[gentoo-user] qemu-kvm black screen and infinite loop on startup

[gentoo-user] qemu-kvm black screen and infinite loop on startup

[Kfir Lavi]

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Hi,
After updating qemu-kvm to 0.13.0-r2 I get an infinite loop when running
qemu.
You can spot the loop with strace.
This problem shows on Redhat
https://bugzilla.redhat.com/show_bug.cgi?id=553689#c5
and they say that it is related to the seabios.

Does anyone have this problem too?
I'm compiling qemu-kvm with hardend flag.

Regards,
Kfir

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Re: [gentoo-user] qemu-kvm black screen and infinite loop on startup

[Albert Hopkins]

On Tue, 2011-04-05 at 18:06 +0300, Kfir Lavi wrote:
> Hi,
> After updating qemu-kvm to 0.13.0-r2 I get an infinite loop when running
> qemu.
> You can spot the loop with strace.
> This problem shows on Redhat
> https://bugzilla.redhat.com/show_bug.cgi?id=553689#c5
> and they say that it is related to the seabios.
> 
> Does anyone have this problem too?
> I'm compiling qemu-kvm with hardend flag.

I've been using app-emulation/qemu-kvm-0.13.0-r2 since early March.  I
have not had that problem, but I do not use the hardened flag.

Re: [gentoo-user] qemu-kvm black screen and infinite loop on startup

[Kfir Lavi]

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On Wed, Apr 6, 2011 at 1:42 AM, Albert Hopkins <marduk@letterboxes.org>wrote:

> On Tue, 2011-04-05 at 18:06 +0300, Kfir Lavi wrote:
> > Hi,
> > After updating qemu-kvm to 0.13.0-r2 I get an infinite loop when running
> > qemu.
> > You can spot the loop with strace.
> > This problem shows on Redhat
> > https://bugzilla.redhat.com/show_bug.cgi?id=553689#c5
> > and they say that it is related to the seabios.
> >
> > Does anyone have this problem too?
> > I'm compiling qemu-kvm with hardend flag.
>
> I've been using app-emulation/qemu-kvm-0.13.0-r2 since early March.  I
> have not had that problem, but I do not use the hardened flag.
>
>
> Thanks for your replay,
I have tried to compile qemu without hardened, but it doesn't work:
USE="-alsa -aio -curl -jpeg -png -sdl -ssl -hardened" emerge -av
app-emulation/qemu-kvm

More inputs?

Tnx,
Kfir

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Re: [gentoo-user] qemu-kvm black screen and infinite loop on startup

[Kfir Lavi]

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On Wed, Apr 6, 2011 at 1:42 AM, Albert Hopkins <marduk@letterboxes.org>wrote:

> On Tue, 2011-04-05 at 18:06 +0300, Kfir Lavi wrote:
> > Hi,
> > After updating qemu-kvm to 0.13.0-r2 I get an infinite loop when running
> > qemu.
> > You can spot the loop with strace.
> > This problem shows on Redhat
> > https://bugzilla.redhat.com/show_bug.cgi?id=553689#c5
> > and they say that it is related to the seabios.
> >
> > Does anyone have this problem too?
> > I'm compiling qemu-kvm with hardend flag.
>
> I've been using app-emulation/qemu-kvm-0.13.0-r2 since early March.  I
> have not had that problem, but I do not use the hardened flag.
>
>
> Hi  Albert,
Can you paste your USE flags for qemu?

Thanks,
Kfir

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[gentoo-user] Re: qemu-kvm black screen and infinite loop on startup

[Kfir Lavi]

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On Tue, Apr 5, 2011 at 6:06 PM, Kfir Lavi <lavi.kfir@gmail.com> wrote:

> Hi,
> After updating qemu-kvm to 0.13.0-r2 I get an infinite loop when running
> qemu.
> You can spot the loop with strace.
> This problem shows on Redhat
> https://bugzilla.redhat.com/show_bug.cgi?id=553689#c5
> and they say that it is related to the seabios.
>
> Does anyone have this problem too?
> I'm compiling qemu-kvm with hardend flag.
>
> Regards,
> Kfir
>
when running 'strace qemu' I get this line:
read(11, 0xbf10ae5c, 128)               = -1 EAGAIN (Resource temporarily
unavailable)

This seems related to hardened.
paxctl shows for all qemu binaries:
- PaX flags: -----m-x-e-- [/usr/bin/qemu]
        MPROTECT is disabled
        RANDEXEC is disabled
        EMUTRAMP is disabled
- PaX flags: -----m-x-e-- [/usr/bin/qemu-i386]
        MPROTECT is disabled
        RANDEXEC is disabled
        EMUTRAMP is disabled
- PaX flags: -----m-x-e-- [/usr/bin/qemu-img]
        MPROTECT is disabled
        RANDEXEC is disabled
        EMUTRAMP is disabled
- PaX flags: -----m-x-e-- [/usr/bin/qemu-io]
        MPROTECT is disabled
        RANDEXEC is disabled
        EMUTRAMP is disabled
- PaX flags: -----m-x-e-- [/usr/bin/qemu-nbd]
        MPROTECT is disabled
        RANDEXEC is disabled
        EMUTRAMP is disabled

Does someone have the solution for this?

