Bug #12278: Sometimes I have segmentation fault with procs reducer

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
• Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN

[newmen (Gleb Averchuk)]

Hello,

Sometimes I have segmentation fault for code like:

  # /Users/newmen/projects/versatile-diamond/analyzer/lib/modules/procs_reducer.rb:35

  8 # Combines passed procs to one function
  9 # @param [Array] procs which will be combined
 10 # @yield returns heart of combination result
 11 # @return [Proc] the general function which contains calls of all other nested
 12 def reduce_procs(procs, &deepest_block)
 13   procs.reverse.reduce(deepest_block) do |acc, block|
 14     -> { block[&acc] }
 15   end
 16 end
 17
 18 # Calls combined procs as one function
 19 # @param [Array] procs which will be combined
 20 # @yield returns heart of combination result
 21 # @return [Object]
 22 def call_procs(procs, &block)
 23   reduce_procs(procs, &block).call
 24 end
 25
 26 # Collects procs which nests each other, after than calls combined procedure
 27 # @param [Proc] deepest_block the block for the deepest call
 28 # @yield [Symbol, Array, Hash] nests the some method call
 29 # @return [Object] the result of deepest block call
 30 def inlay_procs(deepest_block, &block)
 31   procs = []
 32   nest = -> method_name, *args, **kwargs do
 33     procs <<
 34       if kwargs.empty?
 35         -> &prc { send(method_name, *args, &prc) }
 36       else
 37         -> &prc { send(method_name, *args, **kwargs, &prc) }
 38       end
 39   end
 40
 41   block[nest]
 42   call_procs(procs, &deepest_block)
 43 end

Console report and crash log files are attached.
Both attached source files were written about 2 years ago.

[nobu (Nobuyoshi Nakada)]

Seems a GC bug of a Proc created by Symbol#to_proc.
I suspect that it is a fixed bug, but can't find the ticket now.

[windwiny (wind winy)]

Did you had use jemalloc compile ruby?

[newmen (Gleb Averchuk)]

wind winy wrote:

Did you had use jemalloc compile ruby?

I've installed Ruby using RVM

[ko1 (Koichi Sasada)]

Do you have easy reproducible code which we can try?

[newmen (Gleb Averchuk)]

• Subject changed from Sometimes I have segmentation fault with props reducer to Sometimes I have segmentation fault with procs reducer

[newmen (Gleb Averchuk)]

Koichi Sasada wrote:

Do you have easy reproducible code which we can try?

The error has occurred suddenly everytime. Almost always, I got it during RSpec tests run.
Before, I was not able to write a simple example for provoke an error. Also, I have noted that on 2.2.4 the error does not occur, and since then I use it. But now, following your request, I will continue to use 2.3.0 intentionally to catch the error and extract the simple reproducing code. I'll let you know if I will find it.

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Closed