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BUG: KCSAN: data-race in page_counter_try_charge / page_counter_try_charge

read to 0xffff88812b33b150 of 8 bytes by task 7431 on cpu 0:
 page_counter_try_charge+0x58/0x170 mm/page_counter.c:138
 try_charge+0x182/0xbc0 mm/memcontrol.c:2522
 mem_cgroup_try_charge+0xd2/0x260 mm/memcontrol.c:6498
 mem_cgroup_try_charge_delay+0x3a/0x80 mm/memcontrol.c:6513
 wp_page_copy+0x322/0x1160 mm/memory.c:2333
 do_wp_page+0x192/0x11f0 mm/memory.c:2628
 handle_pte_fault mm/memory.c:3865 [inline]
 __handle_mm_fault+0x1c07/0x2cb0 mm/memory.c:3973
 handle_mm_fault+0x21b/0x530 mm/memory.c:4010
 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline]
 __do_page_fault+0x3fb/0x9e0 arch/x86/mm/fault.c:1506
 do_page_fault+0x54/0x233 arch/x86/mm/fault.c:1530
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1202
 copy_user_enhanced_fast_string+0xe/0x30 arch/x86/lib/copy_user_64.S:204
 copy_page_to_iter_iovec lib/iov_iter.c:211 [inline]
 copy_page_to_iter+0x254/0x8b0 lib/iov_iter.c:900
 pipe_to_user+0x71/0xc0 fs/splice.c:1248

write to 0xffff88812b33b150 of 8 bytes by task 7410 on cpu 1:
 page_counter_try_charge+0x7e/0x170 mm/page_counter.c:139
 try_charge+0x182/0xbc0 mm/memcontrol.c:2522
 mem_cgroup_try_charge+0xd2/0x260 mm/memcontrol.c:6498
 __add_to_page_cache_locked+0x163/0x780 mm/filemap.c:865
 add_to_page_cache_lru+0xe2/0x2d0 mm/filemap.c:942
 pagecache_get_page+0x2ab/0x760 mm/filemap.c:1681
 grab_cache_page_write_begin+0x5d/0x90 mm/filemap.c:3254
 ext4_da_write_begin+0x175/0x7e0 fs/ext4/inode.c:3063
 generic_perform_write+0x136/0x320 mm/filemap.c:3304
 __generic_file_write_iter+0x251/0x380 mm/filemap.c:3433
 ext4_file_write_iter+0x1bd/0xa00 fs/ext4/file.c:268
 call_write_iter include/linux/fs.h:1895 [inline]
 new_sync_write+0x388/0x4a0 fs/read_write.c:483
 __vfs_write+0xb1/0xc0 fs/read_write.c:496

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7410 Comm: syz-executor.3 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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