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Getting a ruby line number from a crashed process

  • ben_lubar

    I have a core dump of a process with an embedded ruby interpreter that crashed. How do I get a function name or line number or anything that would identify where the problem is in my code?

    Reading symbols from libs/Dwarf_Fortress...(no debugging symbols found)...done.
[New LWP 22392]
[New LWP 22394]
[New LWP 22393]
[New LWP 22386]
[New LWP 22395]
[New LWP 22391]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `./libs/Dwarf_Fortress'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0xf3bb3e73 in rb_dfmemory_read_int8(unsigned long, unsigned long) ()
   from /home/ben/df_linux/hack/plugins/ruby.plug.so
(gdb) bt
#0  0xf3bb3e73 in rb_dfmemory_read_int8(unsigned long, unsigned long) ()
   from /home/ben/df_linux/hack/plugins/ruby.plug.so
#1  0xf394aa13 in ?? () from hack/libruby.so
#2  0xf39561c1 in ?? () from hack/libruby.so
#3  0xf395635a in ?? () from hack/libruby.so
#4  0xf39535bb in ?? () from hack/libruby.so
#5  0xf3952952 in ?? () from hack/libruby.so
#6  0xf3956071 in ?? () from hack/libruby.so
#7  0xf395635a in ?? () from hack/libruby.so
#8  0xf39535bb in ?? () from hack/libruby.so
#9  0xf3954b8b in ?? () from hack/libruby.so
#10 0xf3955144 in ?? () from hack/libruby.so
#11 0xf3955b38 in ?? () from hack/libruby.so
#12 0xf395635a in ?? () from hack/libruby.so
#13 0xf39535bb in ?? () from hack/libruby.so
#14 0xf3950c6b in ?? () from hack/libruby.so
#15 0xf3952c49 in ?? () from hack/libruby.so
#16 0xf3950b6b in ?? () from hack/libruby.so
#17 0xf3954b8b in ?? () from hack/libruby.so
#18 0xf3960197 in rb_yield () from hack/libruby.so
#19 0xf3942332 in ?? () from hack/libruby.so
#20 0xf39547f5 in ?? () from hack/libruby.so
#21 0xf3960197 in rb_yield () from hack/libruby.so
#22 0xf3931441 in rb_ary_each () from hack/libruby.so
---Type <return> to continue, or q <return> to quit---
#23 0xf394aa1d in ?? () from hack/libruby.so
#24 0xf39561c1 in ?? () from hack/libruby.so
#25 0xf395635a in ?? () from hack/libruby.so
#26 0xf3956fec in ?? () from hack/libruby.so
#27 0xf3957174 in rb_funcall () from hack/libruby.so
#28 0xf3943627 in rb_each () from hack/libruby.so
#29 0xf394c6e9 in rb_iterate () from hack/libruby.so
#30 0xf3943493 in ?? () from hack/libruby.so
#31 0xf394aa38 in ?? () from hack/libruby.so
#32 0xf39561c1 in ?? () from hack/libruby.so
#33 0xf395635a in ?? () from hack/libruby.so
#34 0xf39535bb in ?? () from hack/libruby.so
#35 0xf3954073 in ?? () from hack/libruby.so
#36 0xf3952952 in ?? () from hack/libruby.so
#37 0xf3956071 in ?? () from hack/libruby.so
#38 0xf395635a in ?? () from hack/libruby.so
#39 0xf39534cc in ?? () from hack/libruby.so
#40 0xf3952c68 in ?? () from hack/libruby.so
#41 0xf39522ff in ?? () from hack/libruby.so
#42 0xf3954b8b in ?? () from hack/libruby.so
#43 0xf3960197 in rb_yield () from hack/libruby.so
#44 0xf39a5193 in ?? () from hack/libruby.so
#45 0xf394aa1d in ?? () from hack/libruby.so
#46 0xf39561c1 in ?? () from hack/libruby.so
---Type <return> to continue, or q <return> to quit---
#47 0xf395635a in ?? () from hack/libruby.so
#48 0xf39535bb in ?? () from hack/libruby.so
#49 0xf3954073 in ?? () from hack/libruby.so
#50 0xf3954b8b in ?? () from hack/libruby.so
#51 0xf3960197 in rb_yield () from hack/libruby.so
#52 0xf39a5193 in ?? () from hack/libruby.so
#53 0xf394aa1d in ?? () from hack/libruby.so
#54 0xf39561c1 in ?? () from hack/libruby.so
#55 0xf395635a in ?? () from hack/libruby.so
