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BUG: KCSAN: data-race in inode_permission / inode_permission

write to 0xffff88812551f1ea of 2 bytes by task 21910 on cpu 0:
 do_inode_permission fs/namei.c:388 [inline]
 inode_permission+0x34e/0x370 fs/namei.c:449
 may_open.isra.0+0x144/0x250 fs/namei.c:3048
 do_last fs/namei.c:3486 [inline]
 path_openat+0xdc0/0x3150 fs/namei.c:3607
 do_filp_open+0x11e/0x1b0 fs/namei.c:3637
 do_sys_openat2+0x4f5/0x620 fs/open.c:1149
 do_sys_open+0xa3/0x110 fs/open.c:1165
 ksys_open include/linux/syscalls.h:1386 [inline]
 __do_sys_creat fs/open.c:1233 [inline]
 __se_sys_creat fs/open.c:1231 [inline]
 __x64_sys_creat+0x45/0x60 fs/open.c:1231
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812551f1ea of 2 bytes by task 21905 on cpu 1:
 do_inode_permission fs/namei.c:382 [inline]
 inode_permission+0x4e/0x370 fs/namei.c:449
 may_open.isra.0+0x144/0x250 fs/namei.c:3048
 do_last fs/namei.c:3486 [inline]
 path_openat+0xdc0/0x3150 fs/namei.c:3607
 do_filp_open+0x11e/0x1b0 fs/namei.c:3637
 do_sys_openat2+0x4f5/0x620 fs/open.c:1149
 do_sys_open+0xa3/0x110 fs/open.c:1165
 ksys_open include/linux/syscalls.h:1386 [inline]
 __do_sys_open fs/open.c:1171 [inline]
 __se_sys_open fs/open.c:1169 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1169
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 21905 Comm: syz-executor.0 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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