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Re: [Qemu-devel] kvm segfaulting
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] kvm segfaulting |
Date: |
Wed, 13 Feb 2013 14:39:08 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 |
Il 13/02/2013 13:55, Stefan Priebe - Profihost AG ha scritto:
> Hi,
> Am 13.02.2013 12:36, schrieb Paolo Bonzini:
>> Il 13/02/2013 10:07, Stefan Priebe - Profihost AG ha scritto:
>>>>>>>
>>>>>>> commit 47a150a4bbb06e45ef439a8222e9f46a7c4cca3f
>>> ...
>>>>> You can certainly try reverting it, but this patch is fixing a real bug.
>>> Will try that. Yes but even if it fixes a bug and raises another one
>>> (kvm segfault) which is the worst one. It should be fixed.
>>
>> The KVM segfault is exposing a potential consistency problem. What is
>> worse is not obvious. Also, it is happening at reset time if this is
>> the culprit. Reset usually happens at places where no data loss is caused.
>>
>> Can you find out what the VM was doing when it segfaulted? (Or even,
>> can you place the corefile and kvm executable somewhere where I can
>> download it?)
>
> Yes it was doing an fstrim -v / which resulted in:
>
> [45648.453698] end_request: I/O error, dev sda, sector 9066952
Ok, very helpful. One thing is to find why this failed. This can
come later though.
First of all, please run "cat /sys/block/*/device/scsi_disk/*/provisioning_mode"
in a VM with a similar configuration as the one that crashed last.
Second, I attach another patch.
Third, if possible please compile QEMU with --enable-trace-backend=simple,
and run it with
-trace events='bdrv_aio_discard
scsi_req_cancel
',file=qemu.$$.trace
This can give some clues. The files should remain quite small,
so you can enable it on all VMs safely.
> Sadly not as i don't have acore dump. The kvm processes are started
> through variuos Daemons and there seems no way to activate core dumps
> for an already running process and i don't know which VM will crash next.
Probably the next that invokes fstrim. :)
>> If not, do your VMs reset themselves
>> often for example?
> No
Ok, good to know.
>> Can you reproduce it on non-rbd storage?
> I don't have another storage type. ;-(
No problem.
Paolo
unmap.patch
Description: Text Data
- Re: [Qemu-devel] kvm segfaulting, (continued)
- Re: [Qemu-devel] kvm segfaulting, Paolo Bonzini, 2013/02/11
- Re: [Qemu-devel] kvm segfaulting, Stefan Priebe - Profihost AG, 2013/02/12
- Re: [Qemu-devel] kvm segfaulting, Paolo Bonzini, 2013/02/12
- Re: [Qemu-devel] kvm segfaulting, Stefan Priebe - Profihost AG, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting, Stefan Priebe - Profihost AG, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting, Stefan Priebe - Profihost AG, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting, Paolo Bonzini, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting, Stefan Priebe - Profihost AG, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting, Paolo Bonzini, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting, Stefan Priebe - Profihost AG, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting,
Paolo Bonzini <=
- Re: [Qemu-devel] kvm segfaulting, Stefan Priebe - Profihost AG, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting, Stefan Priebe - Profihost AG, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting, Stefan Priebe - Profihost AG, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting, Paolo Bonzini, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting, Stefan Priebe, 2013/02/13
- Re: [Qemu-devel] kvm segfaulting, Stefan Priebe - Profihost AG, 2013/02/14
Re: [Qemu-devel] kvm segfaulting, Stefan Priebe - Profihost AG, 2013/02/11