Hi,

tracker-extract gets killed by seccomp when gstreamer tries to
regenerate cache.

According to Simon, one of the solution would be to set the
GST_REGISTRY_UPDATE=no environment variable.


           PID: 2501 (single)
           UID: 1000 (bigon)
           GID: 1000 (bigon)
        Signal: 31 (SYS)
     Timestamp: Mon 2017-01-30 14:36:05 CET (20h ago)
  Command Line: /usr/lib/tracker/tracker-extract
    Executable: /usr/lib/tracker/tracker-extract
 Control Group: /user.slice/user-1000.slice/session-2.scope
          Unit: session-2.scope
         Slice: user-1000.slice
       Session: 2
     Owner UID: 1000 (bigon)
       Boot ID: 4b419a7583b449b2b40498a9acb30531
    Machine ID: dc6ad158d1ff4556807c9ad567145678
      Hostname: valinor
       Storage: /var/lib/systemd/coredump/core.single.1000.4b419a7583b449b2b40498a9acb30531.2501.1485783365000000000000.lz4
       Message: Process 2501 (single) of user 1000 dumped core.
                
                Stack trace of thread 2501:
                #0  0x00007f402ccb0c47 __dup2 (libc.so.6)
                #1  0x00007f402d220bc4 sane_dup2 (libglib-2.0.so.0)
                #2  0x00007f402d220e33 do_exec (libglib-2.0.so.0)
                #3  0x00007f402d221a53 fork_exec_with_pipes (libglib-2.0.so.0)
                #4  0x00007f402d2224c5 g_spawn_async_with_pipes (libglib-2.0.so.0)
                #5  0x00007f4010de5e99 n/a (libgstreamer-1.0.so.0)
                #6  0x00007f4010de5fc1 n/a (libgstreamer-1.0.so.0)
                #7  0x00007f4010de6545 n/a (libgstreamer-1.0.so.0)
                #8  0x00007f4010def72c n/a (libgstreamer-1.0.so.0)
                #9  0x00007f4010df0891 n/a (libgstreamer-1.0.so.0)
                #10 0x00007f4010df0a66 n/a (libgstreamer-1.0.so.0)
                #11 0x00007f4010df26b4 gst_update_registry (libgstreamer-1.0.so.0)
                #12 0x00007f4010d8d20e n/a (libgstreamer-1.0.so.0)
                #13 0x00007f402d1e6b08 g_option_context_parse (libglib-2.0.so.0)
                #14 0x00007f4010d8dbdf gst_init_check (libgstreamer-1.0.so.0)
                #15 0x00007f4010d8dc34 gst_init (libgstreamer-1.0.so.0)
                #16 0x00007f40114e7916 n/a (libextract-gstreamer.so)
                #17 0x00007f40114e8dc9 tracker_extract_get_metadata (libextract-gstreamer.so)
                #18 0x000055baf7cce78c n/a (tracker-extract)
                #19 0x000055baf7ccedf3 n/a (tracker-extract)
                #20 0x000055baf7ccee50 n/a (tracker-extract)
                #21 0x00007f402d202345 g_thread_proxy (libglib-2.0.so.0)
                #22 0x00007f402cf7a424 start_thread (libpthread.so.0)
                #23 0x00007f402ccbd9bf __clone (libc.so.6)