kernel-packages team mailing list archive

[Chris Valean <cvalean@xxxxxxxxxxxxxxxxxxxxxx>]

This lts-trusty test kernel is not booting when installed on 12.04.5.

There are multiple events like this being recorded on the serial:
udevd[275]: timeout: killing '/sbin/modprobe -bv vmbus:394f16571591784eab55382f3bd5422d' [380]
udevd[246]: timeout: killing '/sbin/modprobe -bv vmbus:e7f4a0a9455a964db8278a841e8c03e6' [386]
udevd[249]: timeout: killing '/sbin/modprobe -bv vmbus:292efa3523ea364296ae3a6ebacba440' [394]

Removing the network card from the VM config, the system is booting normally.
Trying to boot the VM again with a NIC attached, the system is booting eventually, though we see the failed modprobe attempts.

There is also this call trace showing up that I was able to capture.
Will check with the peers from our end if we can identify the missing
patch or the one that's causing this.

[  361.072113] INFO: task modprobe:740 blocked for more than 120 seconds.
[  361.074061]       Not tainted 3.13.0-78-generic #122
[  361.075771] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  361.077886] modprobe        D ffff88007ce33180     0   740    656 0x00000004
[  361.077896]  ffff880078193bc0 0000000000000086 ffff880036b26000 0000000000013180
[  361.077901]  ffff880078193fd8 0000000000013180 ffff880036b26000 ffff88007b60c240
[  361.077905]  ffff88007b60c244 ffff880036b26000 00000000ffffffff ffff88007b60c248
[  361.077916] Call Trace:
[  361.077924]  [<ffffffff817294c9>] schedule_preempt_disabled+0x29/0x70
[  361.077930]  [<ffffffff8172b335>] __mutex_lock_slowpath+0x135/0x1b0
[  361.077938]  [<ffffffff81499e50>] ? __device_attach+0x40/0x40
[  361.077943]  [<ffffffff8172b3cf>] mutex_lock+0x1f/0x2f
[  361.077953]  [<ffffffff81499e99>] __driver_attach+0x49/0xa0
[  361.077958]  [<ffffffff81499e50>] ? __device_attach+0x40/0x40
[  361.077963]  [<ffffffff81497aa3>] bus_for_each_dev+0x63/0xa0
[  361.077970]  [<ffffffff8149950e>] driver_attach+0x1e/0x20
[  361.077975]  [<ffffffff814990f0>] bus_add_driver+0x180/0x250
[  361.077986]  [<ffffffff8149a564>] driver_register+0x64/0xf0
[  361.077996]  [<ffffffffa001bda7>] __vmbus_driver_register+0x57/0x60 [hv_vmbus]
[  361.078001]  [<ffffffffa0049000>] ? 0xffffffffa0048fff
[  361.078009]  [<ffffffffa004901e>] hv_kbd_init+0x1e/0x1000 [hyperv_keyboard]
[  361.078019]  [<ffffffff8100214a>] do_one_initcall+0xfa/0x1b0
[  361.078026]  [<ffffffff81059833>] ? set_memory_nx+0x43/0x50
[  361.078032]  [<ffffffff810e28fd>] load_module+0x12ed/0x1b50
[  361.078038]  [<ffffffff810de350>] ? store_uevent+0x40/0x40
[  361.078049]  [<ffffffff810e3202>] SyS_init_module+0xa2/0xf0
[  361.078054]  [<ffffffff817356dd>] system_call_fastpath+0x1a/0x1f

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-lts-utopic in Ubuntu.
https://bugs.launchpad.net/bugs/1454892

Title:
  [Hyper-V] hv_netvsc: Use the xmit_more skb flag to optimize signaling
  the host

Status in linux package in Ubuntu:
  In Progress
Status in linux-lts-trusty package in Ubuntu:
  In Progress
Status in linux-lts-utopic package in Ubuntu:
  Won't Fix
Status in linux-lts-trusty source package in Precise:
  In Progress
Status in linux source package in Trusty:
  In Progress
Status in linux-lts-utopic source package in Trusty:
  Won't Fix
Status in linux source package in Vivid:
  Fix Released
Status in linux source package in Wily:
  Fix Released

Bug description:
  hv_netvsc: Use the xmit_more skb flag to optimize signaling the host
  Based on the information given to this driver (via the xmit_more skb flag),
  we can defer signaling the host if more packets are on the way. This will help
  make the host more efficient since it can potentially process a larger batch of
  packets. Implement this optimization.

  Upstream commit: https://git.kernel.org/cgit/linux/kernel/git/davem
  /net-next.git/commit/?id=82fa3c776e5abba7ed6e4b4f4983d14731c37d6a

  This commit may imply other commits previously requested, for example
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1452074

  Requested for all typical Hyper-V targets: 15.10, 15.04, 14.10, 14.04,
  14.04 HWE, 12.02, and 12.02 HWE

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