.
Thread 3 (LWP 4921):
#0  0xb7750424 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb74b0b2b in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#2  0xb761c20b in poll (__timeout=-1, __nfds=1, __fds=0x89e5db0) at /usr/include/i386-linux-gnu/bits/poll2.h:46
No locals.
#3  g_poll (fds=fds@entry=0x89e5db0, nfds=nfds@entry=1, timeout=timeout@entry=-1) at /build/buildd/glib2.0-2.39.91/./glib/gpoll.c:124
No locals.
#4  0xb760d3e8 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x89e5db0, timeout=-1, context=0x89d1ca0) at /build/buildd/glib2.0-2.39.91/./glib/gmain.c:4028
        poll_func = 0xb761c1e0 <g_poll>
#5  g_main_context_iterate (context=0x89d1ca0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.39.91/./glib/gmain.c:3729
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 1
        allocated_nfds = <optimized out>
        fds = 0x89e5db0
#6  0xb760d76b in g_main_loop_run (loop=0x89e64e8) at /build/buildd/glib2.0-2.39.91/./glib/gmain.c:3928
        __FUNCTION__ = "g_main_loop_run"
#7  0xb75b2b54 in call_sync_block (data=0x89e5dc0) at polkitauthority.c:610
No locals.
#8  polkit_authority_check_authorization_sync (authority=authority@entry=0x89c6400, subject=subject@entry=0x89c5000, action_id=action_id@entry=0x89d1d18 "com.ubuntu.pkexec.synaptic", details=details@entry=0x89e2ad0, flags=flags@entry=POLKIT_CHECK_AUTHORIZATION_FLAGS_ALLOW_USER_INTERACTION, cancellable=cancellable@entry=0x0, error=error@entry=0xbfa82c20) at polkitauthority.c:1021
        ret = <optimized out>
        data = 0x89e5dc0
        __FUNCTION__ = "polkit_authority_check_authorization_sync"
#9  0x0804a57d in main (argc=2, argv=0xbfa84d44) at pkexec.c:736
        n = <optimized out>
        ret = 127
        rc = <optimized out>
        opt_show_help = <optimized out>
        opt_show_version = <optimized out>
        opt_disable_internal_agent = <optimized out>
        authority = <optimized out>
        result = 0x0
        subject = <optimized out>
        details = 0x89e2ad0
        error = 0x0
        action_id = <optimized out>
        allow_gui = <optimized out>
        exec_argv = 0xbfa84d48
        path = 0x89c0548 "/usr/sbin/synaptic"
        pwstruct = {pw_name = 0xbfa82c8c "root", pw_passwd = 0xbfa82c91 "x", pw_uid = 0, pw_gid = 0, pw_gecos = 0xbfa82c97 "root", pw_dir = 0xbfa82c9c "/root", pw_shell = 0xbfa82ca2 "/bin/bash"}
        pwbuf = "root\000x\000\060:0:root\000/root\000/bin/bash", '\000' <repeats 5538 times>, "p\027\267\254B\250\277\000 w\267\000p\027\267\343su\267ha\027\267\000\000\000\000\340\000\000\000\022\b\000\000\003\000\000\000\000`\000\000\n\000\000\000Tfv\267\000\000\000\000\000\020\000\000\003\000\000\000\"\000\000\000\377\377\377\377\000\000\000\000\000p\000\000\030i\000\000\030i\000\000\000\000\000\000\005\000\000\000\000p\000\000\000\220\000\000h\201\000\000H\202\000\000\000`\000\000\003\000\000\000\000p\027\267/\000\000\000\363fv\267\b\000\000\000\037\000\000\000\fx\001\000\000\060\001\000\000 w\267\000\000\000\000\000 w\267\202\271u\267xr\027\267X\017\036\267\037\000\000\000\000\000\002\000\000 w\267\000\000\000\000\v"...
        s = <optimized out>
        environment_variables_to_save = {0x804b148 "SHELL", 0x804b14e "LANG", 0x804b153 "LINGUAS", 0x804b15b "LANGUAGE", 0x804b164 "LC_COLLATE", 0x804b16f "LC_CTYPE", 0x804b178 "LC_MESSAGES", 0x804b184 "LC_MONETARY", 0x804b190 "LC_NUMERIC", 0x804b19b "LC_TIME", 0x804b1a3 "LC_ALL", 0x804b1af "TERM", 0x804b1aa "COLORTERM", 0x804b1b4 "DISPLAY", 0x804b1bc "XAUTHORITY", 0x0}
        saved_env = 0x89c0600
        opt_user = 0x89c1e70 "root"
        pid_of_caller = <optimized out>
        local_agent_handle = 0x89ea2f0
        __FUNCTION__ = "main"
.
