396 [inline]
 inode_permission+0x41/0x320 fs/namei.c:463
 may_open+0x19f/0x2e0 fs/namei.c:2875
 do_open fs/namei.c:3250 [inline]
 path_openat+0x17ac/0x20a0 fs/namei.c:3369
 do_filp_open+0xbd/0x1d0 fs/namei.c:3396
 do_sys_openat2+0xa3/0x240 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_sys_open fs/open.c:1192 [inline]
 __se_sys_open fs/open.c:1188 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1188
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4889 Comm: systemd-journal Not tainted 5.10.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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