GNU gdb (GDB) 7.4.1-debian
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
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This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/ew/r/trunk/bin/ruby...done.
[New LWP 7639]
[New LWP 7641]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `ruby -rcoverage -e Coverage.start; fork {}'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007fab6189e275 in find_entry (bin_pos=<optimized out>, hash_val=10736, 
    key=10736, table=<optimized out>) at st.c:388
388		while (PTR_NOT_EQUAL(table, ptr->next, hash_val, key)) {
(gdb) #0  0x00007fab6189e275 in find_entry (bin_pos=<optimized out>, hash_val=10736, 
    key=10736, table=<optimized out>) at st.c:388
#1  st_lookup (table=0x7fab639477c0, key=key@entry=10736, 
    value=value@entry=0x7fab639776a0) at st.c:426
#2  0x00007fab61833b89 in rb_id2str (id=10736) at parse.y:10600
#3  0x00007fab61834f89 in rb_id2name (id=<optimized out>) at parse.y:10636
#4  0x00007fab61913be2 in control_frame_dump (cfp=0x7fab604a6f20, 
    th=<optimized out>) at vm_dump.c:106
#5  rb_vmdebug_stack_dump_raw (th=0x7fab639425b0, cfp=0x7fab604a6f20)
    at vm_dump.c:163
#6  0x00007fab6191424a in rb_vm_bugreport () at vm_dump.c:733
#7  0x00007fab61979550 in report_bug (file=file@entry=0x7fab63960c98 "-e", 
    line=<optimized out>, 
    fmt=fmt@entry=0x7fab619aca7d "Segmentation fault at %p", 
    args=args@entry=0x7fab63977a78) at error.c:312
#8  0x00007fab6197a6a3 in rb_bug (
    fmt=fmt@entry=0x7fab619aca7d "Segmentation fault at %p") at error.c:339
#9  0x00007fab61894dd1 in sigsegv (sig=<optimized out>, info=0x7fab63977cb0, 
    ctx=<optimized out>) at signal.c:704
#10 <signal handler called>
#11 0x00007fab6191a7c4 in update_method_coverage (event=262144, proc=8, 
    self=140374086820840, id=0, klass=0) at thread.c:5142
#12 0x00007fab6191862f in exec_hooks_body (trace_arg=0x7ffffd1c4680, 
    th=<optimized out>, list=<optimized out>) at vm_trace.c:262
#13 exec_hooks_unprotected (th=th@entry=0x7fab639425b0, list=<optimized out>, 
    trace_arg=trace_arg@entry=0x7ffffd1c4680) at vm_trace.c:288
#14 0x00007fab619186f5 in rb_threadptr_exec_event_hooks_orig (
    trace_arg=trace_arg@entry=0x7ffffd1c4680, pop_p=pop_p@entry=0)
    at vm_trace.c:329
#15 0x00007fab61919a37 in rb_threadptr_exec_event_hooks (
    trace_arg=trace_arg@entry=0x7ffffd1c4680) at vm_trace.c:382
#16 0x00007fab6191f979 in rb_threadptr_execute_interrupts (
    th=th@entry=0x7fab639425b0, blocking_timing=blocking_timing@entry=0)
    at thread.c:1969
#17 0x00007fab619203ee in rb_threadptr_execute_interrupts (
    th=th@entry=0x7fab639425b0, blocking_timing=blocking_timing@entry=0)
    at thread.c:1909
#18 0x00007fab61907182 in vm_exec_core (th=0x7fab639425b0, 
    initial=initial@entry=0) at insns.def:1092
#19 0x00007fab619078c9 in vm_exec (th=0x0) at vm.c:1326
#20 0x00007fab6190f740 in rb_yield_0 (argc=<optimized out>, 
    argv=<optimized out>) at vm_eval.c:932
#21 rb_yield (val=val@entry=52) at vm_eval.c:939
#22 0x00007fab617cf351 in rb_protect (proc=0x7fab6190f700 <rb_yield>, 
    data=data@entry=52, state=state@entry=0x7ffffd1c4c7c) at eval.c:857
#23 0x00007fab61851e52 in rb_f_fork (obj=<optimized out>) at process.c:3406
#24 rb_f_fork (obj=<optimized out>) at process.c:3394
#25 0x00007fab618fe9b0 in vm_call_cfunc_with_frame (
    th=th@entry=0x7fab639425b0, reg_cfp=reg_cfp@entry=0x7fab604a6f70, 
    ci=ci@entry=0x7fab63daf8f0) at vm_insnhelper.c:1470
#26 0x00007fab6190bc65 in vm_call_cfunc (ci=0x7fab63daf8f0, 
    reg_cfp=0x7fab604a6f70, th=0x7fab639425b0) at vm_insnhelper.c:1560
#27 vm_call_method (th=0x7fab639425b0, cfp=0x7fab604a6f70, ci=0x7fab63daf8f0)
    at vm_insnhelper.c:1754
#28 0x00007fab61904203 in vm_exec_core (th=0x7fab639425b0, 
    initial=initial@entry=0) at insns.def:999
#29 0x00007fab619078c9 in vm_exec (th=0x1c, th@entry=0x7fab639425b0)
    at vm.c:1326
#30 0x00007fab619111d5 in rb_iseq_eval_main (
    iseqval=iseqval@entry=140374091046760) at vm.c:1584
#31 0x00007fab617cba3a in ruby_exec_internal (n=0x7fab63d51f68) at eval.c:251
#32 0x00007fab617ce9c7 in ruby_exec_node (n=0x7fab63d51f68) at eval.c:316
#33 ruby_run_node (n=<optimized out>) at eval.c:308
#34 0x00007fab617cafbb in main (argc=4, argv=0x7ffffd1c53e8) at main.c:36
(gdb) quit