Xen guests may hang after migration or suspend/resume

[David Vrabel]

[Impact]
Xen guests may hang during resume after a migration or suspend. The predominately affects HVM guests.

[Test Case]
Create a Xen guest and attempt to migrate or save/restore (suspend/resume) hundreds of times.

[Fix]
The following upstream commits (tagged for stable) fix the hangs.

"x86/xen: resume timer irqs early"
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=8d5999df35314607c38fbd6bdd709e25c3a4eeab

and

"xen/manage: Always freeze/thaw processes when suspend/resuming"
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=61a734d305e16944b42730ef582a7171dc733321

Both are clean cherry-picks.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1368724

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Tim Gardner (timg-tpi)]

Applied 61a734d305e16944b42730ef582a7171dc733321 to Utopic. 8d5999df35314607c38fbd6bdd709e25c3a4eeab came in via 3.16.2 (stable)

[David Vrabel (david-vrabel)]

FYI, resume is an integral part of migration or domain restore. I've adjusted the test case accordingly.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.16.0-16.22

---------------
linux (3.16.0-16.22) utopic; urgency=low

  [ Andy Whitcroft ]

  * Revert "SAUCE: x86/xen: Fix setup of 64bit kernel pagetables"
  * [Config] tools -- only build common tools when enabled
  * [Config] follow rename of DEB_BUILD_PROFILES

  [ Tim Gardner ]

  * [Debian] set do_*_tools after stage1 or bootstrap is determined
    - LP: #1370211
  * Release Tracking Bug
    - LP: #1370535

  [ Upstream Kernel Changes ]

  * x86/xen: don't copy bogus duplicate entries into kernel page tables
  * blk-merge: fix blk_recount_segments
    - LP: #1359146
  * igb: bring link up when PHY is powered up
    - LP: #1370018
  * igb: remove unnecessary break after goto
    - LP: #1370018
  * igb: remove unnecessary break after return
    - LP: #1370018
  * igb: Add message when malformed packets detected by hw
    - LP: #1370018
  * igb: bump igb version to 5.2.13
    - LP: #1370018
 -- Tim Gardner <email address hidden> Tue, 16 Sep 2014 10:19:04 -0600

[Brad Figg (brad-figg)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-trusty' to 'verification-done-trusty'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.13.0-37.64

---------------
linux (3.13.0-37.64) trusty; urgency=low

  [ Joseph Salisbury ]

  * Release Tracking Bug
    - LP: #1372576

  [ dann frazier ]

  * [Config] CONFIG_HW_RANDOM_XGENE=m on arm64

  [ Edward Lin ]

  * SAUCE: Add use_native_backlight quirk for Dell Inspiron 5721/3521
    - LP: #1354253, #1354313

  [ Tim Gardner ]

  * SAUCE: Fix nfs oops stable regression
    - LP: #1348670
  * [Config] Add mpt3sas to d-i
    - LP: #1368907
  * [Config] CONFIG_X86_16BIT=y
    - LP: #1371601

  [ Timo Aaltonen ]

  * SAUCE: i915_bdw: Rebase to v3.15.8
    - LP: #1359213

  [ Upstream Kernel Changes ]

  * Revert "x86-64, modify_ldt: Make support for 16-bit segments a runtime
    option"
    - LP: #1371601
  * mmc: rtsx: add R1-no-CRC mmc command type handle
    - LP: #1365378
  * rpc_pipe: remove the clntXX dir if creating the pipe fails
    - LP: #1365869
  * sunrpc: add an "info" file for the dummy gssd pipe
    - LP: #1365869
  * rpc_pipe: fix cleanup of dummy gssd directory when notification fails
    - LP: #1365869
  * hwrng: xgene - add support for APM X-Gene SoC RNG support
    - LP: #1365593
  * Documentation: rng: Add X-Gene SoC RNG driver documentation
    - LP: #1365593
  * arm64: dts: add random number generator dts node to APM X-Gene
    platform.
    - LP: #1365593
  * xen/balloon: cancel ballooning if adding new memory failed
    - LP: #1304001
  * x86/xen: resume timer irqs early
    - LP: #1368724
  * xen/manage: Always freeze/thaw processes when suspend/resuming
    - LP: #1368724
  * scsi_transport_sas: move bsg destructor into sas_rphy_remove
    - LP: #1368991
  * drm/i915: Enable 5.4Ghz (HBR2) link rate for Displayport 1.2-capable
    devices
    - LP: #1369633
  * bnx2x: Fix link for KR with swapped polarity lane
    - LP: #1370716
  * drm: add DRM_CAPs for cursor size
    - LP: #1359213
  * drm/dp: Add AUX channel infrastructure
    - LP: #1359213
  * drm/dp: Add drm_dp_dpcd_read_link_status()
    - LP: #1359213
  * drm/dp: Add DisplayPort link helpers
    - LP: #1359213
  * drm/dp: Allow registering AUX channels as I2C busses
    - LP: #1359213
  * drm/dp: let drivers specify the name of the I2C-over-AUX adapter
    - LP: #1359213
  * drm/dp: make aux retries less chatty
    - LP: #1359213
  * Bluetooth: Enable Atheros 0cf3:311e for firmware upload
    - LP: #1371477
  * bnx2x: fix crash during TSO tunneling
    - LP: #1371601
  * inetpeer: get rid of ip_id_count
    - LP: #1371601
  * ip: make IP identifiers less predictable
    - LP: #1371601
  * tcp: Fix integer-overflows in TCP veno
    - LP: #1371601
  * tcp: Fix integer-overflow in TCP vegas
    - LP: #1371601
  * macvlan: Initialize vlan_features to turn on offload support.
    - LP: #1371601
  * net: Correctly set segment mac_len in skb_segment().
    - LP: #1371601
  * iovec: make sure the caller actually wants anything in
    memcpy_fromiovecend
    - LP: #1371601
  * batman-adv: Fix out-of-order fragmentation support
    - LP: #1371601
  * sctp: fix possible seqlock seadlock in sctp_packet_transmit()
    - LP: #1371601
  * sparc64: Fix argument sign extension for compat_sys_futex().
    - LP: #1371601
  ...