LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Folkert van Heusden <folkert@vanheusden.com>
To: Kay Sievers <kay.sievers@vrfy.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, linux-kernel@vger.kernel.org
Subject: Re: [2.6.26] kobject_add_internal failed for 2:0 with -EEXIST / unable to handle kernel NULL pointer dereference in sysfs_create_link
Date: Wed, 29 Oct 2008 16:25:52 +0100	[thread overview]
Message-ID: <20081029152550.GT11214@vanheusden.com> (raw)
In-Reply-To: <ac3eb2510810290749o2dd062b5m7b966d2d25b69714@mail.gmail.com>

> >> >> > While running my http://vanheusden.com/pyk/ script (which randomly
> >> >> > inserts and removes modules) I triggered the folllowing oops in a 2.6.26
> >> >> > kernel on an IBM xSeries 260. This oops (in fact no oops at all) did not
> >> >> > get triggered in a 2.6.18 kernel on that system.
> >> >> >
> >> >> > [   42.507375] FDC 0 is a National Semiconductor PC87306
> >> >> > [   42.509057] kobject_add_internal failed for 2:0 with -EEXIST, don't try to register things with the same name in the same directory.
> >> >> > [   42.509291] Pid: 5301, comm: modprobe Not tainted 2.6.26-1-amd64 #1
> >> >> > [   42.509431]
> >> >> > [   42.509433] Call Trace:
> >> >> > [   42.509685]  [<ffffffff8031b031>] kobject_add_internal+0x13f/0x17e
> > ...
> >> >> > [   42.511519]  [<ffffffff8027d23b>] bdi_register+0x57/0xb4
> >> >>
> >> >> Looks like bdi sees two devices with the same devnum, or didn't
> >> >> cleanup an old entry. What does: ls -l "/sys/class/bdi/" print?
> >> >
> >> > The following:
> >> > folkert@debiantesthw:~$ ls -l /sys/class/bdi/
> >> > drwxr-xr-x 3 root root 0 2008-10-28 18:32 2:0
> >> > drwxr-xr-x 3 root root 0 2008-10-28 18:32 2:1
> >>
> >> Oh, you are running the old sysfs layout without symlinks. Care to
> >> tell where the "device" link in these directories points to?
> >
> > None exist:
> > folkert@debiantesthw:~$ ls -la /sys/class/bdi/*/device
> > ls: cannot access /sys/class/bdi/*/device: No such file or directory
> 
> Ah, sorry. Seems the bdi stuff never got to pass the usual parent
> device with the device registration, to let the bdi device show up at
> the right place in the device tree.
> 
> Let's see what current devices on your box have the major 2:
>   find /sys -name dev | xargs grep '^2:'

/sys/block/fd0/dev:2:0
/sys/block/fd1/dev:2:1

As my script does modprobe/rmmod in parallel (4 processes) maybe it is a
conflict of one process doing an modprobe of floppy while the other does
an rmmod? Or both a modprobe?


Folkert van Heusden

-- 
Multi tail barnamaj mowahib li mora9abat attasjilat wa nataij awamir
al 7asoub. damj, talwin, mora9abat attarchi7 wa ila akhirih.
http://www.vanheusden.com/multitail/
----------------------------------------------------------------------
Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com

  reply	other threads:[~2008-10-29 15:26 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-28 15:11 Folkert van Heusden
2008-10-28 23:07 ` Kay Sievers
2008-10-29  9:40   ` Folkert van Heusden
2008-10-29 10:01     ` Bryan Wu
2008-10-29 12:28       ` Kay Sievers
2008-10-29 12:25     ` Kay Sievers
2008-10-29 13:27       ` Folkert van Heusden
2008-10-29 14:49         ` Kay Sievers
2008-10-29 15:25           ` Folkert van Heusden [this message]
2008-10-29 21:51             ` Kay Sievers
2008-10-30 10:55               ` Folkert van Heusden
2008-10-30 23:06                 ` Kay Sievers
2008-10-30 23:23                   ` Kay Sievers
2008-10-31  1:13                     ` Kay Sievers
2008-10-31  9:28                     ` Peter Zijlstra
2008-11-03 11:53                       ` Kay Sievers
2008-11-03 11:55                         ` Peter Zijlstra

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20081029152550.GT11214@vanheusden.com \
    --to=folkert@vanheusden.com \
    --cc=a.p.zijlstra@chello.nl \
    --cc=kay.sievers@vrfy.org \
    --cc=linux-kernel@vger.kernel.org \
    --subject='Re: [2.6.26] kobject_add_internal failed for 2:0 with -EEXIST / unable to handle kernel NULL pointer dereference in sysfs_create_link' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).