From: Richard Biener <rguenther@suse.de>
To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, dave.hansen@intel.com
Cc: mhocko@suse.com
Subject: Kernel bug with MPX?
Date: Wed, 6 Mar 2019 09:53:03 +0100 (CET) [thread overview]
Message-ID: <alpine.LSU.2.20.1903060944550.7898@zhemvz.fhfr.qr> (raw)
Hi,
I've reported this internally but got directed here, hopefully
the correct forum for bugreporting.
When running the gcc.target/i386/mpx/memmove-1.c testcase
from the GCC 8 branch on MPX capable hardware the testcase
faults and the kernel log reports the following:
[1216548.787494] BUG: Bad rss-counter state mm:0000000017ce560b idx:0
val:385
[1216548.787498] BUG: Bad rss-counter state mm:0000000017ce560b idx:1
val:551
[1216548.787500] BUG: non-zero pgtables_bytes on freeing mm: 24576
This is on a 4.20.7 kernel but it was reproduced it with 5.0 as well.
I believe it was fine on earlier kernels though.
I've put a statically linked executable at
http://www.suse.de/~rguenther/memmove-1.exe (needs some time to sync
to the public webserver still).
Thanks,
Richard.
--
Richard Biener <rguenther@suse.de>
SUSE LINUX GmbH, GF: Felix Imendoerffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nuernberg)
---------- Forwarded message ----------
Date: Tue, 5 Mar 2019 15:22:22 +0100
From: Michal Hocko <mhocko@suse.com>
To: Richard Biener <rguenther@suse.de>
Cc: suse-labs@suse.de
Subject: Re: [suse-labs] Kernel bug with MPX?
On Mon 04-03-19 14:12:07, Richard Guenther wrote:
>
> I have a MPX testcase (GCC mpx testsuite) that triggers
>
> [1216548.787494] BUG: Bad rss-counter state mm:0000000017ce560b idx:0
> val:385
> [1216548.787498] BUG: Bad rss-counter state mm:0000000017ce560b idx:1
> val:551
> [1216548.787500] BUG: non-zero pgtables_bytes on freeing mm: 24576
>
> on Tumbleweed from a few weeks ago
That looks like both file and anonymous mappings do not get torn down
properly and some memory leaks.
> > uname -a
> Linux e23 4.20.7-1-default #1 SMP PREEMPT Thu Feb 7 07:16:45 UTC 2019
> (730812f) x86_64 x86_64 x86_64 GNU/Linux
>
> does this ring any bell?
Not really but I haven't been following MPX development closely. I
can reproduce the issue on 5.0 kernel
BUG: Bad rss-counter state mm:00000000406bd30e idx:1 val:25591
so I guess it would be best to report upstream (Cc linux-mm@kvack.org,
linux-kernel@vger.kernel.org and dave.hansen@intel.com). Let me know if
you need any help.
--
Michal Hocko
SUSE Labs
next reply other threads:[~2019-03-06 8:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-06 8:53 Richard Biener [this message]
2019-03-07 20:38 ` Kernel bug with MPX? Dave Hansen
2019-03-08 7:12 ` Michal Hocko
2019-03-08 7:41 ` Michal Hocko
2019-03-13 22:00 ` Dave Hansen
2019-03-14 16:51 ` Dave Hansen
2019-03-18 11:47 ` Michal Hocko
2019-03-18 15:59 ` Dave Hansen
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