linux-ext4 - Re: Oops while going into hibernate

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Date:	Wed, 12 Jan 2011 18:37:23 +0100 (CET)
From:	Sebastian Ott <sebott@...ux.vnet.ibm.com>
To:	"Ted Ts'o" <tytso@....edu>
cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Oops while going into hibernate


On Wed, 12 Jan 2011, Ted Ts'o wrote:
> Since I don't have a machine set up to test hibernation easily at
> hand, I'd really appreciate it if you could try this patch to
> determine which inode had the NULL jinode --- and then once you get
> the device and inode number, to use debugfs's "ncheck" command to map
> the inode number to a pathname.
> 
> If you could do that, it would be a huge help.
ok, will do

> 
> Thanks, regards,
> 
> 						- Ted
> 
> P.S.  Also, if you could try suspending once or twice, with different
> programs running, to see if the inode number and pathname are constant
> or vary, that would also be helpful.
> 
> diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
> index d8b992e..7d6d7d7 100644
> --- a/fs/ext4/ext4_jbd2.h
> +++ b/fs/ext4/ext4_jbd2.h
> @@ -252,8 +252,15 @@ static inline int ext4_journal_force_commit(journal_t *journal)
> 
>  static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode)
>  {
> -	if (ext4_handle_valid(handle))
> +	if (ext4_handle_valid(handle)) {
> +		if (unlikely(EXT4_I(inode)->jinode == NULL)) {
> +			/* Should never happen */
> +			ext4_msg(inode->i_sb, KERN_CRIT, 
> +				 "inode #%lu has NULL jinode", inode->i_ino);
> +			BUG();
> +		}
>  		return jbd2_journal_file_inode(handle, EXT4_I(inode)->jinode);
> +	}
>  	return 0;
>  }
> 
> 
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