Description of problem: 82576 NICs max support vf is 7,however,modprobe igb max_vfs>7 leads to host reboot in loop.I enable kdump in host,however,didn't find vmcore on host. Version-Release number of selected component (if applicable): #uname -r 2.6.18-227.el5 #lspci | grep 82576 03:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01) 03:00.1 Ethernet controller: Intel Corporation 82576 Gigabit Network Connection (rev 01) #rpm -qa | grep kvm etherboot-roms-kvm-5.4.4-13.el5 kvm-tools-83-205.el5 etherboot-zroms-kvm-5.4.4-13.el5 kvm-qemu-img-83-205.el5 kvm-debuginfo-83-205.el5 kvm-83-205.el5 kmod-kvm-83-205.el5 How reproducible: 100% Steps to Reproduce: 1.modprobe modprobe -r igb 2.modprobe igb max_vfs=8 3. Actual results: host reboot in loop. Expected results: At least,can't lead to host reboot. Additional info: I also tested on rhel6,On rhel6,After issue command "modprobe igb max_vfs=8",host is still normal although the vfs number is still 7.
This is because of missing commit c0f2276f3601a96b29d4347c5938e9494e8e4e5d and should be fixed. Could you please verify that the following build fixes the issue https://brewweb.devel.redhat.com/taskinfo?taskID=2846207 Thanks for reporting
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release.
(In reply to comment #1) > This is because of missing commit c0f2276f3601a96b29d4347c5938e9494e8e4e5d and > should be fixed. Could you please verify that the following build fixes the > issue > https://brewweb.devel.redhat.com/taskinfo?taskID=2846207 > > Thanks for reporting I downloaded kernel-2.6.18-228.el5.bug628534.x86_64.rpm form https://brewweb.devel.redhat.com/taskinfo?taskID=2846207. I installed kernel-2.6.18-228.el5.bug628534.x86_64.rpm and tried 5 times,pass.didn't hit this issue again.
in kernel-2.6.18-229.el5 You can download this test kernel (or newer) from http://people.redhat.com/jwilson/el5 Detailed testing feedback is always welcomed.
can't reproduce , but on kernel 2.6.18-233.el5 , the host didn't reboot in loop or print dmesg like Tx Queue <0> TDH <0> TDT <9> next_to_use <9> next_to_clean <0> buffer_info[next_to_clean] time_stamp <fffe817d> next_to_watch <0> jiffies <fffe9390> desc.status <168000> igb 0000:01:00.0: Detected Tx Unit Hang Codereviewed,linux-2.6-net-igb-fix-tx-hang-when-loading-igb-with-max_vfs-7.patch is applied in kernel 2.6.18-233.el5 correctly.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2011-0017.html