general protection fault on RTAI 4.0

Hello again :)

The reason I was attempting to get RTAI 5.0 test1 working is because I 
ran into a problem using RTAI 4.0 on one particular CPU/motherboard and 
I'm having a really hard time figuring out what the problem is. Here is 
what I'm seeing with RTAI 4.0 on a 3.8.13 kernel which I've been 
successfully using on other systems for months. I attached my kernel 
config and rtai config.  Here is what I get when I try to run the 
latency test:

Mar 18 03:55:45 localhost kernel: [   91.508079]
Mar 18 03:55:45 localhost kernel: [   91.508079] LXRT CHANGED MODE 
(TRAP), PID = 1021, VEC = 13, SIGNO = 11.
Mar 18 03:55:45 localhost kernel: [   91.508101] general protection 
fault: 0000 [#1] PREEMPT SMP
Mar 18 03:55:45 localhost kernel: [   91.508157] Modules linked in: 
rtai_msg(OF) rtai_mbx(OF) rtai_sem(OF) rtai_sched(OF) rtai_malloc(POF) 
rtai_hal(OF) snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep 
snd_seq snd_seq_device snd_pcm e1000e iTCO_wdt iTCO_vendor_support 
snd_page_alloc snd_timer snd mei tpm_tis tpm coretemp crc32c_intel 
ghash_clmulni_intel microcode nfsd tpm_bios pcspkr i2c_i801 lpc_ich 
shpchp mfd_core soundcore auth_rpcgss nfs_acl lockd sunrpc i915 
i2c_algo_bit drm_kms_helper drm video
Mar 18 03:55:45 localhost kernel: [   91.508339] CPU 0
Mar 18 03:55:45 localhost kernel: [   91.508348] Pid: 1021, comm: 
latency Tainted: PF          O 3.8.13-ds #6                  /DQ77MK
Mar 18 03:55:45 localhost kernel: [   91.508374] RIP: 
0010:[<ffffffff8102b43b>]  [<ffffffff8102b43b>] 
native_apic_msr_write+0x2b/0x30
Mar 18 03:55:45 localhost kernel: [   91.508404] RSP: 
0018:ffff88006aeabde8  EFLAGS: 00010246
Mar 18 03:55:45 localhost kernel: [   91.508420] RAX: 0000000002000000 
RBX: 0000000000000001 RCX: 0000000000000831
Mar 18 03:55:45 localhost kernel: [   91.508440] RDX: 0000000000000000 
RSI: 0000000002000000 RDI: 0000000000000031
Mar 18 03:55:45 localhost kernel: [   91.508460] RBP: ffff88006aeabde8 
R08: 0000000000000001 R09: 0000000000000045
Mar 18 03:55:45 localhost kernel: [   91.508481] R10: ffffffffa02b8d90 
R11: 0000000000003246 R12: 0000000000000201
Mar 18 03:55:45 localhost kernel: [   91.508501] R13: 0000000000051820 
R14: ffffffffa02c4450 R15: fffffffffffffa1e
Mar 18 03:55:45 localhost kernel: [   91.508522] FS: 
00007f5613b34740(0000) GS:ffff880100200000(0000) knlGS:0000000000000000
Mar 18 03:55:45 localhost kernel: [   91.508545] CS:  0010 DS: 0000 ES: 
0000 CR0: 0000000080050033
Mar 18 03:55:45 localhost kernel: [   91.508562] CR2: 000000000042fad0 
CR3: 000000006ae66000 CR4: 00000000001407f0
Mar 18 03:55:45 localhost kernel: [   91.508582] DR0: 0000000000000000 
DR1: 0000000000000000 DR2: 0000000000000000
Mar 18 03:55:45 localhost kernel: [   91.508603] DR3: 0000000000000000 
DR6: 00000000ffff0ff0 DR7: 0000000000000400