Regards,
Kfir

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Re: [gentoo-user] qemu-kvm black screen and infinite loop on startup

[Albert Hopkins]

On Wed, 2011-04-06 at 12:00 +0300, Kfir Lavi wrote:

>         
> Hi  Albert,
> Can you paste your USE flags for qemu?
> 
> Thanks,
> Kfir

USE="aio sdl vde -alsa -bluetooth -brltty -curl -esd -fdt -hardened
-jpeg -ncurses -png -pulseaudio -qemu-ifup -sasl -ssl -static"

[gentoo-user] Re: qemu-kvm black screen and infinite loop on startup

[Kfir Lavi]

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On Tue, Apr 5, 2011 at 6:06 PM, Kfir Lavi <lavi.kfir@gmail.com> wrote:

> Hi,
> After updating qemu-kvm to 0.13.0-r2 I get an infinite loop when running
> qemu.
> You can spot the loop with strace.
> This problem shows on Redhat
> https://bugzilla.redhat.com/show_bug.cgi?id=553689#c5
> and they say that it is related to the seabios.
>
> Does anyone have this problem too?
> I'm compiling qemu-kvm with hardend flag.
>
> Regards,
> Kfir
>

When I run qemu -no-kvm things work as expected under hardened kernel.
Using regular kernel (none hardened) qemu works ok.
So, the problem is running qemu under hardened kernel.

If someone have some input, I'll be happy to hear it.

Regards,
Kfir

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Re: [gentoo-user] Re: qemu-kvm black screen and infinite loop on startup

[Gregory Fontenele]

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want to leave this list but I can not, can someone erase me from this list?

On Wed, Apr 6, 2011 at 08:45, Kfir Lavi <lavi.kfir@gmail.com> wrote:

>
>
> On Tue, Apr 5, 2011 at 6:06 PM, Kfir Lavi <lavi.kfir@gmail.com> wrote:
>
>> Hi,
>> After updating qemu-kvm to 0.13.0-r2 I get an infinite loop when running
>> qemu.
>> You can spot the loop with strace.
>> This problem shows on Redhat
>> https://bugzilla.redhat.com/show_bug.cgi?id=553689#c5
>> and they say that it is related to the seabios.
>>
>> Does anyone have this problem too?
>> I'm compiling qemu-kvm with hardend flag.
>>
>> Regards,
>> Kfir
>>
>
> When I run qemu -no-kvm things work as expected under hardened kernel.
> Using regular kernel (none hardened) qemu works ok.
> So, the problem is running qemu under hardened kernel.
>
> If someone have some input, I'll be happy to hear it.
>
> Regards,
> Kfir
>



-- 
Atenciosamente,
Gregory Fontenele

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Re: [gentoo-user] Re: qemu-kvm black screen and infinite loop on startup

[Michael Orlitzky]

On 04/06/2011 07:45 AM, Kfir Lavi wrote:
> 
> When I run qemu -no-kvm things work as expected under hardened kernel.
> Using regular kernel (none hardened) qemu works ok.
> So, the problem is running qemu under hardened kernel.
> 
> If someone have some input, I'll be happy to hear it.
> 

I am a long-time user of qemu/kvm under hardened. It works off and on.

I don't have any scientific advice for you, only this: if you ever find
a combination of kernel/qemu that works, *don't change anything*.

Re: [gentoo-user] Re: qemu-kvm black screen and infinite loop on startup

[Kfir Lavi]

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On Thu, Apr 7, 2011 at 1:19 AM, Michael Orlitzky <michael@orlitzky.com>wrote:

> On 04/06/2011 07:45 AM, Kfir Lavi wrote:
> >
> > When I run qemu -no-kvm things work as expected under hardened kernel.
> > Using regular kernel (none hardened) qemu works ok.
> > So, the problem is running qemu under hardened kernel.
> >
> > If someone have some input, I'll be happy to hear it.
> >
>
> I am a long-time user of qemu/kvm under hardened. It works off and on.
>
> I don't have any scientific advice for you, only this: if you ever find
> a combination of kernel/qemu that works, *don't change anything*.
>
> Well, thanks for this advice. hehe
I booted a none hardened kernel, and qemu started to work again.
So yes, the hardened kernel is to blame.
I wonder why qemu have problem with hardened kernel?
Maybe some of the hardened devs can pitch in....

Regards,
Kfir

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