Bug 807023 - libvirt does not check for successful device_del
libvirt does not check for successful device_del
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: libvirt (Show other bugs)
6.3
Unspecified Unspecified
unspecified Severity unspecified
: rc
: ---
Assigned To: Jiri Denemark
Virtualization Bugs
: Upstream
: 958786 1088508 (view as bug list)
Depends On: 813748 1090918 1093033
Blocks: 1056252 1044466
  Show dependency treegraph
 
Reported: 2012-03-26 15:19 EDT by Alex Williamson
Modified: 2016-04-26 11:15 EDT (History)
23 users (show)

See Also:
Fixed In Version: libvirt-0.10.2-38.el6
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 840450 984112 (view as bug list)
Environment:
Last Closed: 2014-10-14 00:13:51 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


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Description Alex Williamson 2012-03-26 15:19:28 EDT
Description of problem:
libvirt appears to always assume a device_del is successful.  This is not always the case.  Issuing a device_del simply registers a request to eject the device with the guest, it doesn't guarantee removal.  There are numerous reasons a guest may fail to release the device, however, when this happens libvirt does not report error and continues as if the removal was successful.

In my case I see this with a tg3 devices assigned to the guest.  The guest driver attempts to do a power state transition on the device, which doesn't work, and gets stuck.  The guest never calls the eject method for the device, but libvirt continues to unbind the device from pci-stub and pretend the removal was successful.

We need to come up with some strategy of libvirt polling the devices attached to the guest after the device_del, checking whether the removal was successful.

Version-Release number of selected component (if applicable):
libvirt-0.9.10-5.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Assign a tg3 device to a guest
2. Bring up the interface in the guest
3. Try to remove the device
  
Actual results:
libvirt reports success and unbinds the device from pci-stub, meanwhile the guest still owns the device (/proc/pid/fd still reports all the device file descriptors open).

Expected results:
libvirt checks for device removal and reports error after some timeout and doesn't unbind device from pci-stub.

Additional info:
Comment 2 Dave Allan 2012-03-28 11:23:45 EDT
This seems like a situation that's going to be difficult for libvirt to resolve without additional information from qemu.  Jiri, what do you think?
Comment 3 Jiri Denemark 2012-03-29 11:00:19 EDT
It won't be easy even with additional information from qemu. We would need to change detach API to be just a request for detaching and generate an event (emitted by qemu) when the device gets detached. However, this would mean the semantics of the api changed so it might be difficult to deal with, although one can argue that it didn't work with current semantics anyway.
Comment 5 weizhang 2012-04-10 08:58:18 EDT
Reproduce with steps
1. Start a guest with the following hostdev device
...

   <hostdev mode='subsystem' type='pci' managed='yes'>
            <source>
                <address bus='5' slot='0' function='0'/>
            </source>
    </hostdev>
...
2. Start a guest
3. At the same time with step2, detach device from the guest asap
# virsh detach-device guest pci.xml
# cat pci.xml
   <hostdev mode='subsystem' type='pci' managed='yes'>
            <source>
                <address bus='5' slot='0' function='0'/>
            </source>
    </hostdev>
4. ll /proc/[pid of guest]/fd

Result: In step3, libvirt report that detach-device succeed, but in step4, we still can see the device info
...
13 -> /system/devices/pci0000:00/0000:00:1c.4/0000:05:00.0/resource0
24 -> /system/devices/pci0000:00/0000:00:1c.4/0000:05:00.0/config
...
Comment 10 Ademar Reis 2012-10-15 11:58:51 EDT
also related: Bug 848955
Comment 11 Dan Kenigsberg 2012-12-09 07:50:21 EST
Until the guest acts upon device_del command, qemu keeps the device listed. If a managing process wants to poll for the success of the asynchronous command, it can.