Mar 18 03:55:45 localhost kernel: [   91.508623] I-pipe domain Linux
Mar 18 03:55:45 localhost kernel: [   91.508633] Process latency (pid: 
1021, threadinfo ffff88006aea8000, task ffff88006b3d9770)
Mar 18 03:55:45 localhost kernel: [   91.508657] Stack:
Mar 18 03:55:45 localhost kernel: [   91.508664]  ffff88006aeabe18 
ffffffffa02c3876 00007fff3e178bc0 0000000000051820
Mar 18 03:55:45 localhost kernel: [   91.508690]  ffffc900046a1230 
00007fff3e178bc0 ffff88006aeabe58 ffffffffa02c45a1
Mar 18 03:55:45 localhost kernel: [   91.508716]  00007fff3e178b90 
00007fff3e178bb8 0000000000000200 000000000000004b
Mar 18 03:55:45 localhost kernel: [   91.508742] Call Trace:
Mar 18 03:55:45 localhost kernel: [   91.508754] [<ffffffffa02c3876>] 
mbx_signal.isra.4+0x1f6/0x290 [rtai_mbx]
Mar 18 03:55:45 localhost kernel: [   91.508775] [<ffffffffa02c45a1>] 
_rt_mbx_send_if+0x151/0x1f0 [rtai_mbx]
Mar 18 03:55:45 localhost kernel: [   91.508798] [<ffffffffa02ad6a8>] 
rtai_lxrt_invoke+0x108/0x1160 [rtai_sched]
Mar 18 03:55:45 localhost kernel: [   91.508821] [<ffffffffa02acb95>] 
lxrt_intercept_syscall+0x95/0x130 [rtai_sched]
Mar 18 03:55:45 localhost kernel: [   91.508844] [<ffffffff810e01d8>] 
__ipipe_notify_kevent+0x18/0x20
Mar 18 03:55:45 localhost kernel: [   91.508863] [<ffffffff8102585a>] 
__ipipe_syscall_root+0x3a/0xe0
Mar 18 03:55:45 localhost kernel: [   91.508883] [<ffffffff812deada>] 
__ipipe_syscall_root_thunk+0x35/0x67
Mar 18 03:55:45 localhost kernel: [   91.508904] [<ffffffff815c7327>] ? 
system_call_after_swapgs+0x54/0x6d
Mar 18 03:55:45 localhost kernel: [   91.508923] Code: 55 81 ff e0 00 00 
00 48 89 e5 74 21 89 f8 83 e0 ef 83 f8 20 74 17 81 ff d0 00 00 00 74 0f 
c1 ef 04 31 d2 89 f0 8d 8f 00 08 00 00 <0f> 30 5d c3 90 55 81 ff e0 00 
00 00 b8 ff ff ff ff 48 89 e5 74
Mar 18 03:55:45 localhost kernel: [   91.509073] RIP 
[<ffffffff8102b43b>] native_apic_msr_write+0x2b/0x30
Mar 18 03:55:45 localhost kernel: [   91.509094]  RSP <ffff88006aeabde8>
Mar 18 03:55:45 localhost kernel: [   91.530153] ---[ end trace 
4ad3f2f6dc4cb6a7 ]---
Mar 18 03:55:45 localhost kernel:
LXRT CHANGED MODE (TRAP), PID = 1021, VEC = 13, SIGNO = 11.
Mar 18 03:55:45 localhost kernel: [   91.531685] LXRT releases PID 1021 
(ID: latency).
Mar 18 03:55:45 localhost kernel: general protection fault: 0000 [#1] 
PREEMPT SMP
Mar 18 03:55:45 localhost kernel: Modules linked in: rtai_msg(OF) 
rtai_mbx(OF) rtai_sem(OF) rtai_sched(OF) rtai_malloc(POF) rtai_hal(OF) 
snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq 
snd_seq_device snd_pcm e1000e iTCO_wdt iTCO_vendor_support 
snd_page_alloc snd_timer snd mei tpm_tis tpm coretemp crc32c_intel 
ghash_clmulni_intel microcode nfsd tpm_bios pcspkr i2c_i801 lpc_ich 
shpchp mfd_core soundcore auth_rpcgss nfs_acl lockd sunrpc i915 
i2c_algo_bit drm_kms_helper drm video

