==================================================================
BUG: KCSAN: data-race in drain_all_stock / drain_stock

write to 0xffff888237c22e70 of 4 bytes by interrupt on cpu 0:
 drain_stock+0x48/0x100 mm/memcontrol.c:2163
 refill_stock mm/memcontrol.c:2205 [inline]
 obj_cgroup_uncharge_pages+0x72/0x1a0 mm/memcontrol.c:2938
 refill_obj_stock+0x123/0x1b0 mm/memcontrol.c:3201
 obj_cgroup_uncharge+0xa/0x10 mm/memcontrol.c:3250
 memcg_slab_free_hook+0xd9/0x150 mm/slab.h:364
 ___cache_free+0x3c/0x300 mm/slab.c:3464
 __cache_free mm/slab.c:3453 [inline]
 kmem_cache_free+0x5e/0xe0 mm/slab.c:3740
 file_free_rcu+0x73/0x80 fs/file_table.c:50
 rcu_do_batch kernel/rcu/tree.c:2508 [inline]
 rcu_core+0xbd5/0xd90 kernel/rcu/tree.c:2743
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2756
 __do_softirq+0x12c/0x26e kernel/softirq.c:558
 run_ksoftirqd+0x13/0x20 kernel/softirq.c:920
 smpboot_thread_fn+0x22f/0x330 kernel/smpboot.c:164
 kthread+0x262/0x280 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30

read to 0xffff888237c22e70 of 4 bytes by task 17 on cpu 1:
 drain_all_stock+0xc0/0x460 mm/memcontrol.c:2242
 mem_cgroup_css_offline+0x96/0x220 mm/memcontrol.c:5280
 offline_css kernel/cgroup/cgroup.c:5215 [inline]
 css_killed_work_fn+0x8d/0x210 kernel/cgroup/cgroup.c:5492
 process_one_work+0x402/0x910 kernel/workqueue.c:2297
 worker_thread+0x636/0xae0 kernel/workqueue.c:2444
 kthread+0x262/0x280 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.15.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: cgroup_destroy css_killed_work_fn
==================================================================