linux-kernel - Re: [PATCH] ext4: goto right label 'out_mmap_sem' in ext4

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Message-ID: <174226639136.1025346.16724513902690237266.b4-ty@mit.edu>
Date: Mon, 17 Mar 2025 23:41:20 -0400
From: "Theodore Ts'o" <tytso@....edu>
To: linux-ext4@...r.kernel.org, libaokun@...weicloud.com
Cc: "Theodore Ts'o" <tytso@....edu>, adilger.kernel@...ger.ca, jack@...e.cz,
        bfoster@...hat.com, linux-kernel@...r.kernel.org, yi.zhang@...wei.com,
        yangerkun@...wei.com, Baokun Li <libaokun1@...wei.com>
Subject: Re: [PATCH] ext4: goto right label 'out_mmap_sem' in ext4_setattr()


On Thu, 13 Feb 2025 19:22:47 +0800, libaokun@...weicloud.com wrote:
> Otherwise, if ext4_inode_attach_jinode() fails, a hung task will
> happen because filemap_invalidate_unlock() isn't called to unlock
> mapping->invalidate_lock. Like this:
> 
> EXT4-fs error (device sda) in ext4_setattr:5557: Out of memory
> INFO: task fsstress:374 blocked for more than 122 seconds.
>       Not tainted 6.14.0-rc1-next-20250206-xfstests-dirty #726
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:fsstress state:D stack:0     pid:374   tgid:374   ppid:373
>                                   task_flags:0x440140 flags:0x00000000
> Call Trace:
>  <TASK>
>  __schedule+0x2c9/0x7f0
>  schedule+0x27/0xa0
>  schedule_preempt_disabled+0x15/0x30
>  rwsem_down_read_slowpath+0x278/0x4c0
>  down_read+0x59/0xb0
>  page_cache_ra_unbounded+0x65/0x1b0
>  filemap_get_pages+0x124/0x3e0
>  filemap_read+0x114/0x3d0
>  vfs_read+0x297/0x360
>  ksys_read+0x6c/0xe0
>  do_syscall_64+0x4b/0x110
>  entry_SYSCALL_64_after_hwframe+0x76/0x7e
> 
> [...]

Applied, thanks!

[1/1] ext4: goto right label 'out_mmap_sem' in ext4_setattr()
      commit: 6b7e17cd4534688c341e900b9a2e42f307a3ff9c

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