[Bug c++/30384] New: gdbserver get an error when father process exit

["hewei4321017 at 163 dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30384

            Bug ID: 30384
           Summary: gdbserver get an error when father process exit
           Product: gdb
           Version: 13.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: hewei4321017 at 163 dot com
  Target Milestone: ---

Overview:
  when debugging multi-process with gdb and gdbserver on ubuntu 22.04,
gdbserver get 
an error "Cannot get thread handle for LWP 556726: generic error" when parent
exit

Steps to Reproduce:
1、compile excutable
g++ main.cpp -g -o test

2、run gdbserver with command 
hewei@hewei-VirtualBox:~/project/gdb-13.1$ ./gdbserver/gdbserver  0.0.0.0:5012
/home/hewei/project/testipc/src/main/test
Process /home/hewei/project/testipc/src/main/test created; pid = 557078
Listening on port 5012

3、run gdb and input the following command
set mi-async on
set detach-on-fork off
set follow-fork-mode parent
set schedule-multiple on
target remote 10.27.8.145:5012
continue

4、when father process exit，gdbserver will get an error. 
Child exited with status 0
gdbserver: Cannot get thread handle for LWP 557093: generic error

5、After that，it won't be able to debug the child process any more. When I try
to switch to the child and press "ctrl + c" to interrupt the child in gdb, it
will output the following msg:

Reading
/usr/local/lib/debug/.build-id/02/17e95cdd5172617b053d3772efce4317a55898.debug
from remote target...
[Inferior 1 (process 557078) exited normally]
(gdb) info inferior
  Num  Description       Connection                  Executable
* 1    <null>            1 (remote 10.27.8.145:5012)
target:/home/hewei/project/testipc/src/main/test
  2    process 557093    1 (remote 10.27.8.145:5012)
target:/home/hewei/project/testipc/src/main/test
(gdb) inferior 2
[Switching to inferior 2 [process 557093]
(target:/home/hewei/project/testipc/src/main/test)]
[Switching to thread 2.1 (Thread 557093.557093)]
^C
^CThe target is not responding to GDB commands.
Stop debugging it? (y or n)

Actual Results:
  unable to continue debugging child process

Actual Results:
  After parent exit, I can continue to debug the child.

Additional Builds and Platforms
   gdb and gdbserver are built on ubuntu 22.04 with gcc 7.55

hewei@hewei-VirtualBox:~/project/testipc/src/main$ gcc --version
gcc (Ubuntu 7.5.0-6ubuntu2) 7.5.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

build command:
./configure --enable-targets=aarch64-linux-gnu,x86_64-linux-gnu 
CFLAGS="-lpthread -g" CXXFLAGS="-lpthread -g" LIBS="-lpthread -g" && make

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