[ruby-core:102732] [Ruby master Bug#17585] DWARF5 support?

Issue #17585 has been updated by xtkoba (Tee KOBAYASHI).


Glad to hear that :-)

What I am still (probably too) anxious about is that the current `addr2line.c` calls a lot of async-signal unsafe functions in it. It is true that practically they seem to cause no problem 99% of the time. But theoretically any chaos can happen as long as these functions are used.

----------------------------------------
Bug #17585: DWARF5 support?
https://bugs.ruby-lang.org/issues/17585#change-90730

* Author: vo.x (Vit Ondruch)
* Status: Open
* Priority: Normal
* ruby -v: ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [armv7hl-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Fedora recently switched from DWARF4 to DWARF5 and since that time, I observe test suite errors on ppc64le:

~~~
  1) Failure:
TestBugReporter#test_bug_reporter_add [/builddir/build/BUILD/ruby-3.0.0/test/-ext-/bug_reporter/test_bug_reporter.rb:24]:
pid 1691449 killed by SIGSEGV (signal 11) (core dumped)
| -:1: [BUG] Segmentation fault at 0x000003e80019cf39
| ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [powerpc64le-linux]
| 
| -- Control frame information -----------------------------------------------
| c:0003 p:---- s:0012 e:000011 CFUNC  :kill
| c:0002 p:0021 s:0006 e:000005 EVAL   -:1 [FINISH]
| c:0001 p:0000 s:0003 E:000480 (none) [FINISH]
| 
| -- Ruby level backtrace information ----------------------------------------
| -:1:in `<main>'
| -:1:in `kill'
| 
| -- C level backtrace information -------------------------------------------
..
1. [2/2] Assertion for "stderr"
   | Expected /Sample bug reporter: 12345/
   | to match
   |   "-- Control frame information -----------------------------------------------\n"+
   |   "c:0003 p:---- s:0012 e:000011 CFUNC  :kill\n"+
   |   "c:0002 p:0021 s:0006 e:000005 EVAL   -:1 [FINISH]\n"+
   |   "c:0001 p:0000 s:0003 E:000480 (none) [FINISH]\n\n"+
   |   "-- Ruby level backtrace information ----------------------------------------\n"+
   |   "-:1:in `<main>'\n"+
   |   "-:1:in `kill'\n\n"+
   |   "-- C level backtrace information -------------------------------------------\n"
   | after 4 patterns with 119 characters.
  2) Failure:
TestRubyOptions#test_segv_loaded_features [/builddir/build/BUILD/ruby-3.0.0/test/ruby/test_rubyoptions.rb:748]:
pid 1721938 killed by SIGSEGV (signal 11) (core dumped)
| -e:1: [BUG] Segmentation fault at 0x000003e8001a4652
| ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [powerpc64le-linux]
| 
| -- Control frame information -----------------------------------------------
| c:0003 p:---- s:0012 e:000011 CFUNC  :kill
| c:0002 p:0016 s:0006 e:000005 BLOCK  -e:1 [FINISH]
| c:0001 p:0000 s:0003 E:000f80 (none) [FINISH]
| 
| -- Ruby level backtrace information ----------------------------------------
| -e:1:in `block in <main>'
| -e:1:in `kill'
| 
| -- C level backtrace information -------------------------------------------
..
1. [2/2] Assertion for "stderr"
   | <""> expected but was
   | <"-- C level backtrace information -------------------------------------------\n">.
  3) Failure:
TestRubyOptions#test_segv_setproctitle [/builddir/build/BUILD/ruby-3.0.0/test/ruby/test_rubyoptions.rb:762]:
pid 1721957 killed by SIGSEGV (signal 11) (core dumped)
| -e:1: [BUG] Segmentation fault at 0x000003e8001a4665
| ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [powerpc64le-linux]
| 
| -- Control frame information -----------------------------------------------
| c:0003 p:---- s:0012 e:000011 CFUNC  :kill
| c:0002 p:0029 s:0006 e:000005 EVAL   -e:1 [FINISH]
| c:0001 p:0000 s:0003 E:0015c0 (none) [FINISH]
| 
| -- Ruby level backtrace information ----------------------------------------
| -e:1:in `<main>'
| -e:1:in `kill'
| 
| -- C level backtrace information -------------------------------------------
..
1. [2/2] Assertion for "stderr"
   | <""> expected but was
   | <"-- C level backtrace information -------------------------------------------\n">.
  4) Failure:
TestRubyOptions#test_segv_test [/builddir/build/BUILD/ruby-3.0.0/test/ruby/test_rubyoptions.rb:742]:
pid 1721966 killed by SIGSEGV (signal 11) (core dumped)
| -e:1: [BUG] Segmentation fault at 0x000003e8001a466e
| ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [powerpc64le-linux]
| 
| -- Control frame information -----------------------------------------------
| c:0003 p:---- s:0012 e:000011 CFUNC  :kill
| c:0002 p:0015 s:0006 e:000005 EVAL   -e:1 [FINISH]
| c:0001 p:0000 s:0003 E:001fa0 (none) [FINISH]
| 
| -- Ruby level backtrace information ----------------------------------------
| -e:1:in `<main>'
| -e:1:in `kill'
| 
| -- C level backtrace information -------------------------------------------
..
1. [2/2] Assertion for "stderr"
   | <""> expected but was
   | <"-- C level backtrace information -------------------------------------------\n">.
Finished tests in 1111.355067s, 18.8689 tests/s, 2396.5689 assertions/s.
20970 tests, 2663439 assertions, 4 failures, 0 errors, 60 skips
ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [powerpc64le-linux]
~~~

