================================================================== BUG: KCSAN: data-race in compact_zone / compact_zone write to 0xffff88823fffa8d0 of 8 bytes by task 26839 on cpu 1: update_cached_migrate mm/compaction.c:434 [inline] isolate_migratepages mm/compaction.c:1925 [inline] compact_zone+0x1446/0x1ce0 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:4373 __alloc_pages_slowpath+0x29a/0xb90 mm/page_alloc.c:4957 __alloc_pages+0x25b/0x320 mm/page_alloc.c:5404 alloc_pages+0x2e8/0x340 mm/mempolicy.c:2244 __get_free_pages+0x8/0x30 mm/page_alloc.c:5428 io_mem_alloc fs/io_uring.c:8145 [inline] io_allocate_scq_urings fs/io_uring.c:9535 [inline] io_uring_create+0x904/0x1940 fs/io_uring.c:9671 io_uring_setup fs/io_uring.c:9761 [inline] __do_sys_io_uring_setup fs/io_uring.c:9767 [inline] __se_sys_io_uring_setup fs/io_uring.c:9764 [inline] __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:9764 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 26843 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:4373 __alloc_pages_slowpath+0x5d4/0xb90 mm/page_alloc.c:5039 __alloc_pages+0x25b/0x320 mm/page_alloc.c:5404 alloc_pages+0x2e8/0x340 mm/mempolicy.c:2244 __get_free_pages+0x8/0x30 mm/page_alloc.c:5428 io_mem_alloc fs/io_uring.c:8145 [inline] io_allocate_scq_urings fs/io_uring.c:9535 [inline] io_uring_create+0x904/0x1940 fs/io_uring.c:9671 io_uring_setup fs/io_uring.c:9761 [inline] __do_sys_io_uring_setup fs/io_uring.c:9767 [inline] __se_sys_io_uring_setup fs/io_uring.c:9764 [inline] __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:9764 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: 0x000000000007a000 -> 0x000000000007c400 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 26843 Comm: syz-executor.0 Not tainted 5.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================