================================================================== BUG: KCSAN: data-race in compact_zone / compact_zone write to 0xffff88823fffad90 of 8 bytes by task 1576 on cpu 1: update_cached_migrate mm/compaction.c:434 [inline] isolate_migratepages mm/compaction.c:1927 [inline] compact_zone+0x1496/0x1d30 mm/compaction.c:2378 compact_zone_order mm/compaction.c:2521 [inline] try_to_compact_pages+0x317/0x850 mm/compaction.c:2587 __alloc_pages_direct_compact+0x61/0x330 mm/page_alloc.c:4198 __alloc_pages_slowpath+0x5d4/0xb70 mm/page_alloc.c:4861 __alloc_pages+0x25e/0x320 mm/page_alloc.c:5213 alloc_pages+0x21d/0x310 mm/mempolicy.c:2272 __get_free_pages+0x8/0x30 mm/page_alloc.c:5237 io_mem_alloc fs/io_uring.c:8084 [inline] io_allocate_scq_urings fs/io_uring.c:9489 [inline] io_uring_create+0x887/0x18d0 fs/io_uring.c:9627 io_uring_setup fs/io_uring.c:9716 [inline] __do_sys_io_uring_setup fs/io_uring.c:9722 [inline] __se_sys_io_uring_setup fs/io_uring.c:9719 [inline] __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:9719 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88823fffad90 of 8 bytes by task 1574 on cpu 0: update_cached_migrate mm/compaction.c:433 [inline] isolate_migratepages mm/compaction.c:1927 [inline] compact_zone+0x1472/0x1d30 mm/compaction.c:2378 compact_zone_order mm/compaction.c:2521 [inline] try_to_compact_pages+0x317/0x850 mm/compaction.c:2587 __alloc_pages_direct_compact+0x61/0x330 mm/page_alloc.c:4198 __alloc_pages_slowpath+0x5d4/0xb70 mm/page_alloc.c:4861 __alloc_pages+0x25e/0x320 mm/page_alloc.c:5213 alloc_pages+0x21d/0x310 mm/mempolicy.c:2272 __get_free_pages+0x8/0x30 mm/page_alloc.c:5237 io_mem_alloc fs/io_uring.c:8084 [inline] io_allocate_scq_urings fs/io_uring.c:9509 [inline] io_uring_create+0x9b9/0x18d0 fs/io_uring.c:9627 io_uring_setup fs/io_uring.c:9716 [inline] __do_sys_io_uring_setup fs/io_uring.c:9722 [inline] __se_sys_io_uring_setup fs/io_uring.c:9719 [inline] __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:9719 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1574 Comm: syz-executor.5 Not tainted 5.13.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================