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BUG: KCSAN: data-race in drain_all_stock / drain_stock.isra.0

write to 0xffff88812c02a100 of 8 bytes by task 8267 on cpu 0:
 drain_stock.isra.0+0x34/0x100 mm/memcontrol.c:2089
 refill_stock+0xa2/0x110 mm/memcontrol.c:2123
 try_charge+0xa60/0xbf0 mm/memcontrol.c:2534
 __memcg_kmem_charge_memcg+0x4a/0xe0 mm/memcontrol.c:2837
 memcg_kmem_charge_memcg include/linux/memcontrol.h:1409 [inline]
 memcg_charge_slab mm/slab.h:368 [inline]
 charge_slab_page mm/slab.h:489 [inline]
 kmem_getpages mm/slab.c:1373 [inline]
 cache_grow_begin+0x3bb/0x5c0 mm/slab.c:2600
 cache_alloc_refill mm/slab.c:2972 [inline]
 ____cache_alloc mm/slab.c:3055 [inline]
 ____cache_alloc mm/slab.c:3038 [inline]
 __do_cache_alloc mm/slab.c:3277 [inline]
 slab_alloc mm/slab.c:3312 [inline]
 kmem_cache_alloc+0x500/0x5d0 mm/slab.c:3484
 sk_prot_alloc+0x5a/0x240 net/core/sock.c:1597
 sk_alloc+0x51/0x5b0 net/core/sock.c:1657
 tipc_sk_create+0xc0/0x620 net/tipc/socket.c:470
 __sock_create+0x241/0x3a0 net/socket.c:1420
 sock_create_kern+0x44/0x60 net/socket.c:1489
 tipc_topsrv_create_listener net/tipc/topsrv.c:502 [inline]
 tipc_topsrv_start net/tipc/topsrv.c:666 [inline]
 tipc_topsrv_init_net+0x29e/0x510 net/tipc/topsrv.c:701
 ops_init+0x8c/0x240 net/core/net_namespace.c:137
 setup_net+0x191/0x4b0 net/core/net_namespace.c:335
 copy_net_ns+0x1e7/0x400 net/core/net_namespace.c:476
 create_new_namespaces+0x2e2/0x550 kernel/nsproxy.c:103
 copy_namespaces+0x153/0x1b0 kernel/nsproxy.c:161
 copy_process+0x2067/0x3c40 kernel/fork.c:2075
 _do_fork+0xfe/0x7a0 kernel/fork.c:2421
 __do_sys_clone kernel/fork.c:2576 [inline]
 __se_sys_clone kernel/fork.c:2557 [inline]
 __x64_sys_clone+0x130/0x170 kernel/fork.c:2557
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812c02a100 of 8 bytes by task 8108 on cpu 1:
 drain_all_stock mm/memcontrol.c:2158 [inline]
 drain_all_stock+0xd4/0x250 mm/memcontrol.c:2138
 mem_cgroup_css_offline+0x1bf/0x200 mm/memcontrol.c:5091
 offline_css kernel/cgroup/cgroup.c:5070 [inline]
 css_killed_work_fn+0xe8/0x260 kernel/cgroup/cgroup.c:5359
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264
 worker_thread+0xa0/0x800 kernel/workqueue.c:2410
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8108 Comm: kworker/1:4 Not tainted 5.5.0-rc1-syzkaller #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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