From: Ryan Davis <ryand-ruby@...>
Date: 2010-03-23T19:11:15+09:00
Subject: [ruby-core:28884] null dereference in 1.8.7

This was reported in IRC, but I haven't seen it here so I'm sending it in just in case.

---

506 % gdb --args ~/.multiruby/install/1.8.7-p174/bin/ruby -e 'Time.now while true'
(gdb) r
Starting program: /Users/ryan/.multiruby/install/1.8.7-p174/bin/ruby -e Time.now\ while\ true
Reading symbols for shared libraries +++... done

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000008
rb_newobj () at gc.c:439
439	    freelist = freelist->as.free.next;
(gdb) bt
#0  rb_newobj () at gc.c:439
#1  0x000000010003c19d in rb_data_object_alloc (klass=4296737920, datap=0x1002bd250, dmark=0, dfree=0x100093b60 <time_free>) at gc.c:455
#2  0x00000001000945b3 in time_s_alloc (klass=4296737920) at time.c:54
#3  0x0000000100028140 in rb_call0 (klass=4296737880, recv=4296737920, id=1, oid=1, argc=0, argv=0x0, body=0x1001b0408, flags=<value temporarily unavailable, due to optimizations>) at eval.c:5917
#4  0x000000010002847b in rb_call (klass=4296737880, recv=4296737920, mid=1, argc=0, argv=0x0, scope=1, self=6) at eval.c:6164
#5  0x0000000100028a9a in vafuncall (recv=4296737920, mid=1, n=<value temporarily unavailable, due to optimizations>, ar=<value temporarily unavailable, due to optimizations>) at eval.c:6241
#6  0x0000000100028d26 in rb_funcall (recv=<value temporarily unavailable, due to optimizations>, mid=<value temporarily unavailable, due to optimizations>, n=<value temporarily unavailable, due to optimizations>) at eval.c:6258
#7  0x0000000100052670 in rb_obj_alloc (klass=4296737920) at object.c:1606
#8  0x0000000100052f42 in rb_class_new_instance (argc=0, argv=0x0, klass=<value temporarily unavailable, due to optimizations>) at object.c:1643
#9  0x0000000100028140 in rb_call0 (klass=4296737880, recv=4296737920, id=8753, oid=8753, argc=0, argv=0x0, body=0x1001b03b8, flags=<value temporarily unavailable, due to optimizations>) at eval.c:5917
#10 0x000000010002847b in rb_call (klass=4296737880, recv=4296737920, mid=8753, argc=0, argv=0x0, scope=0, self=4296835720) at eval.c:6164
#11 0x000000010002185b in rb_eval (self=4296835720, n=<value temporarily unavailable, due to optimizations>) at eval.c:3503
#12 0x000000010002268b in rb_eval (self=<value temporarily unavailable, due to optimizations>, n=<value temporarily unavailable, due to optimizations>) at eval.c:3157
#13 0x000000010003434b in ruby_exec_internal () at eval.c:1652
#14 0x0000000100034388 in ruby_exec () at eval.c:1672
#15 0x00000001000343b0 in ruby_run () at eval.c:1682
#16 0x0000000100000ee4 in main (argc=<value temporarily unavailable, due to optimizations>, argv=<value temporarily unavailable, due to optimizations>, envp=<value temporarily unavailable, due to optimizations>) at main.c:48