linux-kernel - Re: linux-next: Tree for Apr 18 [ call-trace: drm | x86 | smp

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Date:	Sat, 20 Apr 2013 02:19:52 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Davidlohr Bueso <davidlohr.bueso@...com>,
	Rik van Riel <riel@...riel.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next <linux-next@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Paul McKenney <paul.mckenney@...aro.org>,
	DRI <dri-devel@...ts.freedesktop.org>,
	Dave Airlie <airlied@...hat.com>,
	Emmanuel Benisty <benisty.e@...il.com>
Subject: Re: linux-next: Tree for Apr 18 [ call-trace: drm | x86 | smp | rcu
 related? ]

On Sat, Apr 20, 2013 at 2:06 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Sat, Apr 20, 2013 at 1:02 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>> On Fri, Apr 19, 2013 at 3:55 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>>>
>>> Davidlohr pointed to this patch (tested the triplet):
>>>
>>> ipc, sem: do not call sem_lock when bogus sma:
>>> https://lkml.org/lkml/2013/3/31/12
>>>
>>> Is that what you mean?
>>
>> Yup.
>>
>
> Davidlohr Bueso (1):
>       ipc, sem: do not call sem_lock when bogus sma
>
> Linus Torvalds (1):
>       crazy rcu double free debug hack
>
> With ***both*** patches applied I am able to build a Linux-kernel with
> 4 parallel-make-jobs again.
> David's or your patch alone are not sufficient!
>

[ Still both patches applied ]

To correct myself... The 1st run was OK.

The 2nd run shows a NULL-pointer-deref (excerpt):

[  178.490583] BUG: spinlock bad magic on CPU#1, sh/8066
[  178.490595]  lock: 0xffff88008b53ea18, .magic: 6b6b6b6b, .owner:
make/8068, .owner_cpu: 3
[  178.490599] BUG: unable to handle kernel NULL pointer dereference
at           (null)
[  178.490608] IP: [<ffffffff812bacd0>] update_queue+0x70/0x210
[  178.490610] PGD 0
[  178.490612] Oops: 0000 [#1] SMP
...

See attached full dmesg!

Hope this helps.

- Sedat -


> - Sedat -
>
>>     Linus

View attachment "dmesg_3.9.0-rc7-next20130419-12-iniza-small_BROKEN.txt" of type "text/plain" (69633 bytes)