----- Original Message -----
> From: "Jan Stancek" <[email protected]>
> To: [email protected]
> Cc: [email protected]
> Sent: Monday, 15 April, 2013 6:14:27 PM
> Subject: Re: [LTP] [PATCH v2] sendmsg testcase for
> ded34e0fe8fe8c2d595bfa30626654e4b87621e0
>
>
>
>
>
> ----- 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
2 more random systems with Fedora 18 GOLD and kernel-3.6.10-4.fc18 hit it
almost instantly too:
Romley-EP CPU: Ivy Bridge-EP L-1, 40 CPU, Genuine Intel(R) CPU @ 2.10GHz
HP ProLiant BL495c G5, 4 CPU, Quad-Core AMD Opteron(tm) Processor 2347 HE
Regards,
Jan
>
> Regards,
> Jan
>
> >
> > --
> > Cyril Hrubis
> > [email protected]
> >
>
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------------------------------------------------------------------------------
Precog is a next-generation analytics platform capable of advanced
analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter
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