Bug #17507
Updated by byteit101 (Patrick Plenefisch) almost 4 years ago
Same behavior from 2.6-3.0
OS: Debian 10
Ruby Script:
``` ruby
TargetStr = "a-x-foo-bar-baz-z-b"
worker = lambda do
# For more hits, use File.read here instead of TargetStr
m = TargetStr.match(/foo-([A-Za-z0-9_\.]+)-baz/) # more cases in the []+ means more hits
raise "Error, #{m.inspect}" if m[1].nil?
File.exist? "/tmp"
TargetStr.gsub(/foo-bar-baz/, "foo-abc-baz") # must match the same as the first match
end
def threaded_test(worker)
6.times.map {Thread.new {10_000.times {worker.call}}}.each(&:join)
end
threaded_test(worker) # must be a function calling a block or proc or lambda. Change any of that and it doesn't hit this
puts "No Error Hits"
```
Result of script (number of exceptions varies per-run):
```
#<Thread:0x00005616663dba08 bug.rb:12 run> terminated with exception (report_on_exception is true):
bug.rb:6:in `block in <main>': Error, #<MatchData "foo-bar-baz"> (RuntimeError)
from bug.rb:12:in `block (3 levels) in threaded_test'
from bug.rb:12:in `times'
from bug.rb:12:in `block (2 levels) in threaded_test'
#<Thread:0x00005616663db5f8 bug.rb:12 run> terminated with exception (report_on_exception is true):
bug.rb:6:in `block in <main>': Error, #<MatchData "foo-bar-baz"> (RuntimeError)
from bug.rb:12:in `block (3 levels) in threaded_test'
from bug.rb:12:in `times'
from bug.rb:12:in `block (2 levels) in threaded_test'
#<Thread:0x00005616663dbb98 bug.rb:12 run> terminated with exception (report_on_exception is true):
bug.rb:6:in `block in <main>': Error, #<MatchData "foo-bar-baz"> (RuntimeError)
from bug.rb:12:in `block (3 levels) in threaded_test'
from bug.rb:12:in `times'
from bug.rb:12:in `block (2 levels) in threaded_test'
bug.rb:6:in `block in <main>': Error, #<MatchData "foo-bar-baz"> (RuntimeError)
from bug.rb:12:in `block (3 levels) in threaded_test'
from bug.rb:12:in `times'
from bug.rb:12:in `block (2 levels) in threaded_test'
```
Expected Result:
```
No Error Hits
```
Details:
As is, it usually errors (most of the time it fails about 300-500 iterations in)
A success is what is expected, m == #<MatchData #<MatchData "foo-bar-baz" 1:"bar">
An error is when m == #<MatchData #<MatchData "foo-bar-baz"> (no capture saved)
* If threaded_test is only one thread (1.times) it always works. For more than one thread, it usually errors.
* If File.exist? is removed, it always works.
* If the gsub is removed, it always works.
* If the gsub is changed to not match the match() call, it always works.
* If the match expression is simpler (/foo-(bar)-baz/, or even /foo-([a-z]+)-baz/), it usually works.
* If the threaded_test is not a method, but executed inline (ie, comment out the def, end, call, on lines 11 & 13-14) it always works.
* If worker is a block, or a lambda (as provided), it usually errors.
* If worker is put inline into the 10_000.times call, it always works.
* If TargetStr matches on index 0, it always works.