# virsh -c qemu+tcp://localhost/system qemu-monitor-command vm1 --hmp info network
Devices not on any VLAN:
  net0: model=virtio-net-pci,macaddr=00:1a:4a:16:01:b0 peer=hostnet0
  hostnet1: fd=33 peer=net1
  net1: model=virtio-net-pci,macaddr=00:1a:4a:16:01:60 peer=hostnet1

However, libvirt hides the fact that updateDevice command hasn't reached completion, and drops the still-residing device from the domxml. That's bad, as it denies crucial information from vdsm.

# virsh -c qemu+tcp://localhost/system dumpxml vm1
...
<devices>
...
    <interface type='bridge'>
      <mac address='00:1a:4a:16:01:60'/>
      <source bridge='ovirtmgmt'/>
      <target dev='vnet0'/>
      <model type='virtio'/>
      <link state='up'/>
      <alias name='net1'/>
    </interface>
...
</devices>

Libvirt should let its client check whether the async command has finished. A nice bonus would be an event emitted when the device is released in qemu.
Comment 13 Peter Krempa 2013-05-30 12:16:31 EDT
*** Bug 958786 has been marked as a duplicate of this bug. ***
Comment 16 Jiri Denemark 2013-07-22 07:17:53 EDT
This is not implemented usptream (v1.1.0-278-g0dfb8a1).
Comment 17 Jiri Denemark 2013-07-25 04:29:34 EDT
s/not/now/ :-P
Comment 18 David Hill 2013-10-11 20:44:16 EDT
I seem to be experiencing the same issue with our openstack implementation.

If we don't put the disk as "offline" before detaching it, after some attach/detach iterations, it will simply refuse to attach the volume until the qemu process is restarted.

I've successfully recreated this issue many times with Windows 7.
Comment 22 Jiri Denemark 2014-04-17 04:53:27 EDT
*** Bug 1088508 has been marked as a duplicate of this bug. ***
Comment 23 Dafna Ron 2014-04-17 09:41:51 EDT
*** Bug 1088508 has been marked as a duplicate of this bug. ***
Comment 26 Hu Jianwei 2014-06-12 05:15:02 EDT
I still can reproduce it using below packages version, after step 3, the hostdev can not be found in domain xml, but it is still in guest OS.

Version:
libvirt-0.10.2-38.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.427.el6.x86_64
[root@sriov2 ~]# 

1. Define a guest with the following hostdev device
[root@sriov2 ~]# cat hostdev.xml 
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address bus='0x01' slot='0' function='0'/>
</source>
</hostdev>

[root@sriov2 ~]# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     rhel6                          shut off
 -     rhel63                         shut off

[root@sriov2 ~]# virsh dumpxml rhel6 | grep -A10 hostdev
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </hostdev>

2. Start the guest, at the same time detach that device in another terminal.
[root@sriov2 ~]# virsh start rhel6
Domain rhel6 started

In another terminal,execute below command immediately:
[root@sriov2 ~]# virsh detach-device rhel6 hostdev.xml
Device detached successfully

3. Dumpxml domain xml and check process fd.
[root@sriov2 ~]# virsh dumpxml rhel6 | grep -A10 hostdev                                               
[root@sriov2 ~]#                                          <===== incorrect! 
[root@sriov2 ~]# virsh dumpxml rhel6 --inactive| grep -A10 hostdev
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </hostdev>

[root@sriov2 ~]# ll /proc/`pidof qemu-kvm`/fd | grep "/sys/devices/"
lrwx------. 1 qemu qemu 64 Jun 12 17:02 20 -> /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/resource0
lrwx------. 1 qemu qemu 64 Jun 12 17:02 21 -> /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/resource2
lrwx------. 1 qemu qemu 64 Jun 12 17:02 22 -> /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/resource3
lrwx------. 1 qemu qemu 64 Jun 12 17:02 25 -> /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/config

[In guest OS]
[root@localhost ~]# lspci | grep Et
00:08.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
Comment 27 Jiri Denemark 2014-06-12 05:32:15 EDT
That's correct, the new behavior can only be observed with qemu-kvm which supports DEVICE_DEL event. So the good thing is, you verified that with an older qemu-kvm, libvirt works in the way it used to work.

