I've managed to download symbols and run gdb again:
coredumpctl gdb 3417359
bt
(32000+ lines omitted)
last 10 lines:
#32622 0x0000563c46ae0e1f in pan::NNTP::on_socket_response
(this=0x563c479e5bd0, sock=<optimized out>, line_in=...) at
./pan/tasks/nntp.cc:317
#32623 0x0000563c46b0e931 in pan::GIOChannelSocketGnuTLS::do_read
(this=this@entry=0x7fc290001370) at ../../pan/general/string-view.h:153
#32624 0x0000563c46b0ef36 in pan::GIOChannelSocketGnuTLS::gio_func
(this=0x7fc290001370, channel=0x7fc290001830, cond=G_IO_IN) at
./pan/tasks/socket-impl-openssl.cc:736
#32625 0x00007fc29f3bc67f in g_main_dispatch (context=0x563c470eb970) at
../../../glib/gmain.c:3444
#32626 g_main_context_dispatch (context=0x563c470eb970) at
../../../glib/gmain.c:4162
#32627 0x00007fc29f3bca38 in g_main_context_iterate
(context=0x563c470eb970, block=block@entry=1, dispatch=dispatch@entry=1,
self=<optimized out>) at ../../../glib/gmain.c:4238
#32628 0x00007fc29f3bccef in g_main_loop_run (loop=0x563c47cbf360) at
../../../glib/gmain.c:4438
#32629 0x00007fc29fa07bf5 in gtk_main () at ../../../gtk/gtkmain.c:1329
#32630 0x0000563c469eba6b in (anonymous namespace)::run_pan_in_window
(group_prefs=..., window=0x563c474122a0, prefs=..., queue=..., data=...,
_gui=0x563c4721f600) at ./pan/gui/pan.cc:561
#32631 main (argc=<optimized out>, argv=<optimized out>) at
./pan/gui/pan.cc:1115
(gdb)
