problems with btrfs filesystem loading

problems with btrfs filesystem loading

[Michał Zegan]

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Hello.

I have odroid c2, processor architecture aarch64, linux kernel from
master as of today from http://github.com/torwalds/linux.git.
It seems that the btrfs module cannot be loaded. The only thing that
happens is that after modprobe i see:
modprobe: can't load module btrfs (kernel/fs/btrfs/btrfs.ko.gz): unknown
symbol in module, or unknown parameter
No errors in dmesg, like I have ignore_loglevel in kernel cmdline and no
logs in console appear except logs for loading dependencies like xor
module, but that is probably not important.
The kernel has been recompiled few minutes ago from scratch, the only
thing left was .config file. What is that? other modules load correctly
from what I can see.


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Fwd: problems with btrfs filesystem loading

[Michał Zegan]

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Resending to btrfs list



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To: linux-fsdevel@vger.kernel.org
From: Michał Zegan <webczat_200@poczta.onet.pl>
Subject: problems with btrfs filesystem loading
Message-ID: <05893a24-2bf7-d485-1f9c-b10650419955@poczta.onet.pl>
Date: Thu, 29 Dec 2016 16:24:47 +0100
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Hello.

I have odroid c2, processor architecture aarch64, linux kernel from
master as of today from http://github.com/torwalds/linux.git.
It seems that the btrfs module cannot be loaded. The only thing that
happens is that after modprobe i see:
modprobe: can't load module btrfs (kernel/fs/btrfs/btrfs.ko.gz): unknown
symbol in module, or unknown parameter
No errors in dmesg, like I have ignore_loglevel in kernel cmdline and no
logs in console appear except logs for loading dependencies like xor
module, but that is probably not important.
The kernel has been recompiled few minutes ago from scratch, the only
thing left was .config file. What is that? other modules load correctly
from what I can see.




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Re: problems with btrfs filesystem loading

[Roman Mamedov]

On Thu, 29 Dec 2016 16:42:09 +0100
Michał Zegan <webczat_200@poczta.onet.pl> wrote:

> I have odroid c2, processor architecture aarch64, linux kernel from
> master as of today from http://github.com/torwalds/linux.git.
> It seems that the btrfs module cannot be loaded. The only thing that
> happens is that after modprobe i see:
> modprobe: can't load module btrfs (kernel/fs/btrfs/btrfs.ko.gz): unknown
> symbol in module, or unknown parameter
> No errors in dmesg, like I have ignore_loglevel in kernel cmdline and no
> logs in console appear except logs for loading dependencies like xor
> module, but that is probably not important.
> The kernel has been recompiled few minutes ago from scratch, the only
> thing left was .config file. What is that? other modules load correctly
> from what I can see.

In the past there's been some trouble with crc32 dependencies:
https://www.spinics.net/lists/linux-btrfs/msg32104.html
Not sure if that's relevant anymore, but in any case, check if you have
crc32-related stuff either built-in or compiled as modules, if latter, try
loading those before btrfs (/lib/modules/*/kernel/crypto/crc32*)

-- 
With respect,
Roman

Re: problems with btrfs filesystem loading

[Michał Zegan]

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That seems to do the trick, thanks

W dniu 29.12.2016 o 17:53, Roman Mamedov pisze:
> On Thu, 29 Dec 2016 16:42:09 +0100
> Michał Zegan <webczat_200@poczta.onet.pl> wrote:
> 
>> I have odroid c2, processor architecture aarch64, linux kernel from
>> master as of today from http://github.com/torwalds/linux.git.
>> It seems that the btrfs module cannot be loaded. The only thing that
>> happens is that after modprobe i see:
>> modprobe: can't load module btrfs (kernel/fs/btrfs/btrfs.ko.gz): unknown
>> symbol in module, or unknown parameter
>> No errors in dmesg, like I have ignore_loglevel in kernel cmdline and no
>> logs in console appear except logs for loading dependencies like xor
>> module, but that is probably not important.
>> The kernel has been recompiled few minutes ago from scratch, the only
>> thing left was .config file. What is that? other modules load correctly
>> from what I can see.
> 
> In the past there's been some trouble with crc32 dependencies:
> https://www.spinics.net/lists/linux-btrfs/msg32104.html
> Not sure if that's relevant anymore, but in any case, check if you have
> crc32-related stuff either built-in or compiled as modules, if latter, try
> loading those before btrfs (/lib/modules/*/kernel/crypto/crc32*)
> 


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