Here's what I've seen twice now from your backtrace:
```
Thread 8 (Thread 0x7f80f7fff700 (LWP 10561)):
#0 __lll_lock_wait () at ../sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1 0x00007f8123031023 in __GI___pthread_mutex_lock (mutex=0x55a73a86d8a0) at
../nptl/pthread_mutex_lock.c:78
#2 0x000055a738528e3d in caml_mutex_lock ()
#3 0x000055a73848fd47 in camlDtools__mutexify_2152 () at dtools.ml:769
#4 0x000055a73854a3b4 in caml_start_program ()
#5 0x000055a738547da0 in caml_final_do_calls ()
#6 0x000055a738534eea in caml_gc_dispatch ()
#7 0x000055a738536136 in caml_alloc_string ()
#8 0x000055a7384abfa1 in camlBytes__sub_1234 () at bytes.ml:68
#9 0x000055a7384d0c3c in camlPrintf__k$27_1310 () at bytes.ml:73
#10 0x000055a73848fe64 in camlDtools__print_2156 () at dtools.ml:779
#11 0x000055a73848fd9c in camlDtools__mutexify_2152 () at dtools.ml:770
#12 0x000055a7383ab373 in camlSource__fun_2626 () at source.ml:354
#13 0x000055a738321760 in camlSmartcross__fun_2748 () at
operators/smartcross.ml:356
#14 0x000055a73832224d in camlSmartcross__fun_2627 () at
operators/smartcross.ml:191
```
It's a deadlock waiting on a `mutex` that is triggered during a `Gc` memory
collection. It happens during a `smartcross` transition to that makes it look
like the bug is coming from `smartcross` but it's only incidental. `smartcross`
is understandably pretty memory hungry so it's not a surprise a lot of `Gc`
cleanup will happen during its execution.
Now, I just have to look at finalise functions involving `Tutils.mutexify`
calls...
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