RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1030174 - blockdev-snapshot-sync/snapshot_blkdev considers file //root/sn1 and file /root/sn1 as different files
Summary: blockdev-snapshot-sync/snapshot_blkdev considers file //root/sn1 and file /r...
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.0
Hardware: x86_64
OS: Linux
low
low
Target Milestone: rc
: ---
Assignee: Jeff Cody
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-11-14 04:46 UTC by Jun Li
Modified: 2013-11-26 19:47 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-11-26 19:47:58 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)

Description Jun Li 2013-11-14 04:46:08 UTC
Description of problem:
Host considers //root/sn1 and /root/sn1 as the same file. But blockdev-snapshot-sync/snapshot_blkdev considers //root/sn1 and /root/sn1 as different files. So blockdev-snapshot-sync/snapshot_blkdev will rewrite  file /root/sn1, then qemu-kvm can not do blockdev-snapshot-sync/snapshot_blkdev.

Version-Release number of selected component (if applicable):
qemu-kvm-rhev-1.5.3-19.el7.x86_64
3.10.0-48.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Boot qemu with following cli.
<cli>:
# /usr/libexec/qemu-kvm -S -M pc-i440fx-rhel7.0.0 -cpu SandyBridge -enable-kvm -m 4G -smp 4,sockets=2,cores=2,threads=1 -name juli -uuid 355a2475-4e03-4cdd-bf7b-5d6a59edaa68 -rtc base=localtime,clock=host,driftfix=slew \
-device virtio-scsi-pci,bus=pci.0,addr=0x5,id=scsi0 -drive file=iscsi://10.66.6.82:3260/iqn.2013-11.com.example:storage.disk1.juli.xyz/1,if=none,id=drive-scsi0-0-0,media=disk,cache=none,format=qcow2,werror=stop,rerror=stop,aio=native  -device scsi-hd,drive=drive-scsi0-0-0,bus=scsi0.0,scsi-id=0,lun=0,id=juli,bootindex=0 \
-drive file=iscsi://10.66.6.82:3260/iqn.2013-11.com.example:storage.disk1.juli.xyz/3,if=none,id=drive-virtio0-0-0,media=disk,werror=stop,rerror=stop,cache=none,format=qcow2 \
-device virtio-blk-pci,bus=pci.0,drive=drive-virtio0-0-0,id=virtio0-0-0 \
-drive file=/home/ISO/en_windows_8.1_preview_x86_dvd_2358833.iso,if=none,media=cdrom,format=raw,aio=native,id=drive-ide1-0-0 -device ide-drive,drive=drive-ide1-0-0,id=ide1-0-0,bus=ide.0,unit=0,bootindex=4 -device virtio-balloon-pci,id=ballooning -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 -net none -k en-us -boot menu=on,reboot-timeout=-1,strict=on -qmp tcp:0:4477,server,nowait -serial unix:/tmp/ttyS0,server,nowait -vnc :3 -spice port=5939,disable-ticketing  -vga qxl -global qxl-vga.revision=3 -monitor stdio -monitor tcp:0:7777,server,nowait -monitor unix:/tmp/monitor1,server,nowait \
-netdev tap,id=tap1,vhost=on,queues=4,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,ifname=tap-juli \
-device virtio-net-pci,netdev=tap1,id=nic1,mq=on,vectors=17,mac=1a:59:0a:4b:aa:94

2.create snapshot via qmp just like the followings:
{ "execute": "blockdev-snapshot-sync", "arguments": { "device": "drive-scsi0-0-0", "snapshot-file": "/root/sn1", "format": "qcow2" } }
{ "execute": "blockdev-snapshot-sync", "arguments": { "device": "drive-scsi0-0-0", "snapshot-file": "//root/sn1", "format": "qcow2" } }

3.create a new snapshot via qmp, check the return value.
{ "execute": "blockdev-snapshot-sync", "arguments": { "device": "drive-scsi0-0-0", "snapshot-file": "//root/sn2", "format": "qcow2" } }


Actual results:
{ "execute": "blockdev-snapshot-sync", "arguments": { "device": "drive-scsi0-0-0", "snapshot-file": "//root/sn2", "format": "qcow2" } }
{"error": {"class": "GenericError", "desc": "Could not open '//root/sn1': Could not set AIO state: Too many open files: Too many open files"}}

Expected results:
blockdev-snapshot-sync/snapshot_blkdev should consider //root/sn1 and /root/sn1 as the same files. Do not rewrite file /root/sn1.

Additional info:

Comment 2 Ademar Reis 2013-11-26 19:47:58 UTC
Corner case, libvirt will prevent it from happening and there's no consensus upstream. Closing it as WONTFIX.

BTW, qemu-kvm direct usage won't be supported in RHEL7.


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