From: xtkoba+ruby@...
Date: 2021-02-27T22:47:47+00:00
Subject: [ruby-core:102648] [Ruby master Feature#17638] Support backtracing with the libbacktrace library

Issue #17638 has been updated by xtkoba (Tee KOBAYASHI).

File ruby-libbacktrace-using-backtrace.patch added

The patch attached here presents an alternative way of using libbacktrace, in which the return addresses are retrieved by `backtrace(3)` and passed to the libbacktrace functions `backtrace_syminfo` and `backtrace_pcinfo`. This patch has to be applied after the main patch.

----------------------------------------
Feature #17638: Support backtracing with the libbacktrace library
https://bugs.ruby-lang.org/issues/17638#change-90641

* Author: xtkoba (Tee KOBAYASHI)
* Status: Open
* Priority: Normal
----------------------------------------
It seems that Ruby's current `addr2line.c` has trouble with the DWARF 5 debugging format (Bug #17585).

I propose that there be an option to use the libbacktrace library instead of `addr2line.c`.

A patch is attached for that. When using libbacktrace, the C level backtrace information looks as follows:
```
-- C level backtrace information -------------------------------------------
0x7f0cc2b3b372 rb_vm_bugreport
	/var/tmp/ruby.build/ruby-devel-x86_64/vm_dump.c:1047
0x7f0cc291e188 rb_bug_for_fatal_signal
	/var/tmp/ruby.build/ruby-devel-x86_64/error.c:801
0x7f0cc2a8a137 sigsegv
	/var/tmp/ruby.build/ruby-devel-x86_64/signal.c:960
0x7f0cc281a9bf ???
	???:0
0x7f0cc247ddf7 ???
	???:0
0x7f0cc2a8990d rb_f_kill
	/var/tmp/ruby.build/ruby-devel-x86_64/signal.c:481
0x7f0cc2a2e684 proc_rb_f_kill
	/var/tmp/ruby.build/ruby-devel-x86_64/process.c:8604
0x7f0cc2b0f2a4 ractor_safe_call_cfunc_m1
	/var/tmp/ruby.build/ruby-devel-x86_64/vm_insnhelper.c:2734
0x7f0cc2b0fecb vm_call_cfunc_with_frame
	/var/tmp/ruby.build/ruby-devel-x86_64/vm_insnhelper.c:2924
0x7f0cc2b10088 vm_call_cfunc
	/var/tmp/ruby.build/ruby-devel-x86_64/vm_insnhelper.c:2945
0x7f0cc2b11b3b vm_call_method_each_type
	/var/tmp/ruby.build/ruby-devel-x86_64/vm_insnhelper.c:3414
0x7f0cc2b11fde vm_call_method
	/var/tmp/ruby.build/ruby-devel-x86_64/vm_insnhelper.c:3507
0x7f0cc2b121ca vm_call_general
	/var/tmp/ruby.build/ruby-devel-x86_64/vm_insnhelper.c:3550
0x7f0cc2b144e7 vm_sendish
	/var/tmp/ruby.build/ruby-devel-x86_64/vm_insnhelper.c:4525
0x7f0cc2b1b196 vm_exec_core
	/var/tmp/ruby.build/ruby-devel-x86_64/insns.def:789
0x7f0cc2b308f5 rb_vm_exec
	/var/tmp/ruby.build/ruby-devel-x86_64/vm.c:2162
0x7f0cc2b316e8 rb_iseq_eval_main
	/var/tmp/ruby.build/ruby-devel-x86_64/vm.c:2419
0x7f0cc292778d rb_ec_exec_node
	/var/tmp/ruby.build/ruby-devel-x86_64/eval.c:317
0x7f0cc29278d3 ruby_run_node
	/var/tmp/ruby.build/ruby-devel-x86_64/eval.c:375
0x55ad53234234 main
	./main.c:47
0x7f0cc2468e59 ???
	???:0
0x55ad532340f9 ???
	???:0
0xffffffffffffffff ???
	???:0
```

The source code of libbacktrace is available from: https://github.com/ianlancetaylor/libbacktrace

---Files--------------------------------
ruby-libbacktrace.patch (1.72 KB)
ruby-libbacktrace-using-backtrace.patch (2.05 KB)


-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>