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    SubjectRe: linux-next - WARNING: at fs/block_dev.c:824 bd_link_disk_holder+0x92/0x1ac()
    On 01/12/2011 06:34 PM, Valdis.Kletnieks@vt.edu wrote:
    > Seen in a boot of yesterday's linux-next. The 'W' flag was due to the
    > already-reported 'WARNING: at kernel/workqueue.c:1202 worker_enter_idle'.
    > Not sure if it's a block_dev or dm/LVM issue, so I'm cc:'ing both groups. I wonder
    > if the fact I still have 'CONFIG_DEVTMPFS=n' is involved (it's apparently ticking off
    > dracut before and after the warning).
    >
    > [ 16.840333] dracut: Found volume group "vg_blackice" using metadata type lvm2
    > [ 16.892282] dracut: The link /dev/vg_blackice/opt should had been created by udev but it was not found. Falling back to direct link creation.
    > [ 16.912627] ------------[ cut here ]------------
    > [ 16.912635] WARNING: at fs/block_dev.c:824 bd_link_disk_holder+0x92/0x1ac()

    That seems to be
    WARN_ON_ONCE(!bdev->bd_holder || bdev->bd_holder_disk);
    added in patch
    http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commitdiff;h=e09b457bdb7e8d23fc54dcef0930ac697d8de895
    "block: simplify holder symlink handling"

    dm linear just claims device in table constructor, I don't think it is bug in DM code.

    > [ 16.912638] Hardware name: Latitude E6500
    > [ 16.912640] Modules linked in:
    > [ 16.912644] Pid: 1920, comm: lvm Tainted: G W 2.6.37-next-20110111 #1
    > [ 16.912647] Call Trace:
    > [ 16.912653] [<ffffffff8103a989>] ? warn_slowpath_common+0x80/0x98
    > [ 16.912657] [<ffffffff8103a9b6>] ? warn_slowpath_null+0x15/0x17
    > [ 16.912660] [<ffffffff8111fb03>] ? bd_link_disk_holder+0x92/0x1ac
    > [ 16.912665] [<ffffffff8139b875>] ? open_dev+0x76/0x9e
    > [ 16.912668] [<ffffffff8139bc9d>] ? dm_get_device+0x147/0x1dc
    > [ 16.912672] [<ffffffff8139d088>] ? linear_ctr+0x98/0xd4
    > [ 16.912676] [<ffffffff8139c289>] ? dm_table_add_target+0x149/0x1d4
    > [ 16.912679] [<ffffffff8139e57c>] ? table_load+0xf0/0x27b
    > [ 16.912683] [<ffffffff8139e48c>] ? table_load+0x0/0x27b
    > [ 16.912686] [<ffffffff8139f326>] ? ctl_ioctl+0x1c6/0x21e
    > [ 16.912690] [<ffffffff8139f38c>] ? dm_ctl_ioctl+0xe/0x12
    > [ 16.912695] [<ffffffff8110258e>] ? do_vfs_ioctl+0x4c4/0x505
    > [ 16.912699] [<ffffffff81102626>] ? sys_ioctl+0x57/0x95
    > [ 16.912703] [<ffffffff8100253b>] ? system_call_fastpath+0x16/0x1b
    > [ 16.912706] ---[ end trace 4eaa2a86a8e2da24 ]---
    > [ 16.925289] dracut: The link /dev/vg_blackice/src should had been created by udev but it was not found. Falling back to direct link creation.
    >

    Milan


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