[Kernel-packages] [Bug 1524259] Re: igb: Detected Tx Unit Hang with stack trace

2016-01-04 Thread mrk
Sorry for delay. It's 4.4.0-040400rc4.201512061930 amd64.

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Title:
  igb: Detected Tx Unit Hang with stack trace

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello.

  For some time now we have a problem with one of our servers, that
  happens sporadically (once in a day or two days) and causes are not
  still known. We searched on lauchpad and tried many possible
  solutions, but nothing helped. We had tried vanilla Ubuntu 14.04.3
  kernel - 3.16.x, and also 3.19.0-25-generic and linux-
  image-3.19.0-33-generic - the same symptoms on all of these versions.
  We also tried to rollback to 3.13: 3.13.0-43-generic and
  3.13.0-62-generic, but the problem still persists.

  Our current configuration is: Ubuntu 14.04.3 with kernel 3.13.0-43.72
  with Xen 4.4.2-0ubuntu0.14.04.3 (this host is used as xen hypervisor
  with iSCSI initiator if it is important). And here is how it's going:

  kernel: [135522.062941] igb :01:00.1: Detected Tx Unit Hang
  kernel: [135522.062941]   Tx Queue <5>
  kernel: [135522.062941]   TDH  
  kernel: [135522.062941]   TDT  <21>
  kernel: [135522.062941]   next_to_use  <21>
  kernel: [135522.062941]   next_to_clean
  kernel: [135522.062941] buffer_info[next_to_clean]
  kernel: [135522.062941]   time_stamp   <10203c3ca>
  kernel: [135522.062941]   next_to_watch
  kernel: [135522.062941]   jiffies  <10203c4e6>
  kernel: [135522.062941]   desc.status  <1c8200>
  kernel: [135526.063054]   desc.status  <0>

  Many of messages like this. Right after that we have reports like:
  kernel: [135526.982825]  connection2:0: ping timeout of 5 secs expired, recv 
timeout 5, last rx 4328767466, last ping 4328768718, now 4328769972
  kernel: [135526.982911]  connection2:0: detected conn error (1011)

  And finally:

  kernel: [135527.014836] WARNING: CPU: 8 PID: 0 at 
/build/buildd/linux-3.13.0/net/sched/sch_generic.c:264 
dev_watchdog+0x276/0x280()
  kernel: [135527.014839] NETDEV WATCHDOG: eth1 (igb): transmit queue 4 timed 
out
  kernel: [135527.014841] Modules linked in: xt_physdev xen_netback xen_blkback 
cls_u32 sch_sfq sch_htb xt_tcpudp iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 
nf_nat_ipv4 xen_gntdev xen_evtchn xenfs xen_privcmd ip6_tables ib_iser rdma_cm 
iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi 
scsi_transport_iscsi gpio_ich joydev ioatdma serio_raw mac_hid shpchp lpc_ich 
i7core_edac intel_powerclamp coretemp edac_core lp parport hid_generic usbhid 
hid raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx 
xor raid6_pq raid1 raid0 multipath linear iptable_raw nf_nat nf_conntrack 
iptable_mangle iptable_filter psmouse ip_tables igb x_tables ahci libahci 
i2c_algo_bit dca ptp bridge pps_core 8021q garp stp llc mrp
  kernel: [135527.014903] CPU: 8 PID: 0 Comm: swapper/8 Not tainted 
3.13.0-43-generic #72-Ubuntu
  kernel: [135527.014905] Hardware name: Supermicro X8DTU/X8DTU, BIOS 2.1c  
 08/03/2012
  kernel: [135527.014907]  0009 880268103d98 81720bf6 
880268103de0
  kernel: [135527.014912]  880268103dd0 810677cd 0004 
880250b18000
  kernel: [135527.014916]  8800030e5940 0008 0008 
880268103e30
  kernel: [135527.014920] Call Trace:
  kernel: [135527.014923][] dump_stack+0x45/0x56
  kernel: [135527.014934]  [] warn_slowpath_common+0x7d/0xa0
  kernel: [135527.014937]  [] warn_slowpath_fmt+0x4c/0x50
  kernel: [135527.014943]  [] dev_watchdog+0x276/0x280
  kernel: [135527.014947]  [] ? dev_graft_qdisc+0x80/0x80
  kernel: [135527.014952]  [] call_timer_fn+0x36/0x100
  kernel: [135527.014955]  [] ? dev_graft_qdisc+0x80/0x80
  kernel: [135527.014959]  [] run_timer_softirq+0x1ef/0x2f0
  kernel: [135527.014964]  [] __do_softirq+0xec/0x2c0
  kernel: [135527.014969]  [] irq_exit+0x105/0x110
  kernel: [135527.014976]  [] xen_evtchn_do_upcall+0x35/0x50
  kernel: [135527.014981]  [] 
xen_do_hypervisor_callback+0x1e/0x30
  kernel: [135527.014982][] ? 
xen_hypercall_sched_op+0xa/0x20
  kernel: [135527.014990]  [] ? 
xen_hypercall_sched_op+0xa/0x20
  kernel: [135527.014996]  [] ? xen_safe_halt+0x10/0x20
  kernel: [135527.015001]  [] ? default_idle+0x1f/0xc0
  kernel: [135527.015005]  [] ? arch_cpu_idle+0x26/0x30
  kernel: [135527.015010]  [] ? cpu_startup_entry+0xc5/0x290
  kernel: [135527.015015]  [] ? cpu_bringup_and_idle+0x18/0x20
  kernel: [135527.015018] ---[ end trace 431e88429488f9a4 ]---
  kernel: [135527.015044] igb :01:00.1 eth1: Reset adapter

