Re: segmentation fault in numa_node_to_cpus_v1

From: Cliff Wickman <cpw@sgi.com>
To: Michael Spiegel <michael.m.spiegel@gmail.com>
Cc: linux-numa@vger.kernel.org
Subject: Re: segmentation fault in numa_node_to_cpus_v1
Date: Mon, 1 Nov 2010 17:59:42 -0500	[thread overview]
Message-ID: <20101101225942.GA21509@sgi.com> (raw)
In-Reply-To: <AANLkTi==WBS+fyA116jOjvZTdfYE8=o0EssGymfcXfFz@mail.gmail.com>

On Mon, Nov 01, 2010 at 03:52:59PM -0400, Michael Spiegel wrote:
> Hi,
> 
> I'm trying to run the HotSpot Java VM on an SGI UV 1000 with 4096
> cores.  When I enable the NUMA-aware garbage collection algorithm, I
> get a segmentation fault as the virtual machine is initializing.  The
> sigsegv is occurring at one of the memcpy's in numa_node_to_cpus_v1,
> although I'm afraid I can't determine whether libnuma is being called
> correctly or incorrectly.  I am testing on a system that has numactl
> 2.0.5.
> 
> Thanks,
> --Michael

Hi Michael,

  I see that Scott Lundal gave you a possible fix.
  There were some important corrections added to the latest version, so
  if you could try building numactl/libnuma from numactl-2.0.6-rc3.tar.gz 
  that would be an interesting test.
  (ftp://oss.sgi.com/www/projects/libnuma/download/)
> 
> #6  <signal handler called>
> #7  0x00007f4066fb9ad0 in memcpy () from /lib64/libc.so.6
> #8  0x00007f40658d4c6a in numa_node_to_cpus_v1 (node=132, buffer=0x40112d40,
>    bufferlen=<value optimized out>) at libnuma.c:1203
> #9  0x00007f4066a85255 in os::Linux::rebuild_cpu_to_node_map() ()
>   from /usr/ue/0/mspiegel/jdk1.6.0_22/jre/lib/amd64/server/libjvm.so
> #10 0x00007f4066a8502f in os::Linux::libnuma_init() ()
>   from /usr/ue/0/mspiegel/jdk1.6.0_22/jre/lib/amd64/server/libjvm.so
> #11 0x00007f4066a86c38 in os::init_2() ()
>   from /usr/ue/0/mspiegel/jdk1.6.0_22/jre/lib/amd64/server/libjvm.so
> #12 0x00007f4066b81c4d in Threads::create_vm(JavaVMInitArgs*, bool*) ()
>   from /usr/ue/0/mspiegel/jdk1.6.0_22/jre/lib/amd64/server/libjvm.so
> --
> To unsubscribe from this list: send the line "unsubscribe linux-numa" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

-- 
Cliff Wickman
SGI
cpw@sgi.com
(651) 683-3824