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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 11027 on cpu 0:
 page_counter_try_charge+0x7e/0x170 mm/page_counter.c:139
 try_charge+0x185/0xbf0 mm/memcontrol.c:2405
 mem_cgroup_try_charge+0xd2/0x260 mm/memcontrol.c:6404
 __add_to_page_cache_locked+0x163/0x780 mm/filemap.c:866
 add_to_page_cache_lru+0xc4/0x260 mm/filemap.c:943
 pagecache_get_page+0x2ac/0x6f0 mm/filemap.c:1682
 grab_cache_page_write_begin+0x5d/0x90 mm/filemap.c:3259
 ext4_da_write_begin+0x1a3/0x840 fs/ext4/inode.c:2965
 generic_perform_write+0x136/0x320 mm/filemap.c:3309
 ext4_buffered_write_iter+0x143/0x290 fs/ext4/file.c:252
 ext4_file_write_iter+0xf4/0xd40 fs/ext4/file.c:547
 call_write_iter include/linux/fs.h:1902 [inline]
 new_sync_write+0x388/0x4a0 fs/read_write.c:483
 __vfs_write+0xb1/0xc0 fs/read_write.c:496
 vfs_write fs/read_write.c:558 [inline]
 vfs_write+0x18a/0x390 fs/read_write.c:542
 ksys_write+0xd5/0x1b0 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write fs/read_write.c:620 [inline]
 __x64_sys_write+0x4c/0x60 fs/read_write.c:620
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88821b672150 of 8 bytes by task 11063 on cpu 1:
 page_counter_try_charge+0x58/0x170 mm/page_counter.c:138
 try_charge+0x185/0xbf0 mm/memcontrol.c:2405
 mem_cgroup_try_charge+0xd2/0x260 mm/memcontrol.c:6404
 mem_cgroup_try_charge_delay+0x3a/0x80 mm/memcontrol.c:6419
 shmem_mfill_atomic_pte+0x337/0xed0 mm/shmem.c:2368
 shmem_mfill_zeropage_pte+0x69/0xa0 mm/shmem.c:2455
 mfill_atomic_pte mm/userfaultfd.c:438 [inline]
 __mcopy_atomic mm/userfaultfd.c:557 [inline]
 mfill_zeropage+0x840/0xbb0 mm/userfaultfd.c:614
 userfaultfd_zeropage fs/userfaultfd.c:1787 [inline]
 userfaultfd_ioctl+0x1541/0x2560 fs/userfaultfd.c:1889
 vfs_ioctl fs/ioctl.c:47 [inline]
 file_ioctl fs/ioctl.c:545 [inline]
 do_vfs_ioctl+0x84f/0xcf0 fs/ioctl.c:732
 ksys_ioctl+0xbd/0xe0 fs/ioctl.c:749
 __do_sys_ioctl fs/ioctl.c:756 [inline]
 __se_sys_ioctl fs/ioctl.c:754 [inline]
 __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:754
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11063 Comm: syz-executor.1 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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