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@xxxxxxx> 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@xxxxxxxx> To: Richard Biener <rguenther@xxxxxxx> Cc: suse-labs@xxxxxxx 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@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx and dave.hansen@xxxxxxxxx). Let me know if you need any help. -- Michal Hocko SUSE Labs
