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    SubjectRe: [Kernel BUG] ext4 for v2.6.32 round II
    On Wed, Sep 30, 2009 at 06:57:00PM -0700, Linus Torvalds wrote:
    >
    >
    > On Thu, 1 Oct 2009, Markus Trippelsdorf wrote:
    > >
    > > Running latest git I get the following kernel BUG message:
    > >
    > > ------------[ cut here ]------------
    > > Kernel BUG at ffffffff810efa89 [verbose debug info unavailable]
    >
    > You really shouldn't turn off verbose debug info unless you are _really_
    > tight on memory in some embedded device. It's not that complex, nor does
    > it use a lot of memory, and it makes the error report much harder to
    > figure out when the verbose debug output information isn't available.
    >
    > But in this case I can do it by just looking at the function/offset:
    >
    > > RIP: 0010:[<ffffffff810efa89>] [<ffffffff810efa89>] ext4_num_dirty_pages+0x113/0x213
    >
    > The only BUG_ON() that seems relevant in that function (at least with the
    > config I tried with) ends up being
    >
    > fs/ext4/inode.c:1184
    >
    > in my sources, which is from "page_buffers(page)", which has a
    >
    > BUG_ON(!PagePrivate(page));
    >
    > in it. And that would have been much easier to figure out if you had had
    > CONFIG_DEBUG_BUGVERBOSE enabled..
    >

    You're right (with CONFIG_DEBUG_BUGVERBOSE=y):

    ------------[ cut here ]------------
    kernel BUG at fs/ext4/inode.c:1184!
    ...

    > Now over to the ext4 people to actually hopefully _solve_ the bug. Maybe
    > bisection would help.

    --
    Markus


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