Hi,

Le 27/10/2016 à 01:54, Lionel Bouton a écrit :
>
> I'll post the final result of the btrfs replace later (it's currently at
> 5.6% after 45 minutes).

Result : kernel panic (so 4.8.4 didn't solve my main problem).
Unfortunately I don't have a remote KVM anymore so I couldn't capture
this one. panic=60 however did its job twice (I tried to mount the
filesystem again) confirming that a panic occured.

It seems the problem may be located at a precise location. Yesterday the
last replace resume logged :
Oct 26 00:40:56 zagreus kernel: BTRFS info (device sdb2): continuing
dev_replace from <missing disk> (devid 7) to /dev/sdb2 @12%

And today I was switching between a screen terminal windows when the
crash happened and the replace was at 12.6%. A mount triggers the crash
in ~20 seconds which is similar to what happened yesterday on the last try.

I've successfully canceled the replace to get back a usable system.

I'll stop for tonight and see what happens during the day. I'd like to
try a device add / delete next but I'm worried I could end up with a
completely unusable filesystem if the device delete hits the same
problem than replace.
If the replace resuming on mount crashes the system I can cancel it but
there's no way to do so with a device delete. Or is by any chance the
skip_balance mount option a way to cancel a delete ?

Best regards,

Lionel
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