gdb stuff

gistfile1.txt

dogbert@dogbert-VirtualBox ~/repos/doc $ MVM_JIT_DISABLE=1 perl6-gdb-m --profile xt/examples-compilation.t
================================================================================================
This is Rakudo Perl 6 running in the GNU debugger, which often allows the user to generate useful back-
traces to debug or report issues in Rakudo, the MoarVM backend or the currently running code.

This Rakudo version is 2018.05.122.ga.167.e.6.c built on MoarVM version 2018.05.131.g.9.fb.02.c.9,
running on linuxmint (18.3.Sylvia) / linux (4.10.0.38.generic)

Type `bt full` to generate a backtrace if applicable, type `q` to quit or `help` for help.
------------------------------------------------------------------------------------------------
Reading symbols from /home/dogbert/.rakudobrew/moar-master/install/bin/moar...done.
Starting program: /home/dogbert/.rakudobrew/moar-master/install/bin/moar --execname=/home/dogbert/.rakudobrew/bin/../moar-master/install/bin/perl6-gdb-m --libpath=/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib --libpath=/home/dogbert/.rakudobrew/moar-master/install/share/perl6/lib --libpath=/home/dogbert/.rakudobrew/moar-master/install/share/perl6/runtime /home/dogbert/.rakudobrew/moar-master/install/share/perl6/runtime/perl6.moarvm --profile xt/examples-compilation.t
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff628e700 (LWP 14829)]
[New Thread 0x7ffff3d8a700 (LWP 14830)]
[New Thread 0x7ffff2ef2700 (LWP 14831)]
[New Thread 0x7ffff1c60700 (LWP 14832)]
[New Thread 0x7ffff145f700 (LWP 14835)]
1..4654
ok 1 - doc/Language/5to6-nutshell.pod6 chunk 1 starts with “sub test-d” compiles

