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[Qemu-devel] [Bug 1257352] Re: kvm hangs occasionally when switching out


From: James Hunt
Subject: [Qemu-devel] [Bug 1257352] Re: kvm hangs occasionally when switching out of the qemu console
Date: Tue, 25 Mar 2014 10:53:58 -0000

HI Serge - yes, problem is still there with the ppa versions:

$ dpkg -l|egrep "kvm|qemu" 
ii  ipxe-qemu                                             
1.0.0+git-20131111.c3d1e78-2ubuntu1                 all          PXE boot 
firmware - ROM images for qemu
ii  kvm-ipxe                                              
1.0.0+git-20131111.c3d1e78-2ubuntu1                 all          transitional 
dummy package
ii  kvm-pxe                                               5.4.5                 
                              all          Meta package providing kvm pxe-boot 
ROMs.
ii  qemu-common                                           
2.0~git-20140320.71461b0-0ubuntu1                   all          dummy 
transitional package from qemu-common to qemu-keymaps
ii  qemu-keymaps                                          
2.0~git-20140320.71461b0-0ubuntu1                   all          QEMU keyboard 
maps
ii  qemu-kvm                                              
2.0~git-20140320.71461b0-0ubuntu1                   i386         QEMU Full 
virtualization on x86 hardware (transitional package)
ii  qemu-kvm-extras-static                                
1.2.0-2012.09-0ubuntu2                              all          QEMU static 
user mode emulation binaries (transitional package)
ii  qemu-system                                           
2.0~git-20140320.71461b0-0ubuntu1                   i386         QEMU full 
system emulation binaries
ii  qemu-system-arm                                       1.7.0+dfsg-3ubuntu7   
                              i386         QEMU full system emulation binaries 
(arm)
ii  qemu-system-common                                    
2.0~git-20140320.71461b0-0ubuntu1                   i386         QEMU full 
system emulation binaries (common files)
ii  qemu-system-mips                                      1.7.0+dfsg-3ubuntu7   
                              i386         QEMU full system emulation binaries 
(mips)
ii  qemu-system-misc                                      1.7.0+dfsg-3ubuntu7   
                              i386         QEMU full system emulation binaries 
(miscelaneous)
ii  qemu-system-ppc                                       1.7.0+dfsg-3ubuntu7   
                              i386         QEMU full system emulation binaries 
(ppc)
ii  qemu-system-sparc                                     1.7.0+dfsg-3ubuntu7   
                              i386         QEMU full system emulation binaries 
(sparc)
ii  qemu-system-x86                                       1.7.0+dfsg-3ubuntu7   
                              i386         QEMU full system emulation binaries 
(x86)
ii  qemu-user-static                                      
2.0~git-20140320.71461b0-0ubuntu1                   i386         QEMU user mode 
emulation binaries (static version)
ii  qemu-utils                                            
2.0~git-20140320.71461b0-0ubuntu1                   i386         QEMU utilities

-- 
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https://bugs.launchpad.net/bugs/1257352

Title:
  kvm hangs occasionally when switching out of the qemu console

Status in QEMU:
  New
Status in “qemu” package in Ubuntu:
  Confirmed

Bug description:
  To recreate (although this does *NOT* fail most of the time alas):

  1) press "ctrl-alt-2" to switch to the qemu console.
  2) type say "sendkey ctrl-alt-f1"
  3) press "ctrl-alt-1".

  Expected outcome: Switch to tty1 in the VM.

  Actual outcome: No switch to tty1 in the VM. and qemu console
  unresponsive to any keyboard input.

  
  Rather a vague problem description I'm afraid but this has happened to me 3 
times recently. No crash and no excessive CPU is observed.

  I'll grab an strace when it happens again and attach...

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: qemu-system-x86 1.6.0+dfsg-2ubuntu4
  ProcVersionSignature: Ubuntu 3.12.0-4.12-generic 3.12.1
  Uname: Linux 3.12.0-4-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.7-0ubuntu1
  Architecture: i386
  CurrentDesktop: Unity
  Date: Tue Dec  3 15:41:40 2013
  InstallationDate: Installed on 2010-10-21 (1139 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  SourcePackage: qemu
  UpgradeStatus: Upgraded to trusty on 2013-11-01 (31 days ago)

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