SEGV while running t/spec/S12-attributes/undeclared.t with MVN_SPESH_NODELAY=1

gistfile1.txt

(gdb) r
Starting program: /home/dogbert/repos/rakudo/install/bin/moar --execname=./perl6-gdb-m --libpath=. --libpath=blib --libpath=/home/dogbert/repos/rakudo/install/share/nqp/lib --libpath=/home/dogbert/repos/rakudo/install/share/nqp/lib --libpath=/home/dogbert/repos/rakudo/install/share/nqp/lib /home/dogbert/repos/rakudo/perl6.moarvm --nqp-lib=blib t/spec/S12-attributes/undeclared.t
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[New Thread 0xb7459b40 (LWP 23611)]
1..11
ok 1 - Test Undeclared public attribute assignment from a class
ok 2 - Test Undeclared public attribute assignment from a role
    1..2
    ok 1 - ' class D { method d { $!d = 1 }}; D.new.d; ' died
    ok 2 - right exception type (X::Attribute::Undeclared)
ok 3 - Test Undeclared private attribute assignment from a class
    1..2
    ok 1 - ' role E { method e { $!e = 1 }};class F does E { }; F.new.e; ' died
    ok 2 - right exception type (X::Attribute::Undeclared)
ok 4 - Test Undeclared private attribute assignment from a role
ok 5 - Test Undeclared public attribute access from a class
ok 6 - Test Undeclared public attribute access from a role
    1..2
    ok 1 - ' class K { method k { $!k }}; K.new.k; ' died
    ok 2 - right exception type (X::Attribute::Undeclared)
ok 7 - Test Undeclared private attribute access from a class
    1..2
    ok 1 - ' role L { method l { $!l }};class M does L { }; M.new.l; ' died
    ok 2 - right exception type (X::Attribute::Undeclared)
ok 8 - Test Undeclared private attribute access from a role
    1..2
    ok 1 - ' role R { method r { $!r := 1 }};class S does R { }; S.new.r; ' died
    ok 2 - right exception type (X::Attribute::Undeclared)
ok 9 - Test Undeclared private attribute binding from a role
    1..2