================================================================================


Some of the CPUs we use are 4 cores but have 2 disabled so we can 
maintain backward compatibility and this is from /proc/cpuinfo:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 58
model name      : Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
stepping        : 9
microcode       : 0x1b
cpu MHz         : 3192.803
cache size      : 6144 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe 
syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl 
xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx 
smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt 
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm arat epb xsaveopt 
pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms
bogomips        : 6385.60
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 58
model name      : Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
stepping        : 9
microcode       : 0x1b
cpu MHz         : 3192.803
cache size      : 6144 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
apicid          : 2
initial apicid  : 2
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe 
syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl 
xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx 
smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt 
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm arat epb xsaveopt 
pln pts dtherm tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms
bogomips        : 6385.60
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:
=======================================================================================

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#
# Automatically generated make config: don't edit
#
CONFIG_MODULES=y
CONFIG_RTAI_VERSION="4.0 (vulcano)"

#
# General
#
CONFIG_RTAI_INSTALLDIR="/usr/realtime-4.0"
CONFIG_RTAI_LINUXDIR="/usr/src/kernels/linux"

#
# RTAI Documentation
#
# CONFIG_RTAI_DOX_DOC is not set
# CONFIG_RTAI_DOC_LATEX_NONSTOP is not set
# CONFIG_RTAI_DBX_DOC is not set
CONFIG_RTAI_TESTSUITE=y
# CONFIG_RTAI_COMPAT is not set
# CONFIG_RTAI_EXTENDED is not set
# CONFIG_RTAI_LXRT_NO_INLINE is not set
CONFIG_RTAI_LXRT_STATIC_INLINE=y

#
# Machine (x86)
#
CONFIG_RTAI_FPU_SUPPORT=y
CONFIG_RTAI_CPUS="2"
# CONFIG_RTAI_DIAG_TSC_SYNC is not set

#
# Base system
#

#
# Scheduling options
#
# CONFIG_RTAI_SCHED_ISR_LOCK is not set
# CONFIG_RTAI_LONG_TIMED_LIST is not set
CONFIG_RTAI_SCHED_8254_LATENCY="4700"
CONFIG_RTAI_SCHED_APIC_LATENCY="3944"
# CONFIG_RTAI_BUSY_TIME_ALIGN is not set
CONFIG_RTAI_SCHED_LXRT_NUMSLOTS="150"
CONFIG_RTAI_MONITOR_EXECTIME=y
CONFIG_RTAI_ALLOW_RR=y
# CONFIG_RTAI_FULL_PRINHER is not set
# CONFIG_RTAI_ALIGN_LINUX_PRIORITY is not set
# CONFIG_RTAI_ONE_SHOT is not set
CONFIG_RTAI_CAL_FREQS_FACT="0"

#
# Supported services
#
CONFIG_RTAI_BITS=m
CONFIG_RTAI_FIFOS=m
CONFIG_RTAI_NETRPC=m
# CONFIG_RTAI_NETRPC_RTNET is not set
CONFIG_RTAI_SHM=m
CONFIG_RTAI_SEM=m
# CONFIG_RTAI_RT_POLL is not set
CONFIG_RTAI_MSG=m
CONFIG_RTAI_MBX=m
CONFIG_RTAI_TBX=m
CONFIG_RTAI_TASKLETS=m
CONFIG_RTAI_MQ=m
# CONFIG_RTAI_CLOCK_REALTIME is not set

#
# Other features
#
# CONFIG_RTAI_USE_NEWERR is not set
# CONFIG_RTAI_MATH is not set
CONFIG_RTAI_MALLOC=m
# CONFIG_RTAI_USE_TLSF is not set
CONFIG_RTAI_MALLOC_VMALLOC=y
CONFIG_RTAI_MALLOC_HEAPSZ="2048"
CONFIG_RTAI_KSTACK_HEAPSZ="512"
# CONFIG_RTAI_TASK_SWITCH_SIGNAL is not set
# CONFIG_RTAI_USI is not set
CONFIG_RTAI_WD=y
# CONFIG_RTAI_HARD_SOFT_TOGGLER is not set

#
# Add-ons
#
# CONFIG_RTAI_COMEDI_LXRT is not set
# CONFIG_RTAI_CPLUSPLUS is not set
# CONFIG_RTAI_RTDM is not set

#
# Drivers
#
CONFIG_RTAI_DRIVERS_SERIAL=y

#
# RTAI Lab
#
# CONFIG_RTAI_LAB is not set