  Then the network connection to this machine is dead and it tries to
  reconnect continuously, but with no success.

  We had no problems after rollback to 3.13.0-43 kernel in about a week,
  but now it's cont

[Kernel-packages] [Bug 1524259] Re: igb: Detected Tx Unit Hang with stack trace

2015-12-29 Thread mrk
Hello. So our 4.4 servers work like a charm with 4.4 kernel for 18 days.
Looks like the bug is fixed in mainline kernel.

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https://bugs.launchpad.net/bugs/1524259

Title:
  igb: Detected Tx Unit Hang with stack trace

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello.

  For some time now we have a problem with one of our servers, that
  happens sporadically (once in a day or two days) and causes are not
  still known. We searched on lauchpad and tried many possible
  solutions, but nothing helped. We had tried vanilla Ubuntu 14.04.3
  kernel - 3.16.x, and also 3.19.0-25-generic and linux-
  image-3.19.0-33-generic - the same symptoms on all of these versions.
  We also tried to rollback to 3.13: 3.13.0-43-generic and
  3.13.0-62-generic, but the problem still persists.

  Our current configuration is: Ubuntu 14.04.3 with kernel 3.13.0-43.72
  with Xen 4.4.2-0ubuntu0.14.04.3 (this host is used as xen hypervisor
  with iSCSI initiator if it is important). And here is how it's going:

  kernel: [135522.062941] igb :01:00.1: Detected Tx Unit Hang
  kernel: [135522.062941]   Tx Queue <5>
  kernel: [135522.062941]   TDH  
  kernel: [135522.062941]   TDT  <21>
  kernel: [135522.062941]   next_to_use  <21>
  kernel: [135522.062941]   next_to_clean
  kernel: [135522.062941] buffer_info[next_to_clean]
  kernel: [135522.062941]   time_stamp   <10203c3ca>
  kernel: [135522.062941]   next_to_watch
  kernel: [135522.062941]   jiffies  <10203c4e6>
  kernel: [135522.062941]   desc.status  <1c8200>
  kernel: [135526.063054]   desc.status  <0>

  Many of messages like this. Right after that we have reports like:
  kernel: [135526.982825]  connection2:0: ping timeout of 5 secs expired, recv 
timeout 5, last rx 4328767466, last ping 4328768718, now 4328769972
  kernel: [135526.982911]  connection2:0: detected conn error (1011)

