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BUG: KCSAN: data-race in kcompactd / try_to_compact_pages

read-write to 0xffff88823fffac30 of 4 bytes by task 7236 on cpu 1:
 compaction_deferred mm/compaction.c:150 [inline]
 try_to_compact_pages+0x1c4/0x930 mm/compaction.c:2858
 __alloc_pages_direct_compact+0x8e/0x3f0 mm/page_alloc.c:4168
 __alloc_pages_slowpath+0x334/0x690 mm/page_alloc.c:4946
 __alloc_frozen_pages_noprof+0x2ff/0x3d0 mm/page_alloc.c:5457
 alloc_pages_mpol+0xaf/0x1d0 mm/mempolicy.c:2511
 alloc_frozen_pages_noprof mm/mempolicy.c:2582 [inline]
 alloc_pages_noprof+0x94/0x140 mm/mempolicy.c:2602
 io_mem_alloc_compound io_uring/memmap.c:42 [inline]
 io_region_allocate_pages+0x12f/0x420 io_uring/memmap.c:189
 io_create_region+0x291/0x300 io_uring/memmap.c:251
 io_allocate_scq_urings+0x266/0x3a0 io_uring/io_uring.c:3014
 io_uring_create+0x2ec/0x4f0 io_uring/io_uring.c:3306
 io_uring_setup io_uring/io_uring.c:3376 [inline]
 __do_sys_io_uring_setup io_uring/io_uring.c:3410 [inline]
 __se_sys_io_uring_setup+0x1cb/0x1e0 io_uring/io_uring.c:3401
 __x64_sys_io_uring_setup+0x31/0x40 io_uring/io_uring.c:3401
 x64_sys_call+0x1fbf/0x2550 arch/x86/include/generated/asm/syscalls_64.h:426
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read-write to 0xffff88823fffac30 of 4 bytes by task 34 on cpu 0:
 compaction_deferred mm/compaction.c:150 [inline]
 kcompactd_do_work mm/compaction.c:3114 [inline]
 kcompactd+0x513/0xd40 mm/compaction.c:3220
 kthread+0x223/0x270 kernel/kthread.c:436
 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

value changed: 0x00000007 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 34 Comm: kcompactd0 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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