From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Spiegel <michael.m.spiegel@gmail.com>
Subject: Re: segmentation fault in numa_node_to_cpus_v1
Date: Mon, 1 Nov 2010 21:10:13 -0400
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	<20101101225942.GA21509@sgi.com>
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To: linux-numa@vger.kernel.org

Hi everyone,

I tried the suggestions from Cliff and Scott, with no change in
behavior.  I tried some primitive debugging and noticed that
NUMA_NUM_NODES was 128 and the node argument to numa_node_to_cpus_v1
was 132.  When I changed the definition of NUMA_NUM_NODES in numa.h to
2048, I can eliminate the segmentation fault.  Now I'm getting "mbind:
invalid argument" errors.

Thanks,
--Michael

On Mon, Nov 1, 2010 at 6:59 PM, Cliff Wickman <cpw@sgi.com> wrote:
> 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. =A0When I enable the NUMA-aware garbage collection algorithm,=
 I
>> get a segmentation fault as the virtual machine is initializing. =A0=
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 calle=
d
>> correctly or incorrectly. =A0I am testing on a system that has numac=
tl
>> 2.0.5.
>>
>> Thanks,
>> --Michael
>
> Hi Michael,
>
> =A0I see that Scott Lundal gave you a possible fix.
> =A0There were some important corrections added to the latest version,=
 so
> =A0if you could try building numactl/libnuma from numactl-2.0.6-rc3.t=
ar.gz
> =A0that would be an interesting test.
> =A0(ftp://oss.sgi.com/www/projects/libnuma/download/)
>>
>> #6 =A0<signal handler called>
>> #7 =A00x00007f4066fb9ad0 in memcpy () from /lib64/libc.so.6
>> #8 =A00x00007f40658d4c6a in numa_node_to_cpus_v1 (node=3D132, buffer=
=3D0x40112d40,
>> =A0 =A0bufferlen=3D<value optimized out>) at libnuma.c:1203
>> #9 =A00x00007f4066a85255 in os::Linux::rebuild_cpu_to_node_map() ()
>> =A0 from /usr/ue/0/mspiegel/jdk1.6.0_22/jre/lib/amd64/server/libjvm.=
so
>> #10 0x00007f4066a8502f in os::Linux::libnuma_init() ()
>> =A0 from /usr/ue/0/mspiegel/jdk1.6.0_22/jre/lib/amd64/server/libjvm.=
so
>> #11 0x00007f4066a86c38 in os::init_2() ()
>> =A0 from /usr/ue/0/mspiegel/jdk1.6.0_22/jre/lib/amd64/server/libjvm.=
so
>> #12 0x00007f4066b81c4d in Threads::create_vm(JavaVMInitArgs*, bool*)=
 ()
>> =A0 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 =A0http://vger.kernel.org/majordomo-info.html
>
> --
> Cliff Wickman
> SGI
> cpw@sgi.com
> (651) 683-3824
>