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BUG: KCSAN: data-race in drain_all_stock / obj_cgroup_uncharge_pages

write to 0xffff888237d282f8 of 4 bytes by task 1908 on cpu 1:
 refill_stock mm/memcontrol.c:2222 [inline]
 obj_cgroup_uncharge_pages+0x169/0x240 mm/memcontrol.c:2996
 __memcg_kmem_uncharge_page+0x4c/0xc0 mm/memcontrol.c:3070
 free_pages_prepare mm/page_alloc.c:1344 [inline]
 free_pcp_prepare+0x50/0x230 mm/page_alloc.c:1426
 free_unref_page_prepare mm/page_alloc.c:3325 [inline]
 free_unref_page+0x23/0xf0 mm/page_alloc.c:3404
 __vunmap+0x765/0x810 mm/vmalloc.c:2635
 __vfree mm/vmalloc.c:2683 [inline]
 vfree+0x80/0x100 mm/vmalloc.c:2714
 kvfree+0x22/0x40 mm/util.c:613
 bpf_map_area_free+0x11/0x20 kernel/bpf/syscall.c:346
 htab_free_elems kernel/bpf/hashtab.c:273 [inline]
 prealloc_destroy+0x143/0x1a0 kernel/bpf/hashtab.c:367
 htab_map_free+0x45/0x390 kernel/bpf/hashtab.c:1459
 bpf_map_free_deferred+0xb2/0x110 kernel/bpf/syscall.c:483
 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307
 worker_thread+0x616/0xa70 kernel/workqueue.c:2454
 kthread+0x1bf/0x1e0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

read to 0xffff888237d282f8 of 4 bytes by task 24736 on cpu 0:
 drain_all_stock+0xd5/0x4b0 mm/memcontrol.c:2255
 try_charge_memcg+0x69b/0xa50 mm/memcontrol.c:2607
 obj_cgroup_charge_pages+0xac/0x140 mm/memcontrol.c:3017
 __memcg_kmem_charge_page+0x1e3/0x2d0 mm/memcontrol.c:3044
 __alloc_pages+0x1b7/0x330 mm/page_alloc.c:5406
 __alloc_pages_node include/linux/gfp.h:572 [inline]
 alloc_pages_node include/linux/gfp.h:595 [inline]
 vm_area_alloc_pages mm/vmalloc.c:2904 [inline]
 __vmalloc_area_node+0x37b/0x8d0 mm/vmalloc.c:2962
 __vmalloc_node_range+0x191/0x1f0 mm/vmalloc.c:3107
 __bpf_map_area_alloc+0xfd/0x120 kernel/bpf/syscall.c:329
 bpf_map_area_alloc+0x18/0x20 kernel/bpf/syscall.c:336
 prealloc_init kernel/bpf/hashtab.c:314 [inline]
 htab_map_alloc+0x663/0xc80 kernel/bpf/hashtab.c:538
 find_and_alloc_map kernel/bpf/syscall.c:128 [inline]
 map_create kernel/bpf/syscall.c:865 [inline]
 __sys_bpf+0x4803/0xa3c0 kernel/bpf/syscall.c:4619
 __do_sys_bpf kernel/bpf/syscall.c:4741 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4739 [inline]
 __x64_sys_bpf+0x3f/0x50 kernel/bpf/syscall.c:4739
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000a -> 0x00000014

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24736 Comm: syz-executor.4 Not tainted 5.17.0-syzkaller-01442-gb47d5a4f6b8d-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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