GC Assertion Failure: Unaligned Reference Pointer in gc_collect_roots() #19983

Activity

1. vi3tL0u1s

   added

   Bug

   Status: Needs Triage

   on Sep 28, 2025
2. devnexen

   added

   Category: Fibers

   Status: Verified

   and removed

   Status: Needs Triage

   on Sep 28, 2025
3. ndossche commented on Oct 1, 2025

   

   ndossche

   on Oct 1, 2025

   Member

   More actions

   Heavily reduced from the complete garbage that the original was:

   <?php
   class a
   {
       function __destruct()
       {
           $gen = (function () {
               $from = (function () {
                   $cv = [new a];
                   Fiber::suspend();
               })();
               yield from $from;
           })();
           $fiber = new Fiber(function () use ($gen, &$fiber) {
               $gen->current();
           });
           $fiber->start();
       }
   }
   new a;
4. Girgias

   marked Heap-buffer-overflow in zval_ptr_dtor_nogc during Fiber/Generator execution in destructor #20894 as a duplicate of this issue on Jan 11, 2026
5. arnaud-lb

   added a commit that references this issue on Mar 26, 2026

   Fix GH-19983: GC assertion failure with fibers, generators and destru…

   ...

   This issue will close once commit b15c597 is merged into the 'master' branch.

   b15c597
6. arnaud-lb

   closed this as completedin b15c597on Mar 26, 2026
7. arnaud-lb

   added 2 commits that reference this issue on Mar 26, 2026

   Merge branch 'PHP-8.4' into PHP-8.5

   ...

   This issue will close once commit 6f6543e is merged into the 'master' branch.

   6f6543e

   Merge branch 'PHP-8.5'

   ...

   This issue will close once commit 80504a6 is merged into the 'master' branch.

   80504a6