sudheerv opened a new issue #6853:
URL: https://github.com/apache/trafficserver/issues/6853
Seeing this crash in ats9 in prod.
It's a bit strange that `dynamic_cast` would crash this way.
`Http2ClientSession` is no longer a subclass of `PluginIdentity` and only
`PluginVC` now is derived from `PluginIdentity`, but it's odd that instead of
returning a nullptr, dynamic_cast is causing a SegFault on attempting to do
that.
Everything else about the pointer seems fine (i.e it seems to be a valid SSL
VC pointer). Given that, this dynamic_cast is not required anymore (ie no real
netvc is of type `PluginIdentity` anymore, I'm going to try just guarding it
with `is_internal_request()` check to see if it helps. It's still pretty
strange that it's crashing like this though.
```
(gdb) bt
#0 0x00002b88ea38987e in __cxxabiv1::__dynamic_cast
(src_ptr=0x2b89451cb5d0, src_type=0x81dd48 <typeinfo for NetVConnection>,
dst_type=dst_type@entry=0x7c49d8 <typeinfo for PluginIdentity>,
src2dst=src2dst@entry=-2)
at ../../.././libstdc++-v3/libsupc++/dyncast.cc:71
#1 0x000000000071d0e8 in ProxyTransaction::new_transaction
(this=this@entry=0x2b894a65e240, from_early_data=<optimized out>) at
ProxyTransaction.cc:46
#2 0x0000000000523c11 in new_transaction (this=0x2b894a65ded0) at
Http1ClientSession.cc:473
#3 Http1ClientSession::state_keep_alive (this=0x2b894a65ded0, event=100,
data=<optimized out>) at Http1ClientSession.cc:388
#4 0x0000000000770393 in handleEvent (data=0x2b89451cb7b0, event=100,
this=0x2b894a65ded0) at
/home/svinukon/Traffic/ATS/ats9/ats-core_trunk/ats9/src/iocore/eventsystem/I_Continuation.h:190
#5 read_signal_and_update (vc=0x2b89451cb5d0, event=100) at
UnixNetVConnection.cc:83
#6 UnixNetVConnection::readSignalAndUpdate (this=this@entry=0x2b89451cb5d0,
event=event@entry=100) at UnixNetVConnection.cc:1016
#7 0x0000000000741d53 in SSLNetVConnection::net_read_io
(this=0x2b89451cb5d0, nh=0x2b88ef623d80, lthread=<optimized out>) at
SSLNetVConnection.cc:671
#8 0x0000000000760208 in NetHandler::process_ready_list
(this=this@entry=0x2b88ef623d80) at UnixNet.cc:412
#9 0x00000000007604fd in NetHandler::waitForActivity (this=0x2b88ef623d80,
timeout=<optimized out>) at UnixNet.cc:547
#10 0x00000000007be9ba in EThread::execute_regular
(this=this@entry=0x2b88ef620000) at UnixEThread.cc:266
#11 0x00000000007bec82 in EThread::execute (this=0x2b88ef620000) at
UnixEThread.cc:327
#12 0x00000000007bd029 in spawn_thread_internal (a=0x2b88ec163ec0) at
Thread.cc:92
#13 0x00002b88e9ee3dd5 in start_thread () from /lib64/libpthread.so.0
#14 0x00002b88eac94ead in clone () from /lib64/libc.so.6
(gdb) p *this
```
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