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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

K-Data Systems, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 1081748
When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

** Summary changed:

- moving large amounts of data with hyper-v server causes lockup
+ WARNING: at /build/buildd/linux-3.2.0/kernel/softirq.c:159 local_bh_enable+0x7a/0xa0()

** Tags added: needs-kernel-logs needs-upstream-testing regression-
potential

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1081748

Title:
  WARNING: at /build/buildd/linux-3.2.0/kernel/softirq.c:159
  local_bh_enable+0x7a/0xa0()

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I receive the following stack trace in my dmesg output and I lose
  connection to my server when moving a large amount of data on my
  Ubuntu 12.04 lts server that is on Hyper-V. This happens when copying
  data from my server over scp to another server or even tarring up a
  local directory on the server. If I throttle the backup for example
  with the pv command to 50mbps I dont have any problems. I monitor my
  server with Nagios and it always says it went offline when moving
  large amounts of data. I am not sure what else to go on.

  Linux http5.server 3.2.0-33-generic #52-Ubuntu SMP Thu Oct 18 16:29:15
  UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

  [32607.861148] ------------[ cut here ]------------
  [32607.861435] WARNING: at /build/buildd/linux-3.2.0/kernel/softirq.c:159 local_bh_enable+0x7a/0xa0()
  [32607.861440] Hardware name: Virtual Machine
  [32607.861442] Modules linked in: xt_multiport xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables x_tables vesafb joydev psmouse hid_hyperv hid serio_raw i2c_piix4 lp mac_hid parport hv_netvsc hv_utils hv_storvsc floppy hv_vmbus
  [32607.861478] Pid: 0, comm: swapper/0 Not tainted 3.2.0-33-generic #52-Ubuntu
  [32607.861481] Call Trace:
  [32607.861484]  <IRQ>  [<ffffffff81066f4f>] warn_slowpath_common+0x7f/0xc0
  [32607.861495]  [<ffffffff81066faa>] warn_slowpath_null+0x1a/0x20
  [32607.861500]  [<ffffffff8106dd7a>] local_bh_enable+0x7a/0xa0
  [32607.861508]  [<ffffffffa002fafe>] netvsc_linkstatus_callback+0xbe/0x160 [hv_netvsc]
  [32607.861514]  [<ffffffffa003104f>] rndis_filter_receive+0xff/0x180 [hv_netvsc]
  [32607.861521]  [<ffffffffa003033f>] netvsc_receive+0x23f/0x2d0 [hv_netvsc]
  [32607.861527]  [<ffffffffa003052b>] netvsc_channel_cb+0x15b/0x190 [hv_netvsc]
  [32607.861535]  [<ffffffffa0001649>] vmbus_on_event+0xa9/0x110 [hv_vmbus]
  [32607.861541]  [<ffffffff8106e0e8>] tasklet_action+0x78/0x140
  [32607.861547]  [<ffffffff8106e728>] __do_softirq+0xa8/0x210
  [32607.861554]  [<ffffffff81060d2a>] ? scheduler_tick+0x13a/0x2f0
  [32607.861562]  [<ffffffff8166586c>] call_softirq+0x1c/0x30
  [32607.861568]  [<ffffffff81015305>] do_softirq+0x65/0xa0
  [32607.861573]  [<ffffffff8106eb0e>] irq_exit+0x8e/0xb0
  [32607.861579]  [<ffffffff8166620e>] smp_apic_timer_interrupt+0x6e/0x99
  [32607.861583]  [<ffffffff816640de>] apic_timer_interrupt+0x6e/0x80
  [32607.861586]  <EOI>  [<ffffffff81090d05>] ? sched_clock_local+0x25/0x90
  [32607.861597]  [<ffffffff8103cf8b>] ? native_safe_halt+0xb/0x10
  [32607.861603]  [<ffffffff8101b983>] default_idle+0x53/0x1d0
  [32607.861608]  [<ffffffff81012236>] cpu_idle+0xd6/0x120
  [32607.861619]  [<ffffffff8162166e>] rest_init+0x72/0x74
  [32607.861626]  [<ffffffff81cfbc03>] start_kernel+0x3b0/0x3bd
  [32607.861632]  [<ffffffff81cfb388>] x86_64_start_reservations+0x132/0x136
  [32607.861637]  [<ffffffff81cfb140>] ? early_idt_handlers+0x140/0x140
  [32607.861642]  [<ffffffff81cfb459>] x86_64_start_kernel+0xcd/0xdc
  [32607.861645] ---[ end trace ff5ae60d77ec44cd ]---
  [32607.865515] hv_vmbus: child device \xffffffe0yV\xffffffdd\x02\xffffff88\xffffffff\xffffffff9 unregistered
  [32607.865758] hv_vmbus: child device  unregistered

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