Thread 1 "moar" received signal SIGSEGV, Segmentation fault.
0x00007ffff7584c40 in MVM_interp_run (tc=0x604a20, initial_invoke=0x7ffff76cb9e0 <toplevel_initial_invoke>, invoke_data=0x67ff60) at src/core/interp.c:5397
5397	                if (!check || !IS_CONCRETE(check) || STABLE(check) != want)
(gdb) bt
#0  0x00007ffff7584c40 in MVM_interp_run (tc=0x604a20, initial_invoke=0x7ffff76cb9e0 <toplevel_initial_invoke>, invoke_data=0x67ff60) at src/core/interp.c:5397
#1  0x00007ffff76cbb45 in MVM_vm_run_file (instance=0x604010, filename=0x7fffffffe26c "/home/dogbert/.rakudobrew/moar-master/install/share/perl6/runtime/perl6.moarvm") at src/moar.c:412
#2  0x00000000004016f7 in main (argc=8, argv=0x7fffffffdd78) at src/main.c:299
(gdb) info threads
  Id   Target Id         Frame 
* 1    Thread 0x7ffff7fdb700 (LWP 14825) "moar" 0x00007ffff7584c40 in MVM_interp_run (tc=0x604a20, initial_invoke=0x7ffff76cb9e0 <toplevel_initial_invoke>, invoke_data=0x67ff60) at src/core/interp.c:5397
  2    Thread 0x7ffff628e700 (LWP 14829) "moar" pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  3    Thread 0x7ffff3d8a700 (LWP 14830) "moar" pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  4    Thread 0x7ffff2ef2700 (LWP 14831) "moar" 0x00007ffff708e30d in nanosleep () at ../sysdeps/unix/syscall-template.S:84
  5    Thread 0x7ffff1c60700 (LWP 14832) "moar" syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
  6    Thread 0x7ffff145f700 (LWP 14835) "moar" pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
(gdb) p want
$1 = (MVMSTable *) 0x65bbf0
(gdb) l
5392	            OP(sp_guardconc): {
5393	                MVMObject *check = GET_REG(cur_op, 0).o;
5394	                MVMSTable *want  = (MVMSTable *)tc->cur_frame
5395	                    ->effective_spesh_slots[GET_UI16(cur_op, 2)];
5396	                cur_op += 8;
5397	                if (!check || !IS_CONCRETE(check) || STABLE(check) != want)
5398	                    MVM_spesh_deopt_one(tc, GET_UI32(cur_op, -4));
5399	                goto NEXT;
5400	            }
5401	            OP(sp_guardtype): {
(gdb) p *check
Cannot access memory at address 0x8
(gdb) p cur_op
$2 = (MVMuint8 *) 0x7fffec3f9c2c "\b"
(gdb) p *cur_op
$3 = 8 '\b'
(gdb) p MVM_dump_backtrace(tc)
   at gen/moar/stage2/QAST.nqp:3008  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:)
 from gen/moar/stage2/QAST.nqp:1635  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:compile_op)
 from gen/moar/stage2/QAST.nqp:6018  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:compile_node)
 from gen/moar/stage2/QAST.nqp:5221  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:as_mast)
 from gen/moar/stage2/QAST.nqp:5977  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:compile_all_the_stmts)
 from gen/moar/stage2/QAST.nqp:5594  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:)
 from gen/moar/stage2/QAST.nqp:5569  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:)
 from gen/moar/stage2/QAST.nqp:5865  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:compile_node)
 from gen/moar/stage2/QAST.nqp:5221  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:as_mast)
 from gen/moar/stage2/QAST.nqp:5367  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:compile_node)
 from gen/moar/stage2/QAST.nqp:5221  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:as_mast)
 from gen/moar/stage2/QAST.nqp:4957  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:to_mast)
 from gen/moar/stage2/QAST.nqp:6704  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/QAST.moarvm:to_mast)
 from gen/moar/stage2/NQPHLL.nqp:437  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/NQPHLL.moarvm:mast)
 from gen/moar/stage2/NQPHLL.nqp:1825  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/NQPHLL.moarvm:execute_stage)
 from gen/moar/stage2/NQPHLL.nqp:1861  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/NQPHLL.moarvm:run)
 from gen/moar/stage2/NQPHLL.nqp:1869  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/NQPHLL.moarvm:)
 from gen/moar/stage2/NQPHLL.nqp:1886  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/NQPHLL.moarvm:compile)
 from SETTING::src/core/ForeignCode.pm6:63  (/home/dogbert/.rakudobrew/moar-master/install/share/perl6/runtime/CORE.setting.moarvm:EVAL)
 from xt/examples-compilation.t:113  (<ephemeral file>:)
 from xt/examples-compilation.t:113  (<ephemeral file>:)
 from xt/examples-compilation.t:122  (<ephemeral file>:)
 from xt/examples-compilation.t:128  (<ephemeral file>:<unit>)
 from xt/examples-compilation.t:1  (<ephemeral file>:<unit-outer>)
 from gen/moar/stage2/NQPHLL.nqp:1559  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/NQPHLL.moarvm:)
 from gen/moar/stage2/NQPHLL.nqp:73  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/NQPHLL.moarvm:run_profiled)
 from gen/moar/stage2/NQPHLL.nqp:1559  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/NQPHLL.moarvm:eval)
 from gen/moar/stage2/NQPHLL.nqp:1805  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/NQPHLL.moarvm:evalfiles)
 from gen/moar/stage2/NQPHLL.nqp:1695  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/NQPHLL.moarvm:command_eval)
 from src/Perl6/Compiler.nqp:42  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/Perl6/Compiler.moarvm:command_eval)
 from gen/moar/stage2/NQPHLL.nqp:1654  (/home/dogbert/.rakudobrew/moar-master/install/share/nqp/lib/NQPHLL.moarvm:command_line)
 from gen/moar/main.nqp:47  (/home/dogbert/.rakudobrew/moar-master/install/share/perl6/runtime/perl6.moarvm:MAIN)
 from gen/moar/main.nqp:38  (/home/dogbert/.rakudobrew/moar-master/install/share/perl6/runtime/perl6.moarvm:<mainline>)
 from <unknown>:1  (/home/dogbert/.rakudobrew/moar-master/install/share/perl6/runtime/perl6.moarvm:<main>)
 from <unknown>:1  (/home/dogbert/.rakudobrew/moar-master/install/share/perl6/runtime/perl6.moarvm:<entry>)
$4 = void
(gdb)