bneradt opened a new issue, #10989:
URL: https://github.com/apache/trafficserver/issues/10989
I enabled HTTP/3 via alt svc on Docs, and it crashes almost immediately with
the following core:
```gdb
Thread 6 "[ET_NET 3]" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffef887700 (LWP 3958912)]
0x0000555555f1f238 in QUICStreamAdapter::stream (this=0x50) at
/home/bneradt/src/trafficserver_10/include/iocore/net/quic/QUICStreamAdapter.h:37
37 return _stream;
(gdb) bt
#0 0x0000555555f1f238 in QUICStreamAdapter::stream (this=0x50) at
/home/bneradt/src/trafficserver_10/include/iocore/net/quic/QUICStreamAdapter.h:37
#1 0x0000555555f419f5 in QPACK::_on_read_ready (this=0x7fffdc02d330,
vio=0x7fffa8000bf0) at
/home/bneradt/src/trafficserver_10/src/proxy/http3/QPACK.cc:1042
#2 0x0000555555f3d852 in QPACK::event_handler (this=0x7fffdc02d330,
event=100, data=0x7fffa8000bf0) at
/home/bneradt/src/trafficserver_10/src/proxy/http3/QPACK.cc:191
#3 0x0000555555a9f2cb in Continuation::handleEvent (this=0x7fffdc02d330,
event=100, data=0x7fffa8000bf0) at
/home/bneradt/src/trafficserver_10/include/iocore/eventsystem/Continuation.h:228
#4 0x0000555555ef30c7 in EThread::process_event (this=0x7ffff4001010,
e=0x7fffa8000bf0, calling_code=100) at
/home/bneradt/src/trafficserver_10/src/iocore/eventsystem/UnixEThread.cc:162
#5 0x0000555555ef3315 in EThread::process_queue (this=0x7ffff4001010,
NegativeQueue=0x7fffef8861b0, ev_count=0x7fffef88615c, nq_count=0x7fffef886158)
at /home/bneradt/src/trafficserver_10/src/iocore/eventsystem/UnixEThread.cc:197
#6 0x0000555555ef362f in EThread::execute_regular (this=0x7ffff4001010) at
/home/bneradt/src/trafficserver_10/src/iocore/eventsystem/UnixEThread.cc:255
#7 0x0000555555ef3a44 in EThread::execute (this=0x7ffff4001010) at
/home/bneradt/src/trafficserver_10/src/iocore/eventsystem/UnixEThread.cc:348
#8 0x0000555555ef224d in spawn_thread_internal (a=0x5555564447e0) at
/home/bneradt/src/trafficserver_10/src/iocore/eventsystem/Thread.cc:68
#9 0x00007ffff74a2609 in start_thread (arg=<optimized out>) at
pthread_create.c:477
#10 0x00007ffff73c7133 in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb) f 0
#0 0x0000555555f1f238 in QUICStreamAdapter::stream (this=0x50) at
/home/bneradt/src/trafficserver_10/include/iocore/net/quic/QUICStreamAdapter.h:37
37 return _stream;
(gdb) l
32 virtual ~QUICStreamAdapter() = default;
33
34 QUICStream &
35 stream()
36 {
37 return _stream;
38 }
39
40 virtual int64_t write(QUICOffset offset, const uint8_t *data,
uint64_t data_length, bool fin) = 0;
41 Ptr<IOBufferBlock> read(size_t len);
(gdb) up
#1 0x0000555555f419f5 in QPACK::_on_read_ready (this=0x7fffdc02d330,
vio=0x7fffa8000bf0) at
/home/bneradt/src/trafficserver_10/src/proxy/http3/QPACK.cc:1042
1042 QUICStreamId stream_id = static_cast<QUICStreamVCAdapter
*>(vio->vc_server)->stream().id();
(gdb) p vio->vc_server
$1 = (VConnection *) 0x0
```
This looks potentially similar, and maybe related to,
https://github.com/apache/trafficserver/issues/9888. But the backtrace is
different even though they both go through the `QUICStreamAdapter` so I thought
I'd file it as a separate issue. They can be duplicated later if it turns out
that they have the same root cause.
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