Comment 5 for bug 1583845

I noticed the same problem on a fresh 16.04 install. I booted it again few days later, and noticed "appstreamcli refresh" process using 100% cpu. Running strace on it doesn't show any activity. Gdb shows that it seems to be looping in as_yamldata_parse_distro_data ():

(gdb) bt
#0 0x00007eff42d03c4c in as_yamldata_parse_distro_data ()
   from /usr/lib/x86_64-linux-gnu/libappstream.so.3
#1 0x00007eff42d05537 in as_metadata_parse_yaml ()
   from /usr/lib/x86_64-linux-gnu/libappstream.so.3
#2 0x00007eff42d05c55 in as_metadata_parse_file ()
   from /usr/lib/x86_64-linux-gnu/libappstream.so.3
#3 0x00007eff42d08d49 in as_data_pool_update ()
   from /usr/lib/x86_64-linux-gnu/libappstream.so.3
#4 0x00007eff42cfe272 in as_cache_builder_refresh ()
   from /usr/lib/x86_64-linux-gnu/libappstream.so.3
#5 0x00000000004049de in ascli_refresh_cache ()
#6 0x0000000000403ceb in as_client_run ()
#7 0x00007eff4292c830 in __libc_start_main (main=0x403490 <main>, argc=2,
    argv=0x7ffc131f67c8, init=<optimized out>, fini=<optimized out>,
    rtld_fini=<optimized out>, stack_end=0x7ffc131f67b8)
    at ../csu/libc-start.c:291
#8 0x0000000000403519 in _start ()