I can always reproduce this bug on appstream 0.9.4-1. It happens either during apt-get update, appstreamcli refresh or appstreamcli refresh --force.
I installed appstream-dbgsym and libappstream3-dbgsym and ran the program under gdb. The following is the backtrace I got: Program received signal SIGABRT, Aborted. 0x00007ffff601e478 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55 55 ../sysdeps/unix/sysv/linux/raise.c: No existe el fichero o el directorio. (gdb) bt #0 0x00007ffff601e478 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55 #1 0x00007ffff601f8fa in __GI_abort () at abort.c:89 #2 0x00007ffff605cfea in __libc_message (do_abort=do_abort@entry=2, fmt=fmt@entry=0x7ffff6154cd8 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175 #3 0x00007ffff6062936 in malloc_printerr (action=3, str=0x7ffff6154e30 "double free or corruption (fasttop)", ptr=<optimized out>, ar_ptr=<optimized out>) at malloc.c:5000 #4 0x00007ffff606311e in _int_free (av=0x7ffff6389b20 <main_arena>, p=<optimized out>, have_lock=0) at malloc.c:3861 #5 0x00007ffff6fd5599 in as_component_refine_icons (icon_paths=0x623ab0, cpt=0xeb3290) at /build/appstream-0.9.4/src/as-component.c:1814 #6 as_component_complete (cpt=0xeb3290, scr_base_url=<optimized out>, icon_paths=0x623ab0) at /build/appstream-0.9.4/src/as-component.c:1882 #7 0x00007ffff6fd678a in as_data_pool_add_new_component (cpt=0xeb3290, dpool=0x62b080) at /build/appstream-0.9.4/src/as-data-pool.c:201 #8 as_data_pool_load_metadata (dpool=<optimized out>) at /build/appstream-0.9.4/src/as-data-pool.c:477 #9 as_data_pool_update (dpool=<optimized out>, error=error@entry=0x7fffffffe260) at /build/appstream-0.9.4/src/as-data-pool.c:512 #10 0x00007ffff6fcbaf2 in as_cache_builder_refresh (builder=builder@entry=0x62b030, force=force@entry=1, error=error@entry=0x7fffffffe350) at /build/appstream-0.9.4/src/as-cache-builder.c:537 #11 0x0000000000404a1e in ascli_refresh_cache (dbpath=0x0, datapath=0x0, forced=1) at /build/appstream-0.9.4/tools/ascli-actions-mdata.c:60 #12 0x0000000000403d2b in as_client_run (argv=0x7fffffffe6a8, argc=2) at /build/appstream-0.9.4/tools/appstream-cli.c:160 #13 0x00007ffff600b610 in __libc_start_main (main=0x4034d0 <main>, argc=3, argv=0x7fffffffe6a8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffe698) at libc-start.c:291 #14 0x0000000000403559 in _start ()
