[Bug 84781] New: The guest will hang after live migration.

[Bug 84781] New: The guest will hang after live migration.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=84781

            Bug ID: 84781
           Summary: The guest will hang after live migration.
           Product: Virtualization
           Version: unspecified
    Kernel Version: 3.17.0-rc1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: chao.zhou@intel.com
        Regression: No

Environment:
------------
Host OS (ia32/ia32e/IA64):ia32e
Guest OS (ia32/ia32e/IA64):ia32e
Guest OS Type (Linux/Windows):Linux
kvm.git Commit:fd2752352bbc98850d83b5448a288d8991590317
qemu.git Commit:e4d50d47a9eb15f42bdd561803a29a4d7c3eb8ec
Host Kernel Version:3.17.0-rc1
Hardware:Ivytown_EP, Haswell_EP


Bug detailed description:
--------------------------
after guest live migration, the guest will hang, and ping guest's fail.

note:
1. after guest save/restore, the guest will hang
2. This should be a kernel bug
kvm      + qemu     =  result
fd275235 + e4d50d47 =  bad
c77dcacb + e4d50d47 =  good


Reproduce steps:
----------------
1.Start a TCP daemon for migration
qemu-system-x86_64 -enable-kvm -m 4G -smp 4 -net nic,macaddr=00:12:31:45:41:23
-net tap,script=/etc/kvm/qemu-ifup rhel6u5.qcow -incoming tcp:localhost:4444
2. create guest
qemu-system-x86_64 -enable-kvm -m 4G -smp 4 -net nic,macaddr=00:12:31:45:41:23
-net tap,script=/etc/kvm/qemu-ifup rhel6u5.qcow
3. ctrl+alt+2 to change to qemu monitor
4. migrate tcp:localhost:4444


Current result:
----------------
guest hang after live migration or save/restore.

Expected result:
----------------
after live/migration or save/restore, the guest works fine.


Basic root-causing log:
----------------------

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[Bug 84781] The guest will hang after live migration.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=84781

--- Comment #1 from Zhou, Chao <chao.zhou@intel.com> ---
the first bad commit is:
commit cbcf2dd3b3d4d990610259e8d878fc8dc1f17d80
Author: Thomas Gleixner <tglx@linutronix.de>
Date:   Wed Jul 16 21:04:54 2014 +0000

    x86: kvm: Make kvm_get_time_and_clockread() nanoseconds based

    Convert the relevant base data right away to nanoseconds instead of
    doing the conversion on every readout. Reduces text size by 160 bytes.

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Cc: Gleb Natapov <gleb@kernel.org>
    Cc: kvm@vger.kernel.org
    Acked-by: Paolo Bonzini <pbonzini@redhat.com>
    Signed-off-by: John Stultz <john.stultz@linaro.org>

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[Bug 84781] The guest will hang after live migration.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=84781

Paolo Bonzini <bonzini@gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bonzini@gnu.org

--- Comment #2 from Paolo Bonzini <bonzini@gnu.org> ---
Chao, can you test a more recent 3.17-rc version (3.17-rc4 or newer)?  It
should be fixed already.

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[Bug 84781] The guest will hang after live migration.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=84781

--- Comment #3 from Zhou, Chao <chao.zhou@intel.com> ---
test the bug on linux.git
Commit: 2ce7598c9a453e0acd0e07be7be3f5eb39608ebd
Kernel 3.17.0-rc4
Commit: d9773ceabfaf3f27b8a36fac035b74ee599df900
kernel :3.17.0-rc5+

after live migration, the guest works fine, the bug can't reproduce.

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[Bug 84781] The guest will hang after live migration.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=84781

Paolo Bonzini <bonzini@gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |CODE_FIX

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