  And finally:

  kernel: [135527.014836] WARNING: CPU: 8 PID: 0 at 
/build/buildd/linux-3.13.0/net/sched/sch_generic.c:264 
dev_watchdog+0x276/0x280()
  kernel: [135527.014839] NETDEV WATCHDOG: eth1 (igb): transmit queue 4 timed 
out
  kernel: [135527.014841] Modules linked in: xt_physdev xen_netback xen_blkback 
cls_u32 sch_sfq sch_htb xt_tcpudp iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 
nf_nat_ipv4 xen_gntdev xen_evtchn xenfs xen_privcmd ip6_tables ib_iser rdma_cm 
iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi 
scsi_transport_iscsi gpio_ich joydev ioatdma serio_raw mac_hid shpchp lpc_ich 
i7core_edac intel_powerclamp coretemp edac_core lp parport hid_generic usbhid 
hid raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx 
xor raid6_pq raid1 raid0 multipath linear iptable_raw nf_nat nf_conntrack 
iptable_mangle iptable_filter psmouse ip_tables igb x_tables ahci libahci 
i2c_algo_bit dca ptp bridge pps_core 8021q garp stp llc mrp
  kernel: [135527.014903] CPU: 8 PID: 0 Comm: swapper/8 Not tainted 
3.13.0-43-generic #72-Ubuntu
  kernel: [135527.014905] Hardware name: Supermicro X8DTU/X8DTU, BIOS 2.1c  
 08/03/2012
  kernel: [135527.014907]  0009 880268103d98 81720bf6 
880268103de0
  kernel: [135527.014912]  880268103dd0 810677cd 0004 
880250b18000
  kernel: [135527.014916]  8800030e5940 0008 0008 
880268103e30
  kernel: [135527.014920] Call Trace:
  kernel: [135527.014923][] dump_stack+0x45/0x56
  kernel: [135527.014934]  [] warn_slowpath_common+0x7d/0xa0
  kernel: [135527.014937]  [] warn_slowpath_fmt+0x4c/0x50
  kernel: [135527.014943]  [] dev_watchdog+0x276/0x280
  kernel: [135527.014947]  [] ? dev_graft_qdisc+0x80/0x80
  kernel: [135527.014952]  [] call_timer_fn+0x36/0x100
  kernel: [135527.014955]  [] ? dev_graft_qdisc+0x80/0x80
  kernel: [135527.014959]  [] run_timer_softirq+0x1ef/0x2f0
  kernel: [135527.014964]  [] __do_softirq+0xec/0x2c0
  kernel: [135527.014969]  [] irq_exit+0x105/0x110
  kernel: [135527.014976]  [] xen_evtchn_do_upcall+0x35/0x50
  kernel: [135527.014981]  [] 
xen_do_hypervisor_callback+0x1e/0x30
  kernel: [135527.014982][] ? 
xen_hypercall_sched_op+0xa/0x20
  kernel: [135527.014990]  [] ? 
xen_hypercall_sched_op+0xa/0x20
  kernel: [135527.014996]  [] ? xen_safe_halt+0x10/0x20
  kernel: [135527.015001]  [] ? default_idle+0x1f/0xc0
  kernel: [135527.015005]  [] ? arch_cpu_idle+0x26/0x30
  kernel: [135527.015010]  [] ? cpu_startup_entry+0xc5/0x290
  kernel: [135527.015015]  [] ? cpu_bringup_and_idle+0x18/0x20
  kernel: [135527.015018] ---[ end trace 431e88429488f9a4 ]---
  kernel: [135527.015044] igb :01:00.1 eth1: Reset adapter

  Then the network connection to this machine is dead and it tries to
  reconnect continuously, but with no success.

  We had no problems after ro

[Kernel-packages] [Bug 1524259] Re: igb: Detected Tx Unit Hang with stack trace

2015-12-10 Thread mrk
I just booted the server into latest 4.4 kernel using packages you
pointed to me. But triggering of the issue may took couple of days. Last
longer uptime we had with 3.13.0-43-generic was about a week. Anyway,
I'll report here the news.

PS. I wasn't able to `apport-collect 1524259`. It opened lynx and when I
try to type my username to login on launchpad, it redirects me to page
source. Is it possible to run this command on headless machine?

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1524259

Title:
  igb: Detected Tx Unit Hang with stack trace

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello.