And similar issues on armv7hl:

~~~
  1) Failure:
TestBugReporter#test_bug_reporter_add [/builddir/build/BUILD/ruby-3.0.0/test/-ext-/bug_reporter/test_bug_reporter.rb:24]:
pid 722 killed by SIGSEGV (signal 11) (core dumped)
| -:1: [BUG] Segmentation fault at 0x000002d2
| ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [armv7hl-linux]
| 
| -- Control frame information -----------------------------------------------
| c:0003 p:---- s:0012 e:000011 CFUNC  :kill
| c:0002 p:0021 s:0006 e:000005 EVAL   -:1 [FINISH]
| c:0001 p:0000 s:0003 E:000c98 (none) [FINISH]
| 
| -- Ruby level backtrace information ----------------------------------------
| -:1:in `<main>'
| -:1:in `kill'
| 
| -- Machine register context ------------------------------------------------
|  "r0: 0x00000000 "r1: 0x0000000b "r2: 0x00000001 "r3: 0x00000001 "r4: 0x000002d2
|  "r5: 0xb689a028 "r6: 0x0000000b "r7: 0x00000025 "r8: 0x00000002 "r9: 0x000002d2
|  "r1: 0x00000001 "sp: 0xbe846d1c "fa: 0x00000000
| 
| -- C level backtrace information -------------------------------------------
..
1. [2/2] Assertion for "stderr"
   | Expected /Sample bug reporter: 12345/
   | to match
   |   "-- Control frame information -----------------------------------------------\n"+
   |   "c:0003 p:---- s:0012 e:000011 CFUNC  :kill\n"+
   |   "c:0002 p:0021 s:0006 e:000005 EVAL   -:1 [FINISH]\n"+
   |   "c:0001 p:0000 s:0003 E:000c98 (none) [FINISH]\n\n"+
   |   "-- Ruby level backtrace information ----------------------------------------\n"+
   |   "-:1:in `<main>'\n"+
   |   "-:1:in `kill'\n\n"+
   |   "-- Machine register context ------------------------------------------------\n"+
   |   " \"r0: 0x00000000 \"r1: 0x0000000b \"r2: 0x00000001 \"r3: 0x00000001 \"r4: 0x000002d2\n"+
   |   " \"r5: 0xb689a028 \"r6: 0x0000000b \"r7: 0x00000025 \"r8: 0x00000002 \"r9: 0x000002d2\n"+
   |   " \"r1: 0x00000001 \"sp: 0xbe846d1c \"fa: 0x00000000\n\n"+
   |   "-- C level backtrace information -------------------------------------------\n"
   | after 4 patterns with 107 characters.
  2) Failure:
TestRubyOptions#test_segv_loaded_features [/builddir/build/BUILD/ruby-3.0.0/test/ruby/test_rubyoptions.rb:748]:
pid 8085 killed by SIGSEGV (signal 11) (core dumped)
| -e:1: [BUG] Segmentation fault at 0x00001f95
| ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [armv7hl-linux]
| 
| -- Control frame information -----------------------------------------------
| c:0003 p:---- s:0012 e:000011 CFUNC  :kill
| c:0002 p:0016 s:0006 e:000005 BLOCK  -e:1 [FINISH]
| c:0001 p:0000 s:0003 E:000660 (none) [FINISH]
| 
| -- Ruby level backtrace information ----------------------------------------
| -e:1:in `block in <main>'
| -e:1:in `kill'
| 
| -- Machine register context ------------------------------------------------
|  "r0: 0x00000000 "r1: 0x0000000b "r2: 0x00000001 "r3: 0x00000001 "r4: 0x00001f95
|  "r5: 0xb68e3028 "r6: 0x0000000b "r7: 0x00000025 "r8: 0x00000002 "r9: 0x00001f95
|  "r1: 0x00000001 "sp: 0xbe8c5ac4 "fa: 0x00000000
| 
