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BUG: KCSAN: data-race in page_counter_try_charge / page_counter_try_charge

write to 0xffff88821b672150 of 8 bytes by task 16063 on cpu 0:
 page_counter_try_charge+0x77/0x170 mm/page_counter.c:139
 try_charge+0x17f/0xbe0 mm/memcontrol.c:2405
 __memcg_kmem_charge_memcg+0x49/0xe0 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+0x39f/0x590 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+0x50c/0x5e0 mm/slab.c:3488
 sk_prot_alloc+0x54/0x230 net/core/sock.c:1597
 sk_alloc+0x50/0x580 net/core/sock.c:1657
 inet6_create net/ipv6/af_inet6.c:180 [inline]
 inet6_create+0x24e/0x820 net/ipv6/af_inet6.c:107
 __sock_create+0x243/0x3a0 net/socket.c:1433
 sock_create net/socket.c:1484 [inline]
 __sys_socket+0x94/0x170 net/socket.c:1526
 __do_sys_socket net/socket.c:1535 [inline]
 __se_sys_socket net/socket.c:1533 [inline]
 __x64_sys_socket+0x47/0x60 net/socket.c:1533
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88821b672150 of 8 bytes by task 16062 on cpu 1:
 page_counter_try_charge+0x56/0x170 mm/page_counter.c:138
 try_charge+0x17f/0xbe0 mm/memcontrol.c:2405
 mem_cgroup_try_charge+0xd7/0x260 mm/memcontrol.c:6367
 __add_to_page_cache_locked+0x16c/0x770 mm/filemap.c:844
 add_to_page_cache_lru+0xc7/0x260 mm/filemap.c:921
 ext4_mpage_readpages+0x310/0x1400 fs/ext4/readpage.c:259
 ext4_readpages+0x8e/0xb0 fs/ext4/inode.c:3245
 read_pages+0xa2/0x2d0 mm/readahead.c:126
 __do_page_cache_readahead+0x358/0x380 mm/readahead.c:212
 ra_submit mm/internal.h:62 [inline]
 ondemand_readahead+0x369/0x730 mm/readahead.c:492
 page_cache_async_readahead+0x237/0x260 mm/readahead.c:574
 generic_file_buffered_read mm/filemap.c:2037 [inline]
 generic_file_read_iter+0xff2/0x1490 mm/filemap.c:2302
 ext4_file_read_iter fs/ext4/file.c:131 [inline]
 ext4_file_read_iter+0x103/0x360 fs/ext4/file.c:114
 call_read_iter include/linux/fs.h:1895 [inline]
 new_sync_read+0x306/0x450 fs/read_write.c:414
 __vfs_read+0x9e/0xb0 fs/read_write.c:427
 vfs_read fs/read_write.c:461 [inline]
 vfs_read+0x13e/0x2b0 fs/read_write.c:446
 ksys_read+0xc5/0x1a0 fs/read_write.c:587
 __do_sys_read fs/read_write.c:597 [inline]
 __se_sys_read fs/read_write.c:595 [inline]
 __x64_sys_read+0x49/0x60 fs/read_write.c:595
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16062 Comm: syz-executor.2 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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