Re: [Qemu-devel] Qemu shutdown VMs with the error in transmitting console data

[Naruto Nguyen]

Hi again,

Could be there any workaround to avoid VM  shutdown?

Thanks,
Brs,
Bao
On Sun, 16 Sep 2018 at 16:01, Naruto Nguyen <address@hidden> wrote:
>
> Hello everyone,
>
> Recently when I reboot my guest installed kernel 4.4.114, qemu-kvm
> throws the error
>
> qemu-kvm: hw/char/serial.c:232: serial_xmit: Assertion `!(s->lsr &
> 0x40)' failed.
> shutting down
>
> then qemu-kvm powers off the VM, I can meet the issue after a lot of
> time to reboot the VM. The issue looks like to be reproduced more
> easily by increasing the loglevel to make kernel throws more log to
> the console. It seems I did not meet the issue with guest installed
> kernel 3.0. There is another thread of Redhat about this bug but looks
> like they cannot reproduce the issue and just provide the potential
> fix https://bugzilla.redhat.com/show_bug.cgi?id=1481701.
>
> I used the same qemu version with Redhat thread, qemu 2.6
> qemu-kvm-rhev-2.6.0-28.el7_3.9.x86_64. My guest xml setup is to
> redirect the console to file. I used the same config between guest
> kernel 3.0 and 4.4. Could you please help me to understand more about
> this issue:
>
> - In what conditions can make qemu-kvm trigger this issue like: guest
> console hangs or guest output to console too much?
> - Why I just see the issue on guest installed kernel 4.4, not on kernel 3.0?
>
> Thanks a lot,
> Brs,
> Naruto