Re: [PATCH] btrfs: fix deadlock when writing out space cache

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On 11/15/2017 06:46 PM, Liu Bo wrote:
On Wed, Nov 15, 2017 at 04:20:52PM -0500, Josef Bacik wrote:
From: Josef Bacik <jbacik@xxxxxx>

If we fail to prepare our pages for whatever reason (out of memory in
our case) we need to make sure to drop the block_group->data_rwsem,
otherwise hilarity ensues.


Thanks Josef, I searched all the logs and it looks like we've really only hit this twice this month. It's surprising we haven't seen this more given how often we OOM.

-chris
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