KCSAN: data-race in pcpu_alloc / pcpu_free

KCSAN: data-race in pcpu_alloc / pcpu_free_area (3)
Status: moderation: reported on 2021/11/29 17:24
Reported-by: syzbot+041c26cb85794b7e414d@syzkaller.appspotmail.com
First crash: 233d, last: 1d13h

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in pcpu_alloc / pcpu_free_area (2)				574	234d	812d	0/22	closed as invalid on 2021/06/07 13:54
upstream	KCSAN: data-race in pcpu_alloc / pcpu_free_area				2	837d	846d	0/22	closed as invalid on 2019/10/15 15:50

Sample crash report:

==================================================================
BUG: KCSAN: data-race in pcpu_alloc / pcpu_free_area

write to 0xffffffff86de8724 of 4 bytes by task 1825 on cpu 1:
 pcpu_update_empty_pages mm/percpu.c:606 [inline]
 pcpu_block_update_hint_free mm/percpu.c:1040 [inline]
 pcpu_free_area+0x545/0x5d0 mm/percpu.c:1298
 free_percpu+0x1d7/0xa30 mm/percpu.c:2281
 xt_percpu_counter_free+0x5f/0x70 net/netfilter/x_tables.c:1950
 cleanup_entry+0x17a/0x1a0 net/ipv4/netfilter/ip_tables.c:656
 __do_replace+0x45e/0x580 net/ipv4/netfilter/ip_tables.c:1085
 do_replace net/ipv4/netfilter/ip_tables.c:1140 [inline]
 do_ipt_set_ctl+0x1466/0x1710 net/ipv4/netfilter/ip_tables.c:1630
 nf_setsockopt+0x1a6/0x1c0 net/netfilter/nf_sockopt.c:101
 ip_setsockopt+0x2815/0x2c80 net/ipv4/ip_sockglue.c:1444
 tcp_setsockopt+0x8c/0xa0 net/ipv4/tcp.c:3685
 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3489
 __sys_setsockopt+0x209/0x2a0 net/socket.c:2180
 __do_sys_setsockopt net/socket.c:2191 [inline]
 __se_sys_setsockopt net/socket.c:2188 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2188
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff86de8724 of 4 bytes by task 1826 on cpu 0:
 pcpu_alloc+0x99c/0xf50 mm/percpu.c:1877
 __alloc_percpu+0x20/0x30 mm/percpu.c:1949
 xt_percpu_counter_alloc+0x6b/0x110 net/netfilter/x_tables.c:1930
 find_check_entry net/ipv6/netfilter/ip6_tables.c:547 [inline]
 translate_table+0xa08/0x10a0 net/ipv6/netfilter/ip6_tables.c:735
 do_replace net/ipv6/netfilter/ip6_tables.c:1153 [inline]
 do_ip6t_set_ctl+0x14c7/0x17e0 net/ipv6/netfilter/ip6_tables.c:1639
 nf_setsockopt+0x1a6/0x1c0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x1c2f/0x3910 net/ipv6/ipv6_sockglue.c:1024
 tcp_setsockopt+0x8c/0xa0 net/ipv4/tcp.c:3685
 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3489
 __sys_setsockopt+0x209/0x2a0 net/socket.c:2180
 __do_sys_setsockopt net/socket.c:2191 [inline]
 __se_sys_setsockopt net/socket.c:2188 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2188
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000027 -> 0x00000028

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1826 Comm: syz-executor.4 Not tainted 5.17.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (143):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2022/01/26 06:56	upstream	0280e3c58f92	2cbffd88	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/25 22:57	upstream	49d766f3a0e4	2cbffd88	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/24 21:26	upstream	dd81e1c7d5fb	2cbffd88	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/24 03:16	upstream	dd81e1c7d5fb	214351e1	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/23 13:38	upstream	e783362eb54c	214351e1	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/22 08:52	upstream	0809edbae347	214351e1	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/21 17:03	upstream	9b57f4589857	214351e1	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/21 05:57	upstream	2c271fe77d52	ab3d9f17	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/20 14:19	upstream	fa2e1ba3e9e3	5da9499f	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/19 08:21	upstream	99613159ad74	0620189b	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/18 18:56	upstream	99613159ad74	731a2d23	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/18 05:56	upstream	e3a8b6a1e70c	731a2d23	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/17 11:59	upstream	0c947b893d69	731a2d23	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/16 21:45	upstream	79e06c4c4950	723cfaf0	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/15 19:02	upstream	a33f5c380c4b	723cfaf0	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/15 04:54	upstream	112450df61b7	723cfaf0	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/14 10:55	upstream	fb3b0673b7d5	b8d780ab	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/13 16:22	upstream	455e73a07f6e	b8d780ab	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/13 13:55	upstream	455e73a07f6e	44d1319a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/11 20:52	upstream	6f38be8f2ccd	44d1319a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/11 12:14	upstream	fe8152b38d3a	1884f55a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/10 21:43	upstream	133d9c53c9dc	ddb0ab8c	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/10 17:43	upstream	df0cc57e057f	ddb0ab8c	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/09 23:37	upstream	df0cc57e057f	2ca0d385	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/08 04:52	upstream	d1587f7bfe9a	2ca0d385	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/07 14:41	upstream	ddec8ed2d490	2ca0d385	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/06 10:33	upstream	75acfdb6fd92	6acc789a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/05 22:18	upstream	49ef78e59b07	6acc789a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/05 19:38	upstream	c9e6606c7fe9	6acc789a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/04 20:25	upstream	c9e6606c7fe9	0a2584dd	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/04 04:51	upstream	c9e6606c7fe9	7f723fbe	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/03 15:09	upstream	c9e6606c7fe9	4a3f34f2	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/03 06:54	upstream	c9e6606c7fe9	e1768e9c	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/02 17:35	upstream	1286cc4893cf	e1768e9c	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/01 19:33	upstream	278218f6778b	e1768e9c	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2022/01/01 03:30	upstream	800829388818	e1768e9c	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/12/31 12:02	upstream	4f3d93c6eaff	36bd2e48	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/12/30 21:47	upstream	9bad743e8d22	2e49f10d	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/12/30 09:51	upstream	eec4df26e24e	2e49f10d	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/12/29 12:33	upstream	e7c124bd0463	6cc879d4	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/12/29 09:59	upstream	e7c124bd0463	76c8cf06	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/12/28 20:42	upstream	ecf71de775a0	76c8cf06	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/12/28 17:27	upstream	a8ad9a2434dc	76c8cf06	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/12/28 01:06	upstream	a8ad9a2434dc	6b3c5e64	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/11/29 14:18	upstream	d58071a8a76d	63eeac02	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/11/28 23:18	upstream	d06c942efea4	63eeac02	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/06/08 01:37	upstream	614124bea77e	b718257f	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area