  For some time now we have a problem with one of our servers, that
  happens sporadically (once in a day or two days) and causes are not
  still known. We searched on lauchpad and tried many possible
  solutions, but nothing helped. We had tried vanilla Ubuntu 14.04.3
  kernel - 3.16.x, and also 3.19.0-25-generic and linux-
  image-3.19.0-33-generic - the same symptoms on all of these versions.
  We also tried to rollback to 3.13: 3.13.0-43-generic and
  3.13.0-62-generic, but the problem still persists.

  Our current configuration is: Ubuntu 14.04.3 with kernel 3.13.0-43.72
  with Xen 4.4.2-0ubuntu0.14.04.3 (this host is used as xen hypervisor
  with iSCSI initiator if it is important). And here is how it's going:

  kernel: [135522.062941] igb :01:00.1: Detected Tx Unit Hang
  kernel: [135522.062941]   Tx Queue <5>
  kernel: [135522.062941]   TDH  
  kernel: [135522.062941]   TDT  <21>
  kernel: [135522.062941]   next_to_use  <21>
  kernel: [135522.062941]   next_to_clean
  kernel: [135522.062941] buffer_info[next_to_clean]
  kernel: [135522.062941]   time_stamp   <10203c3ca>
  kernel: [135522.062941]   next_to_watch
  kernel: [135522.062941]   jiffies  <10203c4e6>
  kernel: [135522.062941]   desc.status  <1c8200>
  kernel: [135526.063054]   desc.status  <0>

  Many of messages like this. Right after that we have reports like:
  kernel: [135526.982825]  connection2:0: ping timeout of 5 secs expired, recv 
timeout 5, last rx 4328767466, last ping 4328768718, now 4328769972
  kernel: [135526.982911]  connection2:0: detected conn error (1011)

  And finally:

  kernel: [135527.014836] WARNING: CPU: 8 PID: 0 at 
/build/buildd/linux-3.13.0/net/sched/sch_generic.c:264 
dev_watchdog+0x276/0x280()
  kernel: [135527.014839] NETDEV WATCHDOG: eth1 (igb): transmit queue 4 timed 
out
  kernel: [135527.014841] Modules linked in: xt_physdev xen_netback xen_blkback 
cls_u32 sch_sfq sch_htb xt_tcpudp iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 
nf_nat_ipv4 xen_gntdev xen_evtchn xenfs xen_privcmd ip6_tables ib_iser rdma_cm 
iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi 
scsi_transport_iscsi gpio_ich joydev ioatdma serio_raw mac_hid shpchp lpc_ich 
i7core_edac intel_powerclamp coretemp edac_core lp parport hid_generic usbhid 
hid raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx 
xor raid6_pq raid1 raid0 multipath linear iptable_raw nf_nat nf_conntrack 
iptable_mangle iptable_filter psmouse ip_tables igb x_tables ahci libahci 
i2c_algo_bit dca ptp bridge pps_core 8021q garp stp llc mrp
  kernel: [135527.014903] CPU: 8 PID: 0 Comm: swapper/8 Not tainted 
3.13.0-43-generic #72-Ubuntu
  kernel: [135527.014905] Hardware name: Supermicro X8DTU/X8DTU, BIOS 2.1c  
 08/03/2012
  kernel: [135527.014907]  0009 880268103d98 81720bf6 
880268103de0
  kernel: [135527.014912]  880268103dd0 810677cd 0004 
880250b18000
  kernel: [135527.014916]  8800030e5940 0008 0008 
880268103e30
  kernel: [135527.014920] Call Trace:
  kernel: [135527.014923][] dump_stack+0x45/0x56
  kernel: [135527.014934]  [] warn_slowpath_common+0x7d/0xa0
  kernel: [135527.014937]  [] warn_slowpath_fmt+0x4c/0x50
  kernel: [135527.014943]  [] dev_watchdog+0x276/0x280
  kernel: [135527.014947]  [] ? dev_graft_qdisc+0x80/0x80
  kernel: [135527.014952]  [] call_timer_fn+0x36/0x100
  kernel: [135527.014955]  [] ? dev_graft_qdisc+0x80/0x80
  kernel: [135527.014959]  [] run_timer_softirq+0x1ef/0x2f0
  kernel: [135527.014964]  [] __do_softirq+0xec/0x2c0
  kernel: [135527.014969]  [] irq_exit+0x105/0x110
  kernel: [135527.014976]  [] xen_evtchn_do_upcall+0x35/0x50
  kernel: [135527.014981]  [] 
xen_do_hypervisor_callback+0x1e/0x30
  kernel: [135527.014982][] ? 
xen_hypercall_sched_op+0xa/0x20
  kernel: [135527.014990]  [] ? 
xen_hypercall_sched_op+0xa/0x20
  kernel: [135527.014996]  [] ? xen_safe_halt+0x10/0x20
  kernel: [135527.015001]  [] ? default_idle+0x1f/0xc0
  kernel: [135527.015005]  [] ? arch_cpu_idle+0x26/0x30
  kernel: [135527.015010]  [] ? cpu_startup_entry+0xc5/0x290
  kernel: [1

