Program received signal SIGSEGV, Segmentation fault.
adjust_rates (u=0x7cf7b0) at modules/module-combine-sink.c:219
219             uint32_t current_rate = o->sink_input->sample_spec.rate;

(gdb) bt full
#0  adjust_rates (u=0x7cf7b0) at modules/module-combine-sink.c:219
        new_rate = 44100
        current_rate = <optimized out>
        min_total_latency = <optimized out>
        avg_total_latency = <optimized out>
        n = <optimized out>
        o = 0x804700
        max_sink_latency = <optimized out>
        target_latency = 19956
        base_rate = 44100
        idx = 3
#1  time_callback (a=a@entry=0x63d418, e=e@entry=0x819d60, t=<optimized out>, userdata=userdata@entry=0x7cf7b0) at modules/module-combine-sink.c:253
        u = 0x7cf7b0
        __func__ = "time_callback"
        __PRETTY_FUNCTION__ = "time_callback"
#2  0x00007ffff7921787 in dispatch_timeout (m=0x63d3c0) at pulse/mainloop.c:759
        tv = {tv_sec = 48583, tv_usec = 1073790567}
        e = 0x819d60
        now = 48583048825
        r = 0
#3  pa_mainloop_dispatch (m=m@entry=0x63d3c0) at pulse/mainloop.c:897
        dispatched = 0
        __func__ = "pa_mainloop_dispatch"
        __PRETTY_FUNCTION__ = "pa_mainloop_dispatch"
#4  0x00007ffff7921a6a in pa_mainloop_iterate (m=m@entry=0x63d3c0, block=block@entry=1, retval=retval@entry=0x7fffffffe368) at pulse/mainloop.c:934
        r = <optimized out>
        __func__ = "pa_mainloop_iterate"
        __PRETTY_FUNCTION__ = "pa_mainloop_iterate"
#5  0x00007ffff7921b10 in pa_mainloop_run (m=m@entry=0x63d3c0, retval=retval@entry=0x7fffffffe368) at pulse/mainloop.c:949
        r = <optimized out>
#6  0x0000000000406ca1 in main (argc=<optimized out>, argv=<optimized out>) at daemon/main.c:1145
        c = 0x646750
        buf = <optimized out>
        conf = 0x63cde0
        mainloop = 0x63d3c0
        s = <optimized out>
        configured_address = 0x646750 "\001"
        r = <optimized out>
        retval = 0
        d = 1
        valid_pid_file = true
        ltdl_init = true
        passed_fd = <optimized out>
        e = <optimized out>
        daemon_pipe = {-1, -1}
        daemon_pipe2 = {-1, -1}
        autospawn_fd = -1
        autospawn_locked = false
        server_lookup = 0x64c160
        lookup_service_bus = 0x7083e0
        server_bus = 0x7083e0
        start_server = <optimized out>
        __func__ = "main"
        __PRETTY_FUNCTION__ = "main"

(gdb) i f
Stack level 0, frame at 0x7fffffffe250:
 rip = 0x7fffcf5e293f in adjust_rates (modules/module-combine-sink.c:219); saved rip 0x7ffff7921787
 inlined into frame 1
 source language c.
 Arglist at unknown address.
 Locals at unknown address, Previous frame's sp in rsp

(gdb) list
214
215         base_rate = u->sink->sample_spec.rate;
216
217         PA_IDXSET_FOREACH(o, u->outputs, idx) {
218             uint32_t new_rate = base_rate;
219             uint32_t current_rate = o->sink_input->sample_spec.rate;
220
221             if (!o->sink_input || !PA_SINK_IS_OPENED(pa_sink_get_state(o->sink)))
222                 continue;
223

(gdb) p *o
$1 = {userdata = 0x7cf7b0, sink = 0x807880, sink_input = 0x0, ignore_state_change = false, inq = 0x804780, outq = 0x8047b0, inq_rtpoll_item_read = 0x0, inq_rtpoll_item_write = 0x0, 
  outq_rtpoll_item_read = 0x0, outq_rtpoll_item_write = 0x0, memblockq = 0x8047e0, total_latency = 0, max_request = {value = 0}, requested_latency = {value = 0}, next = 0x0, prev = 0x0}

(gdb) p o->sink_input
$2 = (pa_sink_input *) 0x0