[ruby-core:101975] [Ruby master Bug#17516] forking in a ractor causes Ruby to crash

Issue #17516 has been updated by pkmuldoon (Phil Muldoon).


I'm wondering if we can limit Process calls in the ractor as we do for accessing out of band variables? I've not had a chance to attach GDB to the Ruby VM yet (I have to compile Ruby with -O0 -g3 for things to be clear).

BTW I'm not suggesting anyone every do that code snippet in the original post! It's somewhat of a theoretical testcase. But the Ruby interpreter shouldn't crash either :thinking face:

----------------------------------------
Bug #17516: forking in a ractor causes Ruby to crash
https://bugs.ruby-lang.org/issues/17516#change-89827

* Author: pkmuldoon (Phil Muldoon)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin20]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
I just want to point out, there's absolutely no reason to do this, but

r = Ractor.new do
   Process.fork()
end

Will cause:

<internal:ractor>:267: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues.
[BUG] rb_thread_terminate_all: called by child thread (0x0000700004ddca40, 0x00007f981b567ee0)
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin20]

-- Crash Report log information --------------------------------------------
   See Crash Report log file under the one of following:
     * ~/Library/Logs/DiagnosticReports
     * /Library/Logs/DiagnosticReports
   for more details.
Don't forget to include the above Crash Report log file in bug reports.

-- Control frame information -----------------------------------------------
c:0001 p:---- s:0003 e:000002 (none) [FINISH]


-- C level backtrace information -------------------------------------------
=> #<Ractor:#3 (pry):5 terminated>
[4] pry(main)> /Users/phillipmuldoon/.rubies/ruby-3.0.0/bin/ruby(rb_vm_bugreport+0x6cf) [0x103084d1f]
/Users/phillipmuldoon/.rubies/ruby-3.0.0/bin/ruby(rb_bug_without_die+0x206) [0x102e9e2b6]
/Users/phillipmuldoon/.rubies/ruby-3.0.0/bin/ruby(rb_bug+0x71) [0x103091e6b]
/Users/phillipmuldoon/.rubies/ruby-3.0.0/bin/ruby(rb_thread_terminate_all+0x329) [0x10301e5b9]
/Users/phillipmuldoon/.rubies/ruby-3.0.0/bin/ruby(rb_ractor_terminate_all+0xa3) [0x102f8acc3]
/Users/phillipmuldoon/.rubies/ruby-3.0.0/bin/ruby(rb_ec_cleanup+0x229) [0x102ea9299]
/Users/phillipmuldoon/.rubies/ruby-3.0.0/bin/ruby(ruby_stop+0x9) [0x102ea9509]
/Users/phillipmuldoon/.rubies/ruby-3.0.0/bin/ruby(thread_start_func_2+0x8ce) [0x103027fce]
/Users/phillipmuldoon/.rubies/ruby-3.0.0/bin/ruby(thread_start_func_1+0x10d) [0x10302753d]
/usr/lib/system/libsystem_pthread.dylib(_pthread_start+0xe0) [0x7fff20382950]

---Files--------------------------------
ruby_2021-01-06-104315_phillip-muldoon-FA588.crash (31.8 KB)


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