I just made the huge mistake of hibernating and resuming, I'm going trough
the process of rescue and all, thankfully I had a 2016 cd in the drive.
I'll read up once the sheer panic settles.
-Michael
On Wed, Jan 26, 2022, 21:22 John Paul Adrian Glaubitz <
glaub...@physik.fu-berlin.de> wrote:
> Hi
Hi Michael!
On 1/13/22 01:17, John Paul Adrian Glaubitz wrote:
> On 1/9/22 23:17, John Paul Adrian Glaubitz wrote:
>> On 1/7/22 12:20, John Paul Adrian Glaubitz wrote:
Can you separately test with (on the host):
# echo 0 > /sys/module/kvm_hv/parameters/dynamic_mt_modes
>>>
>>> I'm
Hi Michael!
On 1/9/22 23:17, John Paul Adrian Glaubitz wrote:
> On 1/7/22 12:20, John Paul Adrian Glaubitz wrote:
>>> Can you separately test with (on the host):
>>>
>>> # echo 0 > /sys/module/kvm_hv/parameters/dynamic_mt_modes
>>
>> I'm trying to turn off "dynamic_mt_modes" first and see if that
Hi Michael!
On 1/7/22 12:20, John Paul Adrian Glaubitz wrote:
>> Can you separately test with (on the host):
>>
>> # echo 0 > /sys/module/kvm_hv/parameters/dynamic_mt_modes
>
> I'm trying to turn off "dynamic_mt_modes" first and see if that makes any
> difference.
>
> I will report back.
So f
Hi Michael!
On 1/6/22 11:58, Michael Ellerman wrote:
>> We're currently running 5.15.x on the host system and the guests and the
>> testsuite
>> for gcc-9 still reproducibly kills the KVM host.
>
> Have you been able to try the different -smp options I suggested?
>
> Can you separately test wit
John Paul Adrian Glaubitz writes:
> Hi Michael!
>
> Sorry for the long time without any responses. Shall we continue debugging
> this?
Yes!
Sorry also that I haven't been able to fix it yet, I had to stop chasing
this bug and work on other things before the end of the year.
> We're currently r
On Fri, Oct 29, 2021 at 02:33:12PM +0200, John Paul Adrian Glaubitz wrote:
> Hi Nicholas!
>
> On 10/29/21 02:41, Nicholas Piggin wrote:
> > Soft lockup should mean it's taking timer interrupts still, just not
> > scheduling. Do you have the hard lockup detector enabled as well? Is
> > there anyth
Hello,
On Thu, Oct 28, 2021 at 04:15:19PM +0200, John Paul Adrian Glaubitz wrote:
> Hi!
>
> On 10/28/21 16:05, John Paul Adrian Glaubitz wrote:
> > The following packages were being built at the same time:
> >
> > - guest 1: virtuoso-opensource and openturns
> > - guest 2: llvm-toolchain-13
> >
Hi Michael!
On 11/1/21 08:37, John Paul Adrian Glaubitz wrote:
> I made another experiment and upgraded the host to 5.15-rc7 which contains
> your
> fixes and made the guests build gcc-10. Interestingly, this time, the gcc-10
> build crashed the guest but didn't manage to crash the host. I will u
Hi Michael!
On 11/1/21 07:53, Michael Ellerman wrote:
> Sure, will give that a try.
>
> I was able to crash my machine over the weekend, building openjdk, but I
> haven't been able to reproduce it for ~24 hours now (I didn't change
> anything).
I made another experiment and upgraded the host to
John Paul Adrian Glaubitz writes:
> Hi Michael!
>
> On 10/28/21 08:39, Michael Ellerman wrote:
>> That completed fine on my BE VM here.
>>
>> I ran these in two tmux windows:
>> $ sbuild -d sid --arch=powerpc --no-arch-all gcc-11_11.2.0-10.dsc
>> $ sbuild -d sid --arch=ppc64 --no-arch-all gcc
Hi Michael!
On 10/28/21 08:39, Michael Ellerman wrote:
> That completed fine on my BE VM here.
>
> I ran these in two tmux windows:
> $ sbuild -d sid --arch=powerpc --no-arch-all gcc-11_11.2.0-10.dsc
> $ sbuild -d sid --arch=ppc64 --no-arch-all gcc-11_11.2.0-10.dsc
Could you try gcc-10 inste
Hi Nicholas!
