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BUG: KCSAN: data-race in __refill_stock / drain_all_stock

read-write to 0xffff888237d2a3c0 of 4 bytes by task 11785 on cpu 1:
 __refill_stock+0x7f/0xb0 mm/memcontrol.c:2364
 refill_stock mm/memcontrol.c:2375 [inline]
 obj_cgroup_uncharge_pages+0xfb/0x1a0 mm/memcontrol.c:3234
 __memcg_kmem_uncharge_page+0x53/0x100 mm/memcontrol.c:3307
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_page_prepare+0x7c/0x2a0 mm/page_alloc.c:2347
 free_unref_page+0x34/0x170 mm/page_alloc.c:2487
 bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:143 [inline]
 bpf_ringbuf_alloc+0x2b0/0x2f0 kernel/bpf/ringbuf.c:170
 ringbuf_map_alloc+0x167/0x1d0 kernel/bpf/ringbuf.c:204
 map_create+0x713/0xa40 kernel/bpf/syscall.c:1210
 __sys_bpf+0x62a/0x780 kernel/bpf/syscall.c:5365
 __do_sys_bpf kernel/bpf/syscall.c:5487 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5485 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5485
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888237d2a3c0 of 4 bytes by task 11800 on cpu 0:
 drain_all_stock+0xd3/0x2d0 mm/memcontrol.c:2405
 try_charge_memcg+0x6c5/0xd30 mm/memcontrol.c:2750
 obj_cgroup_charge_pages+0xab/0x130 mm/memcontrol.c:3255
 __memcg_kmem_charge_page+0x9c/0x170 mm/memcontrol.c:3281
 __alloc_pages+0x1bb/0x340 mm/page_alloc.c:4585
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:122 [inline]
 bpf_ringbuf_alloc+0xba/0x2f0 kernel/bpf/ringbuf.c:170
 ringbuf_map_alloc+0x167/0x1d0 kernel/bpf/ringbuf.c:204
 map_create+0x713/0xa40 kernel/bpf/syscall.c:1210
 __sys_bpf+0x62a/0x780 kernel/bpf/syscall.c:5365
 __do_sys_bpf kernel/bpf/syscall.c:5487 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5485 [inline]
 __x64_sys_bpf+0x43/0x50 kernel/bpf/syscall.c:5485
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000e -> 0x00000009

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11800 Comm: syz-executor.0 Not tainted 6.7.0-rc4-syzkaller-00039-g9ace34a8e446 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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