GC related panic

gistfile1.txt

ok 19 - found π
# Completion: bare word
ok 20 - found τ
# Completion: bare word
ok 21 - found ∞
1..21

Thread 1 "rakudo-m" hit Breakpoint 2, __GI__exit (status=status@entry=0) at ../sysdeps/unix/sysv/linux/_exit.c:27
27	../sysdeps/unix/sysv/linux/_exit.c: No such file or directory.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff71f6700 (LWP 21121)]
[New Thread 0x7ffff5ae9700 (LWP 21122)]
[New Thread 0x7ffff52e6700 (LWP 21123)]

Thread 1 "rakudo-m" hit Breakpoint 1, MVM_panic (exitCode=0, messageFormat=0x0) at src/core/exceptions.c:853
853	MVM_NO_RETURN void MVM_panic(MVMint32 exitCode, const char *messageFormat, ...) {
(gdb) bt
#0  MVM_panic (exitCode=0, messageFormat=0x0) at src/core/exceptions.c:853
#1  0x00007ffff7929b86 in MVM_serialization_finish_deserialize_method_cache (tc=0x55555555a1a0, st=0x555555ab6f00) at src/6model/serialization.c:3174
#2  0x00007ffff7912b9d in get_method_cache (tc=0x55555555a1a0, st=0x555555ab6f00) at src/6model/6model.c:20
#3  0x00007ffff79133bf in MVM_6model_find_method (tc=0x55555555a1a0, obj=0x555555ac39a0, name=0x555555b7f9d0, res=0x555557ed0608, throw_if_not_found=1) at src/6model/6model.c:111
#4  0x00007ffff780cb60 in MVM_interp_run (tc=0x55555555a1a0, initial_invoke=0x7ffff79c43b6 <toplevel_initial_invoke>, invoke_data=0x5555555bdcc8, outer_runloop=0x0) at src/core/interp.c:1885
#5  0x00007ffff79c453c in MVM_vm_run_file (instance=0x555555559660, filename=0x5555555595e0 "/home/dogbert/.rakudobrew/versions/moar-master/install/share/perl6/runtime/perl6.moarvm") at src/moar.c:504
#6  0x00005555555558e8 in main ()
(gdb) f 1
#1  0x00007ffff7929b86 in MVM_serialization_finish_deserialize_method_cache (tc=0x55555555a1a0, st=0x555555ab6f00) at src/6model/serialization.c:3174
3174	            MVM_ASSIGN_REF(tc, &(st->header), st->method_cache, cache);
(gdb) l
3169	
3170	            /* Deserialize what we need. */
3171	            cache = MVM_serialization_read_ref(tc, sr);
3172	            if (sr->working == 1)
3173	                work_loop(tc, sr);
3174	            MVM_ASSIGN_REF(tc, &(st->header), st->method_cache, cache);
3175	
3176	            /* Clear up. */
3177	            MVM_gc_allocate_gen2_default_clear(tc);
3178	            sr->working--;
(gdb) info threads
  Id   Target Id                                           Frame 
* 1    Thread 0x7ffff727c440 (LWP 21120) "rakudo-m"        0x00007ffff7929b86 in MVM_serialization_finish_deserialize_method_cache (tc=0x55555555a1a0, st=0x555555ab6f00) at src/6model/serialization.c:3174
  2    Thread 0x7ffff71f6700 (LWP 21121) "spesh optimizer" futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x5555555ab118) at ../sysdeps/nptl/futex-internal.h:183
  3    Thread 0x7ffff5ae9700 (LWP 21122) "rakudo-m"        futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x555555559744) at ../sysdeps/nptl/futex-internal.h:183
  4    Thread 0x7ffff52e6700 (LWP 21123) "rakudo-m"        0x00007ffff74d53bf in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=0x7ffff52e4500, rem=0x7ffff52e4500) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:78
(gdb) 



----- changes in MoarVM in order to repro
dogbert@dogbert-VirtualBox:~/.rakudobrew/versions/moar-master/nqp/MoarVM$ git diff
diff --git a/src/core/fixedsizealloc.c b/src/core/fixedsizealloc.c
index cea39f925..a1faa0054 100644
--- a/src/core/fixedsizealloc.c
+++ b/src/core/fixedsizealloc.c
@@ -10,7 +10,7 @@
  * behavior. */
 
 /* Turn this on to switch to a mode where we debug by size. */
-#define FSA_SIZE_DEBUG 0
+#define FSA_SIZE_DEBUG 1
 #if FSA_SIZE_DEBUG
 typedef struct {
     size_t alloc_size;
diff --git a/src/gc/collect.h b/src/gc/collect.h
index 153805096..9b3385e1b 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 (65536 * 2)
 
 /* 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 91d833abd..20735652d 100644
--- a/src/gc/debug.h
+++ b/src/gc/debug.h
@@ -4,7 +4,7 @@
  * 2 = Checks on every object register access (slow)
  * 3 = Collects garbage on every allocation
  */
-#define MVM_GC_DEBUG 0
+#define MVM_GC_DEBUG 1
 
 #if MVM_GC_DEBUG
 #define MVM_ASSERT_NOT_FROMSPACE(tc, c) do { \
diff --git a/src/gc/roots.h b/src/gc/roots.h
index 39366bd23..314663268 100644
--- a/src/gc/roots.h
+++ b/src/gc/roots.h
@@ -1,5 +1,5 @@
 /* Set this flag to debug temporary root pushes/pops. */
-#define MVM_TEMP_ROOT_DEBUG 0
+#define MVM_TEMP_ROOT_DEBUG 1
 
 /* The number of temp roots we start out with per thread (and so can rely on
  * always having). */
diff --git a/src/moar.h b/src/moar.h
index 7d9c445b6..8de4193a8 100644
--- a/src/moar.h
+++ b/src/moar.h
@@ -98,7 +98,7 @@ typedef double   MVMnum64;
 #endif
 
 /* Hashes */
-#define HASH_DEBUG_ITER 0
+#define HASH_DEBUG_ITER 1
 #define MVM_HASH_RANDOMIZE 1
 #define MVM_HASH_MAX_PROBE_DISTANCE 255
 #define MVM_HASH_INITIAL_BITS_IN_METADATA 5
diff --git a/src/spesh/usages.h b/src/spesh/usages.h
index 499a55d1f..af94d21ff 100644
--- a/src/spesh/usages.h
+++ b/src/spesh/usages.h
@@ -1,5 +1,5 @@
 /* Option to enable checking of define/use chains for debugging purposes. */
-#define MVM_SPESH_CHECK_DU 0
+#define MVM_SPESH_CHECK_DU 1
 
 /* Usage information, which is held per SSA written register. */
 struct MVMSpeshUsages {