----- Original Message -----
> From: [email protected]
> To: "Jan Stancek" <[email protected]>
> Cc: [email protected], [email protected]
> Sent: Monday, 15 April, 2013 4:17:43 PM
> Subject: Re: [LTP] [PATCH v2] sendmsg testcase for
> ded34e0fe8fe8c2d595bfa30626654e4b87621e0
>
> Hi!
> > > > reproducer for:
> > > > BUG: unable to handle kernel NULL pointer dereference at
> > > > 0000000000000250
> > > >
> > > > fixed in 3.9.0-0.rc5:
> > > > commit ded34e0fe8fe8c2d595bfa30626654e4b87621e0
> > > > Author: Paul Moore <[email protected]>
> > > > Date: Mon Mar 25 03:18:33 2013 +0000
> > > > unix: fix a race condition in unix_release()
> > > >
> > > > This reproducer should be able to trigger it easily on 4+ CPU systems
> > > > just within couple of seconds.
> > >
> > > I didn't get panic on my v3.9-rc4 system by this test case.
> >
> > I double checked if I got that -rc right, and that looks OK:
> > $ git tag --contains ded34e0fe8fe8c2d595bfa30626654e4b87621e0
> > v3.9-rc5
> > v3.9-rc6
> > v3.9-rc7
> >
> > There is a switch "-s" for how many seconds it should run. Can you try to
> > run
> > it for couple of minutes, if that makes any difference?
> >
> > If not, then I'm afraid it's not as reproducible as I thought it would be.
>
> I've tried to run it on older kernel (3.0 with SUSE patches) and had no
> luck either, the test runned for five minutes. I've even tried to
> increase the number of pairs.
>
> On what hardware, kernel (kernel config), etc. is this easily
> reproducible?
Strange is that I could reproduce it easily on any HW I tried so far.
The only setup I know about, that didn't work was single CPU KVM guest.
I know for sure, it reproduced on 3.6/3.7/3.8 on:
HP DL385 G5p, 8 CPU, Quad-Core AMD Opteron(tm) Processor 2378
Lenovo ThinkServer RD230, 4 CPU, Intel(R) Xeon(R) CPU E5607 @ 2.27GHz
SandyBridge-EP, 32 CPU, Genuine Intel(R) CPU @ 3.10GHz
I just tried 2 random systems with 3.8 and it hit it instantly:
Dell PowerEdge 1955, 4 CPU, Intel(R) Xeon(R) CPU 5160 @ 3.00GHz
Dell PowerEdge M910, 48 CPU, Intel(R) Xeon(R) CPU E7540 @ 2.00GHz
3.8 .config:
http://pastebin.com/JBkB1cJ6
# sestatus
SELinux status: enabled
SELinuxfs mount: /sys/fs/selinux
SELinux root directory: /etc/selinux
Loaded policy name: targeted
Current mode: enforcing
Mode from config file: enforcing
Policy MLS status: enabled
Policy deny_unknown status: allowed
Max kernel policy version: 28
Regards,
Jan
>
> --
> Cyril Hrubis
> [email protected]
>
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