I'm trying  ethtool -K em1 tso off gso off lro off and it's doesn't
help.

igb driver version is the same in 46 and 48 version of kernel. Seems
that something changed in the kernel but not in the igb driver.

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https://bugs.launchpad.net/bugs/1492146

Title:
  igb Detected Tx Unit Hang

Status in linux-lts-utopic package in Ubuntu:
  Confirmed

Bug description:
  Hello!

  Have a:

  >lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 14.04.3 LTS
  Release:        14.04
  Codename:       trusty

  with kenel 3.16.0-46-generic.

  Today i do dist-upgrade and kernel was upgraded to 3.16.0-48-generic
  version.

  After reboot i've got this:

  Sep  4 09:02:52 mail kernel: [  310.616324] igb 0000:02:00.0 em1: Reset 
adapter Sep  4 09:02:52 mail kernel: [  310.831157] igb 0000:02:00.1 em2: Reset 
adapter Sep  4 09:02:56 mail kernel: [  315.154686] igb 0000:02:00.0 em1: igb: 
em1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX Sep  4 09:02:56 mail 
kernel: [  315.202651] igb 0000:02:00.1 em2: igb: em2 NIC Link is Up 1000 Mbps 
Full Duplex, Flow Control: RX Sep  4 09:03:02 mail kernel: [  321.608099] igb 
0000:02:00.0: Detected Tx Unit Hang
  Sep  4 09:03:02 mail kernel: [  321.608099]   Tx Queue             <6>
  Sep  4 09:03:02 mail kernel: [  321.608099]   TDH                  <23>
  Sep  4 09:03:02 mail kernel: [  321.608099]   TDT                  <23>
  Sep  4 09:03:02 mail kernel: [  321.608099]   next_to_use          <25>
  Sep  4 09:03:02 mail kernel: [  321.608099]   next_to_clean        <23>
  Sep  4 09:03:02 mail kernel: [  321.608099] buffer_info[next_to_clean]
  Sep  4 09:03:02 mail kernel: [  321.608099]   time_stamp           <1000012af>
  Sep  4 09:03:02 mail kernel: [  321.608099]   next_to_watch        
<ffff880272571240>
  Sep  4 09:03:02 mail kernel: [  321.608099]   jiffies              <100001531>
  Sep  4 09:03:02 mail kernel: [  321.608099]   desc.status          <120200>
  Sep  4 09:03:04 mail kernel: [  323.607349] igb 0000:02:00.0: Detected Tx 
Unit Hang
  Sep  4 09:03:04 mail kernel: [  323.607349]   Tx Queue             <6>
  Sep  4 09:03:04 mail kernel: [  323.607349]   TDH                  <23>
  Sep  4 09:03:04 mail kernel: [  323.607349]   TDT                  <23>
  Sep  4 09:03:04 mail kernel: [  323.607349]   next_to_use          <25>
  Sep  4 09:03:04 mail kernel: [  323.607349]   next_to_clean        <23>
  Sep  4 09:03:04 mail kernel: [  323.607349] buffer_info[next_to_clean]
  Sep  4 09:03:04 mail kernel: [  323.607349]   time_stamp           <1000012af>
  Sep  4 09:03:04 mail kernel: [  323.607349]   next_to_watch        
<ffff880272571240>
  Sep  4 09:03:04 mail kernel: [  323.607349]   jiffies              <100001725>
  Sep  4 09:03:04 mail kernel: [  323.607349]   desc.status          <120200>
  Sep  4 09:03:06 mail kernel: [  325.606602] igb 0000:02:00.0: Detected Tx 
Unit Hang
  Sep  4 09:03:06 mail kernel: [  325.606602]   Tx Queue             <6>
  Sep  4 09:03:06 mail kernel: [  325.606602]   TDH                  <23>
  Sep  4 09:03:06 mail kernel: [  325.606602]   TDT                  <23>
  Sep  4 09:03:06 mail kernel: [  325.606602]   next_to_use          <25>
  Sep  4 09:03:06 mail kernel: [  325.606602]   next_to_clean        <23>
  Sep  4 09:03:06 mail kernel: [  325.606602] buffer_info[next_to_clean]
  Sep  4 09:03:06 mail kernel: [  325.606602]   time_stamp           <1000012af>
  Sep  4 09:03:06 mail kernel: [  325.606602]   next_to_watch        
<ffff880272571240>
  Sep  4 09:03:06 mail kernel: [  325.606602]   jiffies              <100001919>
  Sep  4 09:03:06 mail kernel: [  325.606602]   desc.status          <120200>

  All network connections droped after that. System still unusable.

  Only after boot with old linux-image-3.16.0-46-generic my production
  mail server can work.

  It's a critical bug for me, can anybody help me?

  ethtool -i em1
  driver: igb
  version: 5.2.13-k
  firmware-version: 1.61, 0x80000cd5, 1.949.0
  bus-info: 0000:02:00.0
  supports-statistics: yes
  supports-test: yes
  supports-eeprom-access: yes
  supports-register-dump: yes
  supports-priv-flags: no

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