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BUG: KCSAN: data-race in do_task_stat / handle_mm_fault

read-write to 0xffff888023ef8638 of 8 bytes by task 8472 on cpu 0:
 mm_account_fault mm/memory.c:4557 [inline]
 handle_mm_fault+0x1572/0x1770 mm/memory.c:4621
 do_user_addr_fault+0x33e/0x730 arch/x86/mm/fault.c:1372
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x91/0x290 arch/x86/mm/fault.c:1485
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:583

read to 0xffff888023ef8638 of 8 bytes by task 1 on cpu 1:
 do_task_stat+0x61d/0x1070 fs/proc/array.c:504
 proc_tgid_stat+0x2f/0x40 fs/proc/array.c:633
 proc_single_show+0x84/0x100 fs/proc/base.c:775
 seq_read_iter+0x2ef/0x8e0 fs/seq_file.c:228
 seq_read+0x221/0x260 fs/seq_file.c:159
 vfs_read+0x154/0x5c0 fs/read_write.c:494
 ksys_read+0xce/0x180 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:642
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1 Comm: systemd Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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