Re: Major KVM issues with kernel 4.5 on the host

Paolo Bonzini
2016-04-14T01:16:29Z

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
>