KCSAN: data-race in inode_permission / inode

similar bugs (4):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in inode_permission / inode_permission (4)	1	824d	790d	0/24	auto-closed as invalid on 2020/12/21 11:15
upstream	KCSAN: data-race in inode_permission / inode_permission (5)	12	616d	725d	0/24	auto-closed as invalid on 2021/07/04 17:17
upstream	KCSAN: data-race in inode_permission / inode_permission (2)	1	936d	936d	0/24	auto-closed as invalid on 2020/08/17 22:52
upstream	KCSAN: data-race in inode_permission / inode_permission	27	1039d	1199d	0/24	auto-closed as invalid on 2020/06/11 10:47

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BUG: KCSAN: data-race in inode_permission / inode_permission

write to 0xffff8880b910daea of 2 bytes by task 1 on cpu 0:
 do_inode_permission fs/namei.c:402 [inline]
 inode_permission+0x314/0x330 fs/namei.c:463
 may_lookup fs/namei.c:1569 [inline]
 link_path_walk+0x14a/0x730 fs/namei.c:2125
 path_openat+0x199/0x20a0 fs/namei.c:3364
 do_filp_open+0xbd/0x1d0 fs/namei.c:3395
 do_sys_openat2+0x33b/0x500 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 0xffff8880b910daea of 2 bytes by task 4092 on cpu 1:
 do_inode_permission fs/namei.c:396 [inline]
 inode_permission+0x41/0x330 fs/namei.c:463
 may_lookup fs/namei.c:1569 [inline]
 link_path_walk+0x14a/0x730 fs/namei.c:2125
 path_openat+0x199/0x20a0 fs/namei.c:3364
 do_filp_open+0xbd/0x1d0 fs/namei.c:3395
 do_sys_openat2+0x33b/0x500 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: 1 PID: 4092 Comm: syz-executor.3 Not tainted 5.9.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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