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    SubjectRe: 2.6.33.3-rt16 Oops caused by umount
    On Wed, 28 Apr 2010, Xianghua Xiao wrote:
    > Just tried the patch, still got umount hang, please see below.

    Can you please apply the patch below and provide the debug output ?

    Thanks,

    tglx
    ---
    fs/file_table.c | 22 +++++++++++++++++++++-
    1 file changed, 21 insertions(+), 1 deletion(-)

    Index: linux-2.6-tip/fs/file_table.c
    ===================================================================
    --- linux-2.6-tip.orig/fs/file_table.c
    +++ linux-2.6-tip/fs/file_table.c
    @@ -410,7 +410,27 @@ int fs_may_remount_ro(struct super_block
    list = &sb->s_files;
    #endif
    list_for_each_entry(file, list, f_u.fu_list) {
    - struct inode *inode = file->f_path.dentry->d_inode;
    + struct inode *inode;
    +
    + if (!file->f_path) {
    + printk(KERN_ERR "file %p fpath == NULL\n",
    + file);
    + continue;
    + }
    +
    + if (!file->f_path.dentry) {
    + printk(KERN_ERR "file %p dentry == NULL\n",
    + file);
    + continue;
    + }
    +
    + if (!file->f_path.dentry->d_inode) {
    + printk(KERN_ERR "file %p d_inode == NULL\n",
    + file);
    + continue;
    + }
    +
    + inode = file->f_path.dentry->d_inode;

    /* File with pending delete? */
    if (inode->i_nlink == 0)

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