[REGRESSION] 2.6.32.36 - Linux Xen DomU doesn't boot anymore

[REGRESSION] 2.6.32.36 - Linux Xen DomU doesn't boot anymore

[guilherme m. schroeder]

Hi,

Linux Kernel 2.6.32.36 introduced a regression that prevents Linux Xen
DomU from booting.
Linux DomU starts and after a while it shutdown without log messages.

I bisected a vanilla kernel from 2.6.32.36 (bad) to 2.6.32.32 (good)
and got this commit:

vm:~/linux-2.6.32.y# git bisect bad
856460aa905dcc6d11a05a832d487a7b0ce69402 is the first bad commit
commit 856460aa905dcc6d11a05a832d487a7b0ce69402
Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Date:   Fri Feb 18 11:32:40 2011 +0000

    xen: set max_pfn_mapped to the last pfn mapped

    commit 14988a4d350ce3b41ecad4f63c4f44c56f5ae34d upstream.

    Do not set max_pfn_mapped to the end of the initial memory mappings,
    that also contain pages that don't belong in pfn space (like the mfn
    list).

    Set max_pfn_mapped to the last real pfn mapped in the initial memory
    mappings that is the pfn backing _end.

    Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
    Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    LKML-Reference: <alpine.DEB.2.00.1103171739050.3382@kaball-desktop>
    Signed-off-by: H. Peter Anvin <hpa@zytor.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

:040000 040000 a679f50b64c290b9a51e3dba8d3d648bca50fdf0
e7b018c4e0015aae44ed6f9f6323d8b13d032b86 M	arch

I have tested against XCP 1.0, Citrix XenServer 5.6 and 5.6 FP1.
Without this patch, Linux DomU boots and runs fine.
If more info is needed, please let me know.

Re: [REGRESSION] 2.6.32.36 - Linux Xen DomU doesn't boot anymore

[Stratos Psomadakis]

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On 04/14/2011 11:35 PM, guilherme m. schroeder wrote:
> Hi,
>
> Linux Kernel 2.6.32.36 introduced a regression that prevents Linux Xen
> DomU from booting.
> Linux DomU starts and after a while it shutdown without log messages.
>
> I bisected a vanilla kernel from 2.6.32.36 (bad) to 2.6.32.32 (good)
> and got this commit:
>
> vm:~/linux-2.6.32.y# git bisect bad
> 856460aa905dcc6d11a05a832d487a7b0ce69402 is the first bad commit
> commit 856460aa905dcc6d11a05a832d487a7b0ce69402
> Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> Date:   Fri Feb 18 11:32:40 2011 +0000
>
>     xen: set max_pfn_mapped to the last pfn mapped
>
>     commit 14988a4d350ce3b41ecad4f63c4f44c56f5ae34d upstream.
>
>     Do not set max_pfn_mapped to the end of the initial memory mappings,
>     that also contain pages that don't belong in pfn space (like the mfn
>     list).
>
>     Set max_pfn_mapped to the last real pfn mapped in the initial memory
>     mappings that is the pfn backing _end.
>
>     Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
>     Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
>     LKML-Reference: <alpine.DEB.2.00.1103171739050.3382@kaball-desktop>
>     Signed-off-by: H. Peter Anvin <hpa@zytor.com>
>     Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
>
> :040000 040000 a679f50b64c290b9a51e3dba8d3d648bca50fdf0
> e7b018c4e0015aae44ed6f9f6323d8b13d032b86 M	arch
>
> I have tested against XCP 1.0, Citrix XenServer 5.6 and 5.6 FP1.
> Without this patch, Linux DomU boots and runs fine.
> If more info is needed, please let me know.
> --
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> Please read the FAQ at  http://www.tux.org/lkml/
Can you try 2.6.32.37-rc1?
The patch you're referring to was committed I think along with another
patch which caused some trouble in the -stable trees(I'm not surea bout
that though :/).
And in 2.6.32.37-rc1 it was reverted:
[59/74] [PATCH] Revert "x86: Cleanup highmap after brk is concluded"
Maybe it fixes your problem.

-- 
Stratos Psomadakis
<psomas@ece.ntua.gr>



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Re: [REGRESSION] 2.6.32.36 - Linux Xen DomU doesn't boot anymore

[guilherme m. schroeder]

On Thu, Apr 14, 2011 at 5:52 PM, Stratos Psomadakis <psomas@ece.ntua.gr> wrote:
> Can you try 2.6.32.37-rc1?
> The patch you're referring to was committed I think along with another
> patch which caused some trouble in the -stable trees(I'm not surea bout
> that though :/).
> And in 2.6.32.37-rc1 it was reverted:
> [59/74] [PATCH] Revert "x86: Cleanup highmap after brk is concluded"
> Maybe it fixes your problem.
>
> --
> Stratos Psomadakis
> <psomas@ece.ntua.gr>

No problem with 2.6.32.37-rc1.
Do I need to bisect 2.6.32.37-rc1 against 2.6.32.36 to make sure it is
the patch that you mentioned?
And if we find it, there'll be a 2.6.32.36.1 release or we need to
wait for 2.6.32.37?
I'm asking this because some distros are already taking 2.6.32.36
(Debian 6.0 proposed kernel for example).

Re: [REGRESSION] 2.6.32.36 - Linux Xen DomU doesn't boot anymore

[guilherme m. schroeder]

2.6.32.37 fixed the regression.

Thanks.