[Bug 205655] New: kvm with cache=none and btrfs -> corrupted file system

[Bug 205655] New: kvm with cache=none and btrfs -> corrupted file system

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205655

            Bug ID: 205655
           Summary: kvm with cache=none and btrfs -> corrupted file system
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.9   4.19    5.3.12
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: denis.ovsyannikov@gmail.com
        Regression: No

hello
we use kvm with disks formatted in btrfs
when we turned on the mode "cache=none"
got data corruption
other modes work well

we tested it on three servers and the result is always repeated
we tested on three operating systems(debian 9, debian 10, manjaro with kernel
5.3.12)

fstab
UUID=a49494f2-35a4-4a9c-aab0-1afc905c02c2 /mnt/test      btrfs   defaults 0 2

dmesg
[675174.887900] BTRFS error (device sde1): bdev /dev/sde1 errs: wr 0, rd 0,
flush 0, corrupt 2137, gen 0

[102857.086874] BTRFS warning (device sdc1): csum failed root 256 ino 260 off
1735843840 csum 0xf69f8dd2 expected csum 0x96e71981 mirror 1

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[Bug 205655] kvm with cache=none and btrfs -> corrupted file system

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205655

--- Comment #1 from denis.ovsyannikov@gmail.com ---
I made a mistake, directsync mode also corrupts data

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Re: [Bug 205655] New: kvm with cache=none and btrfs -> corrupted file system

[Stefan Hajnoczi]

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On Tue, Nov 26, 2019 at 09:24:48AM +0000, bugzilla-daemon@bugzilla.kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=205655
> 
>             Bug ID: 205655
>            Summary: kvm with cache=none and btrfs -> corrupted file system
>            Product: Virtualization
>            Version: unspecified
>     Kernel Version: 4.9   4.19    5.3.12
>           Hardware: x86-64
>                 OS: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: high
>           Priority: P1
>          Component: kvm
>           Assignee: virtualization_kvm@kernel-bugs.osdl.org
>           Reporter: denis.ovsyannikov@gmail.com
>         Regression: No
> 
> hello
> we use kvm with disks formatted in btrfs
> when we turned on the mode "cache=none"
> got data corruption
> other modes work well
> 
> we tested it on three servers and the result is always repeated
> we tested on three operating systems(debian 9, debian 10, manjaro with kernel
> 5.3.12)
> 
> fstab
> UUID=a49494f2-35a4-4a9c-aab0-1afc905c02c2 /mnt/test      btrfs   defaults 0 2
> 
> dmesg
> [675174.887900] BTRFS error (device sde1): bdev /dev/sde1 errs: wr 0, rd 0,
> flush 0, corrupt 2137, gen 0
> 
> [102857.086874] BTRFS warning (device sdc1): csum failed root 256 ino 260 off
> 1735843840 csum 0xf69f8dd2 expected csum 0x96e71981 mirror 1

Please post your QEMU command-line.

What is the storage configuration on the host?  Which host file system
are you using?  Which image file format?

What test is being run inside the guest?

Is this a regression?  Which host and guest kernel versions worked fine
before?

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[Bug 205655] kvm with cache=none and btrfs -> corrupted file system

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=205655

--- Comment #2 from Stefan Hajnoczi (stefanha@gmail.com) ---
On Tue, Nov 26, 2019 at 09:24:48AM +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=205655
> 
>             Bug ID: 205655
>            Summary: kvm with cache=none and btrfs -> corrupted file system
>            Product: Virtualization
>            Version: unspecified
>     Kernel Version: 4.9   4.19    5.3.12
>           Hardware: x86-64
>                 OS: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: high
>           Priority: P1
>          Component: kvm
>           Assignee: virtualization_kvm@kernel-bugs.osdl.org
>           Reporter: denis.ovsyannikov@gmail.com
>         Regression: No
> 
> hello
> we use kvm with disks formatted in btrfs
> when we turned on the mode "cache=none"
> got data corruption
> other modes work well
> 
> we tested it on three servers and the result is always repeated
> we tested on three operating systems(debian 9, debian 10, manjaro with kernel
> 5.3.12)
> 
> fstab
> UUID=a49494f2-35a4-4a9c-aab0-1afc905c02c2 /mnt/test      btrfs   defaults 0 2
> 
> dmesg
> [675174.887900] BTRFS error (device sde1): bdev /dev/sde1 errs: wr 0, rd 0,
> flush 0, corrupt 2137, gen 0
> 
> [102857.086874] BTRFS warning (device sdc1): csum failed root 256 ino 260 off
> 1735843840 csum 0xf69f8dd2 expected csum 0x96e71981 mirror 1

Please post your QEMU command-line.

What is the storage configuration on the host?  Which host file system
are you using?  Which image file format?

What test is being run inside the guest?

Is this a regression?  Which host and guest kernel versions worked fine
before?

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