This bug should be a top priority because people will suffer from it as soon as they reboot their 14.04 LTS with an Intel Gigabit NIC and the "current" Utopic kernel (3.16.0-48-generic).
I had the same problem with HP ProLiant DL380e Gen8 which an Intel I350 Gigabit NIC (Hewlett-Packard Company Ethernet 1Gb 4-port 366i Adapter) It was hard to get a shell with 30-50% packets drop and igb driver resetting ALL NICs... "blind-typing" on the shell and wait 1-2 minutes to get the output... of dmesg ;-) I updated the kernel of 14.04 LTS from Utopic to Vivid and everything is working again. Workaround is: screen -S kernel apt-get -y purge linux-{headers,image,image-extra}-3.16.0-48-generic apt-get -y install linux-image-generic-lts-vivid linux-headers-generic-lts-vivid reboot Output of dmesg: igb 0000:02:00.1 em2: igb: em2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX igb 0000:02:00.1: Detected Tx Unit Hang Tx Queue <3> TDH <0> TDT <0> next_to_use <4> next_to_clean <0> buffer_info[next_to_clean] time_stamp <100039540> next_to_watch <ffff880230b0e030> jiffies <1000397b6> desc.status <0> igb 0000:02:00.1 em2: Reset adapter igb 0000:02:00.2 em3: Reset adapter igb 0000:02:00.0 em1: Reset adapter igb 0000:02:00.0 em1: igb: em1 NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX igb 0000:02:00.1 em2: igb: em2 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX igb 0000:02:00.1: Detected Tx Unit Hang -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1492146 Title: igb Detected Tx Unit Hang To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1492146/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs