KCSAN: data-race in d_alloc_parallel / d_set_d

similar bugs (6):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in d_alloc_parallel / d_set_d_op (4)	1	674d	674d	0/24	auto-closed as invalid on 2021/03/08 01:09
upstream	KCSAN: data-race in d_alloc_parallel / d_set_d_op	23	971d	1135d	0/24	auto-closed as invalid on 2020/06/18 13:33
upstream	KCSAN: data-race in d_alloc_parallel / d_set_d_op (2)	1	834d	834d	0/24	auto-closed as invalid on 2020/09/29 03:57
upstream	KCSAN: data-race in d_alloc_parallel / d_set_d_op (6)	3	260d	306d	0/24	auto-closed as invalid on 2022/04/26 06:41
upstream	KCSAN: data-race in d_alloc_parallel / d_set_d_op (3)	2	738d	730d	0/24	auto-closed as invalid on 2021/01/03 18:19
upstream	KCSAN: data-race in d_alloc_parallel / d_set_d_op (5)	13	544d	633d	0/24	auto-closed as invalid on 2021/07/16 11:19

==================================================================
BUG: KCSAN: data-race in d_alloc_parallel / d_set_d_op

read-write to 0xffff88811f314240 of 4 bytes by task 20684 on cpu 0:
 d_set_d_op+0xf0/0x1e0 fs/dcache.c:1932
 proc_pident_instantiate+0x164/0x180 fs/proc/base.c:2625
 proc_pident_lookup fs/proc/base.c:2648 [inline]
 proc_tgid_base_lookup+0x10c/0x180 fs/proc/base.c:3331
 __lookup_slow+0x182/0x250 fs/namei.c:1701
 lookup_slow+0x3c/0x60 fs/namei.c:1718
 walk_component+0x23d/0x280 fs/namei.c:2014
 link_path_walk+0x459/0x7a0
 path_openat+0x199/0x1b30 fs/namei.c:3649
 do_filp_open+0x105/0x220 fs/namei.c:3680
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1278
 do_sys_open fs/open.c:1294 [inline]
 __do_sys_openat fs/open.c:1310 [inline]
 __se_sys_openat fs/open.c:1305 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1305
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffff88811f314240 of 4 bytes by task 20683 on cpu 1:
 d_in_lookup include/linux/dcache.h:356 [inline]
 d_wait_lookup fs/dcache.c:2582 [inline]
 d_alloc_parallel+0x655/0xcc0 fs/dcache.c:2670
 __lookup_slow+0x80/0x250 fs/namei.c:1686
 lookup_slow+0x3c/0x60 fs/namei.c:1718
 walk_component+0x23d/0x280 fs/namei.c:2014
 link_path_walk+0x459/0x7a0
 path_openat+0x199/0x1b30 fs/namei.c:3649
 do_filp_open+0x105/0x220 fs/namei.c:3680
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1278
 do_sys_open fs/open.c:1294 [inline]
 __do_sys_openat fs/open.c:1310 [inline]
 __se_sys_openat fs/open.c:1305 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1305
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x10000000 -> 0x1000000c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20683 Comm: syz-executor.4 Not tainted 5.19.0-rc3-syzkaller-00043-g3abc3ae553c7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2022/06/23 04:59	upstream	3abc3ae553c7	912f5df7	.config	log	report	info	KCSAN: data-race in d_alloc_parallel / d_set_d_op
ci2-upstream-kcsan-gce	2022/06/02 06:31	upstream	8eca6b0a647a	b4bc6a3d	.config	log	report	info	KCSAN: data-race in d_alloc_parallel / d_set_d_op
ci2-upstream-kcsan-gce	2022/05/05 16:23	upstream	a7391ad35724	b3f09415	.config	log	report	info	KCSAN: data-race in d_alloc_parallel / d_set_d_op
ci2-upstream-kcsan-gce	2022/04/28 07:37	upstream	8f4dd16603ce	8a1f1f07	.config	log	report	info	KCSAN: data-race in d_alloc_parallel / d_set_d_op