To actually test the new behavior, you need to wait for a new qemu-kvm package, specifically for the one which will contain patches for bug 813748 (the patches are ACKed so it should not take a long time for them to be built into a new package).
Comment 28 Hu Jianwei 2014-06-12 20:50:21 EDT
(In reply to Jiri Denemark from comment #27)
> That's correct, the new behavior can only be observed with qemu-kvm which
> supports DEVICE_DEL event. So the good thing is, you verified that with an
> older qemu-kvm, libvirt works in the way it used to work.
> 
> To actually test the new behavior, you need to wait for a new qemu-kvm
> package, specifically for the one which will contain patches for bug 813748
> (the patches are ACKed so it should not take a long time for them to be
> built into a new package).

Great! Thanks for your information.
Comment 29 Hu Jianwei 2014-06-18 01:45:28 EDT
I can not reproduce it on below packages.

Version:
libvirt-0.10.2-38.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.428.el6.x86_64

Scenario 1:
[root@sriov2 ~]# cat hostdev.xml
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address bus='0x01' slot='0' function='0'/>
</source>
</hostdev>
[root@sriov2 ~]# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     rhel6                          shut off
 -     rhel63                         shut off
 -     rhel65                         shut off

[root@sriov2 ~]# virsh dumpxml rhel6 --inactive| grep -A10 hostdev
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </hostdev>

[root@sriov2 ~]# virsh start rhel6
Domain rhel6 started

In another terminal,execute below command immediately:
[root@sriov2 ~]# virsh detach-device rhel6 hostdev.xml
Device detached successfully


[root@sriov2 ~]# virsh dumpxml rhel6 | grep -A10 hostdev
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
      </source>
      <alias name='hostdev0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </hostdev>

[root@sriov2 ~]# ll /proc/`pidof qemu-kvm`/fd | grep "/sys/devices/"
lrwx------. 1 qemu qemu 64 Jun 18 11:47 20 -> /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/resource0
lrwx------. 1 qemu qemu 64 Jun 18 11:47 21 -> /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/resource2
lrwx------. 1 qemu qemu 64 Jun 18 11:47 22 -> /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/resource3
lrwx------. 1 qemu qemu 64 Jun 18 11:47 25 -> /sys/devices/pci0000:00/0000:00:1c.0/0000:01:00.0/config
[root@sriov2 ~]# virsh console rhel6
[root@localhost ~]# lspci | grep Et
00:08.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
[root@localhost ~]# 

Scenario 2:
1. Start domian with hostdev device.
[root@sriov2 ~]# virsh start rhel6
Domain rhel6 started

[root@sriov2 ~]# virsh dumpxml rhel6| grep hostdev -aA 8
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
      </source>
      <alias name='hostdev0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </hostdev>

2. Leave OS in grub menu, and detach that hostdev device.(it won't actually detach the device since guest OS is not responding; check domain XML it's still there)
[root@sriov2 ~]# vncviewer 127.0.0.1
[root@sriov2 ~]# cat hostdev.xml
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address bus='0x01' slot='0' function='0'/>
</source>
</hostdev>
[root@sriov2 ~]# virsh detach-device rhel6 hostdev.xml
Device detached successfully

[root@sriov2 ~]# virsh dumpxml rhel6| grep hostdev -aA 8
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
      </source>
      <alias name='hostdev0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </hostdev>

3. Stop libvirtd service.
[root@sriov2 ~]# service libvirtd stop
Stopping libvirtd daemon:                                  [  OK  ]
[root@sriov2 ~]# service libvirtd status
libvirtd is stopped

4.Continue to boot domain, and check the interface in domain, it's in domain.