Thread 2 (LWP 4923):
#0  0xb7750424 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb74b0b2b in poll () at ../sysdeps/unix/syscall-template.S:81
No locals.
#2  0xb761c20b in poll (__timeout=-1, __nfds=2, __fds=0xb6803898) at /usr/include/i386-linux-gnu/bits/poll2.h:46
No locals.
#3  g_poll (fds=fds@entry=0xb6803898, nfds=nfds@entry=2, timeout=timeout@entry=-1) at /build/buildd/glib2.0-2.39.91/./glib/gpoll.c:124
No locals.
#4  0xb760d3e8 in g_main_context_poll (priority=2147483647, n_fds=2, fds=0xb6803898, timeout=-1, context=0x89cf5c8) at /build/buildd/glib2.0-2.39.91/./glib/gmain.c:4028
        poll_func = 0xb761c1e0 <g_poll>
#5  g_main_context_iterate (context=0x89cf5c8, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.39.91/./glib/gmain.c:3729
        max_priority = 2147483647
        timeout = -1
        some_ready = <optimized out>
        nfds = 2
        allocated_nfds = <optimized out>
        fds = 0xb6803898
#6  0xb760d76b in g_main_loop_run (loop=0x89cf590) at /build/buildd/glib2.0-2.39.91/./glib/gmain.c:3928
        __FUNCTION__ = "g_main_loop_run"
#7  0xb72c031a in _g_dbus_worker_unref (worker=0x0) at /build/buildd/glib2.0-2.39.91/./gio/gdbusprivate.c:454
No locals.
#8  0x00000000 in ?? ()
No symbol table info available.
.
Thread 1 (LWP 4924):
#0  0xb761440a in _g_log_abort (breakpoint=1) at /build/buildd/glib2.0-2.39.91/./glib/gmessages.c:308
No locals.
#1  g_logv (log_domain=log_domain@entry=0x0, log_level=log_level@entry=G_LOG_LEVEL_ERROR, format=format@entry=0xb75a62f8 "Got unexpected EOF while reading from controlling terminal.", args=args@entry=0xb67fefac "\002") at /build/buildd/glib2.0-2.39.91/./glib/gmessages.c:1033
        domain = 0x0
        data = 0x0
        depth = 1
        log_func = 0xb7613b10 <g_log_default_handler>
        domain_fatal_mask = <optimized out>
        masquerade_fatal = <optimized out>
        test_level = <optimized out>
        was_fatal = 0
        was_recursion = 0
        msg = 0xb5e03000 "Got unexpected EOF while reading from controlling terminal."
        msg_alloc = 0xb5e03000 "Got unexpected EOF while reading from controlling terminal."
        i = 2
#2  0xb7614523 in g_log (log_domain=log_domain@entry=0x0, log_level=log_level@entry=G_LOG_LEVEL_ERROR, format=format@entry=0xb75a62f8 "Got unexpected EOF while reading from controlling terminal.") at /build/buildd/glib2.0-2.39.91/./glib/gmessages.c:1071
        args = 0xb67fefac "\002"
#3  0xb75a4b26 in choose_identity (identities=0x89dc1d0, listener=0x89c5340) at polkitagenttextlistener.c:416
        c = <optimized out>
        str = 0x89dc1b0
        ret = 0x0
        l = <optimized out>
        n = <optimized out>
        num_identities = 2
        num = <optimized out>
        endp = 0xb6803790 "\350\360\234\b\001"
#4  polkit_agent_text_listener_initiate_authentication (_listener=0x89c5340, action_id=0xb5e01378 "com.ubuntu.pkexec.synaptic", message=0xb5e01393 "Authentication is required to run the Synaptic Package Manager", icon_name=0xb5e013d2 "synaptic", details=0x89dc200, cookie=0xb5e0140e "cookie1", identities=0x89dc1d0, cancellable=0xb6803790, callback=0xb75a4030 <auth_cb>, user_data=0xb5e02318) at polkitagenttextlistener.c:486
        listener = 0x89c5340
        simple = 0x89e7720
        identity = <optimized out>
        __FUNCTION__ = "polkit_agent_text_listener_initiate_authentication"
#5  0xb75a3be2 in polkit_agent_listener_initiate_authentication (listener=0x89c5340, action_id=0xb5e01378 "com.ubuntu.pkexec.synaptic", message=0xb5e01393 "Authentication is required to run the Synaptic Package Manager", icon_name=0xb5e013d2 "synaptic", details=details@entry=0x89dc200, cookie=0xb5e0140e "cookie1", identities=identities@entry=0x89dc1d0, cancellable=0xb6803790, callback=callback@entry=0xb75a4030 <auth_cb>, user_data=user_data@entry=0xb5e02318) at polkitagentlistener.c:786
