KCSAN: data-race in compact_zone / compact

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in compact_zone / compact_zone (6) mm	6	2	695d	714d	0/29	auto-obsoleted due to no activity on 2024/01/30 17:49
upstream	KCSAN: data-race in compact_zone / compact_zone (7) mm	6	1	319d	319d	0/29	auto-obsoleted due to no activity on 2025/03/02 10:41
upstream	KCSAN: data-race in compact_zone / compact_zone (3) mm	6	2	1846d	1872d	0/29	auto-closed as invalid on 2020/12/05 18:21
upstream	KCSAN: data-race in compact_zone / compact_zone mm	6	3	2025d	2037d	0/29	auto-closed as invalid on 2020/06/18 13:23
upstream	KCSAN: data-race in compact_zone / compact_zone (5) mm	6	58	1500d	1529d	0/29	auto-closed as invalid on 2021/11/17 00:44
upstream	KCSAN: data-race in compact_zone / compact_zone (8) mm	6	2	7d10h	58d	0/29	moderation: reported on 2025/09/23 23:39
upstream	KCSAN: data-race in compact_zone / compact_zone (4) mm	6	4	1747d	1766d	0/29	auto-closed as invalid on 2021/03/15 05:37

================================================================== BUG: KCSAN: data-race in compact_zone / compact_zone write to 0xffff88812fffbc10 of 8 bytes by task 12360 on cpu 1: update_cached_migrate mm/compaction.c:418 [inline] isolate_migratepages mm/compaction.c:1826 [inline] compact_zone+0x13f8/0x1de0 mm/compaction.c:2183 compact_zone_order mm/compaction.c:2327 [inline] try_to_compact_pages+0x28c/0x5b0 mm/compaction.c:2385 __alloc_pages_direct_compact+0x89/0x170 mm/page_alloc.c:4000 __alloc_pages_slowpath+0x596/0x970 mm/page_alloc.c:4656 __alloc_pages_nodemask+0x235/0x390 mm/page_alloc.c:4863 __alloc_pages include/linux/gfp.h:509 [inline] __alloc_pages_node include/linux/gfp.h:522 [inline] alloc_pages_node include/linux/gfp.h:536 [inline] alloc_new_node_page+0x129/0x160 mm/mempolicy.c:1077 unmap_and_move+0x114/0x800 mm/migrate.c:1192 migrate_pages+0x1ad/0xa30 mm/migrate.c:1444 do_move_pages_to_node mm/migrate.c:1523 [inline] move_pages_and_store_status mm/migrate.c:1613 [inline] do_pages_move mm/migrate.c:1709 [inline] kernel_move_pages+0xa41/0xc00 mm/migrate.c:1842 __do_sys_move_pages mm/migrate.c:1860 [inline] __se_sys_move_pages mm/migrate.c:1855 [inline] __x64_sys_move_pages+0x74/0x90 mm/migrate.c:1855 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812fffbc10 of 8 bytes by task 12358 on cpu 0: update_cached_migrate mm/compaction.c:417 [inline] isolate_migratepages mm/compaction.c:1826 [inline] compact_zone+0x13d3/0x1de0 mm/compaction.c:2183 compact_zone_order mm/compaction.c:2327 [inline] try_to_compact_pages+0x28c/0x5b0 mm/compaction.c:2385 __alloc_pages_direct_compact+0x89/0x170 mm/page_alloc.c:4000 __alloc_pages_slowpath+0x596/0x970 mm/page_alloc.c:4656 __alloc_pages_nodemask+0x235/0x390 mm/page_alloc.c:4863 __alloc_pages include/linux/gfp.h:509 [inline] __alloc_pages_node include/linux/gfp.h:522 [inline] alloc_pages_node include/linux/gfp.h:536 [inline] alloc_new_node_page+0x129/0x160 mm/mempolicy.c:1077 unmap_and_move+0x114/0x800 mm/migrate.c:1192 migrate_pages+0x1ad/0xa30 mm/migrate.c:1444 do_move_pages_to_node mm/migrate.c:1523 [inline] move_pages_and_store_status mm/migrate.c:1613 [inline] do_pages_move mm/migrate.c:1709 [inline] kernel_move_pages+0xa41/0xc00 mm/migrate.c:1842 __do_sys_move_pages mm/migrate.c:1860 [inline] __se_sys_move_pages mm/migrate.c:1855 [inline] __x64_sys_move_pages+0x74/0x90 mm/migrate.c:1855 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 12358 Comm: syz-executor.4 Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================