This is a note to let you know that I've just added the patch titled
Btrfs: fix crash due to not cleaning up tree log block's dirty bits
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
btrfs-fix-crash-due-to-not-cleaning-up-tree-log-block-s-dirty-bits.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1846430c24d66e85cc58286b3319c82cd54debb2 Mon Sep 17 00:00:00 2001
From: Liu Bo <bo.li.liu@xxxxxxxxxx>
Date: Thu, 25 Jan 2018 11:02:51 -0700
Subject: Btrfs: fix crash due to not cleaning up tree log block's dirty bits
From: Liu Bo <bo.li.liu@xxxxxxxxxx>
commit 1846430c24d66e85cc58286b3319c82cd54debb2 upstream.
In cases that the whole fs flips into readonly status due to failures in
critical sections, then log tree's blocks are still dirty, and this leads
to a crash during umount time, the crash is about use-after-free,
umount
-> close_ctree
-> stop workers
-> iput(btree_inode)
-> iput_final
-> write_inode_now
-> ...
-> queue job on stop'd workers
cc: <stable@xxxxxxxxxxxxxxx> v3.12+
Fixes: 681ae50917df ("Btrfs: cleanup reserved space when freeing tree log on error")
Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
Reviewed-by: Josef Bacik <jbacik@xxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/tree-log.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -2201,6 +2201,9 @@ static noinline int walk_down_log_tree(s
clean_tree_block(trans, root, next);
btrfs_wait_tree_block_writeback(next);
btrfs_tree_unlock(next);
+ } else {
+ if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags))
+ clear_extent_buffer_dirty(next);
}
WARN_ON(root_owner !=
@@ -2279,6 +2282,9 @@ static noinline int walk_up_log_tree(str
clean_tree_block(trans, root, next);
btrfs_wait_tree_block_writeback(next);
btrfs_tree_unlock(next);
+ } else {
+ if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags))
+ clear_extent_buffer_dirty(next);
}
WARN_ON(root_owner != BTRFS_TREE_LOG_OBJECTID);
@@ -2355,6 +2361,9 @@ static int walk_log_tree(struct btrfs_tr
clean_tree_block(trans, log, next);
btrfs_wait_tree_block_writeback(next);
btrfs_tree_unlock(next);
+ } else {
+ if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags))
+ clear_extent_buffer_dirty(next);
}
WARN_ON(log->root_key.objectid !=
Patches currently in stable-queue which might be from bo.li.liu@xxxxxxxxxx are
queue-3.18/btrfs-fix-crash-due-to-not-cleaning-up-tree-log-block-s-dirty-bits.patch
queue-3.18/btrfs-fix-deadlock-in-run_delalloc_nocow.patch