Issue #12305 has been updated by eramsey (Eric Ramsey).


Was there any resolution to this issue? We are encountering the same issue now that we have upgraded our Ruby from 2.1.6 to 2.3.3. This happens randomly throughout our framework when we are trying to run regression. 

Any and all information as to where to look and or how to fix would be greatly appreciated. 

----------------------------------------
Bug #12305: "can't remove str from str_id" at unregister_sym
https://bugs.ruby-lang.org/issues/12305#change-71638

* Author: ks (Konstantin Starodubtsev)
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-linux]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
I'm experiencing random occurrences of "can't remove str from str_id" crash.

Message string looks like this one:

```
/srv/sim/.rvm/gems/ruby-2.3.0@env-manager/gems/mongo-2.2.4/lib/mongo/server/description.rb:508: [BUG] 0x007f4f400ab310 can't remove str from str_id (`..dO.)
```

The only constant thing in it is the "can't remove str from str_id" substring. Other things like address, source code location or symbol string value in brackets differ between crash reports (see attachments).

In a C level backtrace information the only common part is top of a trace:

```
-- C level backtrace information -------------------------------------------
/srv/sim/.rvm/rubies/ruby-2.3.0/lib/libruby.so.2.3(rb_vm_bugreport+0x51f) [0x7f4f8b0106ff] vm_dump.c:688
/srv/sim/.rvm/rubies/ruby-2.3.0/lib/libruby.so.2.3(rb_bug+0xcf) [0x7f4f8ae9a01f] error.c:420
/srv/sim/.rvm/rubies/ruby-2.3.0/lib/libruby.so.2.3(unregister_sym.part.12+0x20) [0x7f4f8ae4aada] symbol.c:399
/srv/sim/.rvm/rubies/ruby-2.3.0/lib/libruby.so.2.3(rb_gc_free_dsymbol+0x62) [0x7f4f8afa56a2] symbol.c:637
/srv/sim/.rvm/rubies/ruby-2.3.0/lib/libruby.so.2.3(gc_sweep_step+0x621) [0x7f4f8aec0d01] gc.c:2211
/srv/sim/.rvm/rubies/ruby-2.3.0/lib/libruby.so.2.3(heap_get_freeobj_from_next_freepage+0x72) [0x7f4f8ae498c3] gc.c:3624
/srv/sim/.rvm/rubies/ruby-2.3.0/lib/libruby.so.2.3(newobj_slowpath_wb_protected+0xf4) [0x7f4f8aec43d4] gc.c:1679

We hit this bug at least once per day, so should you need any other information, let me know.
```

Attached are three full [BUG] reports for three different occurrences.



---Files--------------------------------
report-01.log (247 KB)
report-03.log (251 KB)
report-02.log (266 KB)


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