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