[ruby-core:120385] [Ruby master Bug#20976] ethon 0.15.0 began to segfault

["alanwu (Alan Wu) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #20976 has been updated by alanwu (Alan Wu).

Status changed from Open to Third Party's Issue

ethon doesn't seem to be using the ffi gem correctly, since the following makes the spec you point to SEGV consistently, though in a different place than in the OP:

```patch
diff --git a/spec/ethon/multi_spec.rb b/spec/ethon/multi_spec.rb
index a483357..5712bdf 100644
--- a/spec/ethon/multi_spec.rb
+++ b/spec/ethon/multi_spec.rb
@@ -46,8 +46,9 @@ describe Ethon::Multi do
   describe "#socket_action" do
     let(:options) { { :execution_mode => :socket_action } }
     let(:select_state) { { :readers => [], :writers => [], :timeout => 0 } }
-    let(:multi) {
+    let(:multi) do
       multi = Ethon::Multi.new(options)
+      GC.stress = true
       multi.timerfunction = proc do |handle, timeout_ms, userp|
         timeout_ms = nil if timeout_ms == -1
         select_state[:timeout] = timeout_ms
@@ -73,7 +74,9 @@ describe Ethon::Multi do
         :ok
       end
       multi
-    }
+    ensure
+      GC.stress = false
+    end
 
     def fds_to_ios(fds)
       fds.map do |fd|
```

It could also be a bug in the `ffi` gem, but in any case this is highly unlikely to be an issue in ruby proper.

----------------------------------------
Bug #20976: ethon 0.15.0 began to segfault
https://bugs.ruby-lang.org/issues/20976#change-111164

* Author: mtasaka (Mamoru TASAKA)
* Status: Third Party's Issue
* ruby -v: ruby 3.4.0dev (2024-12-21 master 6114094aa0) +PRISM [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
Looks like ethon 0.15.0:
https://github.com/typhoeus/ethon/tree/0b1c2278806502ecbc6814a245f6b11f5365e68c
began to segfault frequently (not always) with recent ruby 3.4.0dev.

Looks like:
commit:fef8ecc708 does not cause segfault
commit:018b775039 seems to cause segfault:

Trying with commit:6114094aa0 , segfaulting log is attached.

---Files--------------------------------
backtrace.log.txt (86 KB)
Gemfile (819 Bytes)


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