Issue #19543 has been updated by hanazuki (Kasumi Hanazuki). patch https://github.com/ruby/ruby/pull/7569 ---------------------------------------- Bug #19543: Resizing IO::Buffer to zero bytes fails https://bugs.ruby-lang.org/issues/19543#change-102477 * Author: hanazuki (Kasumi Hanazuki) * Status: Open * Priority: Normal * ruby -v: ruby 3.3.0dev (2023-03-20T04:02:21Z master 7f696b8859) [x86_64-linux] * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- ``` irb(main):001:0> IO::Buffer.new(1).resize(0) /home/kasumi/.local/src/github.com/ruby/ruby/-e:1: warning: IO::Buffer is experimental and both the Ruby and C interface may change in the future! /home/kasumi/.local/src/github.com/ruby/ruby/-e:1: [BUG] rb_sys_fail(rb_io_buffer_resize:realloc) - errno == 0 ruby 3.3.0dev (2023-03-20T04:02:21Z master 7f696b8859) [x86_64-linux] # full trace is attached to this ticket ``` `IO::Buffer#resize(0)` will result in calling `realloc(data->base, size)` with size = 0 in [rb_io_buffer_resize](https://bugs.ruby-lang.org/projects/ruby-master/repository/git/revisions/7f6...). Zero-sized `realloc` is deprecated in C (and will be UB in C23). ---Files-------------------------------- bug.txt (40 KB) -- https://bugs.ruby-lang.org/