[ruby-core:114753] [Ruby master Bug#9115] Logger traps all exceptions; breaks Timeout

Issue #9115 has been updated by mame (Yusuke Endoh).


Discussed at the dev meeting.

* It is clear that Logger has the intention not to interfere with the execution of the application on a log write failure.
* On the other hand, it is also clear that Logger is not considering about asynchronous exceptions.

As a better-than-nothing mitigation, it is proposed to enclose the entire `Logger::LogDevice#write` in `Thread.handle_interrupt(:never) { ... }`.
It could be a problem if the method takes a very long time because `Timeout.timeout` cannot interrupt the execution, but such a case will be rare (hopefully).

What exception `Timeout.timeout` raises is user-configurable, so it would be difficult to reraise only a specific exception class.

It is ultimately up to the maintainer, @sonots, to decide.

----------------------------------------
Bug #9115: Logger traps all exceptions; breaks Timeout
https://bugs.ruby-lang.org/issues/9115#change-104590

* Author: cphoenix (Chris Phoenix)
* Status: Assigned
* Priority: Normal
* Assignee: sonots (Naotoshi Seo)
* ruby -v: ruby 2.0.0p247 (2013-06-27) [i386-mingw32]
----------------------------------------
Line 577-579 of logger.rb

      rescue Exception => ignored
        warn("log writing failed. #{ignored}")
      end

Thus, when the system times out in the middle of writing a log message, it warns "log writing failed. execution expired" and just keeps right on running.

This is true in 1.9.3 as well. I haven't looked at older versions.

Pardon me while I go grep "rescue Exception" in the entire Ruby codebase, and see whether I can reliably use Timeout at all...

OK, you might check out C:\Ruby200\lib\ruby\gems\2.0.0\gems\activerecord-3.2.13\lib\active_record\railties\databases.rake

All the other "rescue Exception" seem to re-raise it, except maybe C:\Ruby200\lib\ruby\2.0.0\xmlrpc\server.rb and C:\Ruby200\lib\ruby\gems\2.0.0\gems\activesupport-3.2.13\lib\active_support\callbacks.rb





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