Comment 1 for bug 1718118

(gdb) bt
#0 0x00003fffb24beff0 in raise () at /lib64/libc.so.6
#1 0x00003fffb24c136c in abort () at /lib64/libc.so.6
#2 0x00003fffb2bcaa04 in g_assertion_message () at /lib64/libglib-2.0.so.0
#3 0x00003fffb2bcab0c in g_assertion_message_expr () at /lib64/libglib-2.0.so.0
#4 0x00000000101b85a0 in spapr_drc_detach (drc=0x2fc31220) at /home/nasastry/qemu/hw/ppc/spapr_drc.c:417
#5 0x00000000101972e0 in spapr_memory_unplug_request (hotplug_dev=0x2faa60b0, dev=0x2fb8fb10, errp=0x3fffe92bfa90) at /home/nasastry/qemu/hw/ppc/spapr.c:3084
#6 0x000000001019856c in spapr_machine_device_unplug_request (hotplug_dev=0x2faa60b0, dev=0x2fb8fb10, errp=0x3fffe92bfa90)
    at /home/nasastry/qemu/hw/ppc/spapr.c:3354
#7 0x00000000104461a8 in hotplug_handler_unplug_request (plug_handler=0x2faa60b0, plugged_dev=0x2fb8fb10, errp=0x3fffe92bfa90) at hw/core/hotplug.c:45
#8 0x000000001036e15c in qdev_unplug (dev=0x2fb8fb10, errp=0x3fffe92bfa90) at qdev-monitor.c:878
#9 0x000000001036e1e4 in qmp_device_del (id=0x2fab2880 "dimm0", errp=0x3fffe92bfa90) at qdev-monitor.c:888
#10 0x000000001038975c in qmp_marshal_device_del (args=0x30658db0, ret=0x3fffe92bfb50, errp=0x3fffe92bfb48) at qmp-marshal.c:1462
#11 0x000000001081fd98 in do_qmp_dispatch (cmds=0x10c0e078 <qmp_commands>, request=0x3093ebf0, errp=0x3fffe92bfbc0) at qapi/qmp-dispatch.c:104
#12 0x000000001081ff84 in qmp_dispatch (cmds=0x10c0e078 <qmp_commands>, request=0x3093ebf0) at qapi/qmp-dispatch.c:131
#13 0x00000000100983dc in handle_qmp_command (parser=0x2fae1e80, tokens=0x2faa44e0) at /home/nasastry/qemu/monitor.c:3852
#14 0x000000001082aef0 in json_message_process_token (lexer=0x2fae1e88, input=0x2faa2420, type=JSON_RCURLY, x=70, y=374) at qobject/json-streamer.c:105
#15 0x000000001086d5d0 in json_lexer_feed_char (lexer=0x2fae1e88, ch=125 '}', flush=false) at qobject/json-lexer.c:323
#16 0x000000001086d7c4 in json_lexer_feed (lexer=0x2fae1e88, buffer=0x3fffe92bff88 "}", size=1) at qobject/json-lexer.c:373
#17 0x000000001082b004 in json_message_parser_feed (parser=0x2fae1e80, buffer=0x3fffe92bff88 "}", size=1) at qobject/json-streamer.c:124
#18 0x000000001009863c in monitor_qmp_read (opaque=0x2fae1df0, buf=0x3fffe92bff88 "}", size=1) at /home/nasastry/qemu/monitor.c:3894
#19 0x000000001078e3c8 in qemu_chr_be_write_impl (s=0x2fab36b0, buf=0x3fffe92bff88 "}", len=1) at chardev/char.c:167
#20 0x000000001078e484 in qemu_chr_be_write (s=0x2fab36b0, buf=0x3fffe92bff88 "}", len=1) at chardev/char.c:179
#21 0x000000001079a910 in tcp_chr_read (chan=0x2fbfbbc0, cond=G_IO_IN, opaque=0x2fab36b0) at chardev/char-socket.c:441
#22 0x00000000107be3d4 in qio_channel_fd_source_dispatch (source=0x2fab4770, callback=0x1079a760 <tcp_chr_read>, user_data=0x2fab36b0) at io/channel-watch.c:84
#23 0x00003fffb2b93ab0 in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#24 0x0000000010837e9c in glib_pollfds_poll () at util/main-loop.c:213
#25 0x0000000010838064 in os_host_main_loop_wait (timeout=-1) at util/main-loop.c:261
#26 0x000000001083818c in main_loop_wait (nonblocking=0) at util/main-loop.c:515
#27 0x00000000103771c4 in main_loop () at vl.c:1999
#28 0x0000000010381828 in main (argc=54, argv=0x3fffe92c1988, envp=0x3fffe92c1b40) at vl.c:4877