#56 0xf39535bb in ?? () from hack/libruby.so
#57 0xf3954073 in ?? () from hack/libruby.so
#58 0xf3954b8b in ?? () from hack/libruby.so
#59 0xf3960197 in rb_yield () from hack/libruby.so
#60 0xf39a5193 in ?? () from hack/libruby.so
#61 0xf394aa1d in ?? () from hack/libruby.so
#62 0xf39561c1 in ?? () from hack/libruby.so
#63 0xf395635a in ?? () from hack/libruby.so
#64 0xf39535bb in ?? () from hack/libruby.so
#65 0xf3954073 in ?? () from hack/libruby.so
#66 0xf3956071 in ?? () from hack/libruby.so
#67 0xf395635a in ?? () from hack/libruby.so
#68 0xf39535bb in ?? () from hack/libruby.so
#69 0xf3956071 in ?? () from hack/libruby.so
#70 0xf395635a in ?? () from hack/libruby.so
---Type <return> to continue, or q <return> to quit---
#71 0xf39534cc in ?? () from hack/libruby.so
#72 0xf39522ff in ?? () from hack/libruby.so
#73 0xf3954b8b in ?? () from hack/libruby.so
#74 0xf3960197 in rb_yield () from hack/libruby.so
#75 0xf3980201 in ?? () from hack/libruby.so
#76 0xf394aa1d in ?? () from hack/libruby.so
#77 0xf39561c1 in ?? () from hack/libruby.so
#78 0xf395635a in ?? () from hack/libruby.so
#79 0xf39535bb in ?? () from hack/libruby.so
#80 0xf3954073 in ?? () from hack/libruby.so
#81 0xf3956071 in ?? () from hack/libruby.so
#82 0xf395635a in ?? () from hack/libruby.so
#83 0xf3950dff in ?? () from hack/libruby.so
#84 0xf3952c68 in ?? () from hack/libruby.so
#85 0xf3954b8b in ?? () from hack/libruby.so
#86 0xf3955144 in ?? () from hack/libruby.so
#87 0xf394aa5e in ?? () from hack/libruby.so
#88 0xf39561c1 in ?? () from hack/libruby.so
#89 0xf395635a in ?? () from hack/libruby.so
#90 0xf39535bb in ?? () from hack/libruby.so
#91 0xf3953b08 in ?? () from hack/libruby.so
#92 0xf3956071 in ?? () from hack/libruby.so
#93 0xf395635a in ?? () from hack/libruby.so
#94 0xf39535bb in ?? () from hack/libruby.so
---Type <return> to continue, or q <return> to quit---
#95 0xf3954b8b in ?? () from hack/libruby.so
#96 0xf3960197 in rb_yield () from hack/libruby.so
#97 0xf3931441 in rb_ary_each () from hack/libruby.so
#98 0xf394aa1d in ?? () from hack/libruby.so
#99 0xf39561c1 in ?? () from hack/libruby.so
#100 0xf395635a in ?? () from hack/libruby.so
#101 0xf39535bb in ?? () from hack/libruby.so
#102 0xf3954073 in ?? () from hack/libruby.so
#103 0xf3956071 in ?? () from hack/libruby.so
#104 0xf395635a in ?? () from hack/libruby.so
#105 0xf39535bb in ?? () from hack/libruby.so
#106 0xf3961ea2 in ?? () from hack/libruby.so
#107 0xf39628af in rb_eval_string () from hack/libruby.so
#108 0xf394c481 in rb_protect () from hack/libruby.so
#109 0xf394c4be in rb_eval_string_protect () from hack/libruby.so
#110 0xf3bb6669 in df_rubythread(void*) ()
   from /home/ben/df_linux/hack/plugins/ruby.plug.so
#111 0xf3bba0b1 in tthread::thread::wrapper_function(void*) ()
   from /home/ben/df_linux/hack/plugins/ruby.plug.so
#112 0xf7232f70 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#113 0xf733447e in clone () from /lib/i386-linux-gnu/libc.so.6
(gdb)
    0
  • tar

    StackOverflow is suggesting to use Pry.

    How/whether you can shoehorn that into DF though, you may be on your own there? :/

    0
  • HardwareGeek

    @ben_lubar said:

    Reading symbols from libs/Dwarf_Fortress

    Found the problem...

    4
  • ben_lubar

    Ok, here's the answer:

    1. up until p *node gives an answer other than "optimized out"
    2. p (*node)->nd_file is the filename.
    3. p (*node)->flags >> 19 is the line number.
    1
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