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BUG: KCSAN: data-race in do_task_stat / handle_mm_fault

write to 0xffff8881534cd638 of 8 bytes by task 23910 on cpu 1:
 mm_account_fault mm/memory.c:4741 [inline]
 handle_mm_fault+0x70f/0x1a50 mm/memory.c:4805
 do_user_addr_fault+0x609/0xbe0 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x91/0x220 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568

read to 0xffff8881534cd638 of 8 bytes by task 1 on cpu 0:
 do_task_stat+0x5ed/0x10c0 fs/proc/array.c:535
 proc_tgid_stat+0x2f/0x40 fs/proc/array.c:665
 proc_single_show+0x84/0x100 fs/proc/base.c:774
 seq_read_iter+0x2e1/0x930 fs/seq_file.c:230
 seq_read+0x223/0x260 fs/seq_file.c:162
 vfs_read+0x1ea/0x730 fs/read_write.c:483
 ksys_read+0xce/0x180 fs/read_write.c:623
 __do_sys_read fs/read_write.c:633 [inline]
 __se_sys_read fs/read_write.c:631 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:631
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x000000000000001e -> 0x0000000000000020

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1 Comm: systemd Tainted: G        W         5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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