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BUG: KCSAN: data-race in compact_zone / compact_zone

write to 0xffff88823fffad90 of 8 bytes by task 4098 on cpu 0:
 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:4372
 __alloc_pages_slowpath+0x29a/0xb90 mm/page_alloc.c:4956
 __alloc_pages+0x25b/0x320 mm/page_alloc.c:5403
 alloc_pages+0x382/0x3d0
 __get_free_pages+0x8/0x30 mm/page_alloc.c:5427
 io_mem_alloc fs/io_uring.c:8648 [inline]
 io_allocate_scq_urings fs/io_uring.c:10045 [inline]
 io_uring_create+0x944/0x1980 fs/io_uring.c:10181
 io_uring_setup fs/io_uring.c:10271 [inline]
 __do_sys_io_uring_setup fs/io_uring.c:10277 [inline]
 __se_sys_io_uring_setup fs/io_uring.c:10274 [inline]
 __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:10274
 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 0xffff88823fffad90 of 8 bytes by task 4099 on cpu 1:
 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:4372
 __alloc_pages_slowpath+0x29a/0xb90 mm/page_alloc.c:4956
 __alloc_pages+0x25b/0x320 mm/page_alloc.c:5403
 alloc_pages+0x382/0x3d0
 __get_free_pages+0x8/0x30 mm/page_alloc.c:5427
 io_mem_alloc fs/io_uring.c:8648 [inline]
 io_allocate_scq_urings fs/io_uring.c:10063 [inline]
 io_uring_create+0xa37/0x1980 fs/io_uring.c:10181
 io_uring_setup fs/io_uring.c:10271 [inline]
 __do_sys_io_uring_setup fs/io_uring.c:10277 [inline]
 __se_sys_io_uring_setup fs/io_uring.c:10274 [inline]
 __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:10274
 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: 0x000000000019ce00 -> 0x00000000001b8c00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4099 Comm: syz-executor.3 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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