Wandboard-Quad crashes

[Ulrich Grey]

I am running FreeBSD on a Wandboard-Quad:

FreeBSD 11.0-CURRENT #0 r274420M: Wed Nov 12 14:17:26 UTC 2014
    user at quad:/usr/local/DEVEL/obj/usr/local/DEVEL/SRC/head/sys/WANDBOARD-QUAD
arm FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032)
20140512 WARNING: WITNESS option enabled, expect reduced performance.
CPU: Cortex A9-r2 rev 10 (Cortex-A core)
 Supported features: ARM_ISA THUMB2 JAZELLE THUMBEE ARMv4 Security_Ext

If I try to compile x11/libX11 the system frequently crashes:

Fatal kernel mode data abort: 'Alignment Fault 1'
trapframe: 0xf72e0ae8
FSR=00000001, FAR=000000a7, spsr=60000013
r0 =00000004, r1 =00000000, r2 =c242b953, r3 =00000970
r4 =c847fd80, r5 =c242b953, r6 =000000a7, r7 =c7df6810
r8 =00000000, r9 =00000097, r10=00000970, r11=f72e0b68
r12=000000c0, ssp=f72e0b38, slr=c220ebf4, pc =c214fbb4

[ thread pid 23015 tid 100147 ]

Stopped at      __mtx_lock_flags+0x50:  ldr     r0, [r6]

What can I do?

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Ulrich Grey