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Message-ID: <20190104203329.GA57873@jaegeuk-macbookpro.roam.corp.google.com>
Date: Fri, 4 Jan 2019 12:33:29 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Sahitya Tummala <stummala@...eaurora.org>
Cc: Chao Yu <yuchao0@...wei.com>,
linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] f2fs: fix sbi->extent_list corruption issue
On 01/04, Sahitya Tummala wrote:
> On Mon, Nov 26, 2018 at 10:17:20AM +0530, Sahitya Tummala wrote:
> > When there is a failure in f2fs_fill_super() after/during
> > the recovery of fsync'd nodes, it frees the current sbi and
> > retries again. This time the mount is successful, but the files
> > that got recovered before retry, still holds the extent tree,
> > whose extent nodes list is corrupted since sbi and sbi->extent_list
> > is freed up. The list_del corruption issue is observed when the
> > file system is getting unmounted and when those recoverd files extent
> > node is being freed up in the below context.
> >
> > list_del corruption. prev->next should be fffffff1e1ef5480, but was (null)
> > <...>
> > kernel BUG at kernel/msm-4.14/lib/list_debug.c:53!
> > task: fffffff1f46f2280 task.stack: ffffff8008068000
> > lr : __list_del_entry_valid+0x94/0xb4
> > pc : __list_del_entry_valid+0x94/0xb4
> > <...>
> > Call trace:
> > __list_del_entry_valid+0x94/0xb4
> > __release_extent_node+0xb0/0x114
> > __free_extent_tree+0x58/0x7c
> > f2fs_shrink_extent_tree+0xdc/0x3b0
> > f2fs_leave_shrinker+0x28/0x7c
> > f2fs_put_super+0xfc/0x1e0
> > generic_shutdown_super+0x70/0xf4
> > kill_block_super+0x2c/0x5c
> > kill_f2fs_super+0x44/0x50
> > deactivate_locked_super+0x60/0x8c
> > deactivate_super+0x68/0x74
> > cleanup_mnt+0x40/0x78
> > __cleanup_mnt+0x1c/0x28
> > task_work_run+0x48/0xd0
> > do_notify_resume+0x678/0xe98
> > work_pending+0x8/0x14
> >
> > Fix this by cleaning up inodes, extent tree and nodes of those
> > recovered files before freeing up sbi and before next retry.
> >
> Hi Jaegeuk, Chao,
>
> I have observed another scenario where the similar list corruption issue
> can happen with sbi->inode_list as well. If recover_fsync_data()
> fails at some point in write_checkpoint() due to some error and if
> those recovered inodes are still dirty, then after the mount is
> successful, this issue is observed when that dirty inode is under
> writeback.
recover_fsync_data() does iget/iput in pair, and destroy_fsync_dnodes() drops
its dirty list and call iput(), when there is an error. So, after then, there'd
be no dirty inodes. If there's no error, checkpoint() flushes quota/dentry pages
in dirty inodes as well. Can we check where this dirty inode came from?
Oh, one sceanrio can be an error by f2fs_disable_checkpoint() which will do GC.
>
> [ 90.400500] list_del corruption. prev->next should be ffffffed1f566208, but was (null)
> [ 90.675349] Call trace:
> [ 90.677869] __list_del_entry_valid+0x94/0xb4
> [ 90.682351] remove_dirty_inode+0xac/0x114
> [ 90.686563] __f2fs_write_data_pages+0x6a8/0x6c8
> [ 90.691302] f2fs_write_data_pages+0x40/0x4c
> [ 90.695695] do_writepages+0x80/0xf0
> [ 90.699372] __writeback_single_inode+0xdc/0x4ac
> [ 90.704113] writeback_sb_inodes+0x280/0x440
> [ 90.708501] wb_writeback+0x1b8/0x3d0
> [ 90.712267] wb_workfn+0x1a8/0x4d4
> [ 90.715765] process_one_work+0x1c0/0x3d4
> [ 90.719883] worker_thread+0x224/0x344
> [ 90.723739] kthread+0x120/0x130
> [ 90.727055] ret_from_fork+0x10/0x18
>
> I think it is better to cleanup those inodes completely before freeing sbi
> and before next retry as done in this patch. Would you like to re-consider
> this patch for this new issue?
The patch was merged in mainline already.
Could you take a look at this patch?
>From cb1d20e640402beed300c2bdce79311ee8a781ad Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <jaegeuk@...nel.org>
Date: Fri, 4 Jan 2019 12:29:00 -0800
Subject: [PATCH] f2fs: sync filesystem after roll-forward recovery
Some works after roll-forward recovery can get an error which will release
all the data structures. Let's flush them in order to make it clean.
One possible corruption came from:
[ 90.400500] list_del corruption. prev->next should be ffffffed1f566208, but was (null)
[ 90.675349] Call trace:
[ 90.677869] __list_del_entry_valid+0x94/0xb4
[ 90.682351] remove_dirty_inode+0xac/0x114
[ 90.686563] __f2fs_write_data_pages+0x6a8/0x6c8
[ 90.691302] f2fs_write_data_pages+0x40/0x4c
[ 90.695695] do_writepages+0x80/0xf0
[ 90.699372] __writeback_single_inode+0xdc/0x4ac
[ 90.704113] writeback_sb_inodes+0x280/0x440
[ 90.708501] wb_writeback+0x1b8/0x3d0
[ 90.712267] wb_workfn+0x1a8/0x4d4
[ 90.715765] process_one_work+0x1c0/0x3d4
[ 90.719883] worker_thread+0x224/0x344
[ 90.723739] kthread+0x120/0x130
[ 90.727055] ret_from_fork+0x10/0x18
Reported-by: Sahitya Tummala <stummala@...eaurora.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
fs/f2fs/super.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 547cb7459be7..bb02186293a3 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -3357,7 +3357,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
if (test_opt(sbi, DISABLE_CHECKPOINT)) {
err = f2fs_disable_checkpoint(sbi);
if (err)
- goto free_meta;
+ goto sync_free_meta;
} else if (is_set_ckpt_flags(sbi, CP_DISABLED_FLAG)) {
f2fs_enable_checkpoint(sbi);
}
@@ -3370,7 +3370,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
/* After POR, we can run background GC thread.*/
err = f2fs_start_gc_thread(sbi);
if (err)
- goto free_meta;
+ goto sync_free_meta;
}
kvfree(options);
@@ -3392,6 +3392,10 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
f2fs_update_time(sbi, REQ_TIME);
return 0;
+sync_free_meta:
+ /* safe to flush all the data */
+ sync_filesystem(sbi->sb);
+
free_meta:
/* flush dirty orphan inode objects */
f2fs_sync_inode_meta(sbi);
--
2.19.0.605.g01d371f741-goog
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