Messages in this thread | | | Date | Wed, 6 Mar 2019 09:53:03 +0100 (CET) | From | Richard Biener <> | Subject | Kernel bug with MPX? |
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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
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