Crash while using multiple syslog-ng-otlp() or opentelemetry() drivers without persist-name()

[mitzkia]

axosyslog version:

(dbld)micek@DESKTOP-0E9OKG3:/install/sbin$ ./syslog-ng -V
axosyslog 4 (4.8.0.217.g17b1fd8)
Config version: 4.2
Installer-Version: 4.8.0.217.g17b1fd8
Revision:
Compile-Date: Aug 26 2024 05:05:23

Reproduction:
Axosyslog got crahsed when started with the following configuration:

@version: 4.8

source group1 {
    syslog-ng-otlp();
    syslog-ng-otlp();
};

destination d_file {file("/tmp/out");};

log {
    source(group1);
    destination(d_file);
};

axosyslog start:

(dbld)micek@DESKTOP-0E9OKG3:/install/sbin$ ./syslog-ng -F -f axosyslog_otlp.conf
[2024-08-30T20:02:27.692708] Automatic assignment of persist names failed, as conflicting persist-names were found. Please override the automatically assigned identifier using an explicit perist-name() option or remove the duplicated configuration elements; persist_name='opentelemetry(4317)', location='axosyslog_otlp.conf:5:5', location='axosyslog_otlp.conf:4:5'
Segmentation fault

gdb:

[2024-08-30T19:57:50.031907] Automatic assignment of persist names failed, as conflicting persist-names were found. Please override the automatically assigned identifier using an explicit perist-name() option or remove the duplicated configuration elements; persist_name='opentelemetry(4317)', location='axosyslog_otlp.conf:22:5', location='axosyslog_otlp.conf:21:5'

Thread 1 "syslog-ng" received signal SIGSEGV, Segmentation fault.
0x00007ffff6e9c049 in std::__detail::_List_node_base::_M_transfer(std::__detail::_List_node_base*, std::__detail::_List_node_base*) () from /lib/x86_64-linux-gnu/libstdc++.so.6
(gdb) bt
#0  0x00007ffff6e9c049 in std::__detail::_List_node_base::_M_transfer(std::__detail::_List_node_base*, std::__detail::_List_node_base*) () from /lib/x86_64-linux-gnu/libstdc++.so.6
#1  0x00007ffff5b01854 in grpc::Server::ShutdownInternal(gpr_timespec) () from /lib/x86_64-linux-gnu/libgrpc++.so.1.51
#2  0x00007ffff5b01d8d in grpc::Server::~Server() () from /lib/x86_64-linux-gnu/libgrpc++.so.1.51
#3  0x00007ffff5b01e5d in grpc::Server::~Server() () from /lib/x86_64-linux-gnu/libgrpc++.so.1.51
#4  0x00007ffff62a775c in std::default_delete<grpc::Server>::operator() (this=0x5555555eeab8, __ptr=0x5555555f3260) at /usr/include/c++/14/bits/unique_ptr.h:93
#5  0x00007ffff62a5cce in std::unique_ptr<grpc::Server, std::default_delete<grpc::Server> >::~unique_ptr (this=0x5555555eeab8, __in_chrg=<optimized out>) at /usr/include/c++/14/bits/unique_ptr.h:398
#6  0x00007ffff62a3660 in syslogng::grpc::otel::SourceDriver::~SourceDriver (this=0x5555555eea00, __in_chrg=<optimized out>) at /source/modules/grpc/otel/otel-source.hpp:45
#7  0x00007ffff629df72 in _free (s=0x5555555863e0) at /source/modules/grpc/otel/otel-source.cpp:305
#8  0x00007ffff7e6a3f8 in _free (self=0x5555555863e0) at /source/lib/logpipe.c:118
#9  0x00007ffff7e6a4c4 in log_pipe_unref (self=0x5555555863e0) at /source/lib/logpipe.c:133
#10 0x00007ffff7e5a758 in _log_expr_node_free (self=0x555555586a30) at /source/lib/cfg-tree.c:306
#11 0x00007ffff7e5a200 in log_expr_node_unref (self=0x555555586a30) at /source/lib/cfg-tree.c:53
#12 0x00007ffff7e5a71a in _log_expr_node_free (self=0x555555586aa0) at /source/lib/cfg-tree.c:303
#13 0x00007ffff7e5a200 in log_expr_node_unref (self=0x555555586aa0) at /source/lib/cfg-tree.c:53
#14 0x00007ffff7e5a71a in _log_expr_node_free (self=0x555555586b10) at /source/lib/cfg-tree.c:303
#15 0x00007ffff7e5a200 in log_expr_node_unref (self=0x555555586b10) at /source/lib/cfg-tree.c:53
#16 0x00007ffff7cecf33 in g_hash_table_remove_all_nodes (hash_table=hash_table@entry=0x55555557f4a0, notify=notify@entry=1, destruction=destruction@entry=0) at ../../../glib/ghash.c:651
#17 0x00007ffff7ceea10 in g_hash_table_remove_all_nodes (hash_table=0x55555557f4a0, notify=1, destruction=0) at ../../../glib/ghash.c:573
#18 g_hash_table_remove_all (hash_table=0x55555557f4a0) at ../../../glib/ghash.c:1861
#19 0x00007ffff7ceea52 in g_hash_table_destroy (hash_table=0x55555557f4a0) at ../../../glib/ghash.c:1458
#20 0x00007ffff7e5d0ad in cfg_tree_free_instance (self=0x55555557f298) at /source/lib/cfg-tree.c:1679
#21 0x00007ffff7e521b9 in cfg_free (self=0x55555557f0c0) at /source/lib/cfg.c:703
#22 0x00007ffff7e7a38f in main_loop_free_config (self=0x7ffff7fbc460 <main_loop>) at /source/lib/mainloop.c:720
#23 0x00007ffff7e7a3b9 in main_loop_deinit (self=0x7ffff7fbc460 <main_loop>) at /source/lib/mainloop.c:727
#24 0x0000555555556a55 in main (argc=1, argv=0x7fffffffea18) at /source/syslog-ng/main.c:323