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: 221d, last: 1d09h

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	442d	442d	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	264d	264d	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 0xffff8881000493d0 of 8 bytes by task 17555 on cpu 0:
 percpu_counter_add_batch+0xa4/0x110 lib/percpu_counter.c:91
 percpu_counter_add include/linux/percpu_counter.h:56 [inline]
 shmem_inode_acct_block mm/shmem.c:228 [inline]
 shmem_alloc_and_acct_page+0x1a5/0x640 mm/shmem.c:1582
 shmem_getpage_gfp+0x6c6/0x1980 mm/shmem.c:1895
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_write_begin+0x83/0x100 mm/shmem.c:2530
 generic_perform_write+0x196/0x3a0 mm/filemap.c:3575
 __generic_file_write_iter+0x15c/0x340 mm/filemap.c:3704
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3736
 call_write_iter include/linux/fs.h:1977 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6f9/0x7e0 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881000493d0 of 8 bytes by task 17532 on cpu 1:
 percpu_counter_read include/linux/percpu_counter.h:72 [inline]
 __percpu_counter_compare+0x28/0x1c0 lib/percpu_counter.c:225
 percpu_counter_compare include/linux/percpu_counter.h:51 [inline]
 shmem_inode_acct_block mm/shmem.c:225 [inline]
 shmem_alloc_and_acct_page+0x12c/0x640 mm/shmem.c:1582
 shmem_getpage_gfp+0x6c6/0x1980 mm/shmem.c:1895
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_write_begin+0x83/0x100 mm/shmem.c:2530
 generic_perform_write+0x196/0x3a0 mm/filemap.c:3575
 __generic_file_write_iter+0x15c/0x340 mm/filemap.c:3704
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3736
 call_write_iter include/linux/fs.h:1977 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6f9/0x7e0 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17532 Comm: syz-executor.3 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (61):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/13 21:49	upstream	eebe426d	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	d434405a	6a81331a	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/04/11 20:28	upstream	7d900724	6a81331a	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/04/08 09:32	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/31 06:22	upstream	5e46d1b7	6a81331a	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/22 00:06	upstream	5ee96fa9	4c9a64da	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/21 01:11	upstream	812da4d3	17810eae	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/18 21:12	upstream	bf152b0b	380dcc3e	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/18 19:47	upstream	bf152b0b	7216542e	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/18 09:05	upstream	6417f031	7216542e	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/17 23:18	upstream	1df27313	fdb2bb2c	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/14 13:18	upstream	88fe4924	4a003785	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/12 23:38	upstream	f296bfd5	429d8a6b	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/11 04:28	upstream	a74e6a01	c2ca1f2a	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/10 09:35	upstream	05a59d79	26967e35	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/07 11:46	upstream	a38fd874	c599ed12	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/03/07 03:50	upstream	a38fd874	e4b4d570	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/02/21 10:00	upstream	e767b353	3e5ed8b4	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/02/19 15:29	upstream	f40ddce8	f689d40a	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/02/19 07:26	upstream	f40ddce8	14052202	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/02/13 23:17	upstream	ac30d8ce	98682e5e	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/02/11 18:59	upstream	291009f6	a5f86b15	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/02/09 07:49	upstream	e0756cfc	2bd9619f	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/02/09 07:39	upstream	e0756cfc	2bd9619f	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/02/04 11:12	upstream	61556703	42b90a7c	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/02/04 07:37	upstream	3afe9076	624dad51	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/02/03 19:10	upstream	3aaf0a27	624dad51	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/02/02 04:57	upstream	88bb507a	e6b95f32	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/01/28 12:45	upstream	76c057c8	eefc07f2	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/01/27 18:22	upstream	2ab38c17	a57db36f	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/01/23 09:04	upstream	fe75a218	52e37319	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/01/23 06:24	upstream	83d09ad4	52e37319	.config	log	report	info	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch
ci2-upstream-kcsan-gce	2021/01/21 23:02	upstream	9791581c	d4f4eca5	.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	65f0d241	468dbb55	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/11 00:30	upstream	0653161f	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/09 23:02	upstream	2ff90100	2c1f2513	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/09 10:30	upstream	996e435f	a6c52263	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/07 16:48	upstream	71c061d2	c104d4a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/05 22:31	upstream	6207214a	b1c228e1	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/03 20:00	upstream	3516bd72	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/31 02:24	upstream	f6e1ea19	5cc121d6	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/28 01:44	upstream	f838f8d2	2242f77f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/27 11:46	upstream	f838f8d2	821e0b09	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/25 07:26	upstream	3913d00a	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/25 07:26	upstream	3913d00a	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/23 19:53	upstream	614cb589	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/23 00:59	upstream	614cb589	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/22 09:58	upstream	8653b778	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/09 07:53	upstream	7d8761ba	40cc414d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 02:05	upstream	e87297fa	20366b87	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/30 02:16	upstream	aae5ab85	a0092f9d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/09 17:12	upstream	f8394f23	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/07 19:01	upstream	659caaf6	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/25 17:48	upstream	d7691390	a1839e81	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 16:38	upstream	f804b315	be6b1582	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/20 07:20	upstream	bbe85027	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/19 16:22	upstream	7cf726a5	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/06 05:48	upstream	7575fdda	1880b4a9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/03 08:47	upstream	d3d45f82	2653fa43	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/26 18:04	upstream	7c7ec322	2d5ea0cb	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/05 16:17	upstream	c70672d8	abf9ba4f	.config	log	report