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BUG: KCSAN: data-race in compact_zone / compact_zone

write to 0xffff88823fffad90 of 8 bytes by task 4491 on cpu 0:
 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:8089 [inline]
 io_allocate_scq_urings fs/io_uring.c:9506 [inline]
 io_uring_create+0x887/0x18d0 fs/io_uring.c:9644
 io_uring_setup fs/io_uring.c:9734 [inline]
 __do_sys_io_uring_setup fs/io_uring.c:9740 [inline]
 __se_sys_io_uring_setup fs/io_uring.c:9737 [inline]
 __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:9737
 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 4490 on cpu 1:
 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:8089 [inline]
 io_allocate_scq_urings fs/io_uring.c:9526 [inline]
 io_uring_create+0x9b9/0x18d0 fs/io_uring.c:9644
 io_uring_setup fs/io_uring.c:9734 [inline]
 __do_sys_io_uring_setup fs/io_uring.c:9740 [inline]
 __se_sys_io_uring_setup fs/io_uring.c:9737 [inline]
 __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:9737
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x000000000014c800 -> 0x000000000015c000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4490 Comm: syz-executor.5 Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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