Fromspace error

gistfile1.txt

dogbert@dogbert-ubuntu:~/repos/rakudo/nqp/MoarVM$ git diff
diff --git a/src/gc/collect.h b/src/gc/collect.h
index b967a2bcc..fdba3ceae 100644
--- a/src/gc/collect.h
+++ b/src/gc/collect.h
@@ -1,6 +1,6 @@
 /* The maximum size of the nursery area. Note that since it's semi-space
  * copying, we could actually have double this amount allocated per thread. */
-#define MVM_NURSERY_SIZE 4194304
+#define MVM_NURSERY_SIZE 512
 
 /* The nursery size threads other than the main thread start out with. If
  * they fill it and trigger a GC run, then it is doubled. If they are
diff --git a/src/gc/debug.h b/src/gc/debug.h
index 1dd4f17bb..088bdac48 100644
--- a/src/gc/debug.h
+++ b/src/gc/debug.h
@@ -3,7 +3,7 @@
  * 1 = Checks on reference assignments and other relatively cheap cases
  * 2 = Checks on every object register access (slow)
  */
-#define MVM_GC_DEBUG 0
+#define MVM_GC_DEBUG 1
 
 #if MVM_GC_DEBUG
 #define MVM_ASSERT_NOT_FROMSPACE(tc, c) do { \

dogbert@dogbert-ubuntu:~/repos/rakudo$ ./perl6-gdb-m -Ilib t/spec/S02-literals/quoting.t
================================================================================================
This is Rakudo Perl 6 running in the  debugger, which often allows the user to generate useful back-
traces to debug or report issues in Rakudo, the MoarVM backend or the currently running code.

This Rakudo version is 2019.07.1.105.g.082.c.09.e.0.e built on MoarVM version 2019.07.1.66.g.654.a.136.d.1,
running on ubuntu (18.04.2.LTS.Bionic.Beaver) / linux (60.Ubuntu.SMP.Tue.Jul.2.18.22.20.UTC.2019)

Type `bt full` to generate a backtrace if applicable, type `q` to quit or `help` for help.
------------------------------------------------------------------------------------------------
Reading symbols from /home/dogbert/repos/rakudo/install/bin/moar...done.
Starting program: /home/dogbert/repos/rakudo/install/bin/moar --execname=/home/dogbert/repos/rakudo/perl6-gdb-m --libpath=/home/dogbert/repos/rakudo --libpath=/home/dogbert/repos/rakudo/blib --libpath= --libpath=/home/dogbert/repos/rakudo/install/share/nqp/lib /home/dogbert/repos/rakudo/perl6.moarvm --nqp-lib=/home/dogbert/repos/rakudo/blib -Ilib t/spec/S02-literals/quoting.t
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff64e0700 (LWP 211047)]
MoarVM panic: Collectable 0x5555558144c0 in fromspace accessed
[Thread 0x7ffff7fdb740 (LWP 211043) exited]
[Inferior 1 (process 211043) exited with code 01]
(gdb) b MVM_panic
Breakpoint 1 at 0x7ffff74842b6: file src/core/exceptions.c, line 832.
(gdb) r
Starting program: /home/dogbert/repos/rakudo/install/bin/moar --execname=/home/dogbert/repos/rakudo/perl6-gdb-m --libpath=/home/dogbert/repos/rakudo --libpath=/home/dogbert/repos/rakudo/blib --libpath= --libpath=/home/dogbert/repos/rakudo/install/share/nqp/lib /home/dogbert/repos/rakudo/perl6.moarvm --nqp-lib=/home/dogbert/repos/rakudo/blib -Ilib t/spec/S02-literals/quoting.t
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff64e0700 (LWP 211049)]

Thread 1 "moar" hit Breakpoint 1, MVM_panic (exitCode=1, messageFormat=0x7ffff76b0508 "Collectable %p in fromspace accessed") at src/core/exceptions.c:832
832	MVM_NO_RETURN void MVM_panic(MVMint32 exitCode, const char *messageFormat, ...) {
(gdb) bt
#0  MVM_panic (exitCode=1, messageFormat=0x7ffff76b0508 "Collectable %p in fromspace accessed") at src/core/exceptions.c:832
#1  0x00007ffff753d5e1 in set_obj_at_offset (tc=0x555555758cc0, root=0x5555558141c8, data=0x5555558141e0, offset=80, value=0x555555759000)
    at src/6model/reprs/P6opaque.c:21
#2  0x00007ffff753f2db in bind_attribute (tc=0x555555758cc0, st=0x55555a971f68, root=0x5555558141c8, data=0x5555558141e0, class_handle=0x5555557d0390, 
    name=0x5555559f2390, hint=-1, value_reg=..., kind=8) at src/6model/reprs/P6opaque.c:358
#3  0x00007ffff752b4e6 in MVM_repr_bind_attr_inso (tc=0x555555758cc0, object=0x5555558141c8, type=0x5555557d0390, name=0x5555559f2390, hint=-1, value_reg=..., kind=8)
    at src/6model/reprconv.c:738
#4  0x00007fffefb8b5cf in ?? ()
#5  0x0000000000000008 in ?? ()
#6  0x00000008f753f0cc in ?? ()
#7  0x00007fffffffc1a0 in ?? ()
#8  0x0000555558755880 in ?? ()
#9  0x0000555555758cc0 in ?? ()
#10 0x000055555869afd0 in ?? ()
#11 0x0000555558755880 in ?? ()
#12 0x00007fffffffc190 in ?? ()
#13 0x00007ffff74c093f in MVM_p6opaque_read_object (tc=0x7ffff753f0cc <bind_attribute>, o=0x55555869afd0, offset=93824997497976) at src/6model/reprs/P6opaque.h:115
#14 0x00007ffff76628fa in MVM_jit_code_enter (tc=0x555555758cc0, code=0x7ffff01720f0, cu=0x5555557e7228) at src/jit/interface.c:24
#15 0x00007ffff74b8769 in MVM_interp_run (tc=0x555555758cc0, initial_invoke=0x7ffff763f181 <toplevel_initial_invoke>, invoke_data=0x5555557f7a78)
    at src/core/interp.c:6314
#16 0x00007ffff763f2f9 in MVM_vm_run_file (instance=0x555555758260, filename=0x7fffffffe308 "/home/dogbert/repos/rakudo/perl6.moarvm") at src/moar.c:445
#17 0x000055555555581a in main (argc=10, argv=0x7fffffffde78) at src/main.c:302
(gdb)