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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 1RHEL 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.
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
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