On 10/29/21 02:41, Nicholas Piggin wrote:
> Soft lockup should mean it's taking timer interrupts still, just not
> scheduling. Do you have the hard lockup detector enabled as well? Is
> there anything stuck spinning on another CPU?
I haven't enabled it. But looking at the documentat
Excerpts from John Paul Adrian Glaubitz's message of October 29, 2021 12:05 am:
> Hi Michael!
>
> On 10/28/21 13:20, John Paul Adrian Glaubitz wrote:
>> It seems I also can no longer reproduce the issue, even when building the
>> most problematic
>> packages and I think we should consider it fixe
Hi!
On 10/28/21 16:05, John Paul Adrian Glaubitz wrote:
> The following packages were being built at the same time:
>
> - guest 1: virtuoso-opensource and openturns
> - guest 2: llvm-toolchain-13
>
> I really did a lot of testing today with no issues and just after I sent my
> report
> to oss-s
Hi Michael!
On 10/28/21 13:20, John Paul Adrian Glaubitz wrote:
> It seems I also can no longer reproduce the issue, even when building the
> most problematic
> packages and I think we should consider it fixed for now. I will keep
> monitoring the server,
> of course, and will let you know in ca
Hello!
On 10/28/21 15:52, John Paul Adrian Glaubitz wrote:
> I am not sure what triggered my previous crash but I don't think it's related
> to this
> particular bug. I will keep monitoring the server in any case and open a new
> bug report
> in case I'm running into similar issues.
This is ver
Hello!
An update to this post with oss-security CC'ed.
On 10/26/21 10:48, John Paul Adrian Glaubitz wrote:
> I have tested these patches against 5.14 but it seems the problem [1] still
> remains for me
> for big-endian guests. I built a patched kernel yesterday, rebooted the KVM
> server and le
Hi Michael!
On 10/28/21 08:39, Michael Ellerman wrote:
>>> No, I will try that now.
>
> That completed fine on my BE VM here.
>
> I ran these in two tmux windows:
> $ sbuild -d sid --arch=powerpc --no-arch-all gcc-11_11.2.0-10.dsc
> $ sbuild -d sid --arch=ppc64 --no-arch-all gcc-11_11.2.0-10
[ Dropping oss-security from Cc]
John Paul Adrian Glaubitz writes:
> On 10/27/21 13:06, Michael Ellerman wrote:
>> John Paul Adrian Glaubitz writes:
>>> On 10/27/21 07:30, Michael Ellerman wrote:
I did test the repro case you gave me before (in the bugzilla), which
was building glibc,
Hi Michael!
On 10/27/21 13:06, Michael Ellerman wrote:
> John Paul Adrian Glaubitz writes:
>> Hi Michael!
>>
>> On 10/27/21 07:30, Michael Ellerman wrote:
>>> I did test the repro case you gave me before (in the bugzilla), which
>>> was building glibc, that passes for me with a patched host.
>>
>
John Paul Adrian Glaubitz writes:
> Hi Michael!
>
> On 10/27/21 07:30, Michael Ellerman wrote:
>> I did test the repro case you gave me before (in the bugzilla), which
>> was building glibc, that passes for me with a patched host.
>
> Did you manage to crash the unpatched host?
Yes, the parallel
Hi Michael!
On 10/27/21 07:30, Michael Ellerman wrote:
> I did test the repro case you gave me before (in the bugzilla), which
> was building glibc, that passes for me with a patched host.
Did you manage to crash the unpatched host? If the unpatched host crashes
for you but the patched doesn't, I
John Paul Adrian Glaubitz writes:
> Hi Michael!
Hi Adrian,
Thanks for testing ...
>> The Linux kernel for powerpc since v5.2 has a bug which allows a
>> malicious KVM guest to crash the host, when the host is running on
>> Power8.
>>
>> Only machines using Linux as the hypervisor, aka. KVM, po
Excerpts from John Paul Adrian Glaubitz's message of October 26, 2021 6:48 pm:
> Hi Michael!
>
>> The Linux kernel for powerpc since v5.2 has a bug which allows a
>> malicious KVM guest to crash the host, when the host is running on
>> Power8.
>>
>> Only machines using Linux as the hypervisor, ak
Hi Michael!
> The Linux kernel for powerpc since v5.2 has a bug which allows a
> malicious KVM guest to crash the host, when the host is running on
> Power8.
>
> Only machines using Linux as the hypervisor, aka. KVM, powernv or bare
> metal, are affected by the bug. Machines running PowerVM are n
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