From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Mason <chris.mason@oracle.com>
Subject: Re: [2.6.39-rc1] extent reference leaking...
Date: Wed, 30 Mar 2011 07:24:10 -0400
Message-ID: <1301484231-sup-8860@think>
References: <AANLkTimdjZXmbAmxEEQQ2_DA9DG1HMnvQhOcMP176BTV@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Cc: Linux BTRFS <linux-btrfs@vger.kernel.org>
To: Daniel J Blueman <daniel.blueman@gmail.com>
Return-path: <linux-btrfs-owner@vger.kernel.org>
In-reply-to: <AANLkTimdjZXmbAmxEEQQ2_DA9DG1HMnvQhOcMP176BTV@mail.gmail.com>
List-ID: <linux-btrfs.vger.kernel.org>

Excerpts from Daniel J Blueman's message of 2011-03-30 06:37:57 -0400:
> When running the Linux Test Project against a BTRFS RAID 1 array,
> after some time I see BTRFS trying to free an extent that still has
> state [1].
> 
> Let me know if anyone is interested in a more specific reproducer and
> I'll take a look.

Very interested.  I didn't see this one in testing and it isn't good at
all.

-chris

> 
> Daniel
> 
> --- [1]
> 
> WARNING: at fs/btrfs/extent_io.c:3371 free_extent_buffer+0x31/0x40()
> Hardware name: X8STi
> Modules linked in: tun microcode loop raid10 raid456 async_memcpy
> async_pq async_xor xor async_raid6_recov raid6_pq async_tx raid1 raid0
> multipath linear md_mod
> Pid: 14202, comm: ftest08 Tainted: G        W   2.6.39-rc1-350cd #1
> Call Trace:
>  [<ffffffff8105f81a>] warn_slowpath_common+0x7a/0xb0
>  [<ffffffff8105f865>] warn_slowpath_null+0x15/0x20
>  [<ffffffff812b6711>] free_extent_buffer+0x31/0x40
>  [<ffffffff8127ad40>] btrfs_lock_root_node+0x20/0x50
>  [<ffffffff8127b530>] btrfs_search_slot+0x400/0x790
>  [<ffffffff81275eb5>] ? btrfs_alloc_path+0x15/0x30
>  [<ffffffff81275eb5>] ? btrfs_alloc_path+0x15/0x30
>  [<ffffffff8128e053>] btrfs_lookup_csums_range+0x83/0x4b0
>  [<ffffffff812b56be>] ? unmap_extent_buffer+0xe/0x40
>  [<ffffffff812a8744>] ? btrfs_file_extent_compression+0xe4/0xf0
>  [<ffffffff812cd325>] copy_items+0x315/0x3f0
>  [<ffffffff812cf03a>] btrfs_log_inode+0x3ea/0x520
>  [<ffffffff812ce3bb>] ? start_log_trans+0x6b/0x150
>  [<ffffffff812cf463>] btrfs_log_inode_parent+0x193/0x2e0
>  [<ffffffff81156424>] ? dget_parent+0x94/0x100
>  [<ffffffff811563a7>] ? dget_parent+0x17/0x100
>  [<ffffffff812cf664>] btrfs_log_dentry_safe+0x44/0x70
>  [<ffffffff812a5afb>] btrfs_sync_file+0xeb/0x190
>  [<ffffffff8116bb43>] vfs_fsync_range+0x73/0x90
>  [<ffffffff81141470>] ? fget_raw+0x260/0x260
>  [<ffffffff8116bbb7>] vfs_fsync+0x17/0x20
>  [<ffffffff8116bbf5>] do_fsync+0x35/0x60
>  [<ffffffff8116bc4b>] sys_fsync+0xb/0x10
>  [<ffffffff816edf3b>] system_call_fastpath+0x16/0x1b
> ---[ end trace a7919e7f17c0a728 ]---