linux-kernel - Re: [PATCH -next v2] ext4: fix warning in 'ext4_da_release

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Message-Id: <166771539910.127460.7496410803932369792.b4-ty@mit.edu>
Date:   Sun,  6 Nov 2022 01:16:53 -0500
From:   "Theodore Ts'o" <tytso@....edu>
To:     Ye Bin <yebin10@...wei.com>, linux-ext4@...r.kernel.org,
        adilger.kernel@...ger.ca
Cc:     "Theodore Ts'o" <tytso@....edu>, jack@...e.cz,
        syzbot+c740bb18df70ad00952e@...kaller.appspotmail.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next v2] ext4: fix warning in 'ext4_da_release_space'

On Tue, 18 Oct 2022 10:27:01 +0800, Ye Bin wrote:
> Syzkaller report issue as follows:
> EXT4-fs (loop0): Free/Dirty block details
> EXT4-fs (loop0): free_blocks=0
> EXT4-fs (loop0): dirty_blocks=0
> EXT4-fs (loop0): Block reservation details
> EXT4-fs (loop0): i_reserved_data_blocks=0
> EXT4-fs warning (device loop0): ext4_da_release_space:1527: ext4_da_release_space: ino 18, to_free 1 with only 0 reserved data blocks
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 92 at fs/ext4/inode.c:1528 ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1524
> Modules linked in:
> CPU: 0 PID: 92 Comm: kworker/u4:4 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
> Workqueue: writeback wb_workfn (flush-7:0)
> RIP: 0010:ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1528
> RSP: 0018:ffffc900015f6c90 EFLAGS: 00010296
> RAX: 42215896cd52ea00 RBX: 0000000000000000 RCX: 42215896cd52ea00
> RDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000
> RBP: 1ffff1100e907d96 R08: ffffffff816aa79d R09: fffff520002bece5
> R10: fffff520002bece5 R11: 1ffff920002bece4 R12: ffff888021fd2000
> R13: ffff88807483ecb0 R14: 0000000000000001 R15: ffff88807483e740
> FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00005555569ba628 CR3: 000000000c88e000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  ext4_es_remove_extent+0x1ab/0x260 fs/ext4/extents_status.c:1461
>  mpage_release_unused_pages+0x24d/0xef0 fs/ext4/inode.c:1589
>  ext4_writepages+0x12eb/0x3be0 fs/ext4/inode.c:2852
>  do_writepages+0x3c3/0x680 mm/page-writeback.c:2469
>  __writeback_single_inode+0xd1/0x670 fs/fs-writeback.c:1587
>  writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1870
>  wb_writeback+0x41f/0x7b0 fs/fs-writeback.c:2044
>  wb_do_writeback fs/fs-writeback.c:2187 [inline]
>  wb_workfn+0x3cb/0xef0 fs/fs-writeback.c:2227
>  process_one_work+0x877/0xdb0 kernel/workqueue.c:2289
>  worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
>  kthread+0x266/0x300 kernel/kthread.c:376
>  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
>  </TASK>
> 
> [...]

Applied, thanks!

[1/1] ext4: fix warning in 'ext4_da_release_space'
      commit: 1b8f787ef547230a3249bcf897221ef0cc78481b

Best regards,
-- 
Theodore Ts'o <tytso@....edu>