[ruby-dev:51147] [Ruby master Bug#18497] Fiber内でProcess.daemonをするとSegmentation faultが起こる

["nobu (Nobuyoshi Nakada)" <noreply@ruby-lang.org>]

Issue #18497 has been updated by nobu (Nobuyoshi Nakada).


In 2.7 or earlier, commit:bf3b2a43741e or the following patch is also needed.
```diff
diff --git a/cont.c b/cont.c
index 7f971a9e9d5..50403b8258d 100644
--- a/cont.c
+++ b/cont.c
@@ -1930,7 +1930,7 @@ fiber_current(void)
 }
 
 static inline rb_fiber_t*
-return_fiber(void)
+return_fiber(bool terminate)
 {
     rb_fiber_t *fiber = fiber_current();
     rb_fiber_t *prev = fiber->prev;
@@ -1941,7 +1941,7 @@ return_fiber(void)
 
         VM_ASSERT(root_fiber != NULL);
 
-        if (root_fiber == fiber) {
+        if (!terminate && root_fiber == fiber) {
             rb_raise(rb_eFiberError, "can't yield from root fiber");
         }
         return root_fiber;
@@ -2087,7 +2087,7 @@ rb_fiber_terminate(rb_fiber_t *fiber, int need_interrupt)
     fiber->cont.machine.stack = NULL;
     fiber->cont.machine.stack_size = 0;
 
-    next_fiber = return_fiber();
+    next_fiber = return_fiber(true);
     if (need_interrupt) RUBY_VM_SET_INTERRUPT(&next_fiber->cont.saved_ec);
     fiber_switch(next_fiber, 1, &value, 0, RB_NO_KEYWORDS);
 }
@@ -2121,13 +2121,13 @@ rb_fiber_resume(VALUE fiber_value, int argc, const VALUE *argv)
 VALUE
 rb_fiber_yield_kw(int argc, const VALUE *argv, int kw_splat)
 {
-    return fiber_switch(return_fiber(), argc, argv, 0, kw_splat);
+    return fiber_switch(return_fiber(false), argc, argv, 0, kw_splat);
 }
 
 VALUE
 rb_fiber_yield(int argc, const VALUE *argv)
 {
-    return fiber_switch(return_fiber(), argc, argv, 0, RB_NO_KEYWORDS);
+    return fiber_switch(return_fiber(false), argc, argv, 0, RB_NO_KEYWORDS);
 }
 
 void
```

----------------------------------------
Bug #18497: Fiber内でProcess.daemonをするとSegmentation faultが起こる
https://bugs.ruby-lang.org/issues/18497#change-96055

* Author: sevenc-nanashi (Nanashi. @sevenc-nanashi)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [aarch64-linux]
* Backport: 2.6: REQUIRED, 2.7: REQUIRED, 3.0: REQUIRED, 3.1: REQUIRED
----------------------------------------
```
ruby -e 'Fiber.new { Process.daemon true, true }.resume'
```

OCIのUbuntu（`ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [aarch64-linux]`）で確認出来ましたが、WSL（`ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [x86_64-linux]`）では確認出来ませんでした。


---Files--------------------------------
sf.log (17 KB)


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