5. Connect to qemu monitor manually and remove the PCI device
[root@sriov2 ~]# socat stdin unix-connect:/var/lib/libvirt/qemu/rhel6.monitor
{"QMP": {"version": {"qemu": {"micro": 1, "minor": 12, "major": 0}, "package": "(qemu-kvm-0.12.1.2)"}, "capabilities": []}}
{"execute":"qmp_capabilities","id":"libvirt-1"}
{"return": {}, "id": "libvirt-1"}
{"execute":"device_del","arguments":{"id":"hostdev0"}}
{"return": {}}
{"timestamp": {"seconds": 1403063829, "microseconds": 94636}, "event": "DEVICE_DELETED", "data": {"device": "hostdev0"}}

6. Start libvirtd service.
[root@sriov2 ~]# service libvirtd start
Starting libvirtd daemon:                                  [  OK  ]

7. Check domain XML, libvirtd updated the domain xml automatically after reconnecting to running domain.
[root@sriov2 ~]# virsh list --all
 Id    Name                           State
----------------------------------------------------
 28    rhel6                          running
 -     rhel63                         shut off
 -     rhel65                         shut off

[root@sriov2 ~]# virsh dumpxml rhel6| grep hostdev -aA 8  <====no hostdev device
[root@sriov2 ~]# virsh dumpxml rhel6 --inactive| grep hostdev -aA 8
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </hostdev>

Also tested it using Intel 82576 NIC(on pf/vf), testing results are same as common NIC.

We can get expected results in two scenarios, so changed to verified.
Comment 30 Hu Jianwei 2014-08-19 00:00:16 EDT
Added testing results for backend driver of interface on host OS.

Version:
libvirt-0.10.2-43.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.428.el6.x86_64

For scenario 1 in comment 29
[root@rhel6 ~]# virsh start r7
Domain r7 started

In another terminal,execute below command immediately:
[root@rhel6 ~]# virsh detach-device r7 hostdev.xml
Device detached successfully

(Note that: Here is a rhel7 bug on Bug 993631 - Libvirt should report failure when detach hostdev unsuccessfully, but no bug on rhel6 at present.)

[root@rhel6 ~]# virsh dumpxml r7 | grep -A10 hostdev
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
      </source>
      <alias name='hostdev0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/>
    </hostdev>
...

[root@rhel6 ~]# ll /proc/`pidof qemu-kvm`/fd | grep "/sys/devices/"
lrwx------. 1 qemu qemu 64 Aug 19 11:39 23 -> /sys/devices/pci0000:00/0000:00:1e.0/0000:02:00.0/resource0
lrwx------. 1 qemu qemu 64 Aug 19 11:39 24 -> /sys/devices/pci0000:00/0000:00:1e.0/0000:02:00.0/config
lrwx------. 1 qemu qemu 64 Aug 19 11:39 25 -> /sys/devices/pci0000:00/0000:00:1e.0/0000:02:00.0/resource1
lrwx------. 1 qemu qemu 64 Aug 19 11:39 26 -> /sys/devices/pci0000:00/0000:00:1e.0/0000:02:00.0/resource2
[root@rhel6 ~]# lspci -s 02:00.0 -vv
02:00.0 Ethernet controller: Intel Corporation 82541PI Gigabit Ethernet Controller (rev 05)
	Subsystem: Intel Corporation PRO/1000 GT Desktop Adapter
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 32 (63750ns min), Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 20
	Region 0: Memory at f7c40000 (32-bit, non-prefetchable) [size=128K]
	Region 1: Memory at f7c20000 (32-bit, non-prefetchable) [size=128K]
	Region 2: I/O ports at d000 [size=64]
	Expansion ROM at cf300000 [disabled] [size=128K]
	Capabilities: [dc] Power Management version 2
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-
	Capabilities: [e4] PCI-X non-bridge device
		Command: DPERE- ERO+ RBC=512 OST=1
		Status: Dev=00:00.0 64bit- 133MHz- SCD- USC- DC=simple DMMRBC=2048 DMOST=1 DMCRS=8 RSCEM- 266MHz- 533MHz-
	Kernel driver in use: pci-stub
	Kernel modules: e1000

