Re: Unocorrectable errors with RAID1

[Christoph Groth <christoph@grothesque.org>]

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Chris Murphy wrote:
> On Tue, Jan 17, 2017 at 1:25 PM, Christoph Groth
> <christoph@grothesque.org> wrote:
>> Any ideas on what could be done?  If you need help to debug the 
>> problem with
>> btrfs-image, please tell me what I should do.  I can keep the 
>> broken file
>> system around until an image can be created at some later time.
>
> Try 4.9, or even 4.8.5, tons of bugs have been fixed since 4.7.3
> although I don't know off hand if this particular bug is 
> fixed. I did
> recently do a btrfs-image with btrfs-progs v4.9 with -s and did 
> not
> get a segfault.

I compiled btrfs-image.static from btrfs-tools 4.9 (from git) and 
started it from Debian testing's initramfs.  The exact command 
that I use is:

/mnt/btrfs-image.static -c3 -s /dev/sda2 /mnt/mim-s.bim

It runs for a couple of seconds (enough to write 20263936 bytes of 
output) and then quits with

*** Error in `/mnt/btrfs-image.static`: double free or corruption 
    (!prev): 0x00000000009f0940 ***
====== Backtrace: ======
[0x45fb97]
[0x465442]
[0x465c1e]
[0x402694]
[0x402dcb]
[0x4031fe]
[0x4050ff]
[0x405783]
[0x44cb73]
[0x44cdfe]
[0x400b2a]

(I had to type the above off the other screen, but I double 
checked that there are no errors.)

The executable that I used can be downloaded from 
http://groth.fr/btrfs-image.static
Its md5sum is 48abbc82ac6d3c0cb88cba1e5edb85fd.

I hope that this can help someone to see what's going on.

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