Re: [PATCH v4] ext4: truncate during setxattr leads to kernel panic

[kernel test robot <lkp@intel.com>]

Hi Artem,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tytso-ext4/dev]
[also build test WARNING on linus/master v5.19-rc6 next-20220713]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Artem-Blagodarenko/ext4-truncate-during-setxattr-leads-to-kernel-panic/20220711-232350
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
config: um-x86_64_defconfig (https://download.01.org/0day-ci/archive/20220714/202207141731.mergfpu3-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/600aeea1cc6d36f380862bb88e50b670e0a57e4f
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Artem-Blagodarenko/ext4-truncate-during-setxattr-leads-to-kernel-panic/20220711-232350
        git checkout 600aeea1cc6d36f380862bb88e50b670e0a57e4f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=x86_64 SHELL=/bin/bash fs/ext4/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> fs/ext4/xattr.c:1563:15: warning: no previous prototype for 'delayed_iput' [-Wmissing-prototypes]
    1563 | noinline void delayed_iput(struct inode *inode, struct delayed_iput_work *work)
         |               ^~~~~~~~~~~~


vim +/delayed_iput +1563 fs/ext4/xattr.c

  1562	
> 1563	noinline void delayed_iput(struct inode *inode, struct delayed_iput_work *work)
  1564	{
  1565		if (!inode) {
  1566			kfree(work);
  1567			return;
  1568		}
  1569	
  1570		if (!work) {
  1571			iput(inode);
  1572		} else {
  1573			INIT_WORK(&work->work, delayed_iput_fn);
  1574			work->inode = inode;
  1575			queue_work(EXT4_SB(inode->i_sb)->s_misc_wq, &work->work);
  1576		}
  1577	}
  1578	

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