failure to retrace may contain valuable information

Tiago was interested in the bucket which contains https://errors.ubuntu.com/oops/35d192ce-07c5-11e7-97a6-fa163e54c21f and sorting out what was going on. I searched the retracer log files and found the following information:

2017-03-30 03:03:35,135:35d192ce-07c5-11e7-97a6-fa163e54c21f:Processing.
2017-03-30 03:03:40,453:35d192ce-07c5-11e7-97a6-fa163e54c21f:Decompressing to /tmp/tmp3nUqqD-swift.35d192ce-07c5-11e7-97a6-fa163e54c21f.oopsid.core
2017-03-30 03:03:47,669:35d192ce-07c5-11e7-97a6-fa163e54c21f:Retracing 35d192ce-07c5-11e7-97a6-fa163e54c21f:swift with cache /srv/daisy.ubuntu.com/production/cache/Ubuntu 16.04/cache-RknbNs/cache
2017-03-30 03:09:39,339:35d192ce-07c5-11e7-97a6-fa163e54c21f:Writing back to Cassandra
2017-03-30 03:09:39,389:35d192ce-07c5-11e7-97a6-fa163e54c21f:Apport did not return a crash_signature.
2017-03-30 03:09:39,389:35d192ce-07c5-11e7-97a6-fa163e54c21f:UnreportableReason is: Les versions installées de certains paquets sont obsolètes. Veuillez mettre à niveau les paquets suivants, puis vérifier si le problème est toujours présent :
2017-03-30 03:09:39,390:35d192ce-07c5-11e7-97a6-fa163e54c21f:StacktraceTop:
2017-03-30 03:09:39,390:35d192ce-07c5-11e7-97a6-fa163e54c21f:?? ()
2017-03-30 03:09:39,390:35d192ce-07c5-11e7-97a6-fa163e54c21f:getX11InputMethodData (env=0x7f313832e1e0, imInstance=0x0) at /build/openjdk-8-YiEakL/openjdk-8-8u121-b13/src/jdk/src/solaris/native/sun/awt/awt_InputMethod.c:313
2017-03-30 03:09:39,390:35d192ce-07c5-11e7-97a6-fa163e54c21f:_XimServerDestroy (im_2_destroy=<optimized out>) at ../../../../modules/im/ximcp/imInt.c:106
2017-03-30 03:09:39,390:35d192ce-07c5-11e7-97a6-fa163e54c21f:_XimFilterServerDestroy (d=<optimized out>, w=<optimized out>, ev=<optimized out>, client_data=<optimized out>) at ../../../../modules/im/ximcp/imDefFlt.c:374
2017-03-30 03:09:39,390:35d192ce-07c5-11e7-97a6-fa163e54c21f:Java_sun_awt_X11_XlibWrapper_XFilterEvent (env=<optimized out>, clazz=<optimized out>, ptr=<optimized out>, window=<optimized out>) at /build/openjdk-8-YiEakL/openjdk-8-8u121-b13/src/jdk/src/solaris/native/sun/xawt/XlibWrapper.c:661
2017-03-30 03:09:39,395:35d192ce-07c5-11e7-97a6-fa163e54c21f:Could not retrace.
2017-03-30 03:09:39,395:35d192ce-07c5-11e7-97a6-fa163e54c21f:UnreportableReason is: Les versions installées de certains paquets sont obsolètes. Veuillez mettre à niveau les paquets suivants, puis vérifier si le problème est toujours présent :
2017-03-30 03:09:39,395:35d192ce-07c5-11e7-97a6-fa163e54c21f:RetraceOutdatedPackages:
2017-03-30 03:09:39,396:35d192ce-07c5-11e7-97a6-fa163e54c21f:no debug symbol package found for libflac8 (Ubuntu 16.04)
2017-03-30 03:09:40,111:35d192ce-07c5-11e7-97a6-fa163e54c21f:Done processing /tmp/tmp3nUqqD-swift.35d192ce-07c5-11e7-97a6-fa163e54c21f.oopsid

While apport did not return a crash signature we do still have a StacktraceTop with some information that may aid an investigation. It'd be good if this were written back to the OOPS.