From: jean.boussier@...
Date: 2020-03-09T12:29:13+00:00
Subject: [ruby-core:97417] [Ruby master Bug#16682] Ruby 2.7.0p0 crash on exit if there is an active RUBY_INTERNAL_EVENT_GC_EXIT tracepoint

Issue #16682 has been updated by byroot (Jean Boussier).


I patched my ruby to print the exception message before it tries to allocate, and ran it a few times:

```
.wrong argument type 140351662971400
                                     (expected tracepoint)

.wrong argument type 140321405262280
                                     (expected tracepoint)

.wrong argument type 140682039908840
                                     (expected tracepoint)

.wrong argument type 140494755846600
                                     (expected tracepoint)

.wrong argument type 140445212727760
                                     (expected tracepoint)

.wrong argument type 140449339922920
                                     (expected tracepoint)
```

----------------------------------------
Bug #16682: Ruby 2.7.0p0 crash on exit if there is an active RUBY_INTERNAL_EVENT_GC_EXIT tracepoint
https://bugs.ruby-lang.org/issues/16682#change-84550

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin19]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
```
[BUG] object allocation during garbage collection phase
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin19]

-- 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:0001 s:0003 E:002690 (none) [FINISH]


-- C level backtrace information -------------------------------------------
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(rb_vm_bugreport+0x96) [0x10fa9f266]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(rb_bug+0xcc) [0x10faabb86]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(newobj_slowpath+0x99c) [0x10f8f939c]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(newobj_slowpath_wb_protected+0x14) [0x10f8f89d4]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(rb_str_buf_new+0x1e) [0x10fa151be]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(rb_enc_vsprintf+0x48) [0x10fa03178]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(rb_vraise+0x14) [0x10f8d4d84]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(rb_raise+0x7b) [0x10f8d052b]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(rb_check_typeddata+0xf3) [0x10f8d19a3]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(tp_call_trace+0x2a) [0x10faa1aaa]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(rb_exec_event_hooks+0x163) [0x10faa0ab3]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(rb_objspace_call_finalizer+0x8b7) [0x10f8eded7]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(rb_ec_cleanup+0x2de) [0x10f8dc35e]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(ruby_run_node+0x5f) [0x10f8dc4ff]
/Users/byroot/.rubies/ruby-2.7.0/bin/ruby(main+0x5d) [0x10f833d0d]
```

It also crash in other circumstances, but I'm not able to reproduce them as easily.

Older versions are not affected.

I created a repository to easily reproduce the issue: https://github.com/casperisfine/ruby-tracepoint-crash



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