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: 652d, last: 8d02h

Sample crash report:

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

write to 0xffffffff8418d7cc of 4 bytes by task 1781 on cpu 1:
 pcpu_update_empty_pages mm/percpu.c:607 [inline]
 pcpu_block_update_hint_alloc+0x66a/0x730 mm/percpu.c:921
 pcpu_alloc_area+0x4e2/0x510 mm/percpu.c:1255
 pcpu_alloc+0x400/0xf10 mm/percpu.c:1817
 __alloc_percpu+0x20/0x30 mm/percpu.c:1954
 xt_percpu_counter_alloc+0x6b/0x110 net/netfilter/x_tables.c:1869
 find_check_entry net/ipv4/netfilter/ip_tables.c:527 [inline]
 translate_table+0x97f/0xfc0 net/ipv4/netfilter/ip_tables.c:717
 do_replace net/ipv4/netfilter/ip_tables.c:1135 [inline]
 do_ipt_set_ctl+0x65f/0x1630 net/ipv4/netfilter/ip_tables.c:1629
 nf_setsockopt+0x1a6/0x1c0 net/netfilter/nf_sockopt.c:101
 ip_setsockopt+0x2621/0x2a80 net/ipv4/ip_sockglue.c:1435
 tcp_setsockopt+0x8c/0xa0 net/ipv4/tcp.c:3657
 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3362
 __sys_setsockopt+0x18f/0x200 net/socket.c:2159
 __do_sys_setsockopt net/socket.c:2170 [inline]
 __se_sys_setsockopt net/socket.c:2167 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2167
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff8418d7cc of 4 bytes by task 1776 on cpu 0:
 pcpu_alloc+0x9ce/0xf10 mm/percpu.c:1882
 __alloc_percpu+0x20/0x30 mm/percpu.c:1954
 xt_percpu_counter_alloc+0x6b/0x110 net/netfilter/x_tables.c:1869
 find_check_entry net/ipv4/netfilter/ip_tables.c:527 [inline]
 translate_table+0x97f/0xfc0 net/ipv4/netfilter/ip_tables.c:717
 do_replace net/ipv4/netfilter/ip_tables.c:1135 [inline]
 do_ipt_set_ctl+0x65f/0x1630 net/ipv4/netfilter/ip_tables.c:1629
 nf_setsockopt+0x1a6/0x1c0 net/netfilter/nf_sockopt.c:101
 ip_setsockopt+0x2621/0x2a80 net/ipv4/ip_sockglue.c:1435
 tcp_setsockopt+0x8c/0xa0 net/ipv4/tcp.c:3657
 sock_common_setsockopt+0x5d/0x70 net/core/sock.c:3362
 __sys_setsockopt+0x18f/0x200 net/socket.c:2159
 __do_sys_setsockopt net/socket.c:2170 [inline]
 __se_sys_setsockopt net/socket.c:2167 [inline]
 __x64_sys_setsockopt+0x62/0x70 net/socket.c:2167
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000006 -> 0x00000005

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1776 Comm: syz-executor.1 Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (445):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
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	2021/06/16 17:15	upstream	6b00bc639f1f	c06f97ad	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/05/28 19:21	upstream	5ff2756afde0	858ea628	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/05/12 14:03	upstream	88b06399c9c7	86294427	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/05/11 02:38	upstream	1140ab592e2e	ca873091	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/05/07 13:04	upstream	e48661230cc3	f6da8120	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/05/05 23:23	upstream	a79cdfba68a1	06c27ff5	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/05/02 16:27	upstream	17ae69aba89d	77e2b668	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/05/02 09:37	upstream	10a3efd0fee5	77e2b668	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/04/28 19:53	upstream	e359bce39d90	77e2b668	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/04/25 19:37	upstream	d2d09fbe33f8	2a82f1b3	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/04/20 20:59	upstream	7af08140979a	c0ced557	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/04/17 10:21	upstream	9cdbf6467424	7e2b734b	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/04/16 15:23	upstream	7e25f40eab52	7e2b734b	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/04/13 20:16	upstream	89698becf06d	a184b83e	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/04/11 04:52	upstream	52e44129fba5	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/04/08 21:53	upstream	3fb4f979b4fa	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/04/04 22:50	upstream	e49d033bddf5	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/04/01 19:12	upstream	ffd9fb546d49	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/31 21:28	upstream	d19cc4bfbff1	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/31 07:18	upstream	5e46d1b78a03	6a81331a	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/24 14:54	upstream	7acac4b3196c	607e3baf	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/22 03:46	upstream	5ee96fa9dd78	bea32f74	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/19 09:28	upstream	8b12a62a4e3e	2af9d324	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/18 20:40	upstream	bf152b0b41dc	380dcc3e	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/18 18:50	upstream	bf152b0b41dc	7216542e	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/18 08:45	upstream	6417f03132a6	7216542e	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/16 04:22	upstream	1a4431a5db2b	fdb2bb2c	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/15 14:35	upstream	1e28eed17697	fdb2bb2c	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/15 10:06	upstream	1e28eed17697	cc1cff8f	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/13 21:27	upstream	88fe49249c99	4a003785	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/11 21:07	upstream	28806e4d9b97	429d8a6b	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/10 16:17	upstream	05a59d79793d	764067f3	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/07 21:12	upstream	a38fd8748464	09fbf400	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/06 06:59	upstream	a38fd8748464	e4b4d570	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/05 17:57	upstream	280d542f6ffa	4a024a9b	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/04 23:27	upstream	cee407c5cc42	f89ed068	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/03/03 19:06	upstream	f69d02e37a85	06ed56cd	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/02/23 16:05	upstream	3b9cdafb5358	fcc6d71b	.config	log	report	info	KCSAN: data-race in pcpu_alloc / pcpu_block_update_hint_alloc
ci2-upstream-kcsan-gce	2021/02/22 09:09	upstream	31caf8b2a847	a659b3f1	.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