[ruby-core:54432] [ruby-trunk - Feature #6216] SystemStackError backtraces should not be reduced to one line

Issue #6216 has been updated by drkaes (Stefan Kaes).


It has been pointed out to me that the patched ruby will likely crash when the patched code run on a sigaltstack.

I'm working to sort this out.
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Feature #6216: SystemStackError backtraces should not be reduced to one line
https://bugs.ruby-lang.org/issues/6216#change-38709

Author: postmodern (Hal Brodigan)
Status: Assigned
Priority: Normal
Assignee: ko1 (Koichi Sasada)
Category: core
Target version: next minor


When debugging "SystemStackError: stack level too deep" exceptions, it is not helpful that the backtrace is reduced to one single line. Most of the time Ruby incorrectly identifies where cycles begin, resulting in an unrelated "file:line" as the backtrace. A more useful behaviour would be to print the last 30 lines of the backtrace, and have the developer identify which "file:line" is causing the cycle. This is similar to how JRuby handles SystemStackError backtraces.


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