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	<7a8fd4a7-e07c-4d09-9741-72d3b2b27b06 AT dronecode DOT org DOT uk>
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Date:	Thu, 10 Apr 2025 22:48:35 +0900
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Subject:	Re: A process spawned inside gem command running on latest ruby
	segfaults
To:	cygwin AT cygwin DOT com
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From:	Daisuke Fujimura via Cygwin <cygwin AT cygwin DOT com>
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Thank you for the advice.

I updated cygwin and ran again.

```
$ uname -srvmpio
CYGWIN_NT-10.0-22000-ARM64 3.6.1-1.x86_64 2025-04-09 11:31 UTC x86_64
unknown unknown Cygwin
(snip)
$ gdb /usr/bin/ruby
(gdb) set cygwin-exceptions on
(gdb) run /usr/bin/gem install -V --local --ignore-dependencies
--document=rdoc,ri --build-root
/tmp/cygport-ruby-debug_inspector/ruby-debug_inspector-1.2.0-1.x86_64/inst
--install-dir /usr/share/gems --bindir /usr/bin
debug_inspector-1.2.0.gem
:
Building native extensions. This could take a while...
current directory:
/tmp/cygport-ruby-debug_inspector/ruby-debug_inspector-1.2.0-1.x86_64/inst/usr/share/gems/gems/debug_inspector-1.2.0/ext/debug_inspector
["/usr/bin/ruby.exe", "-I/usr/share/rubygems", "extconf.rb"]
[New Thread 5284.0x2200]
[New Thread 5284.0xe10]
[New Thread 5284.0x50c]
creating Makefile
current directory:
/tmp/cygport-ruby-debug_inspector/ruby-debug_inspector-1.2.0-1.x86_64/inst/usr/share/gems/gems/debug_inspector-1.2.0/ext/debug_inspector
["make", "DESTDIR=", "sitearchdir=./.gem.20250410-1545-swemh8",
"sitelibdir=./.gem.20250410-1545-swemh8", "clean"]

Thread 11 "ruby" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 5284.0xe10]
0x0000000000000000 in ?? ()
(gdb) where
#0  0x0000000000000000 in ?? ()
#1  0x00007ffef1609fb4 in pthread_testcancel () at
/usr/src/debug/cygwin-3.6.1-1/winsup/cygwin/thread.cc:399
#2  pthread_rwlock_wrlock (rwlock=0xa003a9a00) at
/usr/src/debug/cygwin-3.6.1-1/winsup/cygwin/thread.cc:4352
#3  0x00007ffef16eacd4 in _sigfe () at sigfe.s:35
#4  0x00000003ff54e3f9 in cygcrypto-3!CRYPTO_THREAD_write_lock () from
/usr/bin/cygcrypto-3.dll
#5  0x00000003ff541922 in cygcrypto-3!OPENSSL_atexit () from
/usr/bin/cygcrypto-3.dll
#6  0x00000003ff541d43 in cygcrypto-3!OPENSSL_thread_stop () from
/usr/bin/cygcrypto-3.dll
#7  0x00000003ff53fdd3 in ossl_DER_w_end_sequence () from
/usr/bin/cygcrypto-3.dll
#8  0x00007fff4d63d6ac in ?? ()
#9  0x00007fff4d6cb590 in ?? ()
#10 0x00007fff4d6cb590 in ?? ()
#11 0x0000000000000000 in ?? ()
(gdb)
```


On Sat, Feb 22, 2025 at 2:11 AM Jon Turney <jon DOT turney AT dronecode DOT org DOT uk> wrote:
>
> On 20/02/2025 15:33, Daisuke Fujimura via Cygwin wrote:
> > Reproduction:
> > - Use ruby-3.4.2-1 (test)
> > - Install gem containing native libraries
> >
> > ```
> > $ uname -srvmpio
> > CYGWIN_NT-10.0-22000 3.5.7-1.x86_64 2025-01-29 19:46 UTC x86_64
> > unknown unknown Cygwin
> > $ ruby -v
> > ruby 3.4.2 (2025-02-15 revision d2930f8e7a) +PRISM [x86_64-cygwin]
> > $ gem -v
> > 3.5.11
> > $ cd /tmp
> > $ git clone https://cygwin.com/git/cygwin-packages/ruby-debug_inspector
> > # Any gem that contains native libraries
> > $ cd ruby-debug_inspector
> > $ cygport ruby-debug_inspector.cygport fetch prep compile # preparation
> > $ cygport ruby-debug_inspector.cygport install
> > :
> > ```
> >
> > The process spawned inside `gem install` seems to raise SIGSEGV
> > internally and exits.
> >
> > ```
> > $ gdb /usr/bin/ruby
> > :
> > (gdb) run /usr/bin/gem install -V --local --ignore-dependencies
> > --document=rdoc,ri --build-root
> > /tmp/ruby-debug_inspector/ruby-debug_inspector-1.1.0-1.x86_64/inst
> > --install-dir /usr/share/gems --bindir /usr/bin
> > debug_inspector-1.1.0.gem #
> > https://github.com/cygwin/cygport/blob/0.36.9/cygclass/rubygem.cygclass#L134
> > :
> > :
> > Building native extensions. This could take a while...
> > current directory:
> > /tmp/ruby-debug_inspector/ruby-debug_inspector-1.1.0-1.x86_64/inst/usr/share/gems/gems/debug_inspector-1.1.0/ext/debug_inspector
> > ["/usr/bin/ruby.exe", "-I/usr/share/rubygems", "extconf.rb"]
> > [New Thread 3600.0x23a0]
> > [New Thread 3600.0x1278]
> > [New Thread 3600.0x2794]
> > creating Makefile
> >
> > Thread 11 "ruby" received signal SIGSEGV, Segmentation fault.
> > [Switching to Thread 3600.0x1278]
> > 0x0000000000000000 in ?? ()
> >
> [...]
>
> >
> > SIGSEGV seems to occur inside the cygwin DLL.
>
> You might get more useful backtrace information after the exception with
> the gdb setting 'set cygwin-exceptions on' (See [1]).
>
> [1] https://cygwin.com/faq.html#faq.programming.debugging-cygwin
>
> (It would be a nice project for someone to work on to see if is possible
> improve this gdb (mis)feature so it only ignores exceptions inside the
> cygwin DLL where exception::myfault() is on the SEH stack [which is used
> to implement things like "POSIX defines that this function returns
> EFAULT when you hand it an invalid pointer"], not all of them).
>
> > This problem also occurs with ruby-3.3.2-3 (test).
> >
> > We have confirmed that it also occurs in cygwin-3.6.
>

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