DebuggingKVM

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= Bug importance =

 * critical: eats your data
 * high: crashes the host
 * medium: crashes the guest (and most other "normal" bugs)
 * low: doesn't crash host or guest, but has undesirable, clearly buggy behavior, or if it does cause crashes, can be worked around
 * wishlist: feature requests, everything else lower priority
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 * If it is easily reproducible, try building from upstream git and reproducing. Then bisect
   * [ todo - give example ]
 * Try a newer kernel if available
 * If KSM is enabled, see whether disabling it helps
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 * If your linux guest can't boot, start kvm with {{{ -serial file:kvm_guset_debug.log }}}.
   {{{ kvm linux_guest.img -serial file:kvm_guset_debug.log 		 * If your linux guest can't boot, start kvm with {{{ -serial file:kvm_guest_debug.log }}}.
   {{{
 kvm linux_guest.img -serial file:kvm_guset_debug.log
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   {{{ kernel /vmlinuz root=/dev/sda1 earlycon=ttyS0 console=ttyS0    {{{
 kernel /vmlinuz root=/dev/sda1 earlycon=ttyS0 console=ttyS0

Debugging Central

This page is part of the debugging series — pages with debugging details for a variety of Ubuntu packages.

Bug importance

  • critical: eats your data
  • high: crashes the host
  • medium: crashes the guest (and most other "normal" bugs)
  • low: doesn't crash host or guest, but has undesirable, clearly buggy behavior, or if it does cause crashes, can be worked around
  • wishlist: feature requests, everything else lower priority

Debugging procedure

  • If it is easily reproducible, try building from upstream git and reproducing. Then bisect
    • [ todo - give example ]
  • Try a newer kernel if available
  • If KSM is enabled, see whether disabling it helps

Reporting a bug

All reports should contain the following information. Please be sure to attach these files to the bug report.

  • uname -a > uname-a.log

  • cat /proc/version_signature > proc_version_signature.log

  • dmesg > dmesg.log

  • cat /proc/cpuinfo > proc_cpuinfo.log

  • If your linux guest can't boot, start kvm with  -serial file:kvm_guest_debug.log . 

    •  kvm linux_guest.img -serial file:kvm_guset_debug.log

      And edit grub to boot kernel with  earlycon=ttyS0 console=ttyS0  

       kernel /vmlinuz root=/dev/sda1 earlycon=ttyS0 console=ttyS0

CategoryServerTeam CategoryBugSquad CategoryDebugging

DebuggingKVM (last edited 2015-06-18 16:22:08 by serge-hallyn)