KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint

KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
Status: moderation: reported on 2019/11/07 05:04
Reported-by: syzbot+73de055cce044f25787d@syzkaller.appspotmail.com
First crash: 767d, last: 2d05h

Sample crash report:

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

write to 0xffffffff86dc55a4 of 4 bytes by task 1829 on cpu 1:
 pcpu_update_empty_pages mm/percpu.c:606 [inline]
 pcpu_block_update_hint_alloc+0x66a/0x730 mm/percpu.c:920
 pcpu_alloc_area+0x4e2/0x510 mm/percpu.c:1254
 pcpu_alloc+0x40f/0xf80 mm/percpu.c:1813
 __alloc_percpu+0x20/0x30 mm/percpu.c:1950
 xt_percpu_counter_alloc+0x6b/0x110 net/netfilter/x_tables.c:1930
 find_check_entry net/ipv4/netfilter/ip_tables.c:528 [inline]
 translate_table+0x995/0xff0 net/ipv4/netfilter/ip_tables.c:718
 do_replace net/ipv4/netfilter/ip_tables.c:1136 [inline]
 do_ipt_set_ctl+0x1419/0x1710 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:3656
 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3478
 __sys_setsockopt+0x209/0x2a0 net/socket.c:2176
 __do_sys_setsockopt net/socket.c:2187 [inline]
 __se_sys_setsockopt net/socket.c:2184 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2184
 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 0xffffffff86dc55a4 of 4 bytes by task 1821 on cpu 0:
 pcpu_alloc+0x9c0/0xf80 mm/percpu.c:1878
 __alloc_percpu+0x20/0x30 mm/percpu.c:1950
 xt_percpu_counter_alloc+0x6b/0x110 net/netfilter/x_tables.c:1930
 find_check_entry net/ipv4/netfilter/ip_tables.c:528 [inline]
 translate_table+0x995/0xff0 net/ipv4/netfilter/ip_tables.c:718
 do_replace net/ipv4/netfilter/ip_tables.c:1136 [inline]
 do_ipt_set_ctl+0x1419/0x1710 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:3656
 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3478
 __sys_setsockopt+0x209/0x2a0 net/socket.c:2176
 __do_sys_setsockopt net/socket.c:2187 [inline]
 __se_sys_setsockopt net/socket.c:2184 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2184
 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: 0x00000030 -> 0x0000002f

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1821 Comm: syz-executor.1 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (486):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/11/25 19:09	upstream	b501b85957de	63eeac02	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/21 13:38	upstream	923dcc5eb0c1	4eb20a4e	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/20 20:42	upstream	61564e7b3abc	4eb20a4e	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/19 12:14	upstream	4c388a8e740d	31a30fc0	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/19 00:01	upstream	6fdf886424cf	31a30fc0	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/18 14:08	upstream	42eb8fdac2fc	31a30fc0	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/17 20:28	upstream	ee1703cda8dc	cafff8b6	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/13 19:38	upstream	a9b9669d9822	75b04091	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/12 13:15	upstream	5833291ab6de	75b04091	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/11 23:48	upstream	ca2ef2d9f2aa	75b04091	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/11 08:06	upstream	debe436e77c7	75b04091	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/10 19:52	upstream	89d714ab6043	75b04091	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/10 13:33	upstream	cb690f5238d7	75b04091	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/10 01:29	upstream	cb690f5238d7	55fa030c	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/09 14:14	upstream	d2f38a3c6507	59bcaf9a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/06 00:32	upstream	fe91c4725aee	4c1be0be	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/11/03 23:07	upstream	dcd68326d29b	4c1be0be	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/10/28 18:00	upstream	1fc596a56b33	be531bb4	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/10/21 05:57	upstream	2f111a6fd5b5	f111d03b	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/10/20 13:31	upstream	d9abdee5fd5a	418a00eb	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/10/20 05:48	upstream	d9abdee5fd5a	466b7db1	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/10/18 19:42	upstream	519d81956ee2	24dc29db	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/10/16 22:26	upstream	304040fb4909	0c5d9412	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/10/08 19:29	upstream	1da38549dd64	efe0f24d	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/10/05 11:05	upstream	f6274b06e326	ce697b49	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/09/27 13:04	upstream	5816b3e6577e	78494d16	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/09/26 01:10	upstream	85736168463d	8cac236e	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/09/15 15:01	upstream	3ca706c189db	07e953c1	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/09/15 04:30	upstream	1619b69edce1	07e953c1	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/09/13 03:58	upstream	6880fa6c5660	3ce60af8	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/09/09 00:59	upstream	2d338201d531	e2776ee4	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/08/31 07:35	upstream	8596e589b787	8f58a0ef	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/08/26 06:17	upstream	fe67f4dd8daa	b599f2fc	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/08/21 20:41	upstream	002c0aef1090	b599f2fc	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/08/16 10:19	upstream	7c60610d4767	6652437d	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/08/11 02:59	upstream	9e723c5380c6	6972b106	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/08/09 22:12	upstream	36a21d51725a	6972b106	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/08/08 10:30	upstream	85a90500f9a1	6972b106	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/08/06 07:35	upstream	902e7f373fff	2f537099	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/08/06 03:25	upstream	e04480920d1e	d2d6e680	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/07/28 16:09	upstream	7d549995d4e0	9a4781d4	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/07/27 21:11	upstream	ff1176468d36	17d6ab15	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/07/04 09:00	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/06/22 19:39	upstream	0c18f29aae7c	aba2b2fb	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/06/20 06:45	upstream	913ec3c22ef4	aba2b2fb	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/06/19 02:26	upstream	b1edae0d5f2e	aba2b2fb	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/06/17 15:50	upstream	70585216fe77	aba2b2fb	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/01/17 10:28	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2019/10/23 00:37	https://github.com/google/ktsan.git kcsan	05f2236801fe	4ee855e7	.config	log	report