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: 325d, last: 8h04m

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	547d	547d	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	368d	368d	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 0xffff88810004b3d0 of 8 bytes by task 23181 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:228 [inline]
 shmem_alloc_and_acct_page mm/shmem.c:1582 [inline]
 shmem_getpage_gfp+0x8be/0x13d0 mm/shmem.c:1917
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_write_begin+0x7e/0x100 mm/shmem.c:2494
 generic_perform_write+0x196/0x3c0 mm/filemap.c:3656
 __generic_file_write_iter+0x161/0x300 mm/filemap.c:3783
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3815
 call_write_iter include/linux/fs.h:2114 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x69d/0x770 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_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 0xffff88810004b3d0 of 8 bytes by task 23183 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:225 [inline]
 shmem_alloc_and_acct_page mm/shmem.c:1582 [inline]
 shmem_getpage_gfp+0x84d/0x13d0 mm/shmem.c:1917
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_write_begin+0x7e/0x100 mm/shmem.c:2494
 generic_perform_write+0x196/0x3c0 mm/filemap.c:3656
 __generic_file_write_iter+0x161/0x300 mm/filemap.c:3783
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3815
 call_write_iter include/linux/fs.h:2114 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x69d/0x770 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_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: 0x0000000000017be7 -> 0x0000000000017c07

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23183 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 (87):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
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	2021/04/11 20:28	upstream	7d900724913c	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	454859c552da	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	5e46d1b78a03	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	5ee96fa9dd78	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	812da4d39463	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	bf152b0b41dc	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	bf152b0b41dc	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	6417f03132a6	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	1df27313f50a	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	88fe49249c99	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	f296bfd5cd04	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	a74e6a014c9d	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	05a59d79793d	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	a38fd8748464	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	a38fd8748464	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	e767b3530acb	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	f40ddce88593	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	f40ddce88593	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	ac30d8ce28d6	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	291009f656e8	a5f86b15	.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	2020/12/25 07:26	upstream	3913d00ac51a	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/25 07:26	upstream	3913d00ac51a	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/23 19:53	upstream	614cb5894306	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/23 00:59	upstream	614cb5894306	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/22 09:58	upstream	8653b778e454	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/09 07:53	upstream	7d8761ba27fc	40cc414d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 02:05	upstream	e87297fa080a	20366b87	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/30 02:16	upstream	aae5ab854e38	a0092f9d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/09 17:12	upstream	f8394f232b1e	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/07 19:01	upstream	659caaf65dc9	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/25 17:48	upstream	d76913908102	a1839e81	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 16:38	upstream	f804b3159482	be6b1582	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/20 07:20	upstream	bbe85027ce80	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/19 16:22	upstream	7cf726a59435	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/06 05:48	upstream	7575fdda569b	1880b4a9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/03 08:47	upstream	d3d45f8220d6	2653fa43	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/26 18:04	upstream	7c7ec3226f5f	2d5ea0cb	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/05 16:17	upstream	c70672d8d316	abf9ba4f	.config	log	report