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Bug 1808399 - [RHEL-8.2 libvirt] can't start two guests with passthrough of an iscsi lun with "shareable" element
Summary: [RHEL-8.2 libvirt] can't start two guests with passthrough of an iscsi lun wi...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: libvirt
Version: 8.2
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: rc
: 8.2
Assignee: Andrea Bolognani
QA Contact: gaojianan
URL:
Whiteboard:
Depends On: 1808388
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-02-28 12:06 UTC by Andrea Bolognani
Modified: 2021-09-03 15:11 UTC (History)
8 users (show)

Fixed In Version: libvirt-4.5.0-42.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-04-28 15:33:47 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-38494 0 None None None 2021-09-03 15:11:06 UTC
Red Hat Product Errata RHEA-2020:1587 0 None None None 2020-04-28 15:34:00 UTC

Description Andrea Bolognani 2020-02-28 12:06:40 UTC 
This bug was initially created as a copy of Bug #1801139

I am copying this bug because: 

  The bug has been addressed in RHEL 7.8 with downstream-only patch

    libvirt-RHEL-qemuCheckUnprivSGIO-use-sysfs_path-to-get-unpriv_sgio.patch

  but this patch is absent from RHEL 8.2, which means someone
  moving from the former to the latter will see a regression.

Description of problem:
As subject

Version-Release number of selected component (if applicable):
libvirt-4.5.0-32.virtcov.el7.x86_64
qemu-kvm-rhev-2.12.0-44.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Prepare an iscsi server and login the target in the host
# iscsiadm -m session
tcp: [1] 10.66.85.243:3260,1 iqn.2015-01.com.fred:444 (non-flash)
tcp: [2] 10.66.85.243:3260,1 iqn.2016-03.com.virttest:logical-pool.target6 (non-flash)

# lsscsi
...
[5:0:0:0]    disk    LIO-ORG  device.logical-  4.0   /dev/sdc 

2.Passthrough the disk to two guests
For the 1st :
# cat attach.xml 
<hostdev managed="no" mode="subsystem" type="scsi">
<source>
<adapter name="scsi_host5" />
<address bus="0" target="0" unit="0" />
</source>
<shareable/>             --------------with shareable
</hostdev>

# virsh attach-device vm2 attach.xml                                                                                                                                                                         
Device attached successfully

For the 2nd with the same xml:
# virsh attach-device avocado-vt-vm1 attach.xml
error: Failed to attach device from attach.xml
error: Failed to read file '/dev/sdc': Value too large for defined data type

3.In the 2nd guest,you can also hit the issue by:
# virsh attach-device avocado-vt-vm1 attach.xml --config
Device attached successfully

# virsh start avocado-vt-vm1
error: Failed to start domain avocado-vt-vm1
error: Failed to read file '/dev/sdc': Value too large for defined data type

Actual results:
As step 2 and 3

Expected results:
The 2nd guest should be started without error

Additional info:
Comment 11 gaojianan 2020-03-17 11:36:05 UTC 
Sc1:hot-plug the device to two guests
1.Prepare an iscsi server and login the target in the host
# iscsiadm -m session
tcp: [85] 10.66.36.15:3260,1 iqn.2020-03.com.virttest:emulated-iscsi.target (non-flash)

# lsscsi
[0:0:0:0]    disk    ATA      MM0500GBKAK      HPGE  /dev/sda 
[4:0:0:0]    cd/dvd  hp       DVD RAM UJ8C2    SC02  /dev/sr0 
[6:0:0:0]    disk    LIO-ORG  device.emulated  4.0   /dev/sdb 


2.Passthrough the disk to two guests
For the 1st :
# cat attach.xml 
<hostdev managed="no" mode="subsystem" type="scsi">
<source>
<adapter name="scsi_host6" />
<address bus="0" target="0" unit="0" />
</source>
<shareable/>             --------------with shareable
</hostdev>

# virsh attach-device vm2 attach.xml                                                                                                                                                                         
Device attached successfully

For the 2nd with the same xml:
# virsh attach-device avocado-vt-vm1 attach.xml
Device attached successfully

Login the guest ,the disk works well

Sc2:cold-plug the device to two guests:
# virsh attach-device avocado-vt-vm1 attach.xml --config 
Device attached successfully

# virsh attach-device vm2 attach.xml --config 
Device attached successfully

# virsh start vm2
Domain vm2 started

# virsh start avocado-vt-vm1 
Domain avocado-vt-vm1 started

and then detach the device and attach again,
# virsh detach-device vm2 attach.xml 
Device detached successfully

# virsh attach-device vm2 attach.xml 
Device attached successfully

Work as expected
Comment 13 errata-xmlrpc 2020-04-28 15:33:47 UTC 
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.

https://access.redhat.com/errata/RHEA-2020:1587
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