[root@rhel6 ~]# virsh destroy r7
Domain r7 destroyed

[root@rhel6 ~]# lspci -s 02:00.0 -vv
02:00.0 Ethernet controller: Intel Corporation 82541PI Gigabit Ethernet Controller (rev 05)
	Subsystem: Intel Corporation PRO/1000 GT Desktop Adapter
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 32 (63750ns min), Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 20
	Region 0: Memory at f7c40000 (32-bit, non-prefetchable) [size=128K]
	Region 1: Memory at f7c20000 (32-bit, non-prefetchable) [size=128K]
	Region 2: I/O ports at d000 [size=64]
	Expansion ROM at cf300000 [disabled] [size=128K]
	Capabilities: [dc] Power Management version 2
		Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME-
	Capabilities: [e4] PCI-X non-bridge device
		Command: DPERE- ERO+ RBC=512 OST=1
		Status: Dev=00:00.0 64bit- 133MHz- SCD- USC- DC=simple DMMRBC=2048 DMOST=1 DMCRS=8 RSCEM- 266MHz- 533MHz-
	Kernel driver in use: e1000
	Kernel modules: e1000

For scenario 2 in comment 29
[root@rhel6 ~]# virsh start r7
Domain r7 started

Leave OS in grub menu, and detach that hostdev device.(it won't actually detach the device since guest OS is not responding; check domain XML it's still there)

[root@rhel6 ~]# virsh detach-device r7 hostdev.xml
Device detached successfully

[root@rhel6 ~]# virsh dumpxml r7| grep hostdev -aA 8
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
      </source>
      <alias name='hostdev0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/>
    </hostdev>
...

[root@rhel6 ~]# lspci -s 02:00.0 -vv| grep Kernel
	Kernel driver in use: pci-stub
	Kernel modules: e1000
[root@rhel6 ~]# service libvirtd stop
Stopping libvirtd daemon:                                  [  OK  ]

[root@rhel6 ~]# lspci -s 02:00.0 -vv| grep Kernel
	Kernel driver in use: pci-stub
	Kernel modules: e1000
[root@rhel6 ~]# socat stdin unix-connect:/var/lib/libvirt/qemu/r7.monitor
{"QMP": {"version": {"qemu": {"micro": 1, "minor": 12, "major": 0}, "package": "(qemu-kvm-0.12.1.2)"}, "capabilities": []}}
{"execute":"qmp_capabilities","id":"libvirt-1"}
{"return": {}, "id": "libvirt-1"}
{"execute":"device_del","arguments":{"id":"hostdev0"}}
{"return": {}}
{"timestamp": {"seconds": 1408420401, "microseconds": 322202}, "event": "DEVICE_DELETED", "data": {"device": "hostdev0"}}
^C

[root@rhel6 ~]lspci -s 02:00.0 -vv| grep Kernel
	Kernel driver in use: pci-stub
	Kernel modules: e1000

[root@rhel6 ~]# service libvirtd start
Starting libvirtd daemon:                                  [  OK  ]

[root@rhel6 ~]# virsh dumpxml r7| grep hostdev -aA 8
[root@rhel6 ~]# lspci -s 02:00.0 -vv| grep Kernel
	Kernel driver in use: e1000
	Kernel modules: e1000
Comment 31 Hu Jianwei 2014-08-19 00:03:28 EDT
Hi Alex,

Could you agree my testing results in comment 29 and 30? 

Thanks.
Comment 32 Alex Williamson 2014-08-19 13:56:50 EDT
(In reply to Hu Jianwei from comment #31)
> Hi Alex,
> 
> Could you agree my testing results in comment 29 and 30? 

It looks correct to me.  Bug 993631 should probably be cloned to rhel6, but can be resolved separately.
Comment 33 Hu Jianwei 2014-08-25 03:30:54 EDT
> It looks correct to me.  Bug 993631 should probably be cloned to rhel6, but
> can be resolved separately.

Thanks, the bug has been cloned to rhel6.
Bug 1133443 - Libvirt should report failure when detach hostdev unsuccessfully.
Comment 35 errata-xmlrpc 2014-10-14 00:13:51 EDT
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1374.html

Note You need to log in before you can comment on or make changes to this bug.