Watch this:
(qemu) chardev-add file,path=foo2,id=foo2
(qemu) chardev-add file,path=foo3,id=foo3
(qemu) device_add id=gg,driver=pci-serial-2x,chardev1=foo2,chardev2=foo3
(qemu) device_del gg
(qemu) upstream-qemu: /work/armbru/qemu/memory.c:1259:
memory_region_finalize: Assertion `((&mr->subregions)->tqh_first == ((void
*)0))' failed.
Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffe2eb5700 (LWP 28433)]
0x00007fffedef2c39 in raise () from /lib64/libc.so.6
(gdb) bt
#0 0x00007fffedef2c39 in raise () from /lib64/libc.so.6
#1 0x00007fffedef4348 in abort () from /lib64/libc.so.6
#2 0x00007fffedeebb96 in __assert_fail_base () from /lib64/libc.so.6
#3 0x00007fffedeebc42 in __assert_fail () from /lib64/libc.so.6
#4 0x00005555556443cd in memory_region_finalize (obj=<optimized out>)
at /work/armbru/qemu/memory.c:1259
#5 0x000055555583fdca in object_deinit (type=<optimized out>,
obj=0x5555563ee328) at /work/armbru/qemu/qom/object.c:408
#6 object_finalize (data=0x5555563ee328) at
/work/armbru/qemu/qom/object.c:421
#7 object_unref (obj=0x5555563ee328) at /work/armbru/qemu/qom/object.c:729
#8 0x000055555578f598 in multi_serial_pci_exit (dev=0x5555563edae0)
at /work/armbru/qemu/hw/char/serial-pci.c:154
#9 0x00005555557e4730 in pci_unregister_device (dev=<optimized out>)
at /work/armbru/qemu/hw/pci/pci.c:909
#10 0x00005555557913d4 in device_unrealize (dev=0x5555563edae0,
errp=0x7fffe2eb48c0) at /work/armbru/qemu/hw/core/qdev.c:196
#11 0x000055555579288a in device_set_realized (obj=<optimized out>,
value=<optimized out>, errp=0x0) at /work/armbru/qemu/hw/core/qdev.c:885
#12 0x000055555583eefe in property_set_bool (obj=0x5555563edae0,
v=<optimized out>, opaque=0x5555563c01f0, name=<optimized out>,
errp=0x0)
at /work/armbru/qemu/qom/object.c:1473
#13 0x0000555555841837 in object_property_set_qobject (obj=0x5555563edae0,
value=<optimized out>, name=0x55555590e3d8 "realized", errp=0x0)
at /work/armbru/qemu/qom/qom-qobject.c:24
#14 0x0000555555840450 in object_property_set_bool (
obj=obj@entry=0x5555563edae0, value=value@entry=false,
name=name@entry=0x55555590e3d8 "realized", errp=errp@entry=0x0)
at /work/armbru/qemu/qom/object.c:888
#15 0x00005555557910db in device_unparent (obj=0x5555563edae0)
at /work/armbru/qemu/hw/core/qdev.c:1006
#16 0x00005555558400c5 in object_unparent (obj=0x5555563edae0)
at /work/armbru/qemu/qom/object.c:396
#17 0x000055555576e3b6 in acpi_pcihp_eject_slot (s=<optimized out>,
bsel=<optimized out>, slots=<optimized out>)
at /work/armbru/qemu/hw/acpi/pcihp.c:139
#18 0x0000555555640bba in access_with_adjusted_size (addr=addr@entry=8,
value=value@entry=0x7fffe2eb4ab0, size=size@entry=4,
access_size_min=<optimized out>, access_size_max=<optimized out>,
access=
0x555555640e60 <memory_region_write_accessor>, mr=0x5555563f5e78)
at /work/armbru/qemu/memory.c:481
#19 0x0000555555645897 in memory_region_dispatch_write (size=4, data=16,
addr=8, mr=0x5555563f5e78) at /work/armbru/qemu/memory.c:1143
#20 io_mem_write (mr=mr@entry=0x5555563f5e78, addr=8, val=<optimized out>,
size=4) at /work/armbru/qemu/memory.c:1976
#21 0x000055555560fad3 in address_space_rw (
as=0x555555d3ce80 <address_space_io>, addr=addr@entry=44552,
buf=0x7ffff7ff7000 "\020", len=len@entry=4,
is_write=is_write@entry=true)
at /work/armbru/qemu/exec.c:2054
#22 0x000055555563ff18 in kvm_handle_io (count=1, size=4,
direction=<optimized out>, data=<optimized out>, port=44552)
at /work/armbru/qemu/kvm-all.c:1597
#23 kvm_cpu_exec (cpu=cpu@entry=0x5555563aaee0)
at /work/armbru/qemu/kvm-all.c:1734
#24 0x000055555562e2e2 in qemu_kvm_cpu_thread_fn (arg=0x5555563aaee0)
at /work/armbru/qemu/cpus.c:874
#25 0x00007ffff6bc7f33 in start_thread () from /lib64/libpthread.so.0
#26 0x00007fffedfb1ded in clone () from /lib64/libc.so.6
