[Qemu-discuss] virsh console crash

[Andrei Perietanu]

I just came across a problem I can't make heads or tails of: I have a host with libvirt 2.3.0 and qemu 2.6.0 installed

I create a Guest (linux machine) nothing fancy so far (I don't think guest configuration is relevant)

I connect to the host either via a serial cable (using something like minicom) or SSH.

After connecting to the Host I connect to the guest via console (virsh console guest_name) and generate a large amount of output (100kb of output should do it) 

If I'm connected via serial to the host, the console simply crashes half way through the prints:

 error: Disconnected from qemu:///system due to I/O error

At this point the prompt shows the host console since virsh console crashed

If I do the same thing while connected via ssh to the host everything works fine.

Checking the guest log file I notice this:

Domain id=1 is tainted: high-privileges

qemu: thread naming not supported on this host

char device redirected to /dev/pts/0 (label charserial0)

qemu_madvise: Invalid argument

madvise doesn't support MADV_DONTDUMP, but dump_guest_core=off specified

qemu_madvise: Invalid argument

madvise doesn't support MADV_DONTDUMP, but dump_guest_core=off specified

qemu_madvise: Invalid argument

madvise doesn't support MADV_DONTDUMP, but dump_guest_core=off specified

qemu_madvise: Invalid argument

madvise doesn't support MADV_DONTDUMP, but dump_guest_core=off specified

qemu_madvise: Invalid argument

madvise doesn't support MADV_DONTDUMP, but dump_guest_core=off specified

I tried enabling some options in the host kernel (after googling the matter for a while) but to change.

Any ideas about what could be wrong here?

Thanks!

Andrei

The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you receive this in error please contact the sender and delete the material from any computer immediately. It is the policy of Klas  Limited to disavow the sending of offensive material and should you consider that the material contained in the message is offensive you should contact the sender immediately and also your I.T. Manager.

Klas Telecom Inc., a Virginia Corporation with offices at 1101 30th St. NW, Washington, DC 20007.

Klas Limited (Company Number 163303) trading as Klas Telecom, an Irish Limited Liability Company, with its registered office at Fourth Floor, One Kilmainham Square, Inchicore Road, Kilmainham, Dublin 8, Ireland.