Assertion `s != -1' failed

[devkdas]

./udpfw -l 5443 127.0.0.1 5443

udpfw: /root/quicly/t/udpfw.c:109: new_socket: Assertion `s != -1' failed.

Program received signal SIGABRT, Aborted.
__pthread_kill_implementation (no_tid=0, signo=6, threadid=140737351530304) at ./nptl/pthread_kill.c:44
44      ./nptl/pthread_kill.c: No such file or directory.
(gdb) bt
#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=140737351530304) at ./nptl/pthread_kill.c:44
#1  __pthread_kill_internal (signo=6, threadid=140737351530304) at ./nptl/pthread_kill.c:78
#2  __GI___pthread_kill (threadid=140737351530304, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3  0x00007ffff7dc8476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4  0x00007ffff7dae7f3 in __GI_abort () at ./stdlib/abort.c:79
#5  0x00007ffff7dae71b in __assert_fail_base (fmt=0x7ffff7f63150 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n",
    assertion=0x55555555701f "s != -1", file=0x555555557004 "/root/quicly/t/udpfw.c", line=109, function=<optimized out>)
    at ./assert/assert.c:92
#6  0x00007ffff7dbfe96 in __GI___assert_fail (assertion=assertion@entry=0x55555555701f "s != -1",
    file=file@entry=0x555555557004 "/root/quicly/t/udpfw.c", line=line@entry=109,
    function=function@entry=0x555555557780 <__PRETTY_FUNCTION__.4> "new_socket") at ./assert/assert.c:101
#7  0x0000555555555b17 in new_socket (sin_family=<optimized out>) at /root/quicly/t/udpfw.c:109
#8  0x0000555555555f73 in find_or_create_connection (salen=<optimized out>, sa=0x7fffffffe0a0) at /root/quicly/t/udpfw.c:146
#9  enqueue (q=q@entry=0x555555559120 <up>, conn=conn@entry=0x0, now=now@entry=1696494679108001) at /root/quicly/t/udpfw.c:206
#10 0x0000555555555965 in main (argc=<optimized out>, argv=<optimized out>) at /root/quicly/t/udpfw.c:409
(gdb)
quit