Bug #19880: Missing write barrier in iseq instruction list

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 3.0: UNKNOWN, 3.1: DONE, 3.2: DONE

[peterzhu2118 (Peter Zhu)]

There's a missing write barrier for operands in the iseq instruction list, which can cause crashes. This bug has been fixed in commit b3b57f7.

It can be reproduced when Ruby is compiled with -DRUBY_DEBUG_ENV=1. Using the following command:

RUBY_GC_HEAP_OLDOBJECT_LIMIT_FACTOR=0 RUBY_DEBUG=gc_stress ruby -w --disable=gems -Itool/lib -W0 test.rb

The following script crashes:

require "test/unit"

I have backports for Ruby 3.1 and Ruby 3.2 available here:

3.1: https://github.com/ruby/ruby/pull/8430
3.2: https://github.com/ruby/ruby/pull/8431

[peterzhu2118 (Peter Zhu)]

• Status changed from Open to Closed

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: REQUIRED to 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: DONE

Merged into ruby_3_2 at https://github.com/ruby/ruby/commit/a7335e11e354d1ee2e15233f32f087230069ad5c.

[usa (Usaku NAKAMURA)]

• Backport changed from 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: DONE to 3.0: UNKNOWN, 3.1: DONE, 3.2: DONE

ruby_3_1 e031eff34387f300be27c24a725ddaa17f18f7e3.