From: xtkoba+ruby@...
Date: 2021-08-13T13:45:53+00:00
Subject: [ruby-core:104911] [Ruby master Bug#17052] Ruby with LTO enabled has issues with SIGSEGV handler
Issue #17052 has been updated by xtkoba (Tee KOBAYASHI).
File ruby-addr2line-read_abstract_origin.patch added
It turns out that `DW_FORM_ref_addr` is not interpreted correctly. A patch is attached to just ignore that form (and other forms that are not supposed to be used currently in `addr2line.c`). This ignorance does not seem to affect the quality of C backtrace printing very much, and so I am not going to add the interpretation of currently ignored forms for now.
FYI, the forms that can be used for a value of `DW_AT_abstract_origin` are described in 7.5.5 of DWARF 5 specification (pp.217--218 in DWARF5.pdf).
----------------------------------------
Bug #17052: Ruby with LTO enabled has issues with SIGSEGV handler
https://bugs.ruby-lang.org/issues/17052#change-93272
* Author: vo.x (Vit Ondruch)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [powerpc64le-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
Fedora aims to enable link time optimization (LTO) of packages in next release. The specific changes in configuration options are available here [1]. Since that time, I observe following errors [2] at least on {aarch64,ppc64le} (and possibly also other architectures):
~~~
1) Failure:
TestBugReporter#test_bug_reporter_add [/builddir/build/BUILD/ruby-2.7.1/test/-ext-/bug_reporter/test_bug_reporter.rb:22]:
pid 32395 killed by SIGSEGV (signal 11) (core dumped)
| -:1: [BUG] Segmentation fault at 0x000003e800007e8b
| ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [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:000f80 (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:000f80 (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 120 characters.
2) Failure:
TestRubyOptions#test_segv_loaded_features [/builddir/build/BUILD/ruby-2.7.1/test/ruby/test_rubyoptions.rb:735]:
pid 38444 killed by SIGSEGV (signal 11) (core dumped)
| -e:1: [BUG] Segmentation fault at 0x000003e80000962c
| ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [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:002460 (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-2.7.1/test/ruby/test_rubyoptions.rb:749]:
pid 38451 killed by SIGSEGV (signal 11) (core dumped)
| -e:1: [BUG] Segmentation fault at 0x000003e800009633
| ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [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:000480 (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-2.7.1/test/ruby/test_rubyoptions.rb:729]:
pid 38460 killed by SIGSEGV (signal 11) (core dumped)
| -e:1: [BUG] Segmentation fault at 0x000003e80000963c
| ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [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:0006a0 (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 840.600443s, 25.0047 tests/s, 3238.9681 assertions/s.
21019 tests, 2722678 assertions, 4 failures, 0 errors, 70 skips
ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [powerpc64le-linux]
~~~
When I raised the issue on fedora-devel ML [3], there was suggestion that it might happen when signal handler modifies any global variable. Now I am not sure if that is the case. Can somebody confirm? Or investigate/fix this, please?
[1]: https://src.fedoraproject.org/rpms/redhat-rpm-config/c/5baaf4a99cc77572d3496a7000674098bef7ed68?branch=master
[2]: https://koschei.fedoraproject.org/package/ruby
[3]: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/message/D6YUXPU5C2RWIQMNHLT4HBYXUGVKKPOW/
---Files--------------------------------
ruby-addr2line-DW_FORM_ref_addr.patch (651 Bytes)
ruby-addr2line-read_abstract_origin.patch (1.37 KB)
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