Re: Linux 5.6-rc2

From: Josef Bacik
Date: Sun Feb 16 2020 - 22:02:06 EST

On 2/16/20 9:24 PM, Linus Torvalds wrote:
On Sun, Feb 16, 2020 at 6:08 PM Dave Jones <davej@xxxxxxxxxxxxxxxxx> wrote:

This didn't happen in rc1, but showed up when I booted into rc2 and
tried to and pull some stuff with rsync.

[ 70.794783] BUG: sleeping function called from invalid context at mm/slab.h:565
[ 70.795459] kmem_cache_alloc+0x1d3/0x290
[ 70.795471] alloc_extent_state+0x22/0x1c0
[ 70.795544] __clear_extent_bit+0x3ba/0x580
[ 70.795569] btrfs_truncate_inode_items+0x339/0xe50
[ 70.795647] btrfs_evict_inode+0x269/0x540

At a guess (just by functions involved, and the timing between rc1 and
rc2 - no actual analysis), this is probably due to

28553fa992cb ("Btrfs: fix race between shrinking truncate and fiemap")

which is also marked for stable, so... Filipe?

I assume Filipe wrote this based on my patch here

which makes it so we can allocate safely in this context, but that patch hasn't made it's way to you yet. Do you want it now? It was prep for a much less safe patchset, but is fine by itself. Thanks,