[Qemu-devel] [Bug 1293975] Re: Guest is destroyed after live migration

[Dr. David Alan Gilbert]

Can you capture a backtrace for the failure? Is the seg happening in the
source or destination qemu?

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https://bugs.launchpad.net/bugs/1293975

Title:
  Guest is destroyed after live migration

Status in QEMU:
  New

Bug description:
  Environment:
  ------------
  Host OS (ia32/ia32e/IA64):ia32e
  Guest OS (ia32/ia32e/IA64):ia32e
  Guest OS Type (Linux/Windows):Linux
  kvm.git Commit:8fbb1daf3e8254afc17fc4490b69db00920197ae
  qemu.git Commit: 6fffa26244737f8fd8641a21fee29bd6aa9fdff5
  Host Kernel Version:3.14.0-rc3
  Hardware:Romley_EP, Ivytown_EP

  
  Bug detailed description:
  --------------------------
  after live migration, the guest will be destroyed

  note:
  after save restore, the guest will be destroyed.

  Reproduce steps:
  ----------------
  1.Start a TCP daemon for migration
  qemu-system-x86_64 -enable-kvm -m 2048 -smp 2 -net none /root/rhel6u4.qcow 
-incoming tcp:localhost:4444
  2. create guest
  qemu-system-x86_64 -enable-kvm -m 2048 -smp 2 -net none /root/rhel6u4.qcow 
  3. ctrl+alt+2 to switch to qemu monitor
  4. migrate tcp:localhost:4444

  Current result:
  ----------------
  the guest will be destroyed

  Expected result:
  ----------------
  the guest works fine

  Basic root-causing log:
  ----------------------
  qemu-system-x86[15027]: segfault at 698 ip 00007f94be628166 sp 
00007f94bb820c58 error 6 in libc-2.12.so[7f94be5a5000+189000]

  
  Bisect result
  the first bad commit:
  commit 00c8cb0a36f51a6866a83c08962d12a0eb21864b
  Author: Andreas Färber <address@hidden>
  Date:   Wed Sep 4 02:19:44 2013 +0200

      cputlb: Change tlb_flush() argument to CPUState

      Signed-off-by: Andreas Färber <address@hidden>

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