Program received signal SIGSEGV, Segmentation fault.
0xb7c58ede in MVM_spesh_arg_guard_run (tc=0x804c5f8, ag=0x8130c80, cs=0x81dc348, args=0xa8439c0, certain=0x0) at src/spesh/arg_guard.c:411
411	                current_node = IS_CONCRETE(test) && test->st == agn->st
(gdb) bt
#0  0xb7c58ede in MVM_spesh_arg_guard_run (tc=0x804c5f8, ag=0x8130c80, cs=0x81dc348, args=0xa8439c0, certain=0x0) at src/spesh/arg_guard.c:411
#1  0xb7bafc3d in MVM_frame_invoke (tc=0x804c5f8, static_frame=0x81ee540, callsite=0x81dc348, args=0xa8439c0, outer=0xa5efb88, code_ref=0x81f7380, spesh_cand=-1) at src/core/frame.c:473
#2  0xb7c008a9 in invoke_handler (tc=0x804c5f8, invokee=0x81f7380, callsite=0x81dc348, args=0xa8439c0) at src/6model/reprs/MVMCode.c:10
#3  0xb7b894a5 in MVM_interp_run (tc=0x804c5f8, initial_invoke=0xb7c8b7ca <toplevel_initial_invoke>, invoke_data=0x80bb7a8) at src/core/interp.c:993
#4  0xb7c8b929 in MVM_vm_run_file (instance=0x804c008, filename=0xbffff279 "/home/dogbert/repos/rakudo/perl6.moarvm") at src/moar.c:401
#5  0x08048f4f in main (argc=10, argv=0xbfffef74) at src/main.c:257
(gdb) info threads
  Id   Target Id         Frame 
  2    Thread 0xb7459b40 (LWP 23611) "moar" 0xb7c40146 in rename_locals (tc=0x808f2b0, g=0xb4f25868, var_info=0xb507d1c8, x=0xb4a8273c) at src/spesh/graph.c:1077
* 1    Thread 0xb789d700 (LWP 23609) "moar" 0xb7c58ede in MVM_spesh_arg_guard_run (tc=0x804c5f8, ag=0x8130c80, cs=0x81dc348, args=0xa8439c0, certain=0x0) at src/spesh/arg_guard.c:411
(gdb) t 2
[Switching to thread 2 (Thread 0xb7459b40 (LWP 23611))]
#0  0xb7c40146 in rename_locals (tc=0x808f2b0, g=0xb4f25868, var_info=0xb507d1c8, x=0xb4a8273c) at src/spesh/graph.c:1077
1077	                    MVMuint16 orig = a->operands[i].reg.orig;
(gdb) bt
#0  0xb7c40146 in rename_locals (tc=0x808f2b0, g=0xb4f25868, var_info=0xb507d1c8, x=0xb4a8273c) at src/spesh/graph.c:1077
#1  0xb7c4051e in rename_locals (tc=0x808f2b0, g=0xb4f25868, var_info=0xb507d1c8, x=0xb4a82708) at src/spesh/graph.c:1129
#2  0xb7c4051e in rename_locals (tc=0x808f2b0, g=0xb4f25868, var_info=0xb507d1c8, x=0xb4a826d4) at src/spesh/graph.c:1129
#3  0xb7c4051e in rename_locals (tc=0x808f2b0, g=0xb4f25868, var_info=0xb507d1c8, x=0xb4a824cc) at src/spesh/graph.c:1129
#4  0xb7c4051e in rename_locals (tc=0x808f2b0, g=0xb4f25868, var_info=0xb507d1c8, x=0xb4a82498) at src/spesh/graph.c:1129
#5  0xb7c4051e in rename_locals (tc=0x808f2b0, g=0xb4f25868, var_info=0xb507d1c8, x=0xb4a82464) at src/spesh/graph.c:1129
#6  0xb7c4051e in rename_locals (tc=0x808f2b0, g=0xb4f25868, var_info=0xb507d1c8, x=0xb4a8218c) at src/spesh/graph.c:1129
#7  0xb7c4051e in rename_locals (tc=0x808f2b0, g=0xb4f25868, var_info=0xb507d1c8, x=0xb4a81b60) at src/spesh/graph.c:1129
#8  0xb7c406d2 in ssa (tc=0x808f2b0, g=0xb4f25868) at src/spesh/graph.c:1167
#9  0xb7c4096a in MVM_spesh_graph_create (tc=0x808f2b0, sf=0x8870b98, cfg_only=0, insert_object_nulls=1) at src/spesh/graph.c:1212
#10 0xb7c420f7 in MVM_spesh_candidate_add (tc=0x808f2b0, p=0xb4f1b99c) at src/spesh/candidate.c:44
#11 0xb7c5449e in worker (tc=0x808f2b0, callsite=0xb7fd74a4 <null_args_callsite>, args=0x0) at src/spesh/worker.c:13
#12 0xb7bf9107 in invoke_handler (tc=0x808f2b0, invokee=0x8085570, callsite=0xb7fd74a4 <null_args_callsite>, args=0x0) at src/6model/reprs/MVMCFunction.c:9
#13 0xb7bb8800 in thread_initial_invoke (tc=0x808f2b0, data=0x80aff90) at src/core/threads.c:59
#14 0xb7b834fb in MVM_interp_run (tc=0x808f2b0, initial_invoke=0xb7bb8777 <thread_initial_invoke>, invoke_data=0x80aff90) at src/core/interp.c:93
#15 0xb7bb88b1 in start_thread (data=0x80aff90) at src/core/threads.c:85
#16 0xb78b3f72 in start_thread (arg=0xb7459b40) at pthread_create.c:312
#17 0xb79fe3ee in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:129
(gdb)