KCSAN: data-race in compaction_alloc / compaction

KCSAN: data-race in compaction_alloc / compaction_alloc
Status: moderation: reported on 2020/12/07 12:08
Reported-by: syzbot+4267c44a7290ff820452@syzkaller.appspotmail.com
First crash: 52d, last: 10h50m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in compaction_alloc / compaction_alloc

write to 0xffff88813fffbc08 of 8 bytes by task 19783 on cpu 1:
 update_pageblock_skip mm/compaction.c:460 [inline]
 isolate_freepages mm/compaction.c:1571 [inline]
 compaction_alloc+0x12a2/0x1540 mm/compaction.c:1624
 unmap_and_move+0x113/0x690 mm/migrate.c:1189
 migrate_pages+0x2ad/0xee0 mm/migrate.c:1459
 compact_zone+0x1500/0x1d30 mm/compaction.c:2357
 compact_node+0xe4/0x1e0 mm/compaction.c:2633
 compact_nodes mm/compaction.c:2649 [inline]
 sysctl_compaction_handler+0x47/0x90 mm/compaction.c:2670
 proc_sys_call_handler+0x329/0x4e0 fs/proc/proc_sysctl.c:591
 proc_sys_write+0x1e/0x30 fs/proc/proc_sysctl.c:617
 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 0xffff88813fffbc08 of 8 bytes by task 19784 on cpu 0:
 update_pageblock_skip mm/compaction.c:459 [inline]
 isolate_freepages mm/compaction.c:1571 [inline]
 compaction_alloc+0x127e/0x1540 mm/compaction.c:1624
 unmap_and_move+0x113/0x690 mm/migrate.c:1189
 migrate_pages+0x2ad/0xee0 mm/migrate.c:1459
 compact_zone+0x1500/0x1d30 mm/compaction.c:2357
 compact_node+0xe4/0x1e0 mm/compaction.c:2633
 compact_nodes mm/compaction.c:2649 [inline]
 sysctl_compaction_handler+0x47/0x90 mm/compaction.c:2670
 proc_sys_call_handler+0x329/0x4e0 fs/proc/proc_sysctl.c:591
 proc_sys_write+0x1e/0x30 fs/proc/proc_sysctl.c:617
 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: 0 PID: 19784 Comm: syz-executor.3 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (29):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
ci2-upstream-kcsan-gce	2021/01/24 21:38	upstream	e6806137	52e37319	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/23 10:54	upstream	fe75a218	52e37319	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/22 08:24	upstream	83d09ad4	d4f4eca5	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/21 14:12	upstream	9791581c	d4f4eca5	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/21 05:31	upstream	75439bc4	d4f4eca5	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/20 12:04	upstream	45dfb8a5	d4f4eca5	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/19 01:18	upstream	1e2a199f	63631df1	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/18 14:37	upstream	19c329f6	63631df1	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/17 23:00	upstream	0da0a8a0	fd103621	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/17 12:25	upstream	0da0a8a0	813be542	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/16 07:08	upstream	1d94330a	65a7a854	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/15 03:25	upstream	14662050	468dbb55	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/14 06:15	upstream	65f0d241	269d24e8	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/12 20:26	upstream	e609571b	0cdd6185	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/12 01:46	upstream	a0d54b4f	2c1f2513	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/10 20:50	upstream	0653161f	2c1f2513	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/10 10:06	upstream	2ff90100	2c1f2513	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/05 21:39	upstream	6207214a	a0234d98	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2021/01/02 02:10	upstream	eda809ae	79264ae3	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/29 13:24	upstream	dea8dcf2	80910769	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/29 01:17	upstream	c76e02c5	8259d56c	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/28 07:39	upstream	5c8fe583	2242f77f	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/24 01:49	upstream	58cf05f5	c2c1d1dd	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/23 12:54	upstream	614cb589	c2c1d1dd	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/20 08:29	upstream	467f8165	04201c06	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/15 03:13	upstream	fab0fca1	97183ed7	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/09 02:27	upstream	7d8761ba	40cc414d	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/07 21:08	upstream	cd796ed3	51a9082e	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org
ci2-upstream-kcsan-gce	2020/12/03 11:09	upstream	3bb61aa6	8c9190ef	.config	log	report	info	akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org