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 844582 - virtio-rng: module removal doesn't succeed till input from host received
Summary: virtio-rng: module removal doesn't succeed till input from host received
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.4
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Amit Shah
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-07-31 06:21 UTC by Amit Shah
Modified: 2013-07-01 02:38 UTC (History)
8 users (show)

Fixed In Version: kernel-2.6.32-298.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-02-21 06:44:15 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 849196 1 None None None 2021-01-20 06:05:38 UTC
Red Hat Product Errata RHSA-2013:0496 0 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 6 kernel update 2013-02-20 21:40:54 UTC

Internal Links: 849196

Description Amit Shah 2012-07-31 06:21:59 UTC 
Description of problem:

If input from host is expected (e.g. by executing cat /dev/hwrng), and module removal is attempted, the rmmod process doesn't finish.

The fix is to not wait for host input when module remove request is received.
Upstream commit is 4476987a9a4525db3ebe29538cc357ca589db4ac.

For testing this, the virtio-rng device isn't yet available upstream or in a RHEL release.  I can give a qemu-kvm build to QE for testing and verification purposes, let me know when you need it.
Comment 1 RHEL Program Management 2012-08-06 10:11:30 UTC 
This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release.  Product
Management has requested further review of this request by
Red Hat Engineering, for potential inclusion in a Red Hat
Enterprise Linux release for currently deployed products.
This request is not yet committed for inclusion in a release.
Comment 2 juzhang 2012-08-09 02:51:38 UTC 
marked ack+, qe tried virtio rng build.
Comment 4 Jarod Wilson 2012-08-16 15:01:10 UTC 
Patch(es) available on kernel-2.6.32-298.el6
Comment 7 Qunfang Zhang 2012-12-28 08:10:17 UTC 
Hi, Amit
Tested on both kernel-2.6.32-279.el6 and kernel-2.6.32-348.el6 and the issues seems still exist. 

Steps:

1. Build a upstream qemu-kvm that has virtio-rng-pci device.

2. Boot a rhel6.3/rhel6.4 guest with "-device virtio-rng-pci,bus=pci.0,addr=0xa,id=rng0".

3. # lsmod | grep virtio
virtio_rng              2752  0 
......
virtio_ring             8301  5 virtio_rng,virtio_balloon,virtio_console,virtio_net,virtio_pci
virtio                  4977  5 virtio_rng,virtio_balloon,virtio_console,virtio_net,virtio_pci

4. #cat /dev/hwrng 

5. #rmmod virtio_rng

Result: After step 5, the 'rmmod' can not finished. Test both kernel-2.6.32-279.el6 and kernel-2.6.32-348.el6.

Hi, Amit
Could you help have a look?  Is there something wrong with my steps or the patch is not getting in so something else? 


Thanks,
Qunfang
Comment 8 Qunfang Zhang 2013-01-07 07:50:23 UTC 
Hi, Amit
I re-assign this bug as still have problem. Please take a look at it and correct me if there's some wrong.

Thanks,
Qunfang
Comment 12 errata-xmlrpc 2013-02-21 06:44:15 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.

http://rhn.redhat.com/errata/RHSA-2013-0496.html
Note You need to log in before you can comment on or make changes to this bug.