bdgranger commented on issue #7581:
URL: https://github.com/apache/trafficserver/issues/7581#issuecomment-800538431
An example of the Http2 stream_release crash:
```c++
(gdb) bt
#0 0x0000000000718022 in Mutex_trylock (t=0x2b9c77445010, m=<optimized out>)
at /usr/src/debug/trafficserver-8.1.2/iocore/eventsystem/I_Lock.h:287
#1 MutexTryLock (t=0x2b9c77445010, am=..., this=0x2b9c7df4db60)
at /usr/src/debug/trafficserver-8.1.2/iocore/eventsystem/I_Lock.h:555
#2 _close_vc (total_idle_count=<synthetic pointer>,
total_idle_time=<synthetic pointer>, closed=<synthetic pointer>,
handle_event=<synthetic pointer>, now=1615767053666485882, vc=<optimized
out>, this=0x2b9c77448cf0) at UnixNet.cc:648
#3 manage_keep_alive_queue (this=0x2b9c77448cf0) at UnixNet.cc:626
#4 NetHandler::add_to_keep_alive_queue (this=0x2b9c77448cf0, vc=<optimized
out>) at UnixNet.cc:698
#5 0x00000000005854c2 in Http2ConnectionState::release_stream
(this=this@entry=0x2b9ccb364f78,
stream=stream@entry=0x2ba7d54626c0) at Http2ConnectionState.cc:1403
#6 0x00000000005924df in Http2Stream::destroy (this=0x2ba7d54626c0) at
Http2Stream.cc:784
#7 0x000000000058ea8f in Http2Stream::terminate_if_possible
(this=this@entry=0x2ba7d54626c0) at Http2Stream.cc:414
#8 0x0000000000591a37 in Http2Stream::main_event_handler
(this=0x2ba7d54626c0, event=<optimized out>, edata=<optimized out>)
at Http2Stream.cc:149
#9 0x0000000000760912 in handleEvent (data=0x2ba7d9fdd340, event=103,
this=<optimized out>) at I_Continuation.h:160
#10 EThread::process_event (this=this@entry=0x2b9c77445010,
e=e@entry=0x2ba7d9fdd340, calling_code=103) at UnixEThread.cc:131
#11 0x00000000007611de in EThread::process_queue
(this=this@entry=0x2b9c77445010,
NegativeQueue=NegativeQueue@entry=0x2b9c7df4de70,
ev_count=ev_count@entry=0x2b9c7df4de6c,
nq_count=nq_count@entry=0x2b9c7df4de68) at UnixEThread.cc:170
#12 0x00000000007617c8 in EThread::execute_regular (this=0x2b9c77445010) at
UnixEThread.cc:230
#13 0x000000000076030a in spawn_thread_internal (a=0x187b5d0) at Thread.cc:85
#14 0x00002b9c7331fe65 in start_thread () from /lib64/libpthread.so.0
#15 0x00002b9c7405588d in clone () from /lib64/libc.so.6
```
full bt:
```c++
(gdb) bt full
#0 0x0000000000718022 in Mutex_trylock (t=0x2b9c77445010, m=<optimized out>)
at /usr/src/debug/trafficserver-8.1.2/iocore/eventsystem/I_Lock.h:287
No locals.
#1 MutexTryLock (t=0x2b9c77445010, am=..., this=0x2b9c7df4db60)
at /usr/src/debug/trafficserver-8.1.2/iocore/eventsystem/I_Lock.h:555
No locals.
#2 _close_vc (total_idle_count=<synthetic pointer>,
total_idle_time=<synthetic pointer>, closed=<synthetic pointer>,
handle_event=<synthetic pointer>, now=1615767053666485882, vc=<optimized
out>, this=0x2b9c77448cf0) at UnixNet.cc:648
lock = {m = {m_ptr = 0x0}, lock_acquired = true}
diff = <optimized out>
#3 manage_keep_alive_queue (this=0x2b9c77448cf0) at UnixNet.cc:626
vc = 0x2b9fee0b4000
total_connections_in = <optimized out>
vc_next = 0x0
closed = 0
total_idle_time = 0
handle_event = 0
total_idle_count = 0
#4 NetHandler::add_to_keep_alive_queue (this=0x2b9c77448cf0, vc=<optimized
out>) at UnixNet.cc:698
__FUNCTION__ = "add_to_keep_alive_queue"
#5 0x00000000005854c2 in Http2ConnectionState::release_stream
(this=this@entry=0x2b9ccb364f78,
stream=stream@entry=0x2ba7d54626c0) at Http2ConnectionState.cc:1403
vc = <optimized out>
__FUNCTION__ = "release_stream"
lock = {m = {m_ptr = 0x2ba2b7624950}, locked_p = true}
#6 0x00000000005924df in Http2Stream::destroy (this=0x2ba7d54626c0) at
Http2Stream.cc:784
h2_proxy_ssn = 0x2b9ccb364cb0
lock = {m = {m_ptr = 0x2ba2b7624950}, locked_p = true}
__FUNCTION__ = "destroy"
lock = {m = {m_ptr = 0x2b9fed9c5670}, locked_p = true}
cid = 23156238
#7 0x000000000058ea8f in Http2Stream::terminate_if_possible
(this=this@entry=0x2ba7d54626c0) at Http2Stream.cc:414
h2_proxy_ssn = 0x2b9ccb364cb0
lock = {m = {m_ptr = 0x2ba2b7624950}, locked_p = true}
__FUNCTION__ = "terminate_if_possible"
#8 0x0000000000591a37 in Http2Stream::main_event_handler
(this=0x2ba7d54626c0, event=<optimized out>, edata=<optimized out>)
at Http2Stream.cc:149
lock = {m = {m_ptr = 0x2b9fed9c5670}, locked_p = true}
__FUNCTION__ = "main_event_handler"
e = <optimized out>
#9 0x0000000000760912 in handleEvent (data=0x2ba7d9fdd340, event=103,
this=<optimized out>) at I_Continuation.h:160
No locals.
#10 EThread::process_event (this=this@entry=0x2b9c77445010,
e=e@entry=0x2ba7d9fdd340, calling_code=103) at UnixEThread.cc:131
c_temp = <optimized out>
lock = {m = {m_ptr = 0x2b9fed9c5670}, lock_acquired = true}
#11 0x00000000007611de in EThread::process_queue
(this=this@entry=0x2b9c77445010,
NegativeQueue=NegativeQueue@entry=0x2b9c7df4de70,
ev_count=ev_count@entry=0x2b9c7df4de6c,
nq_count=nq_count@entry=0x2b9c7df4de68) at UnixEThread.cc:170
e = 0x2ba7d9fdd340
#12 0x00000000007617c8 in EThread::execute_regular (this=0x2b9c77445010) at
UnixEThread.cc:230
done_one = <optimized out>
sleep_time = <optimized out>
e = <optimized out>
NegativeQueue = {<DLL<Event, Event::Link_link>> = {head = 0x0}, tail
= 0x0}
next_time = <optimized out>
delta = <optimized out>
prev_metric = 0x2b9c7754bf30
nq_count = 184
ev_count = 185
METRIC_INIT = {_loop_time = {_start = 0, _min = 9223372036854775807,
_max = 0}, _events = {_min = 2147483647, _max = 0,
_total = 0}, _count = 0, _wait = 0}
#13 0x000000000076030a in spawn_thread_internal (a=0x187b5d0) at Thread.cc:85
p = 0x187b5d0
#14 0x00002b9c7331fe65 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#15 0x00002b9c7405588d in clone () from /lib64/libc.so.6
No symbol table info available.
```
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