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: 141d, last: 1d22h

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	362d	362d	0/17	auto-closed as invalid on 2020/04/07 10:35
upstream	KCSAN: data-race in __percpu_counter_compare / percpu_counter_add_batch (2)				1	184d	184d	0/17	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

read-write to 0xffff888100049490 of 8 bytes by task 11587 on cpu 0:
 percpu_counter_add_batch+0x9b/0x100 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+0x1a5/0x650 mm/shmem.c:1584
 shmem_getpage_gfp+0x6b3/0x1960 mm/shmem.c:1893
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_write_begin+0x80/0x100 mm/shmem.c:2528
 generic_perform_write+0x196/0x3a0 mm/filemap.c:3408
 __generic_file_write_iter+0x15c/0x330 mm/filemap.c:3537
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3569
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6d4/0x7c0 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+0x44/0xa9

read to 0xffff888100049490 of 8 bytes by task 11589 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/0x650 mm/shmem.c:1584
 shmem_getpage_gfp+0x6b3/0x1960 mm/shmem.c:1893
 shmem_getpage mm/shmem.c:155 [inline]
 shmem_write_begin+0x80/0x100 mm/shmem.c:2528
 generic_perform_write+0x196/0x3a0 mm/filemap.c:3408
 __generic_file_write_iter+0x15c/0x330 mm/filemap.c:3537
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3569
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6d4/0x7c0 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+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11589 Comm: syz-executor.5 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (31):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
ci2-upstream-kcsan-gce	2021/01/23 09:04	upstream	fe75a218	52e37319	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/23 06:24	upstream	83d09ad4	52e37319	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/21 23:02	upstream	9791581c	d4f4eca5	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/14 22:11	upstream	65f0d241	468dbb55	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/11 00:30	upstream	0653161f	2c1f2513	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/09 23:02	upstream	2ff90100	2c1f2513	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/09 10:30	upstream	996e435f	a6c52263	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/07 16:48	upstream	71c061d2	c104d4a3	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/05 22:31	upstream	6207214a	b1c228e1	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/03 20:00	upstream	3516bd72	79264ae3	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/31 02:24	upstream	f6e1ea19	5cc121d6	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/28 01:44	upstream	f838f8d2	2242f77f	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/27 11:46	upstream	f838f8d2	821e0b09	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/25 07:26	upstream	3913d00a	c2c1d1dd	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/25 07:26	upstream	3913d00a	c2c1d1dd	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/23 19:53	upstream	614cb589	c2c1d1dd	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/23 00:59	upstream	614cb589	04201c06	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/22 09:58	upstream	8653b778	04201c06	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/09 07:53	upstream	7d8761ba	40cc414d	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/05 02:05	upstream	e87297fa	20366b87	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/11/30 02:16	upstream	aae5ab85	a0092f9d	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/11/09 17:12	upstream	f8394f23	cba33199	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/11/07 19:01	upstream	659caaf6	cba33199	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/25 17:48	upstream	d7691390	a1839e81	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/22 16:38	upstream	f804b315	be6b1582	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/20 07:20	upstream	bbe85027	ff4a3345	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/19 16:22	upstream	7cf726a5	ff4a3345	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/06 05:48	upstream	7575fdda	1880b4a9	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/10/03 08:47	upstream	d3d45f82	2653fa43	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/26 18:04	upstream	7c7ec322	2d5ea0cb	.config	log	report	info	akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/09/05 16:17	upstream	c70672d8	abf9ba4f	.config	log	report		akpm@linux-foundation.org, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org