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BUG: KCSAN: data-race in do_task_stat / handle_mm_fault

write to 0xffff8881ecbeb610 of 8 bytes by task 7178 on cpu 0:
 mm_account_fault mm/memory.c:4407 [inline]
 handle_mm_fault+0x11f5/0x1af0 mm/memory.c:4471
 do_user_addr_fault+0x380/0x770 arch/x86/mm/fault.c:1294
 handle_page_fault arch/x86/mm/fault.c:1351 [inline]
 exc_page_fault+0xb8/0x330 arch/x86/mm/fault.c:1404
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:538

read to 0xffff8881ecbeb610 of 8 bytes by task 1 on cpu 1:
 do_task_stat+0x5ed/0x1020 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+0x2ee/0x900 fs/seq_file.c:208
 vfs_read+0x16d/0x5e0 fs/read_write.c:479
 ksys_read+0xce/0x180 fs/read_write.c:607
 __do_sys_read fs/read_write.c:617 [inline]
 __se_sys_read fs/read_write.c:615 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:615
 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 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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