==================================================================
BUG: KCSAN: data-race in exit_signals / task_dump_owner

write to 0xffff8880289b402c of 4 bytes by task 19932 on cpu 1:
 exit_signals+0x118/0x550 kernel/signal.c:2869
 do_exit+0x197/0x15e0 kernel/exit.c:781
 do_group_exit+0x17d/0x180 kernel/exit.c:922
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:933
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:931
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:931
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8880289b402c of 4 bytes by task 19939 on cpu 0:
 task_dump_owner+0x2b/0x1b0 fs/proc/base.c:1822
 pid_update_inode fs/proc/base.c:1964 [inline]
 pid_revalidate+0x69/0x110 fs/proc/base.c:1987
 lookup_fast+0x1fd/0x350 fs/namei.c:823
 walk_component+0x5c/0x350 fs/namei.c:1935
 lookup_last fs/namei.c:2396 [inline]
 path_lookupat+0x12d/0x570 fs/namei.c:2420
 filename_lookup+0xf2/0x380 fs/namei.c:2453
 kern_path+0x2e/0x40 fs/namei.c:2540
 create_local_trace_uprobe+0x3f/0x3c0 kernel/trace/trace_uprobe.c:1592
 perf_uprobe_init+0xbe/0x140 kernel/trace/trace_event_perf.c:323
 perf_uprobe_event_init+0xde/0x140 kernel/events/core.c:9754
 perf_try_init_event+0x21a/0x400 kernel/events/core.c:11071
 perf_init_event kernel/events/core.c:11123 [inline]
 perf_event_alloc+0x80b/0x1b20 kernel/events/core.c:11403
 __do_sys_perf_event_open kernel/events/core.c:11883 [inline]
 __se_sys_perf_event_open+0x5ce/0x25d0 kernel/events/core.c:11775
 __x64_sys_perf_event_open+0x63/0x70 kernel/events/core.c:11775
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 19939 Comm: syz-executor.1 Not tainted 5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================