[GLib][Ruby] ci/scripts/c_glib_test.sh fails consistently on new macos-26-arm64

[raulcd]

Describe the bug, including details regarding any error messages, version, and platform.

ARM64 macOS GLib & Ruby fails on several PRs with:

+ ruby test/run-test.rb
[BUG] Bus Error at 0x0000000a70000018
ruby 3.4.9 (2026-03-11 revision 76cca827ab) +PRISM [arm64-darwin25]

-- Crash Report log information --------------------------------------------
   See Crash Report log file in one of the following locations:
     * ~/Library/Logs/DiagnosticReports
     * /Library/Logs/DiagnosticReports
   for more details.
Don't forget to include the above Crash Report log file in bug reports.

-- Control frame information -----------------------------------------------
c:0001 p:---- s:0003 e:000002 DUMMY  [FINISH]


-- Threading information ---------------------------------------------------
Total ractor count: 1
Ruby thread count for this ractor: 3

-- Machine register context ------------------------------------------------
  x0: 0x0000000a6f6cf350  x1: 0x0000000a6bfd0280  x2: 0x0000000115883270
  x3: 0x0000000000000001  x4: 0x0000000000000001  x5: 0x0000000000000000
  x6: 0x000000011582c538  x7: 0xfffff0003ffff800 x18: 0x0000000000000000
 x19: 0x0000000000000003 x20: 0x0000000115883270 x21: 0x0000000a6bfd0280
 x22: 0x0000000000000001 x23: 0x0000000000000024 x24: 0x0000000a6f6cf350
 x25: 0x000000011628e760 x26: 0x0000000000000004 x27: 0x000000000001b01a
 x28: 0x0000000000000003  lr: 0x0000000105211af8  fp: 0x000000016c9e6850
  sp: 0x000000016c9e67f0

-- C level backtrace information -------------------------------------------
/opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/libruby.3.4.dylib(rb_vm_bugreport+0x344) [0x105218340]
/opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/libruby.3.4.dylib(rb_bug_for_fatal_signal) [0x1050b56f4]
/opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/libruby.3.4.dylib(sigill) [0x10519f918]
/usr/lib/system/libsystem_platform.dylib(_sigtramp+0x38) [0x1806bd7a4]
/opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/libruby.3.4.dylib(send_internal) [0x105211af8]
/opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/libruby.3.4.dylib(vm_call0_body) [0x1052113f0]
/opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/libruby.3.4.dylib(rb_funcallv_scope) [0x1051ff2c4]
/opt/homebrew/lib/ruby/gems/3.4.0/gems/gobject-introspection-4.3.6/lib/gobject_introspection.bundle(rb_gi_callback_invoke_without_protect+0x11c) [0x10c626628]
/opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/libruby.3.4.dylib(rb_protect) [0x1050bdfb4]
/opt/homebrew/lib/ruby/gems/3.4.0/gems/gobject-introspection-4.3.6/lib/gobject_introspection.bundle(rb_gi_callback_invoke+0x2c) [0x10c62644c]
/opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/libruby.3.4.dylib(rb_protect) [0x1050bdfb4]
/opt/homebrew/lib/ruby/gems/3.4.0/gems/glib2-4.3.6/lib/glib2.bundle(process_request+0x38) [0x10c4ce568]
/opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/libruby.3.4.dylib(thread_start_func_2) [0x1051d3ff0]
/opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/libruby.3.4.dylib(nt_start) [0x1051d3ca4]
/usr/lib/system/libsystem_pthread.dylib(_pthread_start+0x88) [0x1806b3c58]

-- Other runtime information -----------------------------------------------

* Loaded script: test/run-test.rb

* Loaded features:

    0 enumerator.so
    1 thread.rb
    2 fiber.so
    3 rational.so
    4 complex.so
    5 ruby2_keywords.rb
    6 /opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/ruby/3.4.0/arm64-darwin25/enc/encdb.bundle
    7 /opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/ruby/3.4.0/arm64-darwin25/enc/trans/transdb.bundle
    8 /opt/homebrew/Cellar/ruby@3.4/3.4.9/lib/ruby/3.4.0/arm64-darwin25/rbconfig.rb
...
 20001ab0000-20001bd0000 ---
20001bd0000-20008000000 rw-
20008000000-20010000000 rw-
20010000000-20018000000 rw-
20018000000-20020000000 rw-
20020000000-20028000000 rw-
20028000000-20030000000 rw-
20030000000-20038000000 rw-
20038000000-20040000000 rw-
[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.

ci/scripts/c_glib_test.sh: line 39: 45584 Bus error: 10              ruby test/run-test.rb
Error: Process completed with exit code 138.

See full log for more details.
This might be related to GitHub runners being updated to macos-26-arm64 instead of macos-15.

Component(s)

GLib, Ruby

[raulcd]

@kou should we try to pin macos-15 and create a new issue to add support for new runners?