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Bug: https://bugs.gentoo.org/show_bug.cgi?id=561780
fix crash on register stack mark/sweep pass
The crash looks like
Program received signal SIGSEGV, Segmentation fault.
mark_locations_array (objspace=0x6000000000045db0, x=0x0, n=864692227966763116) at gc.c:3297
3297 v = *x;
(gdb) bt
#0 mark_locations_array (objspace=0x6000000000045db0, x=0x0, n=864692227966763116) at gc.c:3297
#1 0x400000000014a040 in gc_mark_locations (objspace=0x6000000000045db0, start=0x0, end=0x6000080000000368) at gc.c:3310
#2 0x400000000014b3a0 in mark_current_machine_context (objspace=0x6000000000045db0, th=0x60000000000455b0) at gc.c:3500
#3 0x400000000014dfe0 in gc_mark_roots (objspace=0x6000000000045db0, full_mark=0, categoryp=0x0) at gc.c:4105
#4 0x400000000014e6b0 in gc_marks_body (objspace=0x6000000000045db0, full_mark=0) at gc.c:4164
#5 0x400000000014f260 in gc_marks (objspace=0x6000000000045db0, full_mark=0) at gc.c:4526
#6 0x40000000001525c0 in garbage_collect_body (objspace=0x6000000000045db0, full_mark=0, immediate_sweep=0, reason=256) at gc.c:5024
#7 0x400000000013c010 in heap_prepare_freepage (objspace=0x6000000000045db0, heap=0x6000000000045dc0) at gc.c:1219
#8 0x400000000013c140 in heap_get_freeobj_from_next_freepage (objspace=0x6000000000045db0, heap=0x6000000000045dc0) at gc.c:1237
#9 0x400000000013c360 in heap_get_freeobj (objspace=0x6000000000045db0, heap=0x6000000000045dc0) at gc.c:1259
#10 0x400000000013c950 in newobj_of (klass=0, flags=40, v1=0, v2=0, v3=0) at gc.c:1303
#11 0x400000000013ccc0 in rb_newobj_of (klass=0, flags=40) at gc.c:1356
#12 0x4000000000163740 in hash_alloc (klass=0) at hash.c:289
#13 0x4000000000163860 in rb_hash_new () at hash.c:309
#14 0x400000000050e420 in Init_BareVM () at vm.c:2822
#15 0x40000000000f6b60 in ruby_setup () at eval.c:54
#16 0x40000000000f6f50 in ruby_init () at eval.c:75
#17 0x400000000001b010 in main (argc=9, argv=0x60000fffffffb1d8) at main.c:35
The problem here is in call
gc_mark_locations (objspace=0x6000000000045db0, start=0x0, end=0x6000080000000368) at gc.c:3310
where 'start' (native_main_thread.register_stack_start)
is supposed to be stack start but it's not initialized.
The initialization of 'native_main_thread.register_stack_start'
is supposed to be done in 'ruby_init_stack()'.
But code under 'MAINSTACKADDR_AVAILABLE' exits early.
The fix is to move 'register_stack_start' earlier.
diff --git a/thread_pthread.c b/thread_pthread.c
index c8a7a16..9ad448b 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -722,2 +722,8 @@ ruby_init_stack(volatile VALUE *addr
native_main_thread.id = pthread_self();
+#ifdef __ia64
+ if (!native_main_thread.register_stack_start ||
+ (VALUE*)bsp < native_main_thread.register_stack_start) {
+ native_main_thread.register_stack_start = (VALUE*)bsp;
+ }
+#endif
#if MAINSTACKADDR_AVAILABLE
@@ -745,8 +751,2 @@ ruby_init_stack(volatile VALUE *addr
#endif
-#ifdef __ia64
- if (!native_main_thread.register_stack_start ||
- (VALUE*)bsp < native_main_thread.register_stack_start) {
- native_main_thread.register_stack_start = (VALUE*)bsp;
- }
-#endif
{
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