Re: [Qemu-devel] [PATCH v7 1/4] hw/pci: introduce pcie-pci-bridge device

[Eduardo Habkost <ehabkost@redhat.com>]

On Wed, Sep 20, 2017 at 09:52:01AM +0000, Aleksandr Bezzubikov wrote:
> ср, 20 сент. 2017 г. в 10:13, Marcel Apfelbaum <marcel@redhat.com>:
> 
> > On 19/09/2017 23:34, Eduardo Habkost wrote:
> > > On Fri, Aug 18, 2017 at 02:36:47AM +0300, Aleksandr Bezzubikov wrote:
> > >> Introduce a new PCIExpress-to-PCI Bridge device,
> > >> which is a hot-pluggable PCI Express device and
> > >> supports devices hot-plug with SHPC.
> > >>
> > >> This device is intended to replace the DMI-to-PCI Bridge.
> > >>
> > >> Signed-off-by: Aleksandr Bezzubikov <zuban32s@gmail.com>
> > >> Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>
> > >
> > > It's possible to crash QEMU by instantiating this device, with;
> > >
> > >    $ qemu-system-ppc64 -machine prep -device pcie-pci-bridge
> > >    qemu-system-ppc64: qemu/memory.c:1533: memory_region_finalize:
> > Assertion `!mr->container' failed.
> > >    Aborted
> >
> > Hi Edurado,
> >
> > >
> > > I didn't investigate the root cause.
> > >
> >
> > Thanks for reporting it!
> > Aleksandr, can you have a look? Maybe we should not compile
> > the device for ppc arch. (x86 and arm is enough)
> 
> 
> I will see what can we do. Is x86 and arm really enough?

I would investigate the original cause before disabling the device on other
architectures, as we could be hiding a bug that's also present in x86.  The
backtrace looks like broken error handling logic somewhere:

#0  0x00007fffea9ff1f7 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1  0x00007fffeaa008e8 in __GI_abort () at abort.c:90
#2  0x00007fffea9f8266 in __assert_fail_base (fmt=0x7fffeab4ae68 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x555555be4ac1 "!mr->container", file=file@entry=0x555555be49c4 "/root/qemu/memory.c", line=line@entry=1533, function=function@entry=0x555555be5100 <__PRETTY_FUNCTION__.28908> "memory_region_finalize") at assert.c:92
#3  0x00007fffea9f8312 in __GI___assert_fail (assertion=assertion@entry=0x555555be4ac1 "!mr->container", file=file@entry=0x555555be49c4 "/root/qemu/memory.c", line=line@entry=1533, function=function@entry=0x555555be5100 <__PRETTY_FUNCTION__.28908> "memory_region_finalize") at assert.c:101
#4  0x00005555557ff2df in memory_region_finalize (obj=<optimized out>) at /root/qemu/memory.c:1533
#5  0x0000555555ae77a2 in object_unref (type=<optimized out>, obj=0x555557c00d80) at /root/qemu/qom/object.c:453
#6  0x0000555555ae77a2 in object_unref (data=0x555557c00d80) at /root/qemu/qom/object.c:467
#7  0x0000555555ae77a2 in object_unref (obj=0x555557c00d80) at /root/qemu/qom/object.c:902
#8  0x0000555555ae67d7 in object_property_del_child (obj=0x555557ab6500, child=child@entry=0x555557c00d80, errp=0x0) at /root/qemu/qom/object.c:427
#9  0x0000555555ae6ff4 in object_unparent (obj=obj@entry=0x555557c00d80) at /root/qemu/qom/object.c:446
#10 0x0000555555a1c94e in shpc_free (d=d@entry=0x555557ab6500) at /root/qemu/hw/pci/shpc.c:676
#11 0x0000555555a12560 in pcie_pci_bridge_realize (d=0x555557ab6500, errp=0x7fffffffd530) at /root/qemu/hw/pci-bridge/pcie_pci_bridge.c:84
#12 0x0000555555a18d07 in pci_qdev_realize (qdev=0x555557ab6500, errp=0x7fffffffd5d0) at /root/qemu/hw/pci/pci.c:2024
#13 0x00005555559b53aa in device_set_realized (obj=<optimized out>, value=<optimized out>, errp=0x7fffffffd708) at /root/qemu/hw/core/qdev.c:914
#14 0x0000555555ae62fe in property_set_bool (obj=0x555557ab6500, v=<optimized out>, name=<optimized out>, opaque=0x555557ab7b30, errp=0x7fffffffd708) at /root/qemu/qom/object.c:1886
#15 0x0000555555aea3ef in object_property_set_qobject (obj=obj@entry=0x555557ab6500, value=value@entry=0x555557ab86b0, name=name@entry=0x555555c4f217 "realized", errp=errp@entry=0x7fffffffd708) at /root/qemu/qom/qom-qobject.c:27
#16 0x0000555555ae80a0 in object_property_set_bool (obj=0x555557ab6500, value=<optimized out>, name=0x555555c4f217 "realized", errp=0x7fffffffd708) at /root/qemu/qom/object.c:1162
#17 0x0000555555949824 in qdev_device_add (opts=0x5555567795b0, errp=errp@entry=0x7fffffffd7e0) at /root/qemu/qdev-monitor.c:630
#18 0x000055555594be87 in device_init_func (opaque=<optimized out>, opts=<optimized out>, errp=<optimized out>) at /root/qemu/vl.c:2418
#19 0x0000555555bc85ba in qemu_opts_foreach (list=<optimized out>, func=func@entry=0x55555594be60 <device_init_func>, opaque=opaque@entry=0x0, errp=errp@entry=0x0) at /root/qemu/util/qemu-option.c:1104
#20 0x000055555579f497 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at /root/qemu/vl.c:4745
(gdb) fr 11
#11 0x0000555555a12560 in pcie_pci_bridge_realize (d=0x555557ab6500, errp=0x7fffffffd530) at /root/qemu/hw/pci-bridge/pcie_pci_bridge.c:84
84          shpc_free(d);
(gdb) l
79          pcie_aer_exit(d);
80      aer_error:
81      pm_error:
82          pcie_cap_exit(d);
83      cap_error:
84          shpc_free(d);
85      error:
86          pci_bridge_exitfn(d);
87      }
88
(gdb) 


-- 
Eduardo