Using Debian Sid/unstable with PulseAudio package 6.0-5 [1], there is a core dump file in the folder for the GDM user with id 130: /var/crash/130/….

Loading this file in GDB, the backtrace below is acquired.

Reading symbols from /usr/bin/pulseaudio...Reading symbols from /usr/lib/debug/.build-id/49/7c525ca9e10c38f52b7a4251218c72ae09fb17.debug...done.
done.
(gdb) core-file ~/coredumps/8783-130-141-6-1439879689-mattotaupa--usr-bin-pulseaudio.core 
[New LWP 8783]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/i686/cmov/libthread_db.so.1".
Core was generated by `/usr/bin/pulseaudio --start --log-target=syslog'.
Program terminated with signal SIGABRT, Aborted.
#0  0xb7795be0 in __kernel_vsyscall ()
(gdb) bt f
#0  0xb7795be0 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb72da307 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = <optimized out>
        resultvar = <optimized out>
        pid = -1220206592
        selftid = 8783
#2  0xb72db9c3 in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0xb6c5b760, sa_sigaction = 0xb6c5b760}, sa_mask = {__val = {1, 3076117836, 0, 
              158200128, 4959397, 86318592, 158241392, 1, 3076231545, 3076591616, 158218576, 158200128, 158214384, 3076230544, 0, 
              3077070680, 206, 3077071544, 3077049224, 3219345652, 3076117801, 3076591616, 158219120, 3076230502, 3077337088, 3076740824, 
              0, 3077070680, 206, 3077071544, 3077049224, 3077071016}}, sa_flags = -1217896616, sa_restorer = 0xce}
        sigs = {__val = {32, 0 <repeats 31 times>}}
#3  0xb76356e0 in core_free (o=0x96df140) at pulsecore/core.c:179
        j = <optimized out>
        __func__ = "core_free"
        __PRETTY_FUNCTION__ = "core_free"
#4  0xb763a7c5 in pa_object_unref (o=0x96df140) at pulsecore/object.c:62
        __func__ = "pa_object_unref"
        __PRETTY_FUNCTION__ = "pa_object_unref"
#5  0x0804cf12 in pa_core_unref (o=0x96df140) at ./pulsecore/core.h:202
No locals.
#6  main (argc=3, argv=0xbfe35374) at daemon/main.c:1162
        c = <optimized out>
        buf = <optimized out>
        conf = 0x96d88c0
        mainloop = <optimized out>
        s = <optimized out>
        configured_address = 0x1 <error: Cannot access memory at address 0x1>
        r = <optimized out>
        retval = 0
        d = 3
        valid_pid_file = <optimized out>
        ltdl_init = true
        n_fds = <optimized out>
        passed_fds = <optimized out>
        e = <optimized out>
        daemon_pipe = {-1, -1}
        daemon_pipe2 = {-1, -1}
        autospawn_fd = <optimized out>
        autospawn_locked = <optimized out>
        server_lookup = <optimized out>
        lookup_service_bus = <optimized out>
        server_bus = <optimized out>
        start_server = <optimized out>
        __func__ = "main"
        __PRETTY_FUNCTION__ = "main"
(gdb) info reg
eax            0x0	0
ecx            0x224f	8783
edx            0x6	6
ebx            0x224f	8783
esp            0xbfe34fc4	0xbfe34fc4
ebp            0x96e28f0	0x96e28f0
esi            0x96e3950	158218576
edi            0xb7452000	-1220206592
eip            0xb7795be0	0xb7795be0 <__kernel_vsyscall+16>
eflags         0x202	[ IF ]
cs             0x73	115
ss             0x7b	123
ds             0x7b	123
es             0x7b	123
fs             0x0	0
gs             0x33	51

[1] http://metadata.ftp-master.debian.org/changelogs//main/p/pulseaudio/pulseaudio_6.0-5_changelog