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BUG: KCSAN: data-race in drain_all_stock / drain_stock

write to 0xffff888237c22e70 of 4 bytes by task 5108 on cpu 0:
 drain_stock+0x48/0x100 mm/memcontrol.c:2163
 refill_stock mm/memcontrol.c:2205 [inline]
 try_charge_memcg+0x7f2/0xa00 mm/memcontrol.c:2669
 try_charge mm/memcontrol.c:2722 [inline]
 charge_memcg mm/memcontrol.c:6688 [inline]
 __mem_cgroup_charge+0x3d/0x170 mm/memcontrol.c:6724
 mem_cgroup_charge include/linux/memcontrol.h:694 [inline]
 __add_to_page_cache_locked+0x3bc/0x4f0 mm/filemap.c:892
 add_to_page_cache_lru+0xa0/0x1b0 mm/filemap.c:984
 pagecache_get_page+0x6ad/0x910 mm/filemap.c:1951
 find_or_create_page include/linux/pagemap.h:420 [inline]
 grow_dev_page fs/buffer.c:949 [inline]
 grow_buffers fs/buffer.c:1014 [inline]
 __getblk_slow fs/buffer.c:1041 [inline]
 __getblk_gfp+0x199/0x590 fs/buffer.c:1334
 sb_getblk include/linux/buffer_head.h:327 [inline]
 ext4_getblk+0x126/0x3e0 fs/ext4/inode.c:854
 ext4_bread+0x28/0x100 fs/ext4/inode.c:900
 ext4_append+0xd1/0x1c0 fs/ext4/namei.c:67
 ext4_init_new_dir+0x177/0x500 fs/ext4/namei.c:2893
 ext4_mkdir+0x329/0x760 fs/ext4/namei.c:2939
 vfs_mkdir+0x2c3/0x3e0 fs/namei.c:3885
 do_mkdirat+0x12e/0x2c0 fs/namei.c:3911
 __do_sys_mkdirat fs/namei.c:3926 [inline]
 __se_sys_mkdirat fs/namei.c:3924 [inline]
 __x64_sys_mkdirat+0x4c/0x60 fs/namei.c:3924
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237c22e70 of 4 bytes by task 3522 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: 0x00000002 -> 0x0000001f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3522 Comm: kworker/1:3 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
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