So I think I've come up with a reliable way to reproduce this by placing a corrupted yaml file in /var/lib/app-info.
Here is the file I placed (notice the extra s at the start): s--- File: DEP-11 MediaBaseUrl: http://appstream.ubuntu.com/media/main Origin: ubuntu-xenial-backports-main Priority: 40 Time: '2016-07-28T18:38:36.877230+00:00' Version: '0.8' By running fwupd with that in place, it hangs and pegs at 100% CPU. The BT of course isn't too surprising where it's hung: #0 0x00007ffff4249b6f in yaml_parser_parse () from /usr/lib/x86_64-linux-gnu/libyaml-0.so.2 #1 0x00007ffff779e5eb in as_node_yaml_process_layer (parser=parser@entry=0x7fffffffe030, parent=parent@entry=0x555555832c40) at as-yaml.c:225 #2 0x00007ffff779eae0 in as_yaml_from_file (file=file@entry=0x555555830560, cancellable=cancellable@entry=0x0, error=error@entry=0x7fffffffe340) at as-yaml.c:371 #3 0x00007ffff7799481 in as_store_load_yaml_file (error=0x7fffffffe340, cancellable=0x0, file=0x555555830560, store=0x555555795880) at as-store.c:1129 #4 as_store_from_file_internal (store=store@entry=0x555555795880, file=file@entry=0x555555830560, id_prefix=id_prefix@entry=0x7ffff77a29ae "system", cancellable=cancellable@entry=0x0, error=error@entry=0x7fffffffe340) at as-store.c:1371 #5 0x00007ffff7799ab7 in as_store_load_app_info_file (error=0x7fffffffe340, cancellable=0x0, path_xml=0x555555798460 "/var/lib/app-info/yaml/yaml.yml", id_prefix=0x7ffff77a29ae "system", store=0x555555795880) at as-store.c:2068 #6 as_store_load_app_info (store=store@entry=0x555555795880, id_prefix=id_prefix@entry=0x7ffff77a29ae "system", path=path@entry=0x555555798490 "/var/lib/app-info/yaml", flags=flags@entry=AS_STORE_LOAD_FLAG_APP_INFO_SYSTEM, cancellable=cancellable@entry=0x0, error=error@entry=0x7fffffffe4d8) at as-store.c:2118 #7 0x00007ffff779a131 in as_store_search_app_info (store=store@entry=0x555555795880, flags=flags@entry=AS_STORE_LOAD_FLAG_APP_INFO_SYSTEM, id_prefix=id_prefix@entry=0x7ffff77a29ae "system", path=path@entry=0x555555798430 "/var/lib/app-info", cancellable=cancellable@entry=0x0, error=error@entry=0x7fffffffe4d8) at as-store.c:2333 #8 0x00007ffff779abe4 in as_store_search_per_system (error=<optimized out>, cancellable=0x0, flags=<optimized out>, store=<optimized out>) at as-store.c:2535 #9 as_store_load (store=<optimized out>, flags=<optimized out>, cancellable=0x0, error=<optimized out>) at as-store.c:2683 #10 0x000055555555d9c7 in main () -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to appstream-glib in Ubuntu. https://bugs.launchpad.net/bugs/1591868 Title: fwupd consuming 100% CPU Status in appstream-glib package in Ubuntu: Confirmed Status in fwupd package in Ubuntu: Incomplete Bug description: fwupd process has been consuming 100% of my CPU for several days now (IBM Thinkpad x250 running fully updated 16.04). gdb backtrace below. Thread 2 (Thread 0x7f3272cf5700 (LWP 4496)): #0 0x00007f3279b79e8d in poll () at ../sysdeps/unix/syscall-template.S:84 No locals. #1 0x00007f327ae9331c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #2 0x00007f327ae9342c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #3 0x00007f327ae93469 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #4 0x00007f327aeb9b45 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0 No symbol table info available. #5 0x00007f3279e4f6fa in start_thread (arg=0x7f3272cf5700) at pthread_create.c:333 __res = <optimized out> pd = 0x7f3272cf5700 now = <optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139854651283200, 418179942412000561, 0, 140731891236207, 139854651283904, 0, -312637405101744847, -312613451844084431}, mask_was_saved = 0}}, priv = {pad = { 0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = <optimized out> pagesize_m1 = <optimized out> sp = <optimized out> freesize = <optimized out> __PRETTY_FUNCTION__ = "start_thread" #6 0x00007f3279b85b5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 No locals. Thread 1 (Thread 0x7f327c926900 (LWP 4486)): #0 0x00007f3279e542b7 in __GI___pthread_rwlock_rdlock (rwlock=0x7f3279e43920 <__libc_setlocale_lock>) at pthread_rwlock_rdlock.c:135 result = 0 wake = false #1 0x00007f3279aaf0e9 in __dcigettext (domainname=0x7f327aedee63 "glib20", msgid1=0x7f327b4ca11a "Invalid compressed data", msgid2=0x0, plural=0, n=0, category=5) at dcigettext.c:527 __p = <optimized out> domain = <optimized out> binding = <optimized out> categoryname = <optimized out> categoryvalue = <optimized out> dirname = <optimized out> xdomainname = <optimized out> single_locale = <optimized out> retval = <optimized out> retlen = 93892446493824 saved_errno = 0 search = {domainname = 0x7ffeb262bb00 "`\234\353\teU", category = 166588464, localename = 0x556509ededa8 "p\362\355\teU", counter = 166589040, domain = 0x23, translation = 0x5565fffffffb <error: Cannot access memory at address 0x5565fffffffb>, translation_length = 93892446493792, msgid = {appended = 0x7ffeb262bb08 "", ptr = 0x52fb0a5631f15a00 <error: Cannot access memory at address 0x52fb0a5631f15a00>}} foundp = 0x0 localename = <optimized out> domainname_len = <optimized out> #2 0x00007f327b44338c in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0 No symbol table info available. #3 0x00007f327b3e95f9 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0 No symbol table info available. #4 0x00007f327b40d315 in g_input_stream_read () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0 No symbol table info available. #5 0x00007f327c1ae569 in ?? () from /usr/lib/x86_64-linux-gnu/libappstream-glib.so.8 No symbol table info available. #6 0x00007f3278c51a15 in ?? () from /usr/lib/x86_64-linux-gnu/libyaml-0.so.2 No symbol table info available. #7 0x00007f3278c51cde in yaml_parser_update_buffer () from /usr/lib/x86_64-linux-gnu/libyaml-0.so.2 No symbol table info available. #8 0x00007f3278c56498 in yaml_parser_fetch_more_tokens () from /usr/lib/x86_64-linux-gnu/libyaml-0.so.2 No symbol table info available. #9 0x00007f3278c5b32f in yaml_parser_parse () from /usr/lib/x86_64-linux-gnu/libyaml-0.so.2 No symbol table info available. #10 0x00007f327c1ae39b in ?? () from /usr/lib/x86_64-linux-gnu/libappstream-glib.so.8 No symbol table info available. #11 0x00007f327c1ae890 in as_yaml_from_file () from /usr/lib/x86_64-linux-gnu/libappstream-glib.so.8 No symbol table info available. #12 0x00007f327c1a9231 in ?? () from /usr/lib/x86_64-linux-gnu/libappstream-glib.so.8 No symbol table info available. #13 0x00007f327c1a9867 in ?? () from /usr/lib/x86_64-linux-gnu/libappstream-glib.so.8 No symbol table info available. #14 0x00007f327c1a9ee1 in ?? () from /usr/lib/x86_64-linux-gnu/libappstream-glib.so.8 No symbol table info available. #15 0x00007f327c1aa994 in as_store_load () from /usr/lib/x86_64-linux-gnu/libappstream-glib.so.8 No symbol table info available. #16 0x00005565094a59c7 in main () No symbol table info available. 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