KCSAN: data-race in pcpu_alloc / pcpu_free

KCSAN: data-race in pcpu_alloc / pcpu_free_area (2)
Status: closed as invalid on 2021/06/07 13:54
Reported-by: syzbot+0b3bfb9cbec193033650@syzkaller.appspotmail.com
First crash: 724d, last: 130d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in pcpu_alloc / pcpu_free_area				2	733d	742d	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 0xffffffff8455f74c of 4 bytes by task 1761 on cpu 1:
 pcpu_update_empty_pages mm/percpu.c:559 [inline]
 pcpu_block_update_hint_free mm/percpu.c:994 [inline]
 pcpu_free_area+0x50c/0x5a0 mm/percpu.c:1254
 free_percpu+0x1d2/0x690 mm/percpu.c:2102
 xt_percpu_counter_free+0x5f/0x70 net/netfilter/x_tables.c:1889
 cleanup_entry+0x170/0x1a0 net/ipv6/netfilter/ip6_tables.c:672
 __do_replace+0x46e/0x590 net/ipv6/netfilter/ip6_tables.c:1101
 do_replace net/ipv6/netfilter/ip6_tables.c:1156 [inline]
 do_ip6t_set_ctl+0x6b5/0x16d0 net/ipv6/netfilter/ip6_tables.c:1638
 nf_setsockopt+0x1a6/0x1c0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x1af1/0x3410 net/ipv6/ipv6_sockglue.c:1008
 tcp_setsockopt+0x8c/0xa0 net/ipv4/tcp.c:3656
 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3265
 __sys_setsockopt+0x18f/0x200 net/socket.c:2117
 __do_sys_setsockopt net/socket.c:2128 [inline]
 __se_sys_setsockopt net/socket.c:2125 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2125
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff8455f74c of 4 bytes by task 1770 on cpu 0:
 pcpu_alloc+0xa33/0x1200 mm/percpu.c:1835
 __alloc_percpu+0x20/0x30 mm/percpu.c:1907
 xt_percpu_counter_alloc+0x6b/0x110 net/netfilter/x_tables.c:1869
 find_check_entry net/ipv6/netfilter/ip6_tables.c:546 [inline]
 translate_table+0x9f2/0x1070 net/ipv6/netfilter/ip6_tables.c:734
 do_replace net/ipv6/netfilter/ip6_tables.c:1152 [inline]
 do_ip6t_set_ctl+0x668/0x16d0 net/ipv6/netfilter/ip6_tables.c:1638
 nf_setsockopt+0x1a6/0x1c0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x1af1/0x3410 net/ipv6/ipv6_sockglue.c:1008
 tcp_setsockopt+0x8c/0xa0 net/ipv4/tcp.c:3656
 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3265
 __sys_setsockopt+0x18f/0x200 net/socket.c:2117
 __do_sys_setsockopt net/socket.c:2128 [inline]
 __se_sys_setsockopt net/socket.c:2125 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2125
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000003 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1770 Comm: syz-executor.4 Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (574):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/06/07 11:13	upstream	614124bea77e	e59537be	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/06/03 05:49	upstream	324c92e5e0ee	0740de69	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/05/28 08:27	upstream	97e5bf604b7a	858ea628	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/05/25 02:54	upstream	1434a3127887	3c7fef33	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/05/22 07:23	upstream	45af60e7ced0	3c7fef33	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/05/20 23:11	upstream	f01da525b3de	c560a65d	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/05/19 20:17	upstream	c3d0e3fd41b7	a343ba6b	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/05/18 23:03	upstream	8ac91e6c6033	a343ba6b	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/05/17 01:47	upstream	63d1cb53e26a	f54a5c09	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/05/13 16:50	upstream	c06a2ba62fc4	ecb594cb	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/05/09 16:57	upstream	b741596468b0	bc5434be	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/05/08 08:46	upstream	1ad77a05cfae	bc5434be	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/05/04 14:35	upstream	5e321ded302d	06c27ff5	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/27 01:29	upstream	9f4ad9e425a1	8ee2dea6	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/26 15:18	upstream	9f4ad9e425a1	805b5003	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/22 17:57	upstream	16fc44d6387e	33c28d03	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/21 13:48	upstream	1fe5501ba1ab	95777977	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/18 02:21	upstream	194cf4825638	7e2b734b	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/16 20:48	upstream	2f7b98d1e55c	7e2b734b	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/15 22:55	upstream	7f75285ca572	c59079a6	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/14 22:58	upstream	7f75285ca572	fcdb12ba	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/14 10:17	upstream	50987beca096	3134b37f	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/13 22:18	upstream	eebe426d32e1	a184b83e	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/12 23:00	upstream	89698becf06d	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/12 09:47	upstream	d434405aaab7	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/11 20:09	upstream	7d900724913c	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/10 15:23	upstream	d4961772226d	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/10 00:54	upstream	4e04e7513b0f	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/09 15:00	upstream	17e7124aad76	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/08 09:01	upstream	454859c552da	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/07 19:24	upstream	3a22981230f9	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/06 22:26	upstream	2d743660786e	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/05 20:00	upstream	0a50438c8436	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/04 03:25	upstream	2023a53bdf41	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/03 13:54	upstream	d93a0d43e3d0	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/02 23:45	upstream	0a84c2e440f7	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/04/02 07:23	upstream	1678e493d530	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/03/30 16:29	upstream	2bb25b3a748a	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/03/29 21:33	upstream	1e43c377a79f	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/03/29 10:29	upstream	a5e13c6df0e4	a8529b82	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/03/28 20:19	upstream	36a14638f7c0	a8529b82	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/03/27 02:09	upstream	0f4498cef9f5	a8529b82	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/03/26 11:21	upstream	db24726bfefa	a8529b82	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/03/25 22:05	upstream	002322402daf	6a383ecf	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/03/25 08:37	upstream	e138138003eb	6a383ecf	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_free_area
ci2-upstream-kcsan-gce	2021/01/15 19:19	upstream	5ee88057889b	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2019/10/23 05:09	https://github.com/google/ktsan.git kcsan	05f2236801fe	d0686497	.config	log	report