From: Greg KH <greg@kroah.com>
To: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, rsa@us.ibm.com, apw@shadowen.org,
balbir@in.ibm.com
Subject: Re: 2.6.24-rc4-mm1 kobject changes broken with hvcs driver on powerpc
Date: Thu, 6 Dec 2007 12:31:18 -0800 [thread overview]
Message-ID: <20071206203118.GA28618@kroah.com> (raw)
In-Reply-To: <47584672.8040201@linux.vnet.ibm.com>
On Fri, Dec 07, 2007 at 12:28:58AM +0530, Balbir Singh wrote:
> Greg KH wrote:
>
> >> Why release the spinlock here? It's done after the count is incremented.
> >> This patch does not seem correct.
> >
> > Doh, you are correct, I'll make sure that I fix this up before applying
> > it.
> >
> > thanks,
> >
> > greg k-h
>
> Hi, Greg,
>
> I ran some tests with the fixed up version of this patch and the system
> fails to come up.
>
> I see the WARN_ON in lib/kref.c:33 and the system fails to boot beyond
> that point. I have not yet found time to debug it though.
That's not good, that warning means that someone has tried to use this
kref _before_ it was initialized, so there is a logic error in the code
that was previously being papered over with the lack of this message in
the kobject code.
I do have this same message availble as a patch for the kobject core, it
would be interesting if you could just run 2.6.24-rc4 with just this
patch:
http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/gregkh-01-driver/kobject-warn.patch
it might take some fuzz to fit properly, but all you really want to do
is add:
WARN_ON(atomic_read(&kobj->kref.refcount));
before the kref_init() call in kobject_init().
thanks,
greg k-h
next prev parent reply other threads:[~2007-12-06 20:29 UTC|newest]
Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-05 5:17 2.6.24-rc4-mm1 Andrew Morton
2007-12-05 9:15 ` 2.6.24-rc4-mm1: kobj changes fallout on powerpc Olof Johansson
2007-12-05 13:11 ` Kamalesh Babulal
2007-12-05 15:46 ` Greg KH
2007-12-05 14:12 ` 2.6.24-rc4-mm1 kobject changes broken with hvcs driver " Kamalesh Babulal
2007-12-05 15:47 ` Greg KH
2007-12-06 18:19 ` Balbir Singh
2007-12-06 18:50 ` Greg KH
2007-12-06 18:49 ` Kamalesh Babulal
2007-12-06 18:58 ` Balbir Singh
2007-12-06 19:21 ` Badari Pulavarty
2007-12-07 1:29 ` Balbir Singh
2007-12-06 20:31 ` Greg KH [this message]
2007-12-06 23:54 ` Badari Pulavarty
2007-12-07 0:32 ` Greg KH
2007-12-07 3:02 ` Kamalesh Babulal
2007-12-07 5:14 ` Greg KH
2007-12-07 22:01 ` Balbir Singh
2007-12-05 23:41 ` 2.6.24-rc4-mm1: hostbyte=0x01 driverbyte=0x00 (now bisected) Alexey Dobriyan
2007-12-06 7:52 ` Hannes Reinecke
2007-12-06 12:08 ` Jens Axboe
2007-12-06 19:19 ` Alexey Dobriyan
2007-12-06 3:15 ` 2.6.24-rc4-mm1 Kernel build fails on S390x Kamalesh Babulal
2007-12-06 7:19 ` Andrew Morton
2007-12-06 6:59 ` 2.6.24-rc4-mm1 Reuben Farrelly
2007-12-06 7:09 ` 2.6.24-rc4-mm1 David Miller
2007-12-07 13:16 ` 2.6.24-rc4-mm1 Ilpo Järvinen
2007-12-12 17:57 ` 2.6.24-rc4-mm1 Cedric Le Goater
2007-12-06 7:35 ` 2.6.24-rc4-mm1 Andrew Morton
2007-12-10 12:24 ` 2.6.24-rc4-mm1 Ilpo Järvinen
2007-12-10 20:05 ` 2.6.24-rc4-mm1 Ilpo Järvinen
2007-12-12 19:21 ` 2.6.24-rc4-mm1 Cedric Le Goater
2007-12-13 17:38 ` tcp_sacktag_one() WARNING (was Re: 2.6.24-rc4-mm1) Cedric Le Goater
2007-12-06 11:49 ` 2.6.24-rc4-mm1 Valdis.Kletnieks
2007-12-06 12:04 ` 2.6.24-rc4-mm1 Andrew Morton
2007-12-06 19:18 ` 2.6.24-rc4-mm1 Valdis.Kletnieks
2007-12-06 19:38 ` 2.6.24-rc4-mm1 Greg KH
