ruby.git/test/-ext-/test_bug-14834.rb, branch v4.0.4 The Ruby Programming Language fix tracepoint + backtrace SEGV 2019-08-01T07:00:59+00:00 卜部昌平 shyouhei@ruby-lang.org 2019-07-31T14:00:15+00:00 5d33f787169bcc3594d2264726695d58c4a06899 PC modification in gc_event_hook_body was careless. There are (so to say) abnormal iseqs stored in the cfp. We have to check sanity before we touch the PC. This has not been fixed because there was no way to (ab)use the setup from pure-Ruby. However by using our official C APIs it is possible to touch such frame(s), resulting in SEGV. Fixes [Bug #14834]. 
PC modification in gc_event_hook_body was careless.  There are (so
to say) abnormal iseqs stored in the cfp.  We have to check sanity
before we touch the PC.

This has not been fixed because there was no way to (ab)use the
setup from pure-Ruby.  However by using our official C APIs it is
possible to touch such frame(s), resulting in SEGV.

Fixes [Bug #14834].