Commit 3897b6f0 authored Mar 14, 2019 by Andrea Righi Committed by David Sterba Mar 18, 2019

btrfs: raid56: properly unmap parity page in finish_parity_scrub()

Parity page is incorrectly unmapped in finish_parity_scrub(), triggering
a reference counter bug on i386, i.e.:

 [ 157.662401] kernel BUG at mm/highmem.c:349!
 [ 157.666725] invalid opcode: 0000 [#1] SMP PTI

The reason is that kunmap(p_page) was completely left out, so we never
did an unmap for the p_page and the loop unmapping the rbio page was
iterating over the wrong number of stripes: unmapping should be done
with nr_data instead of rbio->real_stripes.

Test case to reproduce the bug:

 - create a raid5 btrfs filesystem:
   # mkfs.btrfs -m raid5 -d raid5 /dev/sdb /dev/sdc /dev/sdd /dev/sde

 - mount it:
   # mount /dev/sdb /mnt

 - run btrfs scrub in a loop:
   # while :; do btrfs scrub start -BR /mnt; done

BugLink: https://bugs.launchpad.net/bugs/1812845


Fixes: 5a6ac9ea ("Btrfs, raid56: support parity scrub on raid56")
CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

parent 0cc068e6

fs/btrfs/raid56.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -2429,8 +2429,9 @@ static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio,
		bitmap_clear(rbio->dbitmap, pagenr, 1);
		kunmap(p);

		for (stripe = 0; stripe < rbio->real_stripes; stripe++)
		for (stripe = 0; stripe < nr_data; stripe++)
		kunmap(page_in_rbio(rbio, stripe, pagenr, 0));
		kunmap(p_page);
		}

		__free_page(p_page);

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