2007-12-06 20:04 ` 2.6.24-rc4-mm1 Valdis.Kletnieks
2007-12-06 22:04 ` [dm-devel] 2.6.24-rc4-mm1 Kay Sievers
2007-12-06 22:12 ` Alasdair G Kergon
2007-12-06 23:12 ` Valdis.Kletnieks
2007-12-06 23:24 ` Kay Sievers
2007-12-07 18:20 ` Valdis.Kletnieks
2007-12-07 18:44 ` Kay Sievers
2007-12-07 20:28 ` Valdis.Kletnieks
2007-12-07 20:49 ` Kay Sievers
2007-12-06 22:28 ` 2.6.24-rc4-mm1: VDSOSYM build error Laurent Riffard
2007-12-06 22:37 ` Andrew Morton
2007-12-06 23:28 ` Miles Lane
2007-12-06 23:34 ` Andrew Morton
2007-12-06 23:47 ` Miles Lane
2007-12-07 10:36 ` Ingo Molnar
2007-12-07 1:14 ` [PATCH x86/mm] x86 vDSO: canonicalize sysenter .eh_frame Roland McGrath
2007-12-07 1:27 ` Harvey Harrison
2007-12-07 3:27 ` Miles Lane
2007-12-07 9:44 ` Ingo Molnar
2007-12-07 2:12 ` 2.6.24-rc4-mm1 Dave Young
2007-12-07 22:22 ` 2.6.24-rc4-mm1 Luis R. Rodriguez
2007-12-10 1:07 ` 2.6.24-rc4-mm1 Dave Young
2007-12-09 17:55 ` 2.6.24-rc4-mm1 Nick Kossifidis
[not found] ` <E1J0Yfy-0001V7-Rr@localhost>
2007-12-07 8:35 ` [PATCH BUGFIX] hid: the `bit' in hidinput_mapping_quirks() is an out parameter Fengguang Wu
2007-12-10 10:03 ` Jiri Kosina
2007-12-07 14:34 ` broken suspend (sched related) [Was: 2.6.24-rc4-mm1] Jiri Slaby
2007-12-07 15:11 ` Ingo Molnar
2007-12-07 17:51 ` Ingo Molnar
2007-12-08 8:10 ` Jiri Slaby
2007-12-08 8:39 ` Ingo Molnar
2007-12-08 9:23 ` Jiri Slaby
2007-12-08 15:24 ` Ingo Molnar
2007-12-08 17:34 ` Jiri Slaby
2007-12-08 17:43 ` Jiri Slaby
2007-12-09 8:06 ` Ingo Molnar
2007-12-08 23:12 ` Jiri Slaby
2007-12-09 7:46 ` Ingo Molnar
2007-12-09 9:09 ` Jiri Slaby
2007-12-10 8:19 ` Gautham R Shenoy
2007-12-10 8:55 ` Jiri Slaby
2007-12-10 9:10 ` Ingo Molnar
2007-12-10 10:15 ` Gautham R Shenoy
2007-12-10 10:21 ` Ingo Molnar
2007-12-10 11:08 ` Gautham R Shenoy
2007-12-10 11:28 ` Ingo Molnar
2007-12-10 11:49 ` Gautham R Shenoy
2007-12-10 9:29 ` Ingo Molnar
2007-12-07 18:20 ` [PATCH] md: balance braces in raid5 debug code Mariusz Kozlowski
2007-12-08 0:04 ` 2.6.24-rc4-mm1: undefined reference to `compat_sys_timerfd' on sparc64 Mariusz Kozlowski
2007-12-08 0:08 ` Andrew Morton
2007-12-08 9:17 ` Mariusz Kozlowski
2007-12-11 10:15 ` David Miller
2007-12-08 18:20 ` 2.6.24-rc4-mm1: some issues " Mariusz Kozlowski
2007-12-08 18:22 ` Andrew Morton
2007-12-09 8:45 ` David Miller
2007-12-09 9:03 ` Andrew Morton
2007-12-10 14:48 ` 2.6.24-rc4-mm1 Reuben Farrelly
2007-12-10 21:11 ` 2.6.24-rc4-mm1 Andrew Morton
2007-12-11 14:12 ` 2.6.24-rc4-mm1 Reuben Farrelly
2007-12-11 16:20 ` 2.6.24-rc4-mm1 Martin Bligh
2007-12-11 16:59 ` 2.6.24-rc4-mm1 Randy Dunlap
2007-12-11 17:50 ` 2.6.24-rc4-mm1 Martin Bligh
[not found] ` <33307c790712110813h23def95dvd068b7226e9fcd36@mail.gmail.com>
2007-12-11 20:37 ` 2.6.24-rc4-mm1 Andrew Morton
2007-12-11 21:20 ` 2.6.24-rc4-mm1 Ingo Molnar
2007-12-11 21:26 ` 2.6.24-rc4-mm1 Kok, Auke
2007-12-11 21:59 ` 2.6.24-rc4-mm1 Kok, Auke
2007-12-11 22:10 ` 2.6.24-rc4-mm1 Andrew Morton
2007-12-11 22:17 ` 2.6.24-rc4-mm1 Kok, Auke
2007-12-11 23:15 ` 2.6.24-rc4-mm1 Randy Dunlap
2007-12-12 4:16 ` 2.6.24-rc4-mm1 Rik van Riel
2007-12-13 17:45 ` 2.6.24-rc4-mm1 - BUG in tcp_fragment Cedric Le Goater
2007-12-13 23:00 ` Ilpo Järvinen
2007-12-14 6:52 ` Cedric Le Goater
2007-12-14 20:14 ` [PATCH net-2.6.25] Revert recent TCP work Ilpo Järvinen
2007-12-16 22:21 ` David Miller
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