Issue #15490 has been updated by nobu (Nobuyoshi Nakada).

File bug-15490.log added
Description updated

Always it happens here, though I couldn't find the source of `si_destination_compare`, it may be a problem in libsystem_info.dylib.

```
7   ???                           	0x00007fc6cddeaac0 0 + 140491834174144
8   libsystem_trace.dylib         	0x00007fff6e31adb4 os_log_type_enabled + 627
9   libsystem_info.dylib          	0x00007fff6e23305b si_destination_compare_statistics + 1659
10  libsystem_info.dylib          	0x00007fff6e231bf3 si_destination_compare_internal + 707
11  libsystem_info.dylib          	0x00007fff6e231762 si_destination_compare + 530
12  libsystem_info.dylib          	0x00007fff6e20f95f _gai_addr_sort + 111
13  libsystem_c.dylib             	0x00007fff6e1b9a0f _isort + 193
14  libsystem_c.dylib             	0x00007fff6e1b993c _qsort + 2159
15  libsystem_info.dylib          	0x00007fff6e207135 _gai_sort_list + 789
16  libsystem_info.dylib          	0x00007fff6e205b88 si_addrinfo + 2040
17  libsystem_info.dylib          	0x00007fff6e205262 _getaddrinfo_internal + 242
18  libsystem_info.dylib          	0x00007fff6e20515d getaddrinfo + 61
```

----------------------------------------
Bug #15490: socket.rb - recurring segmentation faults
https://bugs.ruby-lang.org/issues/15490#change-76018

* Author: matthew.oriordan (Matthew O'Riordan)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-darwin18]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
With Ruby 2.5.3p105 and now with Ruby 2.6.0 following our recent upgrade, we are sadly still seeing reasonably frequent segmentation faults from Ruby, specifically within socket.rb

Looking in socket.rb, it seems it's related to the address lookup:

    Addrinfo.getaddrinfo(nodename, service, family, socktype, protocol, flags).each(&block)

Segfault report below in full.  Attached are diagnostic reports too.  If there is anything I can do to help reproduce I will, however sadly I have never been able to reproduce reliably, yet sadly it happens once every few days.


---Files--------------------------------
ruby_2018-12-31-032126-2_MacBook-Pro.crash (46.8 KB)
ruby_2018-12-31-032126-3_MacBook-Pro.crash (46.8 KB)
ruby_2018-12-31-032126-1_MacBook-Pro.crash (46.8 KB)
ruby_2018-12-31-032125_MacBook-Pro.crash (46.8 KB)
bug-15490.log (833 KB)


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