make kernel build fails

uname -a
FreeBSD  10.0-CURRENT FreeBSD 10.0-CURRENT #4: Fri Apr 20 11:58:36 UTC
2012     root_at_:/usr/obj/usr/src/sys/GENERIC  amd64

when trying a make kernel it errors out with

<jemalloc>: /usr/src/lib/libc/../../contrib/jemalloc/include/jemalloc/internal/arena.h:650:
Failed assertion: "((uintptr_t)ptr - ((uintptr_t)run +
(uintptr_t)bin_info->reg0_offset)) % bin_info->reg_interval == 0"
*** [kernel.debug] Signal 6

or


uest.o scif_sas_task_request_state_handlers.o
scif_sas_task_request_states.o scif_sas_timer.o syscons_isa.o
vga_isa.o kern_clocksource.o link_elf_obj.o ia32_reg.o  ia32_signal.o
ia32_sigtramp.o ia32_syscall.o ia32_misc.o  freebsd32_ioctl.o
freebsd32_misc.o freebsd32_syscalls.o  freebsd32_sysent.o
ia32_sysvec.o imgact_elf32.o memmove.o  memset.o x86bios.o x86emu.o
OsdEnvironment.o acpi_apm.o madt.o  srat.o powernow.o est.o hwpstate.o
p4tcc.o atrtc.o clock.o isa.o  isa_dma.o nmi.o orm.o pci_bus.o qpi.o
busdma_machdep.o  dump_machdep.o intr_machdep.o io_apic.o legacy.o
local_apic.o  mca.o msi.o nexus.o tsc.o config.o env.o hints.o
vnode_if.o hack.So vers.o
*** [kernel.debug] Signal 10

Stop in /usr/obj/usr/src/sys/GENERIC.
*** [buildkernel] Error code 1

Stop in /usr/src.
*** [buildkernel] Error code 1

Stop in /usr/src.