Red Hat Bugzilla – Bug 1333159
qemu-kvm doesn't reload udev rules before triggering for kvm device
Last modified: 2016-11-03 16:13:06 EDT
Description of problem: qemu-kvm(-rhev) package does not call "udevadm control --reload-rules" before triggering for kvm device a rule setting /dev/kvm ownership and permsions is missed while installing qemu-kvm-rhev package Version-Release number of selected component (if applicable): qemu-kvm 1.5.3 qemu-kvm-rhev 2.3.0 How reproducible: every time Steps to Reproduce: yum remove qemu-kvm-rhev rmmod kvm_intel kvm ixgbe ; modprobe kvm_intel ; modprobe ixgbe ls -l /dev/kvm crw-------. 1 root root 10, 232 26.4. 13:10 /dev/kvm ./sriov.sh ; yum install -y qemu-kvm-rhev Creating maximum number of SR-IOV VF insterfaces for the PCI device 0000:87:00.1 Creating maximum number of SR-IOV VF insterfaces for the PCI device 0000:87:00.0 ls -l /dev/kvm crw-------. 1 root root 10, 232 26.4. 13:11 /dev/kvm yum remove qemu-kvm-rhev yum install -y qemu-kvm-rhev ls -l /dev/kvm crw-rw-rw-. 1 root kvm 10, 232 26.4. 13:12 /dev/kvm Actual results: before triggering for kvm device qemu-kvm(-rhev) doesn't call: udevadm control --reload-rules Expected results: calls Additional info: More detailed tests, information in attached case
Hello, Simpler way to reproduce: #prepare rmmod kvm kvm_intel yum remove qemu-kvm modprobe kvm_intel # owner of /dev/kvm should be root. root # Test udevadm trigger yum install -y qemu-kvm # notably install must complete with 3s from trigger fpr bug to occur # check /dev/kvm owner it should be root.kvm if not you hit the bug If trigger is omitted above the permissions will change as they should olimpb
Fix included in qemu-kvm-1.5.3-114.el7
I got the same result between fixed and unfixed qemu-kvm. so I am not sure if this bug is fixed. Could you help me take a look at these steps? If it is wrong. please correct it. steps: 1.#rmmod kvm kvm_intel ２.#rpm -e qemu-kvm-tools-1.5.3-105.el7.x86_64 qemu-kvm-common-1.5.3-105.el7.x86_64 qemu-kvm-debuginfo-1.5.3-105.el7.x86_64 qemu-img-1.5.3-105.el7.x86_64 qemu-kvm-1.5.3-105.el7.x86_64 3.# modprobe kvm_intel 4.# ll /dev/kvm crw------- 1 root root 10, 232 Sep 5 15:20 /dev/kvm 5.#rpm -ivh qemu*(qemu-kvm-1.5.3-105......) 6.# ll /dev/kvm crw-rw-rw- 1 root kvm 10, 232 Sep 5 15:20 /dev/kvm The fixed version(qemu-kvm-1.5.3-121) and unfixed version(qemu-kvm-1.5.3-105.el7) got the same result as above.
cancel the needinfo in comment 9 as can reproduce it now. -------------------------reproduce--------------------- Test version: qemu-kvm-1.5.3-113.el7.x86_64 Test steps: 1. unload kvm module, uninstall qemu-kvm # rmmod kvm-intel kvm # rpm -qa | grep qemu-kvm qemu-kvm-common-1.5.3-113.el7.x86_64 qemu-kvm-1.5.3-113.el7.x86_64 # yum remove -y qemu-kvm-common-1.5.3-113.el7.x86_64 qemu-kvm-1.5.3-113.el7.x86_64 2. load kvm module # modprobe kvm_intel # lsmod | grep kvm kvm_intel 170125 0 kvm 543643 1 kvm_intel irqbypass 13503 2 kvm,vfio_pci 3. check owner of /dev/kvm, it is "root.root", right result. # ll /dev/kvm crw-------. 1 root root 10, 232 Sep 14 04:26 /dev/kvm 4. Install qemu-kvm while doing "udevadm trigger" # udevadm trigger; yum install -y ./qemu-* # rpm -qa | grep qemu-kvm qemu-kvm-common-1.5.3-113.el7.x86_64 qemu-kvm-1.5.3-113.el7.x86_64 5. check owner of /dev/kvm, it is "root.root", so hit this issue. # ll /dev/kvm crw-------. 1 root root 10, 232 Sep 14 04:28 /dev/kvm 6. uninstall qemu-kvm, then install qemu-kvm without "udevadm trigger" # yum remove -y qemu-kvm-common-1.5.3-113.el7.x86_64 qemu-kvm-1.5.3-113.el7.x86_64 # yum install -y ./qemu-* 7. check owner of /dev/kvm, it is "root.kvm" # ll /dev/kvm crw-rw-rw-. 1 root kvm 10, 232 Sep 14 04:30 /dev/kvm reproduce this bug successfully according the result of step 5. -------------------------verification--------------------- Test version: qemu-kvm-1.5.3-124.el7.x86_64 Test steps: same steps with above. 1. unload kvm module, uninstall qemu-kvm 2. load kvm module 3. check owner of /dev/kvm, it is "root.root", right result. 4. install qemu-kvm while doing "udevadm trigger". # udevadm trigger; yum install -y ./* (qemu-kvm-1.5.3-124.el7.x86_64) 5. check owner of /dev/kvm, it is "root.kvm". # ll /dev/kvm crw-rw-rw-. 1 root kvm 10, 232 Sep 14 04:32 /dev/kvm Move to VERIFIED according to the test result above.
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://rhn.redhat.com/errata/RHSA-2016-2585.html