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    SubjectRe: [broken-out-2007-07-20-00-22] kernel bug at kernel/params:570
    On Fri, 20 Jul 2007 15:50:47 -0700
    Greg KH <gregkh@suse.de> wrote:

    > On Fri, Jul 20, 2007 at 06:32:21PM +0200, Michal Piotrowski wrote:
    > > Hi Greg,
    > >
    > > This looks like a sysfs bug
    > > http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/broken-out-2007-07-20-00-22/00003.jpg
    > >
    > > l *kernel_param_sysfs_setup+0x75
    > > 0xc13c0894 is in kernel_param_sysfs_setup (kernel/params.c:570).
    > > 565 mk->mod = THIS_MODULE;
    > > 566 kobj_set_kset_s(mk, module_subsys);
    > > 567 kobject_set_name(&mk->kobj, name);
    > > 568 kobject_init(&mk->kobj);
    > > 569 ret = kobject_add(&mk->kobj);
    > > 570 BUG_ON(ret < 0);
    > > 571 param_sysfs_setup(mk, kparam, num_params, name_skip);
    > > 572 kobject_uevent(&mk->kobj, KOBJ_ADD);
    > > 573 }
    > > 574
    > >
    > > http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/broken-out-2007-07-20-00-22/mm-config
    >
    > What kernel version is this happening on? The -mm tree? Can you try
    > Linus's tree instead?
    >
    > It looks like there was some needed information right before the first
    > stack dump, showing exactly what kobject was trying to be added that was
    > already present. Odds are this is a kernel parameter with the same name
    > as a duplicate one within the same module, but the trick is going to be
    > trying to figure out what module is causing this.
    >
    > So it's not a sysfs bug, but rather a driver issue that this is
    > catching.

    In that case a BUG was way too harsh treatment, and in fact directly
    contributed to our inability to debug the bug!

    Can we wind that back a bit? Add some useful printks and then recover
    in some fashion?

    -
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