Cannot start NetVM

[marmarek]

Reported by joanna on 15 Aug 2011 09:22 UTC
Sometimes qvm-start netvm hangs, and the following is in the logs:

[~](joanna@dom0)$ cat /var/log/xen/xl-netvm.log
Waiting for domain netvm (domid 14) to die [13139](pid)
Domain 14 is dead
Action for shutdown reason code 3 is destroy
Domain 14 needs to be cleaned up: destroying the domain
libxl: error: libxl_device.c:513:libxl__wait_for_backend Backend /local/domain/0/backend/pci/14/0 not ready
libxl: error: libxl_device.c:513:libxl__wait_for_backend Backend /local/domain/0/backend/pci/14/0 not ready
Done. Exiting now

```}

Migrated-From: https://wiki.qubes-os.org/ticket/324

[marmarek]

Comment by rafal on 15 Aug 2011 19:21 UTC
In order to capture dmesg for the crashed domain kernel, please do:

1. in /usr/share/qubes/vm-template.conf, change "on crash=destroy" to "on_crash=preserve"
2. in qubes.py, comment out self.force_shutdown() after failed qrexec_daemon start (around line 974)

then reproduce the crash, connect to the crashed domain via xl console. Collect the logs; then cleanup via xl destroy.

[marmarek]

Comment by rafal on 15 Aug 2011 19:21 UTC
In order to capture dmesg for the crashed domain kernel, please do:

1. in /usr/share/qubes/vm-template.conf, change "on crash=destroy" to "on_crash=preserve"
2. in qubes.py, comment out self.force_shutdown() after failed qrexec_daemon start (around line 974)

then reproduce the crash, connect to the crashed domain via xl console. Collect the logs; then cleanup via xl destroy.

[marmarek]

Comment by marmarek on 31 Aug 2011 12:36 UTC
How long have you waited and after which message qvm-start hanged?

If dom0 had network connected (via qvm-dom0-network-via-netvm) and netvm was halted, dom0 left with ghost eth0. This causes long DNS timeouts (ex sudo tries to determinate hostname).

[marmarek]

Comment by marmarek on 31 Aug 2011 12:36 UTC
How long have you waited and after which message qvm-start hanged?

If dom0 had network connected (via qvm-dom0-network-via-netvm) and netvm was halted, dom0 left with ghost eth0. This causes long DNS timeouts (ex sudo tries to determinate hostname).

[marmarek]

Comment by joanna on 1 Sep 2011 08:35 UTC
I think this is a dup of #336.

[marmarek]

Comment by joanna on 1 Sep 2011 08:35 UTC
I think this is a dup of #336.