[Kernel-packages] [Bug 1492146] Re: igb Detected Tx Unit Hang

2015-11-21 Thread mrk
The igb clash appears sporadically, once in two days or so. I can't reliably 
reproduce it - only by waiting for couple of days until it breaks.
We seeing that in Ubuntu 14.04 with xen hypervisor 4.4.2-0ubuntu0.14.04.3 
installed.

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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
Status in linux-lts-utopic source package in Trusty:
  Fix Released

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 :02:00.0 em1: Reset 
adapter Sep  4 09:02:52 mail kernel: [  310.831157] igb :02:00.1 em2: Reset 
adapter Sep  4 09:02:56 mail kernel: [  315.154686] igb :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 :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 
: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   <112af>
  Sep  4 09:03:02 mail kernel: [  321.608099]   next_to_watch

  Sep  4 09:03:02 mail kernel: [  321.608099]   jiffies  <11531>
  Sep  4 09:03:02 mail kernel: [  321.608099]   desc.status  <120200>
  Sep  4 09:03:04 mail kernel: [  323.607349] igb :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   <112af>
  Sep  4 09:03:04 mail kernel: [  323.607349]   next_to_watch

  Sep  4 09:03:04 mail kernel: [  323.607349]   jiffies  <11725>
  Sep  4 09:03:04 mail kernel: [  323.607349]   desc.status  <120200>
  Sep  4 09:03:06 mail kernel: [  325.606602] igb :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   <112af>
  Sep  4 09:03:06 mail kernel: [  325.606602]   next_to_watch

  Sep  4 09:03:06 mail kernel: [  325.606602]   jiffies  <11919>
  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, 0x8cd5, 1.949.0
  bus-info: :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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[Kernel-packages] [Bug 1492146] Re: igb Detected Tx Unit Hang

2015-11-21 Thread mrk
Hello,

any news on this one? We also expecting this problem on two servers -
with kernel 3.19.0-33-generic #38~14.04.1-Ubuntu. Anything we can do to
make this fixed asap? I'm open to any tests. Thank you!

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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
Status in linux-lts-utopic source package in Trusty:
  Fix Released

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 :02:00.0 em1: Reset 
adapter Sep  4 09:02:52 mail kernel: [  310.831157] igb :02:00.1 em2: Reset 
adapter Sep  4 09:02:56 mail kernel: [  315.154686] igb :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 :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 
: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   <112af>
  Sep  4 09:03:02 mail kernel: [  321.608099]   next_to_watch

  Sep  4 09:03:02 mail kernel: [  321.608099]   jiffies  <11531>
  Sep  4 09:03:02 mail kernel: [  321.608099]   desc.status  <120200>
  Sep  4 09:03:04 mail kernel: [  323.607349] igb :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   <112af>
  Sep  4 09:03:04 mail kernel: [  323.607349]   next_to_watch

  Sep  4 09:03:04 mail kernel: [  323.607349]   jiffies  <11725>
  Sep  4 09:03:04 mail kernel: [  323.607349]   desc.status  <120200>
  Sep  4 09:03:06 mail kernel: [  325.606602] igb :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   <112af>
  Sep  4 09:03:06 mail kernel: [  325.606602]   next_to_watch

  Sep  4 09:03:06 mail kernel: [  325.606602]   jiffies  <11919>
  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, 0x8cd5, 1.949.0
  bus-info: :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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