Re: Filesystem locks up, also with older kernel on any action after booting into 4.7-rc4 once

[Hans van Kranenburg <hans.van.kranenburg@mendix.com>]

On 07/02/2016 07:14 PM, Hans van Kranenburg wrote:
> I just rebooted a VM into a 4.7 kernel. The joy didn't last long. After
> 177 seconds the btrfs data partition (root is on ext4) locked up. Worse,
> it keeps locking up on any action performed even when  rebooting it with
> older kernels again. D: The filesystem initially mounts fine, but then
> locks up again immediately.
>
> Linux stacheldraht 4.7.0-rc4-amd64 #1 SMP Debian 4.7~rc4-1~exp1
> (2016-06-20) x86_64 GNU/Linux
>
> ps output shows [btrfs-transaction] in D state:
>
> root      1108  0.0  0.0      0     0 ?        D    17:42   0:00  \_
> [btrfs-transacti]
>
> From dmesg:
>
> [blah blah blah]
>
> So, something happened inside the fs that makes it lock up every time I
> try to do anything with it...

I force-rebooted the poor thing again, and mounted the filesystem ro. It 
mounts without any complaint. I can see all files now, I can do sub list 
etc...

So I think I'm going to copy some data to a new filesystem on a new 
block device just in case. The thing has to move to new storage anyway 
it's about 100 subvolumes with about 150GB of data, so that's a nice 
excercise with send/receive.

-- 
Hans van Kranenburg - System / Network Engineer
T +31 (0)10 2760434 | hans.van.kranenburg@mendix.com | www.mendix.com