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BUG: KCSAN: data-race in drain_all_stock / obj_cgroup_uncharge_pages

write to 0xffff888237d282f8 of 4 bytes by interrupt on cpu 1:
 refill_stock mm/memcontrol.c:2222 [inline]
 obj_cgroup_uncharge_pages+0x169/0x240 mm/memcontrol.c:2996
 refill_obj_stock+0x15f/0x220 mm/memcontrol.c:3246
 obj_cgroup_uncharge+0xa/0x10 mm/memcontrol.c:3295
 memcg_slab_free_hook+0xe4/0x170 mm/slab.h:571
 ___cache_free+0x46/0x310 mm/slab.c:3456
 __cache_free mm/slab.c:3445 [inline]
 kmem_cache_free+0x65/0x110 mm/slab.c:3733
 radix_tree_node_rcu_free+0x52/0x60 lib/radix-tree.c:302
 rcu_do_batch kernel/rcu/tree.c:2527 [inline]
 rcu_core+0x886/0xee0 kernel/rcu/tree.c:2778
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2795
 __do_softirq+0x158/0x2de kernel/softirq.c:558
 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:921
 smpboot_thread_fn+0x308/0x4a0 kernel/smpboot.c:164
 kthread+0x1bf/0x1e0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

read to 0xffff888237d282f8 of 4 bytes by task 1915 on cpu 0:
 drain_all_stock+0xd5/0x4b0 mm/memcontrol.c:2255
 mem_cgroup_css_offline+0x79/0x210 mm/memcontrol.c:5287
 offline_css kernel/cgroup/cgroup.c:5277 [inline]
 css_killed_work_fn+0x8d/0x210 kernel/cgroup/cgroup.c:5554
 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

value changed: 0x00000002 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1915 Comm: kworker/0:6 Not tainted 5.17.0-rc6-syzkaller-00054-gfb184c4af9b9-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: cgroup_destroy css_killed_work_fn
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