| -- C level backtrace information -------------------------------------------
..
1. [2/2] Assertion for "stderr"
   | <""> expected but was
   | <"-- C level backtrace information -------------------------------------------\n">.
  3) Failure:
TestRubyOptions#test_segv_setproctitle [/builddir/build/BUILD/ruby-3.0.0/test/ruby/test_rubyoptions.rb:762]:
pid 8092 killed by SIGSEGV (signal 11) (core dumped)
| -e:1: [BUG] Segmentation fault at 0x00001f9c
| ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [armv7hl-linux]
| 
| -- Control frame information -----------------------------------------------
| c:0003 p:---- s:0012 e:000011 CFUNC  :kill
| c:0002 p:0029 s:0006 e:000005 EVAL   -e:1 [FINISH]
| c:0001 p:0000 s:0003 E:000550 (none) [FINISH]
| 
| -- Ruby level backtrace information ----------------------------------------
| -e:1:in `<main>'
| -e:1:in `kill'
| 
| -- Machine register context ------------------------------------------------
|  "r0: 0x00000000 "r1: 0x0000000b "r2: 0x00000001 "r3: 0x00000001 "r4: 0x00001f9c
|  "r5: 0xb685d028 "r6: 0x0000000b "r7: 0x00000025 "r8: 0x00000002 "r9: 0x00001f9c
|  "r1: 0x00000001 "sp: 0xbef7acfc "fa: 0x00000000
| 
| -- C level backtrace information -------------------------------------------
..
1. [2/2] Assertion for "stderr"
   | <""> expected but was
   | <"-- C level backtrace information -------------------------------------------\n">.
  4) Failure:
TestRubyOptions#test_segv_test [/builddir/build/BUILD/ruby-3.0.0/test/ruby/test_rubyoptions.rb:742]:
pid 8101 killed by SIGSEGV (signal 11) (core dumped)
| -e:1: [BUG] Segmentation fault at 0x00001fa5
| ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [armv7hl-linux]
| 
| -- Control frame information -----------------------------------------------
| c:0003 p:---- s:0012 e:000011 CFUNC  :kill
| c:0002 p:0015 s:0006 e:000005 EVAL   -e:1 [FINISH]
| c:0001 p:0000 s:0003 E:001f50 (none) [FINISH]
| 
| -- Ruby level backtrace information ----------------------------------------
| -e:1:in `<main>'
| -e:1:in `kill'
| 
| -- Machine register context ------------------------------------------------
|  "r0: 0x00000000 "r1: 0x0000000b "r2: 0x00000001 "r3: 0x00000001 "r4: 0x00001fa5
|  "r5: 0xb68bc028 "r6: 0x0000000b "r7: 0x00000025 "r8: 0x00000002 "r9: 0x00001fa5
|  "r1: 0x00000001 "sp: 0xbee96d3c "fa: 0x00000000
| 
| -- C level backtrace information -------------------------------------------
..
1. [2/2] Assertion for "stderr"
   | <""> expected but was
   | <"-- C level backtrace information -------------------------------------------\n">.
Finished tests in 1428.305544s, 14.6810 tests/s, 1866.1553 assertions/s.
20969 tests, 2665440 assertions, 4 failures, 0 errors, 56 skips
ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [armv7hl-linux]
~~~

So is it really due to DWARF5? Why is that just on two platforms?

---Files--------------------------------
ruby-addr2line-dwarf5.patch (1.92 KB)
ruby-dwarf5-debug_line.patch (11 KB)
ruby-dwarf5-avoid_crash-r1.patch (6.14 KB)


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