And with threshold set to 0:

# GUILE_JIT_THRESHOLD=0 guile
Pre-boot error; key: misc-error, args: (#f "parent is not a exception
type ~S" (#) #f)Aborted (core dumped)

Program terminated with signal SIGABRT, Aborted.
#0 0x76acd6b6 in ?? ()
[Current thread is 1 (LWP 515)]
(gdb) thread apply all backtrace

Thread 4 (LWP 518):
#0 0x76e5f674 in __libc_do_syscall () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#1 0x76e5a99e in pthread_cond_wait@@GLIBC_2.4 () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#2 0x76e837aa in GC_wait_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#3 0x76e83ab0 in GC_help_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#4 0x76e83b26 in GC_mark_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#5 0x76e55bb0 in start_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#6 0x76b4b0ec in ?? () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt
stack?)

Thread 3 (LWP 516):
#0 0x76e5f674 in __libc_do_syscall () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#1 0x76e5a99e in pthread_cond_wait@@GLIBC_2.4 () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#2 0x76e837aa in GC_wait_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#3 0x76e83ab0 in GC_help_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#4 0x76e83b26 in GC_mark_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#5 0x76e55bb0 in start_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#6 0x76b4b0ec in ?? () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt
stack?)

Thread 2 (LWP 517):
#0 0x76e5f674 in __libc_do_syscall () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#1 0x76e5a99e in pthread_cond_wait@@GLIBC_2.4 () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#2 0x76e837aa in GC_wait_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#3 0x76e83ab0 in GC_help_marker () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#4 0x76e83b26 in GC_mark_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libgc.so.1
#5 0x76e55bb0 in start_thread () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libpthread.so.0
#6 0x76b4b0ec in ?? () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libc.so.6
Backtrace stopped: previous frame identical to this frame (corrupt
stack?)

Thread 1 (LWP 515):
#0 0x76acd6b6 in __libc_do_syscall () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libc.so.6
#1 0x76adbc70 in raise () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libc.so.6
#2 0x76adc73e in abort () from
/home/dales/br/rpi/host/arm-buildroot-linux-gnueabihf/sysroot/lib/libc.so.6
#3 0x76f45ce8 in scm_throw (key=0x76fb92b0, key@entry=0x0,
args=0x76a57360) at throw.c:264
#4 0x76f0b97e in throw_ (args=, key=0x0) at intrinsics.c:352
#5 throw_with_value (val=, key_subr_and_message=) at intrinsics.c:367
#6 0x74f473da in ?? ()
--Type  for more, q to quit, c to continue without paging--c
Backtrace stopped: previous frame identical to this frame (corrupt
stack?)
(gdb) info reg
r0 0x0 0
r1 0x7ef92688 2130257544
r2 0x0 0
r3 0x8 8
r4 0x0 0
r5 0x7ef92688 2130257544
r6 0x76a57360 1990554464
r7 0xaf 175
r8 0x75207308 1965060872
r9 0x75207208 1965060616
r10 0x4 4
r11 0x76f82000 1995972608
r12 0xaf 175
sp 0x7ef92680 0x7ef92680
lr 0x76adbc71 1991097457
pc 0x76acd6b6 0x76acd6b6 
cpsr 0x30 48
fpscr 0x0 0
(gdb) disassem /r 0x76acd6b6,+8
Dump of assembler code from 0x76acd6b6 to 0x76acd6be:
=> 0x76acd6b6 : 80 bd pop {r7, pc}
 0x76acd6b8 : 03 4b ldr r3, [pc, #12] ; (0x76acd6c8 )
 0x76acd6ba : 1d ee 70 0f mrc 15, 0, r0, cr13, cr0, {3}
End of assembler dump.
(gdb)