maskit opened a new issue #7115:
URL: https://github.com/apache/trafficserver/issues/7115


   Found on docs server
   
   ```
   (gdb) bt
   #0  0x00000000007c9d26 in IOBufferReader::is_read_avail_more_than (this=0x0, 
size=0) at /usr/local/src/trafficserver/iocore/eventsystem/P_IOBuffer.h:538
   #1  0x0000000000b14ad5 in QUICBidirectionalStream::will_generate_frame 
(this=0x2acd3320c000, level=QUICEncryptionLevel::ONE_RTT, 
current_packet_size=6, ack_eliciting=false, seq_num=973) at 
QUICBidirectionalStream.cc:359
   #2  0x0000000000ac74b5 in QUICStreamManager::will_generate_frame 
(this=0x2acd4041a2c0, level=QUICEncryptionLevel::ONE_RTT, 
current_packet_size=6, ack_eliciting=false, seq_num=973) at 
QUICStreamManager.cc:426
   #3  0x0000000000a42167 in QUICNetVConnection::_packetize_frames 
(this=0x2acd422a12c0, packet_buf=0x2acd304006a0 "\360\006@0\315*", 
level=QUICEncryptionLevel::ONE_RTT, max_packet_size=1280, frames=std::vector of 
length 1, capacity 1 = {...}) at QUICNetVConnection.cc:1685
   #4  0x0000000000a412a3 in QUICNetVConnection::_state_common_send_packet 
(this=0x2acd422a12c0) at QUICNetVConnection.cc:1529
   #5  0x0000000000a3e093 in QUICNetVConnection::state_connection_established 
(this=0x2acd422a12c0, event=2501, data=0x2acd2e704720) at 
QUICNetVConnection.cc:900
   #6  0x000000000075dc05 in Continuation::handleEvent (this=0x2acd422a12c0, 
event=2501, data=0x2acd2e704720) at 
/usr/local/src/trafficserver/iocore/eventsystem/I_Continuation.h:190
   #7  0x0000000000a834e9 in EThread::process_event (this=0x2acd2f513000, 
e=0x2acd2e704720, calling_code=2501) at UnixEThread.cc:127
   #8  0x0000000000a83a8f in EThread::execute_regular (this=0x2acd2f513000) at 
UnixEThread.cc:236
   #9  0x0000000000a83dcd in EThread::execute (this=0x2acd2f513000) at 
UnixEThread.cc:327
   #10 0x0000000000a82839 in spawn_thread_internal (a=0x2acd2e6f58c0) at 
Thread.cc:92
   #11 0x00002acd2c6e7ea5 in start_thread () from /lib64/libpthread.so.0
   #12 0x00002acd2d41d8dd in clone () from /lib64/libc.so.6
   ```
   
   On frame 1
   ```
   (gdb) p this->_write_vio
   $1 = {
     cont = 0x0, 
     nbytes = 0, 
     ndone = 0, 
     op = 0, 
     buffer = {
       name = 0x0, 
       mbuf = 0x0, 
       entry = 0x0
     }, 
     vc_server = 0x0, 
     mutex = {
       m_ptr = 0x0
     }, 
     _disabled = false
   }
   (gdb) p this->handler
   $2 = (int (Continuation::*)(Continuation * const, int, void *)) 0xb13032 
<QUICBidirectionalStream::state_stream_open(int, void*)>
   ```


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