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    SubjectRe: inode->i_wb_list corruption.
    On Wed, Mar 7, 2012 at 6:42 PM, Jan Kara <> wrote:
    > On Tue 06-03-12 23:26:08, Wu Fengguang wrote:
    >  Umm, it's not *that* simple I'd say. E.g. sysfs doesn't provide
    > alloc_inode() method so we use inode_cachep for allocations. And that cache
    > is configured to use inode_init_once().
    > Also note that the error message is:
    > list_del corruption. prev->next should be ffff8801c2f41b18, but was (null)
    > Which means that our inode had correct i_wb_list.prev but the previous
    > inode had NULL in But that means that both inodes were
    > linked into the list at some point. So it does not seem like an
    > initialization issue to me...
    >                                                                Honza
    I still want to know how to reproduce this bug. I add the following
    patch to the kernel fc-16 3.2.9-1

    diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
    index 5b4a936..568ed0a 100644
    --- a/fs/fs-writeback.c
    +++ b/fs/fs-writeback.c
    @@ -192,8 +192,13 @@ void bdi_start_background_writeback(struct
    backing_dev_info *bdi)
    void inode_wb_list_del(struct inode *inode)
    struct backing_dev_info *bdi = inode_to_bdi(inode);
    + struct list_head *pos;

    + list_for_each(pos, &inode->i_wb_list) {
    + printk(KERN_EMERG "list entry: %p; next: %p; prev: %p",
    + pos, pos->next, pos->prev);
    + }
    So on every inode_wb_list_del, it will show the whole list.

    and Doing while true; do touch a && rm -f a; done for almost one day
    without any problem.

    So How to reproduce it??

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      Last update: 2012-03-09 09:37    [W:0.020 / U:43.724 seconds]
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