        __FUNCTION__ = "polkit_agent_listener_initiate_authentication"
#6  0xb75a3e56 in auth_agent_handle_begin_authentication (invocation=0x89bd6c0, parameters=0xb6841b30, server=0x89ea2f0) at polkitagentlistener.c:673
        message = 0xb5e01393 "Authentication is required to run the Synaptic Package Manager"
        icon_name = 0xb5e013d2 "synaptic"
        cookie = 0xb5e0140e "cookie1"
        iter = {x = {144512048, 2, 2, 0, 144430792, 2, 3073034169, 3579507750, 3077585408, 3076858118, 3062112048, 3077718016, 3073137447, 3073773568, 144430784, 3073138393}}
        child = 0x0
        details_gvariant = 0x89d0918
        details = 0x89dc200
        n = <optimized out>
        data = 0xb5e02318
        action_id = 0xb5e01378 "com.ubuntu.pkexec.synaptic"
        identities_gvariant = 0x89d1430
        identities = 0x89dc1d0
#7  auth_agent_handle_method_call (connection=0x89ca000, sender=0xb68013c8 ":1.10", object_path=0xb6830280 "/org/freedesktop/PolicyKit1/AuthenticationAgent", interface_name=0xb6830418 "org.freedesktop.PolicyKit1.AuthenticationAgent", method_name=0xb68013f0 "BeginAuthentication", parameters=0xb6841b30, invocation=0x89bd6c0, user_data=0x89ea2f0) at polkitagentlistener.c:295
        server = 0x89ea2f0
#8  0xb72afe1f in call_in_idle_cb (user_data=0x89bd6c0) at /build/buildd/glib2.0-2.39.91/./gio/gdbusconnection.c:4868
        reply = 0xb75a3c10 <auth_agent_handle_method_call>
        invocation = 0x89bd6c0
        vtable = <optimized out>
        registration_id = <optimized out>
        subtree_registration_id = <optimized out>
        __FUNCTION__ = "call_in_idle_cb"
#9  0xb7609c50 in g_idle_dispatch (source=source@entry=0xb6802338, callback=0xb72afd10 <call_in_idle_cb+144>, user_data=0x89bd6c0) at /build/buildd/glib2.0-2.39.91/./glib/gmain.c:5319
No locals.
#10 0xb760d0a7 in g_main_dispatch (context=0xb5e00d80) at /build/buildd/glib2.0-2.39.91/./glib/gmain.c:3064
        dispatch = 0xb7609c30 <g_idle_dispatch>
        prev_source = 0x0
        was_in_call = 0
        user_data = 0x89bd6c0
        callback = 0xb72afd10 <call_in_idle_cb+144>
        cb_funcs = <optimized out>
        cb_data = 0xb68302d0
        need_destroy = <optimized out>
        source = 0xb6802338
        current = 0xb5e00d00
        i = 0
#11 g_main_context_dispatch (context=context@entry=0xb5e00d80) at /build/buildd/glib2.0-2.39.91/./glib/gmain.c:3663
No locals.
#12 0xb760d468 in g_main_context_iterate (context=0xb5e00d80, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.39.91/./glib/gmain.c:3734
        max_priority = 2147483647
        timeout = -1
        some_ready = 1
        nfds = 1
        allocated_nfds = <optimized out>
        fds = <optimized out>
#13 0xb760d76b in g_main_loop_run (loop=0xb5e00cf0) at /build/buildd/glib2.0-2.39.91/./glib/gmain.c:3928
        __FUNCTION__ = "g_main_loop_run"
#14 0xb75a3569 in server_thread_func (user_data=0x89ea2f0) at polkitagentlistener.c:362
        server = 0x89ea2f0
#15 0xb76339ca in g_thread_proxy (data=data@entry=0x89c6ef0) at /build/buildd/glib2.0-2.39.91/./glib/gthread.c:764
        thread = 0x89c6ef0
#16 0xb75de01d in g_deprecated_thread_proxy (data=0x89c6ef0) at /build/buildd/glib2.0-2.39.91/./glib/deprecated/gthread-deprecated.c:308
        real = 0x89c6ef0
#17 0xb7589f70 in start_thread (arg=0xb67ffb40) at pthread_create.c:312
        __res = <optimized out>
        pd = 0xb67ffb40
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {-1218854912, -1233126592, 4001536, -1233128536, 2127829068, 806323790}, 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"
#18 0xb74bfa6e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:129
No locals.