Description of problem:

When the prompt for authentication appears and the user just hits Ctrl-D to abort, pkttyagent dumps core with following backtrace:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
Core was generated by `/usr/bin/pkttyagent --notify-fd 5 --fallback'.
Program terminated with signal SIGTRAP, Trace/breakpoint trap.
#0  0x00007eff7b5e45f5 in _g_log_abort (breakpoint=1) at gmessages.c:580
580	    G_BREAKPOINT ();
[Current thread is 1 (Thread 0x7eff759cc700 (LWP 11071))]
(gdb) bt
#0  0x00007eff7b5e45f5 in _g_log_abort (breakpoint=1) at gmessages.c:580
#1  0x00007eff7b5e56a1 in g_log_default_handler (log_domain=log_domain@entry=0x0, log_level=log_level@entry=6, 
    message=message@entry=0x7eff6800c220 "Got unexpected EOF while reading from controlling terminal.", 
    unused_data=unused_data@entry=0x0) at gmessages.c:3158
#2  0x00007eff7b5e58ef in g_logv (log_domain=0x0, log_level=G_LOG_LEVEL_ERROR, format=<optimized out>, 
    args=args@entry=0x7eff759cb2e0) at gmessages.c:1370
#3  0x00007eff7b5e5ae3 in g_log (log_domain=<optimized out>, log_level=<optimized out>, format=<optimized out>)
    at gmessages.c:1432
#4  0x00007eff7bb045f3 in on_request () from /lib64/libpolkit-agent-1.so.0
#5  0x00007eff7b8ba3bd in g_closure_invoke (closure=0x7eff6c009d90, return_value=0x0, n_param_values=3, 
    param_values=0x7eff759cb640, invocation_hint=0x7eff759cb5c0) at gclosure.c:804
#6  0x00007eff7b8cd945 in signal_emit_unlocked_R (node=node@entry=0x55738748e7b0, detail=detail@entry=0, 
    instance=instance@entry=0x7eff68007b00, emission_return=emission_return@entry=0x0, 
    instance_and_params=instance_and_params@entry=0x7eff759cb640) at gsignal.c:3635
#7  0x00007eff7b8d6a06 in g_signal_emit_valist (instance=instance@entry=0x7eff68007b00, 
    signal_id=signal_id@entry=10, detail=detail@entry=0, var_args=var_args@entry=0x7eff759cb878) at gsignal.c:3391
#8  0x00007eff7b8d7526 in g_signal_emit_by_name (instance=0x7eff68007b00, detailed_signal=<optimized out>)
    at gsignal.c:3487
#9  0x00007eff7bb023f7 in io_watch_have_data () from /lib64/libpolkit-agent-1.so.0
#10 0x00007eff7b5de67d in g_main_dispatch (context=0x7eff6c000b20) at gmain.c:3176
#11 g_main_context_dispatch (context=context@entry=0x7eff6c000b20) at gmain.c:3829
#12 0x00007eff7b5dea48 in g_main_context_iterate (context=0x7eff6c000b20, block=block@entry=1, 
    dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3902
#13 0x00007eff7b5ded72 in g_main_loop_run (loop=0x7eff6c003610) at gmain.c:4098
#14 0x00007eff7bb02ed7 in server_thread_func () from /lib64/libpolkit-agent-1.so.0
#15 0x00007eff7b606d9a in g_thread_proxy (data=0x55738747eb70) at gthread.c:784
#16 0x00007eff7b3792de in start_thread (arg=<optimized out>) at pthread_create.c:486
#17 0x00007eff7b0aa133 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------


Version-Release number of selected component (if applicable):

polkit-0.115-9.el8.x86_64


How reproducible:

Always


Steps to Reproduce:
1. As a normal user, issue some command requiring authentication

  $ systemctl start foo

  ==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ====
  Authentication is required to start 'foo.service'.
  Authenticating as: rmetrich
  Password: 

2. Hit Ctrl-D

Actual results:

  ** (pkttyagent:11148): ERROR **: 09:47:16.382: Got unexpected EOF while reading from controlling terminal.
  polkit-agent-helper-1: pam_authenticate failed: Authentication failure

  + coredump