KCSAN: data-race in __percpu_counter_compare / percpu_counter_add

KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch (3)
Status: moderation: reported on 2020/12/07 11:37
Reported-by: syzbot+7ef7bc81239e25ce9e3d@syzkaller.appspotmail.com
First crash: 450d, last: 30d

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch				1	671d	671d	0/22	auto-closed as invalid on 2020/04/07 10:35
upstream	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch (2)				1	493d	493d	0/22	auto-closed as invalid on 2020/08/29 01:07

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch

write to 0xffff88810004b490 of 8 bytes by task 2961 on cpu 1:
 percpu_counter_add_batch+0x9c/0xd0 lib/percpu_counter.c:91
 percpu_counter_add include/linux/percpu_counter.h:56 [inline]
 shmem_inode_acct_block mm/shmem.c:224 [inline]
 shmem_alloc_and_acct_page mm/shmem.c:1600 [inline]
 shmem_getpage_gfp+0x8d9/0x13d0 mm/shmem.c:1901
 shmem_getpage mm/shmem.c:151 [inline]
 shmem_write_begin+0x7e/0x100 mm/shmem.c:2469
 generic_perform_write+0x1b8/0x3e0 mm/filemap.c:3770
 __generic_file_write_iter+0x174/0x310 mm/filemap.c:3897
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3929
 call_write_iter include/linux/fs.h:2163 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x7bc/0x900 fs/read_write.c:594
 ksys_write+0xd9/0x190 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:656
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810004b490 of 8 bytes by task 2957 on cpu 0:
 percpu_counter_read include/linux/percpu_counter.h:72 [inline]
 __percpu_counter_compare+0x28/0x1a0 lib/percpu_counter.c:225
 percpu_counter_compare include/linux/percpu_counter.h:51 [inline]
 shmem_inode_acct_block mm/shmem.c:221 [inline]
 shmem_alloc_and_acct_page mm/shmem.c:1600 [inline]
 shmem_getpage_gfp+0x868/0x13d0 mm/shmem.c:1901
 shmem_getpage mm/shmem.c:151 [inline]
 shmem_write_begin+0x7e/0x100 mm/shmem.c:2469
 generic_perform_write+0x1b8/0x3e0 mm/filemap.c:3770
 __generic_file_write_iter+0x174/0x310 mm/filemap.c:3897
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3929
 call_write_iter include/linux/fs.h:2163 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x7bc/0x900 fs/read_write.c:594
 ksys_write+0xd9/0x190 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:656
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000001c73 -> 0x0000000000001c93

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2957 Comm: syz-executor.1 Not tainted 5.15.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (108):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/10/30 05:37	upstream	a379fbbcb88b	098b5d53	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/10/26 16:56	upstream	3906fe9bb7f1	d50eb50a	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/10/22 06:23	upstream	2f111a6fd5b5	55f90bc6	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/10/19 12:52	upstream	519d81956ee2	24dc29db	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/09/21 08:24	upstream	e8f71f89236e	af796c18	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/09/15 01:15	upstream	1619b69edce1	07e953c1	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/09/11 04:35	upstream	e99f23c5bf59	3ce60af8	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/09/09 05:44	upstream	2d338201d531	e2776ee4	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/09/07 19:58	upstream	0bcfe68b8767	6ca60148	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/09/04 07:27	upstream	a9c9a6f741cd	d236a457	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/09/02 02:40	upstream	835d31d319d9	7eb7e152	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/08/31 02:41	upstream	8596e589b787	8f58a0ef	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/08/27 09:06	upstream	77dd11439b86	b318694d	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/08/20 12:17	upstream	f87d64319e6f	b599f2fc	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/08/19 17:24	upstream	d6d09a694205	e2da378b	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/08/19 03:09	upstream	d6d09a694205	a2fe1cb5	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/08/13 08:29	upstream	f8e6dfc64f61	3fd2ea69	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/08/08 03:46	upstream	85a90500f9a1	6972b106	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/08/07 07:39	upstream	894d6f401b21	6972b106	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/08/06 02:56	upstream	e04480920d1e	d2d6e680	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/07/28 22:35	upstream	4010a528219e	9a4781d4	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/07/28 05:25	upstream	7d549995d4e0	17d6ab15	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/07/22 06:06	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/07/17 19:05	upstream	d980cc0620ae	f115ae98	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/07/16 18:11	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/07/10 08:41	upstream	3dbdb38e2869	8f5a7b8c	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/07/05 21:23	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/07/01 11:09	upstream	dbe69e433722	658ebc66	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/06/27 23:56	upstream	b4b27b9eed8e	9d2ab5df	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/06/26 21:27	upstream	625acffd7ae2	9d2ab5df	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/06/24 03:43	upstream	7266f2030eb0	fe4ab389	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/06/19 14:29	upstream	9ed13a17e38e	aba2b2fb	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/06/13 03:30	upstream	8ecfa36cd4db	1ba81399	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/06/04 08:18	upstream	f88cd3fb9df2	0740de69	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/06/01 06:49	upstream	c2131f7e73c9	032639db	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/05/28 15:21	upstream	97e5bf604b7a	858ea628	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/05/27 06:45	upstream	7ac3a1c1ae51	858ea628	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/05/20 22:43	upstream	f01da525b3de	c560a65d	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/05/20 04:33	upstream	c3d0e3fd41b7	a343ba6b	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/05/15 15:15	upstream	25a1298726e9	93f844de	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/05/14 16:14	upstream	315d99318179	8bdd5343	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/05/11 01:05	upstream	6efb943b8616	ca873091	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/05/06 10:51	upstream	8404c9fbc84b	06c27ff5	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/05/01 01:16	upstream	65c61de9d090	77e2b668	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/04/26 17:49	upstream	9f4ad9e425a1	805b5003	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/04/25 01:19	upstream	2a1d7946fa53	17f0b706	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/04/22 15:49	upstream	16fc44d6387e	33c28d03	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/04/13 21:49	upstream	eebe426d32e1	a184b83e	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/04/12 09:56	upstream	d434405aaab7	6a81331a	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/01/14 22:11	upstream	65f0d2414b70	468dbb55	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 02:05	upstream	e87297fa080a	20366b87	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/05 16:17	upstream	c70672d8d316	abf9ba4f	.config	log	report