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NetworkManager 1.44.0 crashes repeatedly with glib 2.78.0

Summary

The main NetworkManager process crashes repeatedly with glib 2.78.0. It no longer reproduces after downgrading glib to 2.76.5. I'm reporting it here too because it remains unclear to me whether it's a problem in GLib or NetworkManager itself.

There are multiple reports for the same issue in my local Arch Linux user group.

Version affected

  • NetworkManager 1.44.0
  • GLib 2.78.0
  • Arch Linux x86_64

Steps to reproduce

  • Start NetworkManager service
  • It crashes randomly. The fastest one being a crash of 3 seconds after started and successfully connected to Wi-Fi.

Relevant logs

g_mutex_clear() called on uninitialised or locked mutex

Backtrace:

(gdb) bt full
#0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
        tid = <optimized out>
        ret = 0
        pd = <optimized out>
        old_mask = {__val = {140517133380192}}
        ret = <optimized out>
#1  0x00007fccb148e8a3 in __pthread_kill_internal (signo=6, threadid=<optimized out>) at pthread_kill.c:78
#2  0x00007fccb143e668 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
        ret = <optimized out>
#3  0x00007fccb14264b8 in __GI_abort () at abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x20, sa_sigaction = 0x20}, sa_mask = {__val = {56, 140517133380192, 56, 56, 140517124362049, 4, 140517126173920, 56, 56, 1, 140517133380192, 140517125771824, 140517124311762, 94657017546753, 94657010334544, 94656992549056}}, sa_flags = 216955008, sa_restorer = 0x56170de80868}
#4  0x00007fccb1caab23 in g_mutex_clear (mutex=<optimized out>) at ../glib/glib/gthread-posix.c:1450
#5  g_mutex_clear (mutex=mutex@entry=0x56170cee78a8) at ../glib/glib/gthread-posix.c:1445
#6  0x00007fccb1e4ebe0 in lookup_data_free (data=0x56170cee7880) at ../glib/gio/gthreadedresolver.c:251
        __func__ = "lookup_data_free"
#7  0x00007fccb1e5232f in g_task_finalize (object=0x56170de80860) at ../glib/gio/gtask.c:773
        task = 0x56170de80860
#8  0x00007fccb1d658b4 in g_object_unref (_object=0x56170de80860) at ../glib/gobject/gobject.c:3941
        weak_locations = <optimized out>
        nqueue = 0x56170d19e6b0
        old_ref = <optimized out>
        object = 0x56170de80860
        __func__ = "g_object_unref"
#9  g_object_unref (_object=0x56170de80860) at ../glib/gobject/gobject.c:3805
        object = 0x56170de80860
        __func__ = "g_object_unref"
#10 0x00007fccb1c4b92d in g_source_callback_unref (cb_data=0x7fcc98001bc0) at ../glib/glib/gmain.c:1758
        callback = 0x7fcc98001bc0
#11 g_source_callback_unref (cb_data=0x7fcc98001bc0) at ../glib/glib/gmain.c:1751
        callback = 0x7fcc98001bc0
#12 0x00007fccb1c4ff50 in g_source_destroy_internal (source=0x7fcc98017020, context=0x56170c6a9770, have_lock=1) at ../glib/glib/gmain.c:1423
        tmp_list = <optimized out>
        old_cb_data = 0x7fcc98001bc0
        old_cb_funcs = 0x7fccb1d41380 <g_source_callback_funcs>
#13 0x00007fccb1c51021 in g_main_dispatch (context=0x56170c6a9770) at ../glib/glib/gmain.c:3506
        dispatch = <optimized out>
        prev_source = 0x0
        begin_time_nsec = 14448646124337
        was_in_call = 0
        user_data = 0x56170de80860
        callback = 0x7fccb1e4ed10 <complete_in_idle_cb>
        cb_funcs = 0x7fccb1d41380 <g_source_callback_funcs>
        cb_data = 0x7fcc98001bc0
        need_destroy = 1
        source = 0x7fcc98017020
        current = 0x56170c6b2d40
        i = 0
        __func__ = "g_main_dispatch"
#14 0x00007fccb1caf2b7 in g_main_context_dispatch_unlocked (context=0x56170c6a9770) at ../glib/glib/gmain.c:4284
        max_priority = 2147483647
        timeout = 403
        some_ready = 1
        nfds = 10
        allocated_nfds = 11
        fds = 0x56170c6ebee0
        begin_time_nsec = 14448597199357
#15 g_main_context_iterate_unlocked.isra.0 (context=0x56170c6a9770, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/glib/gmain.c:4349
        max_priority = 2147483647
        timeout = 403
        some_ready = 1
        nfds = 10
        allocated_nfds = 11
        fds = 0x56170c6ebee0
        begin_time_nsec = 14448597199357
#16 0x00007fccb1c51b47 in g_main_loop_run (loop=0x56170c6a9830) at ../glib/glib/gmain.c:4551
        __func__ = "g_main_loop_run"
#17 0x000056170c089f28 in main (argc=<optimized out>, argv=<optimized out>) at ../NetworkManager/src/core/main.c:519
        success = 1
        manager = 0x56170c79eeb0
        config = <optimized out>
        error = 0x0
        wrote_pidfile = <optimized out>
        bad_domains = 0x0
        config_cli = 0x0
        sd_id = 324
        error_invalid_logging_config = 0x0
        warnings = <optimized out>
        errsv = <optimized out>
        has_logging = <optimized out>