#0  0xb77c4424 in __kernel_vsyscall ()
#1  0xb75f9b1f in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
  [Error: ../nptl/sysdeps/unix/sysv/linux/raise.c was not found in source tree]
#2  0xb75fd0b3 in __GI_abort () at abort.c:90
  [Error: abort.c was not found in source tree]
#3  0xb75f2877 in __assert_fail_base (fmt=0xb7738674 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0xb751ed8f "backend != ((void *)0)", file=file@entry=0xb751ed78 "./plugin.c", line=line@entry=695, function=function@entry=0xb751f214 <__PRETTY_FUNCTION__.6829> "open_input_source") at assert.c:92
  [Error: assert.c was not found in source tree]
#4  0xb75f2927 in __GI___assert_fail (assertion=assertion@entry=0xb751ed8f "backend != ((void *)0)", file=file@entry=0xb751ed78 "./plugin.c", line=line@entry=695, function=function@entry=0xb751f214 <__PRETTY_FUNCTION__.6829> "open_input_source") at assert.c:101
  [Error: assert.c was not found in source tree]
#5  0xb751ddfa in open_input_source (backend=<optimized out>, input_source=<optimized out>) at ./plugin.c:695
  [Error: ./plugin.c was not found in source tree]
#6  open_input_source (backend=0x0, input_source=0x8c38688) at ./plugin.c:690
  [Error: ./plugin.c was not found in source tree]
#7  0xb751dec3 in on_input_source_disconnected (input_source=0x8c38688) at ./plugin.c:686
  [Error: ./plugin.c was not found in source tree]
#8  0xb7798cf9 in ply_event_loop_handle_disconnect_for_source (source=0x8c37968, loop=0x8c2f0b0) at ply-event-loop.c:1089
  1084: 
  1085:       if (destination->disconnected_handler != NULL)
  1086:         {
  1087:           ply_trace ("calling disconnected_handler %p for fd %d",
  1088:                      destination->disconnected_handler, source->fd);
  1089:           destination->disconnected_handler (destination->user_data, source->fd);
  1090: 
  1091:           ply_trace ("done calling disconnected_handler %p for fd %d",
  1092:                      destination->disconnected_handler, source->fd);
  1093:         }
  1094: 
#9  ply_event_loop_disconnect_source (source=0x8c37968, loop=0x8c2f0b0) at ply-event-loop.c:1189
  1184: static void
  1185: ply_event_loop_disconnect_source (ply_event_loop_t           *loop,
  1186:                                   ply_event_source_t         *source)
  1187: {
  1188:   ply_trace ("disconnecting source with fd %d", source->fd);
  1189:   ply_event_loop_handle_disconnect_for_source (loop, source);
  1190:   ply_trace ("done disconnecting source with fd %d", source->fd);
  1191: 
  1192:   /* at this point, we've told the event loop users about the
  1193:    * fd disconnection, so we can invalidate any outstanding
  1194:    * watches and free the destinations.
#10 ply_event_loop_process_pending_events (loop=loop@entry=0x8c2f0b0) at ply-event-loop.c:1333
  1328:             is_disconnected = true;
  1329:         }
  1330: 
  1331:       if (is_disconnected)
  1332:         {
  1333:           ply_event_loop_disconnect_source (loop, source);
  1334:         }
  1335:       else if (ply_event_loop_source_has_met_status (source, status))
  1336:         ply_event_loop_handle_met_status_for_source (loop, source, status);
  1337: 
  1338:       if (loop->should_exit)
#11 0xb77994c8 in ply_event_loop_run (loop=0x8c2f0b0) at ply-event-loop.c:1368
  1363: 
  1364: int
  1365: ply_event_loop_run (ply_event_loop_t *loop)
  1366: {
  1367:   while (!loop->should_exit)
  1368:     ply_event_loop_process_pending_events (loop);
  1369: 
  1370:   ply_event_loop_run_exit_closures (loop);
  1371:   ply_event_loop_free_sources (loop);
  1372:   ply_event_loop_free_timeout_watches (loop);
  1373: 
#12 0x0804ba93 in main (argc=3, argv=0xbffe4034) at main.c:2561
  2556:       ply_error ("plymouthd: could not tell parent to exit: %m");
  2557:       return EX_UNAVAILABLE;
  2558:     }
  2559: 
  2560:   ply_trace ("entering event loop");
  2561:   exit_code = ply_event_loop_run (state.loop);
  2562:   ply_trace ("exited event loop");
  2563: 
  2564:   ply_boot_splash_free (state.boot_splash);
  2565:   state.boot_splash = NULL;
  2566: