On Sat, Apr 20, 2013 at 2:06 AM, Sedat Dilek <sedat.dilek@gmail.com> wrote:
> On Sat, Apr 20, 2013 at 1:02 AM, Linus Torvalds
> <torvalds@linux-foundation.org> wrote:
>> On Fri, Apr 19, 2013 at 3:55 PM, Sedat Dilek <sedat.dilek@gmail.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