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BUG: KCSAN: data-race in futex_wait_queue_me / task_dump_owner

write to 0xffff8880b25f20a4 of 4 bytes by task 15314 on cpu 0:
 freezer_do_not_count include/linux/freezer.h:109 [inline]
 freezable_schedule include/linux/freezer.h:171 [inline]
 futex_wait_queue_me+0x186/0x250 kernel/futex.c:2634
 futex_wait+0x145/0x390 kernel/futex.c:2740
 do_futex+0x144a/0x21c0 kernel/futex.c:3811
 __do_sys_futex kernel/futex.c:3872 [inline]
 __se_sys_futex+0x26d/0x330 kernel/futex.c:3840
 __x64_sys_futex+0x74/0x80 kernel/futex.c:3840
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b25f20a4 of 4 bytes by task 15318 on cpu 1:
 task_dump_owner+0x2b/0x1b0 fs/proc/base.c:1809
 pid_update_inode fs/proc/base.c:1951 [inline]
 proc_pident_instantiate+0x138/0x190 fs/proc/base.c:2604
 proc_pident_lookup fs/proc/base.c:2628 [inline]
 proc_tgid_base_lookup+0x10c/0x180 fs/proc/base.c:3276
 __lookup_slow+0x182/0x250 fs/namei.c:1544
 lookup_slow fs/namei.c:1561 [inline]
 walk_component+0x2a5/0x350 fs/namei.c:1860
 link_path_walk+0x462/0x730 fs/namei.c:2179
 path_openat+0x199/0x20e0 fs/namei.c:3356
 do_filp_open+0xbd/0x1d0 fs/namei.c:3387
 do_sys_openat2+0x33c/0x4a0 fs/open.c:1179
 do_sys_open fs/open.c:1195 [inline]
 ksys_open include/linux/syscalls.h:1388 [inline]
 __do_sys_open fs/open.c:1201 [inline]
 __se_sys_open fs/open.c:1199 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1199
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15318 Comm: syz-executor.0 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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