* [Qemu-devel] device_add error handling regressed in v1.5.0
@ 2014-01-17 10:23 Markus Armbruster
2014-01-17 12:41 ` Paolo Bonzini
0 siblings, 1 reply; 4+ messages in thread
From: Markus Armbruster @ 2014-01-17 10:23 UTC (permalink / raw)
To: qemu-devel; +Cc: Paolo Bonzini, Andreas Färber
Watch this:
$ upstream-qemu -nodefaults -S -display none -monitor stdio
QEMU 1.7.50 monitor - type 'help' for more information
(qemu) device_add e1000,netdev=xxx
Property 'e1000.netdev' can't find value 'xxx'
(qemu) info qtree
bus: main-system-bus
type System
dev: hpet, id ""
gpio-in 2
gpio-out 1
timers = 3
msi = off
hpet-intcap = 4
irq 32
mmio 00000000fed00000/0000000000000400
dev: ioapic, id ""
gpio-in 24
irq 0
mmio 00000000fec00000/0000000000001000
dev: i440FX-pcihost, id ""
pci-hole64-size = 16777216.000T
short_root_bus = 0
irq 0
bus: pci.0
type PCI
dev: e1000, id ""
mac = 00:00:00:00:00:00
vlan = <null>
netdev = <null>
bootindex = -1
autonegotiation = on
mitigation = on
addr = <unset>
romfile = <null>
rombar = 1
multifunction = off
command_serr_enable = on
Segmentation fault (core dumped)
Even though device_add failed, it still created a node in the qtree!
Same issue observed with scsi-hd. Looks like a qdev problem, not a
device problem.
git-bisect blames this one:
e0a83fc2c1582dc8d4453849852ebe6c258b7c3a is the first bad commit
commit e0a83fc2c1582dc8d4453849852ebe6c258b7c3a
Author: Paolo Bonzini <pbonzini@redhat.com>
Date: Tue Apr 2 15:50:00 2013 +0200
qom: do nothing on unparent of object without parent
Otherwise, device_unparent will fail to get a canonical path of
the object.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1364910600-3418-1-git-send-email-pbonzini@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] device_add error handling regressed in v1.5.0
2014-01-17 10:23 [Qemu-devel] device_add error handling regressed in v1.5.0 Markus Armbruster
@ 2014-01-17 12:41 ` Paolo Bonzini
2014-01-20 12:41 ` Markus Armbruster
0 siblings, 1 reply; 4+ messages in thread
From: Paolo Bonzini @ 2014-01-17 12:41 UTC (permalink / raw)
To: Markus Armbruster; +Cc: qemu-devel, Andreas Färber
Il 17/01/2014 11:23, Markus Armbruster ha scritto:
> e0a83fc2c1582dc8d4453849852ebe6c258b7c3a is the first bad commit
> commit e0a83fc2c1582dc8d4453849852ebe6c258b7c3a
> Author: Paolo Bonzini <pbonzini@redhat.com>
> Date: Tue Apr 2 15:50:00 2013 +0200
>
> qom: do nothing on unparent of object without parent
>
> Otherwise, device_unparent will fail to get a canonical path of
> the object.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> Message-id: 1364910600-3418-1-git-send-email-pbonzini@redhat.com
> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
>
I think Amos had a fix for this.
Paolo
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] device_add error handling regressed in v1.5.0
2014-01-17 12:41 ` Paolo Bonzini
@ 2014-01-20 12:41 ` Markus Armbruster
2014-01-20 13:10 ` Markus Armbruster
0 siblings, 1 reply; 4+ messages in thread
From: Markus Armbruster @ 2014-01-20 12:41 UTC (permalink / raw)
To: Amos Kong; +Cc: Paolo Bonzini, qemu-devel, Andreas Färber
Paolo Bonzini <pbonzini@redhat.com> writes:
> Il 17/01/2014 11:23, Markus Armbruster ha scritto:
>> Watch this:
>>
>> $ upstream-qemu -nodefaults -S -display none -monitor stdio
>> QEMU 1.7.50 monitor - type 'help' for more information
>> (qemu) device_add e1000,netdev=xxx
>> Property 'e1000.netdev' can't find value 'xxx'
>> (qemu) info qtree
[...]
>> Segmentation fault (core dumped)
>>
>> Even though device_add failed, it still created a node in the qtree!
>>
>> Same issue observed with scsi-hd. Looks like a qdev problem, not a
>> device problem.
>>
>> git-bisect blames this one:
>>
>> e0a83fc2c1582dc8d4453849852ebe6c258b7c3a is the first bad commit
>> commit e0a83fc2c1582dc8d4453849852ebe6c258b7c3a
>> Author: Paolo Bonzini <pbonzini@redhat.com>
>> Date: Tue Apr 2 15:50:00 2013 +0200
>>
>> qom: do nothing on unparent of object without parent
>>
>> Otherwise, device_unparent will fail to get a canonical path of
>> the object.
>>
>> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
>> Message-id: 1364910600-3418-1-git-send-email-pbonzini@redhat.com
>> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
>>
>
> I think Amos had a fix for this.
Amos, do you?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [Qemu-devel] device_add error handling regressed in v1.5.0
2014-01-20 12:41 ` Markus Armbruster
@ 2014-01-20 13:10 ` Markus Armbruster
0 siblings, 0 replies; 4+ messages in thread
From: Markus Armbruster @ 2014-01-20 13:10 UTC (permalink / raw)
To: Amos Kong; +Cc: Paolo Bonzini, qemu-devel, Andreas Färber
Markus Armbruster <armbru@redhat.com> writes:
> Paolo Bonzini <pbonzini@redhat.com> writes:
>
>> Il 17/01/2014 11:23, Markus Armbruster ha scritto:
>>> Watch this:
>>>
>>> $ upstream-qemu -nodefaults -S -display none -monitor stdio
>>> QEMU 1.7.50 monitor - type 'help' for more information
>>> (qemu) device_add e1000,netdev=xxx
>>> Property 'e1000.netdev' can't find value 'xxx'
>>> (qemu) info qtree
> [...]
>>> Segmentation fault (core dumped)
>>>
>>> Even though device_add failed, it still created a node in the qtree!
>>>
>>> Same issue observed with scsi-hd. Looks like a qdev problem, not a
>>> device problem.
>>>
>>> git-bisect blames this one:
>>>
>>> e0a83fc2c1582dc8d4453849852ebe6c258b7c3a is the first bad commit
>>> commit e0a83fc2c1582dc8d4453849852ebe6c258b7c3a
>>> Author: Paolo Bonzini <pbonzini@redhat.com>
>>> Date: Tue Apr 2 15:50:00 2013 +0200
>>>
>>> qom: do nothing on unparent of object without parent
>>>
>>> Otherwise, device_unparent will fail to get a canonical path of
>>> the object.
>>>
>>> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
>>> Message-id: 1364910600-3418-1-git-send-email-pbonzini@redhat.com
>>> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
>>>
>>
>> I think Amos had a fix for this.
>
> Amos, do you?
Found it: "[PATCH v2] qdev: add the device to the QOM tree before using
it to set a link" seems to fix it.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-01-20 13:10 UTC | newest]
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2014-01-17 10:23 [Qemu-devel] device_add error handling regressed in v1.5.0 Markus Armbruster
2014-01-17 12:41 ` Paolo Bonzini
2014-01-20 12:41 ` Markus Armbruster
2014-01-20 13:10 ` Markus Armbruster
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