Subject: Re: Major KVM issues with kernel 4.5 on the host
To: Marc Haber <mh+linux-kernel@zugschlus.de>
References: <20160317165435.GB3022@torres.zugschlus.de>
 <20160317181128.GA30324@pd.tnic> <56EBD20A.1020608@redhat.com>
 <20160413183701.GC7600@torres.zugschlus.de> <570EADD2.8030300@redhat.com>
 <20160413222942.GD7600@torres.zugschlus.de>
Cc: Borislav Petkov <bp@alien8.de>, linux-kernel@vger.kernel.org,
        kvm ML <kvm@vger.kernel.org>
From: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <570EEF6D.40307@redhat.com>
Date: Thu, 14 Apr 2016 03:16:29 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101
 Thunderbird/38.7.1
MIME-Version: 1.0
In-Reply-To: <20160413222942.GD7600@torres.zugschlus.de>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 3065
Lines: 49


On 14/04/2016 00:29, Marc Haber wrote:
> On Wed, Apr 13, 2016 at 10:36:34PM +0200, Paolo Bonzini wrote:
>> Didn't help, but a fresh look at the list of 4.5 patches helped.
>> What the hell was I thinking, I missed write_rdtscp_aux who
>> obviously uses MSR_TSC_AUX.
> 
> I applied this patch to 4.5, which didn't go cleanly, I had to do it
> manually, and there is no change in behavior. Sometimes, the Vm just
> crashes, but most times the filesystem is remounted ro.

Ok, then I guess bisection is needed.  Please first try commit
45bdbcfdf241.  If it fails, then the bug come together with KVM's merge
window changes for 4.5-rc1.  Please apply the patch I sent here when
bisection is past 46896c73c1a4dde527c3a3cc43379deeb41985a1 (which means
that probably that should be the commit you try second; the bisection
then becomes much easier).

Thanks,

Paolo

> [   84.658968] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #7669: comm aide: deleted inode referenced: 27903
> [   84.664877] Aborting journal on device dm-0-8.
> [   84.667992] EXT4-fs (dm-0): Remounting filesystem read-only
> [   84.670972] EXT4-fs error (device dm-0): ext4_journal_check_start:56: Detected aborted journal
> [   84.763331] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #7669: comm aide: deleted inode referenced: 27898
> [   84.825412] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #7669: comm aide: deleted inode referenced: 27895
> [   84.907959] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #7669: comm aide: deleted inode referenced: 27893
> [   84.915187] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #7669: comm aide: deleted inode referenced: 27900
> [   84.961062] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #7669: comm aide: deleted inode referenced: 27889
> [   84.983700] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #7669: comm aide: deleted inode referenced: 27891
> [   98.315538] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #23567: comm aide: deleted inode referenced: 27897
> [   98.323606] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #23567: comm aide: deleted inode referenced: 27904
> [   99.889927] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #4650: comm aide: deleted inode referenced: 27892
> [   99.893823] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #4650: comm aide: deleted inode referenced: 27901
> [   99.901140] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #4650: comm aide: deleted inode referenced: 27890
> [   99.904898] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #4650: comm aide: deleted inode referenced: 27896
> [   99.909758] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #4650: comm aide: deleted inode referenced: 27899
> [   99.914394] EXT4-fs error (device dm-0): ext4_lookup:1602: inode #4650: comm aide: deleted inode referenced: 27894
> [  207.132045] serial8250: too much work for irq4
> [  207.220043] serial8250: too much work for irq4
> [  207.312028] serial8250: too much work for irq4
> 
> 
> Greetings
> Marc
>