Cores on nginx-quiche while running curl command

Hi ,

I tried to build nginx with quiche as explained below and tried to run curl with http3 but noticing below cores
[https://github.com/cloudflare/quiche/tree/master/nginx]

```
nginx -V
root@ubuntu:/tmp/cores# /src/nginx-1.16.1/objs/nginx -V
nginx version: nginx/1.16.1 (quiche-ab2b44fa)
built by gcc 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04)
built with OpenSSL 1.1.1 (compatible; BoringSSL) (running with BoringSSL)
TLS SNI support enabled
configure arguments: --prefix=/src/nginx-1.16.1 --build=quiche-ab2b44fa --with-http_ssl_module --with-http_v2_module --with-http_v3_module --with-openssl=../quiche/quiche/deps/boringssl --with-quiche=../quiche
```
curl command and version

```
root@ubuntu:/tmp/cores# curl -V
curl 8.3.0-DEV (x86_64-pc-linux-gnu) libcurl/8.3.0-DEV OpenSSL/1.1.1s zlib/1.2.11 brotli/1.0.9 msh3/0.6.0.0
Release-Date: [unreleased]
Protocols: dict file ftp ftps gopher gophers http https imap imaps mqtt pop3 pop3s rtsp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli HSTS HTTP3 HTTPS-proxy IPv6 Largefile libz NTLM NTLM_WB SSL threadsafe UnixSockets
root@ubuntu:/tmp/cores# curl -k -v --http3-only -# -o /tmp/index.html https://127.0.0.1:5443/index.html
```

below is the nginx bt

```
(gdb) bt
#0 0x000055d6712442c2 in ngx_quic_write_handler (wev=) at src/event/ngx_event_quic.c:411
#1 0x000055d67123456f in ngx_event_process_posted (cycle=cycle@entry=0x55d6737d0700, posted=0x55d6717a0280 )
at src/event/ngx_event_posted.c:34
#2 0x000055d67123405c in ngx_process_events_and_timers (cycle=cycle@entry=0x55d6737d0700) at src/event/ngx_event.c:267
#3 0x000055d67123bf51 in ngx_worker_process_cycle (cycle=0x55d6737d0700, data=) at src/os/unix/ngx_process_cycle.c:750
#4 0x000055d67123a431 in ngx_spawn_process (cycle=cycle@entry=0x55d6737d0700,
proc=proc@entry=0x55d67123be67 , data=data@entry=0x4, name=name@entry=0x55d6715d8236 "worker process",
respawn=respawn@entry=-3) at src/os/unix/ngx_process.c:199
#5 0x000055d67123b537 in ngx_start_worker_processes (cycle=cycle@entry=0x55d6737d0700, n=8, type=type@entry=-3)
at src/os/unix/ngx_process_cycle.c:359
#6 0x000055d67123c62d in ngx_master_process_cycle (cycle=cycle@entry=0x55d6737d0700) at src/os/unix/ngx_process_cycle.c:131
#7 0x000055d671214e0f in main (argc=, argv=) at src/core/nginx.c:382
(gdb) quit

```

nginx error log file

```
2023/09/06 11:26:06 [alert] 240245#0: worker process 240272 exited on signal 11 (core dumped)
2023/09/06 11:26:08 [alert] 240245#0: worker process 240274 exited on signal 11 (core dumped)
2023/09/06 11:26:12 [alert] 240245#0: worker process 240276 exited on signal 11 (core dumped)
2023/09/06 11:26:26 [alert] 240245#0: worker process 240247 exited on signal 11 (core dumped)
2023/09/06 11:26:27 [alert] 240245#0: worker process 240303 exited on signal 11 (core dumped)
2023/09/06 11:26:29 [alert] 240245#0: worker process 240305 exited on signal 11 (core dumped)
2023/09/06 11:26:33 [alert] 240245#0: worker process 240307 exited on signal 11 (core dumped)
2023/09/06 11:31:05 [alert] 240245#0: worker process 240250 exited on signal 11 (core dumped)
2023/09/06 11:31:06 [alert] 240245#0: worker process 241691 exited on signal 11 (core dumped)
2023/09/06 11:31:08 [alert] 240245#0: worker process 241692 exited on signal 11 (core dumped)
2023/09/06 11:31:12 [alert] 240245#0: worker process 241693 exited on signal 11 (core dumped)
2023/09/06 11:38:52 [alert] 240245#0: worker process 241694 exited on signal 11 (core dumped)
2023/09/06 11:38:53 [alert] 240245#0: worker process 241734 exited on signal 11 (core dumped)
2023/09/06 11:38:55 [alert] 240245#0: worker process 241735 exited on signal 11 (core dumped)
2023/09/06 11:38:59 [alert] 240245#0: worker process 241736 exited on signal 11 (core dumped)
root@ubuntu:/tmp/cores#
```
am i missing anything here?