Description of problem:
Seems to occur regularly in the background; I suspect it occurs when GNOME attempts to check for updates, and this is why we're not seeing update notifications on F23.

Note: F23 packages are not currently 100% signed, which I guess could conceivably be related.

Version-Release number of selected component:
PackageKit-1.0.7-1.fc23

Additional info:
reporter:       libreport-2.6.2
backtrace_rating: 4
cmdline:        /usr/libexec/packagekitd
crash_function: hy_repo_get_string
executable:     /usr/libexec/packagekitd
global_pid:     2369
kernel:         4.2.0-0.rc3.git3.1.fc23.x86_64
runlevel:       N 5
type:           CCpp
uid:            0

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 hy_repo_get_string at /usr/src/debug/hawkey-0.5.9/py3/src/repo.c:200
 #1 load_yum_repo at /usr/src/debug/hawkey-0.5.9/py3/src/sack.c:552
 #2 hy_sack_load_repo at /usr/src/debug/hawkey-0.5.9/py3/src/sack.c:999
 #3 hy_sack_load_yum_repo at /usr/src/debug/hawkey-0.5.9/py3/src/sack.c:992
 #4 hif_sack_add_source at hif-sack.c:148
 #5 hif_sack_add_sources at hif-sack.c:201
 #6 hif_utils_add_remote at pk-backend-hif.c:490
 #7 hif_utils_create_sack_for_filters at pk-backend-hif.c:686
 #8 pk_backend_search_thread at pk-backend-hif.c:909
 #9 pk_backend_job_thread_setup at pk-backend-job.c:815