Fwd: NSD 4.2.0 intermittent segfaults @ libssl ?

now with debug symbols installed :-)

(gdb) bt
#0  0x00007ffbee334a8a in SSL_free () from /lib/x86_64-linux-gnu/libssl.so.1.1
#1  0x000055d50cb2ce1a in cleanup_tcp_handler (data=0x55d50ec17d80) at server.c:3001
#2  0x000055d50cb2dfd8 in handle_tcp_reading (fd=<optimized out>, event=<optimized out>, arg=0x55d50ec17d80) at server.c:3188
#3  0x00007ffbed81a413 in ev_invoke_pending () from /lib/x86_64-linux-gnu/libev.so.4
#4  0x00007ffbed81da06 in ev_run () from /lib/x86_64-linux-gnu/libev.so.4
#5  0x00007ffbed81ffd9 in event_base_loop () from /lib/x86_64-linux-gnu/libev.so.4
#6  0x000055d50cb30bdd in server_child (nsd=nsd@entry=0x55d50cdbffa0 <nsd>) at server.c:2652
#7  0x000055d50cb30fcb in restart_child_servers (nsd=nsd@entry=0x55d50cdbffa0 <nsd>, region=region@entry=0x55d50ebf9490, netio=netio@entry=0x55d50ec0f7c0, xfrd_sock_p=0x55d50ebca532) at server.c:427
#8  0x000055d50cb3244c in server_main (nsd=0x55d50cdbffa0 <nsd>) at server.c:2200
#9  0x000055d50cae3ff7 in main (argc=<optimized out>, argv=<optimized out>) at nsd.c:1147