syzbot

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BUG: KCSAN: data-race in compact_zone / compact_zone

write to 0xffff88813fffc290 of 8 bytes by task 15304 on cpu 1:
 update_cached_migrate mm/compaction.c:435 [inline]
 isolate_migratepages mm/compaction.c:1888 [inline]
 compact_zone+0x1415/0x1d60 mm/compaction.c:2335
 compact_zone_order mm/compaction.c:2478 [inline]
 try_to_compact_pages+0x317/0x820 mm/compaction.c:2536
 __alloc_pages_direct_compact+0x89/0x350 mm/page_alloc.c:4149
 __alloc_pages_slowpath+0x5b1/0x9c0 mm/page_alloc.c:4810
 __alloc_pages_nodemask+0x269/0x350 mm/page_alloc.c:5014
 alloc_pages_current+0x21d/0x310 mm/mempolicy.c:2267
 alloc_pages include/linux/gfp.h:547 [inline]
 __get_free_pages+0x8/0x30 mm/page_alloc.c:5038
 io_mem_alloc fs/io_uring.c:8325 [inline]
 io_allocate_scq_urings fs/io_uring.c:9530 [inline]
 io_uring_create+0xf05/0x2170 fs/io_uring.c:9721
 io_uring_setup fs/io_uring.c:9810 [inline]
 __do_sys_io_uring_setup fs/io_uring.c:9816 [inline]
 __se_sys_io_uring_setup fs/io_uring.c:9813 [inline]
 __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:9813
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88813fffc290 of 8 bytes by task 15299 on cpu 0:
 update_cached_migrate mm/compaction.c:434 [inline]
 isolate_migratepages mm/compaction.c:1888 [inline]
 compact_zone+0x13f0/0x1d60 mm/compaction.c:2335
 compact_zone_order mm/compaction.c:2478 [inline]
 try_to_compact_pages+0x317/0x820 mm/compaction.c:2536
 __alloc_pages_direct_compact+0x89/0x350 mm/page_alloc.c:4149
 __alloc_pages_slowpath+0x2b5/0x9c0 mm/page_alloc.c:4728
 __alloc_pages_nodemask+0x269/0x350 mm/page_alloc.c:5014
 alloc_pages_current+0x21d/0x310 mm/mempolicy.c:2267
 alloc_pages include/linux/gfp.h:547 [inline]
 __get_free_pages+0x8/0x30 mm/page_alloc.c:5038
 io_mem_alloc fs/io_uring.c:8325 [inline]
 io_allocate_scq_urings fs/io_uring.c:9550 [inline]
 io_uring_create+0x1065/0x2170 fs/io_uring.c:9721
 io_uring_setup fs/io_uring.c:9810 [inline]
 __do_sys_io_uring_setup fs/io_uring.c:9816 [inline]
 __se_sys_io_uring_setup fs/io_uring.c:9813 [inline]
 __x64_sys_io_uring_setup+0xe1/0x120 fs/io_uring.c:9813
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15299 Comm: syz-executor.3 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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