KCSAN: data-race in compact_finished / compact

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in compact_finished / compact_zone (2) mm				1	671d	671d	0/26	auto-closed as invalid on 2022/07/29 03:22

================================================================== BUG: KCSAN: data-race in compact_finished / compact_zone write to 0xffff88823fffa8d0 of 8 bytes by task 19556 on cpu 1: reset_cached_positions mm/compaction.c:232 [inline] __compact_finished mm/compaction.c:2041 [inline] compact_finished+0x10e/0x560 mm/compaction.c:2146 compact_zone+0x186b/0x1ce0 mm/compaction.c:2358 compact_zone_order mm/compaction.c:2519 [inline] try_to_compact_pages+0x317/0x840 mm/compaction.c:2585 __alloc_pages_direct_compact+0x61/0x330 mm/page_alloc.c:4370 __alloc_pages_slowpath+0x29a/0xb90 mm/page_alloc.c:4954 __alloc_pages+0x25b/0x320 mm/page_alloc.c:5401 alloc_pages+0x2e8/0x340 mm/mempolicy.c:2244 __get_free_pages+0x8/0x30 mm/page_alloc.c:5425 io_mem_alloc fs/io_uring.c:8122 [inline] io_allocate_scq_urings fs/io_uring.c:9512 [inline] io_uring_create+0x904/0x1930 fs/io_uring.c:9648 io_uring_setup fs/io_uring.c:9738 [inline] __do_sys_io_uring_setup fs/io_uring.c:9744 [inline] __se_sys_io_uring_setup fs/io_uring.c:9741 [inline] __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:9741 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 0xffff88823fffa8d0 of 8 bytes by task 19552 on cpu 0: update_cached_migrate mm/compaction.c:433 [inline] isolate_migratepages mm/compaction.c:1925 [inline] compact_zone+0x1422/0x1ce0 mm/compaction.c:2376 compact_zone_order mm/compaction.c:2519 [inline] try_to_compact_pages+0x317/0x840 mm/compaction.c:2585 __alloc_pages_direct_compact+0x61/0x330 mm/page_alloc.c:4370 __alloc_pages_slowpath+0x29a/0xb90 mm/page_alloc.c:4954 __alloc_pages+0x25b/0x320 mm/page_alloc.c:5401 alloc_pages+0x2e8/0x340 mm/mempolicy.c:2244 __get_free_pages+0x8/0x30 mm/page_alloc.c:5425 io_mem_alloc fs/io_uring.c:8122 [inline] io_allocate_scq_urings fs/io_uring.c:9512 [inline] io_uring_create+0x904/0x1930 fs/io_uring.c:9648 io_uring_setup fs/io_uring.c:9738 [inline] __do_sys_io_uring_setup fs/io_uring.c:9744 [inline] __se_sys_io_uring_setup fs/io_uring.c:9741 [inline] __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:9741 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: 0x00000000000bc200 -> 0x0000000000001000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 19552 Comm: syz-executor.5 Tainted: G W 5.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================