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BUG: KCSAN: data-race in do_task_stat / handle_mm_fault

read-write to 0xffff8880238db670 of 8 bytes by task 26439 on cpu 0:
 mm_account_fault mm/memory.c:4557 [inline]
 handle_mm_fault+0x156e/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 0xffff8880238db670 of 8 bytes by task 26433 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+0x2de/0x890 fs/seq_file.c:208
 do_loop_readv_writev fs/read_write.c:761 [inline]
 do_iter_read+0x3b1/0x4b0 fs/read_write.c:803
 vfs_readv fs/read_write.c:921 [inline]
 do_preadv+0x139/0x210 fs/read_write.c:1013
 __do_sys_preadv fs/read_write.c:1063 [inline]
 __se_sys_preadv fs/read_write.c:1058 [inline]
 __x64_sys_preadv+0x54/0x60 fs/read_write.c:1058
 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: 26433 Comm: syz-executor.2 Not tainted 5.10.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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