[PATCH 3.16 002/127] btrfs: Fix a deadlock in btrfs_dev_replace_finishing()

From: Greg Kroah-Hartman
Date: Mon Oct 27 2014 - 23:42:22 EST


3.16-stable review patch. If anyone has any objections, please let me know.

------------------

From: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>

commit 12b894cb288d57292b01cf158177b6d5c89a6272 upstream.

btrfs-transacion:5657
[stack snip]
btrfs_bio_map()
btrfs_bio_counter_inc_blocked()
percpu_counter_inc(&fs_info->bio_counter) ###bio_counter > 0(A)
__btrfs_bio_map()
btrfs_dev_replace_lock()
mutex_lock(dev_replace->lock) ###wait mutex(B)

btrfs:32612
[stack snip]
btrfs_dev_replace_start()
btrfs_dev_replace_lock()
mutex_lock(dev_replace->lock) ###hold mutex(B)
btrfs_dev_replace_finishing()
btrfs_rm_dev_replace_blocked()
wait until percpu_counter_sum == 0 ###wait on bio_counter(A)

This bug can be triggered quite easily by the following test script:
http://pastebin.com/MQmb37Cy

This patch will fix the ABBA problem by calling
btrfs_dev_replace_unlock() before btrfs_rm_dev_replace_blocked().

The consistency of btrfs devices list and their superblocks is protected
by device_list_mutex, not btrfs_dev_replace_lock/unlock().
So it is safe the move btrfs_dev_replace_unlock() before
btrfs_rm_dev_replace_blocked().

Reported-by: Zhao Lei <zhaolei@xxxxxxxxxxxxxx>
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
Cc: Stefan Behrens <sbehrens@xxxxxxxxxxxxxxxx>
Signed-off-by: Chris Mason <clm@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/btrfs/dev-replace.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -567,6 +567,8 @@ static int btrfs_dev_replace_finishing(s
btrfs_kobj_rm_device(fs_info, src_device);
btrfs_kobj_add_device(fs_info, tgt_device);

+ btrfs_dev_replace_unlock(dev_replace);
+
btrfs_rm_dev_replace_blocked(fs_info);

btrfs_rm_dev_replace_srcdev(fs_info, src_device);
@@ -580,7 +582,6 @@ static int btrfs_dev_replace_finishing(s
* superblock is scratched out so that it is no longer marked to
* belong to this filesystem.
*/
- btrfs_dev_replace_unlock(dev_replace);
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
mutex_unlock(&root->fs_info->chunk_mutex);



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