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[Tedesco <tedesco@xxxxxxxxx>]

I have the same problem
FUJITSU Server PRIMERGY RX1330 M1
-cpu
          product: Intel(R) Xeon(R) CPU E3-1220 v3 @ 3.10GHz
          vendor: Intel Corp.
          physical id: 1
          bus info: cpu@0
          size: 3100MHz
          capacity: 3100MHz
          width: 64 bits
-network
                description: Ethernet interface
                product: I210 Gigabit Network Connection
                vendor: Intel Corporation
                physical id: 0
                bus info: pci@0000:02:00.0
                logical name: em1
                version: 03
                serial: 90:1b:0e:10:34:96
                size: 100Mbit/s
                capacity: 1Gbit/s
                width: 32 bits
                clock: 33MHz
-network
                description: Ethernet interface
                product: I210 Gigabit Network Connection
                vendor: Intel Corporation
                physical id: 0
                bus info: pci@0000:03:00.0
                logical name: em2
                version: 03
                serial: 90:1b:0e:10:32:82
                size: 100Mbit/s
                capacity: 1Gbit/s
                width: 32 bits
                clock: 33MHz

** Attachment added: "Only the log data of the syslog of ubuntu server Ubuntu 14.04.3 LTS (GNU/Linux 3.16.0-48-generic x86_64)"
   https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1492146/+attachment/4459121/+files/syslog

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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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