4.4.1

1 files changed, 78 insertions, 0 deletions

diff --git a/0001-4.4-revert-btrfs.patch b/0001-4.4-revert-btrfs.patch
new file mode 100644
index 000000000000..4b56e242ec2d
--- /dev/null
+++ b/0001-4.4-revert-btrfs.patch
@@ -0,0 +1,78 @@
+From 80ad623edd2d0ccb47d85357ee31c97e6c684e82 Mon Sep 17 00:00:00 2001
+From: David Sterba <dsterba@suse.com>
+Date: Mon, 25 Jan 2016 11:02:06 +0100
+Subject: Revert "btrfs: clear PF_NOFREEZE in cleaner_kthread()"
+
+This reverts commit 696249132158014d594896df3a81390616069c5c. The
+cleaner thread can block freezing when there's a snapshot cleaning in
+progress and the other threads get suspended first. From the logs
+provided by Martin we're waiting for reading extent pages:
+
+kernel: PM: Syncing filesystems ... done.
+kernel: Freezing user space processes ... (elapsed 0.015 seconds) done.
+kernel: Freezing remaining freezable tasks ...
+kernel: Freezing of tasks failed after 20.003 seconds (1 tasks refusing to freeze, wq_busy=0):
+kernel: btrfs-cleaner   D ffff88033dd13bc0     0   152      2 0x00000000
+kernel: ffff88032ebc2e00 ffff88032e750000 ffff88032e74fa50 7fffffffffffffff
+kernel: ffffffff814a58df 0000000000000002 ffffea000934d580 ffffffff814a5451
+kernel: 7fffffffffffffff ffffffff814a6e8f 0000000000000000 0000000000000020
+kernel: Call Trace:
+kernel: [<ffffffff814a58df>] ? bit_wait+0x2c/0x2c
+kernel: [<ffffffff814a5451>] ? schedule+0x6f/0x7c
+kernel: [<ffffffff814a6e8f>] ? schedule_timeout+0x2f/0xd8
+kernel: [<ffffffff81076f94>] ? timekeeping_get_ns+0xa/0x2e
+kernel: [<ffffffff81077603>] ? ktime_get+0x36/0x44
+kernel: [<ffffffff814a4f6c>] ? io_schedule_timeout+0x94/0xf2
+kernel: [<ffffffff814a4f6c>] ? io_schedule_timeout+0x94/0xf2
+kernel: [<ffffffff814a590b>] ? bit_wait_io+0x2c/0x30
+kernel: [<ffffffff814a5694>] ? __wait_on_bit+0x41/0x73
+kernel: [<ffffffff8109eba8>] ? wait_on_page_bit+0x6d/0x72
+kernel: [<ffffffff8105d718>] ? autoremove_wake_function+0x2a/0x2a
+kernel: [<ffffffff811a02d7>] ? read_extent_buffer_pages+0x1bd/0x203
+kernel: [<ffffffff8117d9e9>] ? free_root_pointers+0x4c/0x4c
+kernel: [<ffffffff8117e831>] ? btree_read_extent_buffer_pages.constprop.57+0x5a/0xe9
+kernel: [<ffffffff8117f4f3>] ? read_tree_block+0x2d/0x45
+kernel: [<ffffffff8116782a>] ? read_block_for_search.isra.34+0x22a/0x26b
+kernel: [<ffffffff811656c3>] ? btrfs_set_path_blocking+0x1e/0x4a
+kernel: [<ffffffff8116919b>] ? btrfs_search_slot+0x648/0x736
+kernel: [<ffffffff81170559>] ? btrfs_lookup_extent_info+0xb7/0x2c7
+kernel: [<ffffffff81170ee5>] ? walk_down_proc+0x9c/0x1ae
+kernel: [<ffffffff81171c9d>] ? walk_down_tree+0x40/0xa4
+kernel: [<ffffffff8117375f>] ? btrfs_drop_snapshot+0x2da/0x664
+kernel: [<ffffffff8104ff21>] ? finish_task_switch+0x126/0x167
+kernel: [<ffffffff811850f8>] ? btrfs_clean_one_deleted_snapshot+0xa6/0xb0
+kernel: [<ffffffff8117eaba>] ? cleaner_kthread+0x13e/0x17b
+kernel: [<ffffffff8117e97c>] ? btrfs_item_end+0x33/0x33
+kernel: [<ffffffff8104d256>] ? kthread+0x95/0x9d
+kernel: [<ffffffff8104d1c1>] ? kthread_parkme+0x16/0x16
+kernel: [<ffffffff814a7b5f>] ? ret_from_fork+0x3f/0x70
+kernel: [<ffffffff8104d1c1>] ? kthread_parkme+0x16/0x16
+
+As this affects a released kernel (4.4) we need a minimal fix for
+stable kernels.
+
+Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=108361
+Reported-by: Martin Ziegler <ziegler@uni-freiburg.de>
+CC: stable@vger.kernel.org # 4.4
+CC: Jiri Kosina <jkosina@suse.cz>
+Signed-off-by: David Sterba <dsterba@suse.com>
+Signed-off-by: Chris Mason <clm@fb.com>
+---
+ fs/btrfs/disk-io.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
+index 26ef141..404e894 100644
+--- a/fs/btrfs/disk-io.c
++++ b/fs/btrfs/disk-io.c
+@@ -1787,7 +1787,6 @@ static int cleaner_kthread(void *arg)
+ 	int again;
+ 	struct btrfs_trans_handle *trans;
+ 
+-	set_freezable();
+ 	do {
+ 		again = 0;
+ 
+-- 
+cgit v0.12
+