Bug #16849: ObjectSpace.trace_object_allocations_stop fails if called before ObjectSpace.trace_object_allocations_start

• Status: Open
• Priority: Normal
• Assignee: -
• Target version: -
• ruby -v: 2.3.0 2.7.1
• Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN

[byroot (Jean Boussier)]

The error is easy to reproduce:

e.g. on Ruby 2.3:

$ ruby -robjspace -e 'ObjectSpace.trace_object_allocations_stop'
-e:1:in `trace_object_allocations_stop': wrong argument type false (expected tracepoint) (TypeError)
    from -e:1:in `<main>'

Up to ruby 2.7.1:

$ ruby -robjspace -e 'ObjectSpace.trace_object_allocations_stop'
Traceback (most recent call last):
    1: from -e:1:in `<main>'
-e:1:in `trace_object_allocations_stop': wrong argument type false (expected tracepoint) (TypeError)

I have patch for it: https://github.com/ruby/ruby/pull/3001/files