gdb on qemu: Cannot find user-level thread for LWP 207618: generic error

[Feng Li]

Hi, I use gdb on Fedora 34. Qemu is the master branch and Fedora 34
repo(qemu-kvm-5.2.0-5.fc34.1.x86_64).

(gdb) c
Continuing.
[LWP 3726555 exited]
^C
Thread 1 "qemu-kvm" received signal SIGINT, Interrupt.
0x00007fef9d163afe in ppoll () from /lib64/libc.so.6
(gdb) bt
#0  0x00007fef9d163afe in ppoll () at /lib64/libc.so.6
#1  0x0000560a820f23c5 in ppoll (__ss=0x0, __timeout=0x7ffdb0d485b0,
__nfds=<optimized out>, __fds=<optimized out>)
    at /usr/include/bits/poll2.h:79
#2  qemu_poll_ns (fds=<optimized out>, nfds=<optimized out>,
timeout=<optimized out>) at ../util/qemu-timer.c:349
#3  0x0000560a820f582e in os_host_main_loop_wait (timeout=994750) at
../util/main-loop.c:239
#4  main_loop_wait (nonblocking=-1328249364, nonblocking@entry=0) at
../util/main-loop.c:520
#5  0x0000560a81f09027 in qemu_main_loop () at ../softmmu/vl.c:1678
#6  0x0000560a81c824d2 in main (argc=<optimized out>, argv=<optimized
out>, envp=<optimized out>) at ../softmmu/main.c:50
(gdb) c
Continuing.
Cannot find user-level thread for LWP 207618: generic error


$ gdb --version
GNU gdb (GDB) Fedora 10.2-3.fc34
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

I couldn't find any useful knowledge.
How could I bypass this issue?
Thanks in advance.