[Bug nptl/21032] New: pthread_key_create() destructors and DSO unloading

[leo at yuriev dot ru]

https://sourceware.org/bugzilla/show_bug.cgi?id=21032

            Bug ID: 21032
           Summary: pthread_key_create() destructors and DSO unloading
           Product: glibc
           Version: 2.24
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: unassigned at sourceware dot org
          Reporter: leo at yuriev dot ru
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

The pthread_key_create() and __nptl_deallocate_tsd() do not track the
references to destructor's DSO like the __cxa_thread_atexit_impl().

Therefore the DSO, which holds a destructor's code, could be unloaded before
destructor execution or before deleting a corresponding key.

So in a complex environment there is no way to know whether it is safe to
unload a particular DSO or some tls-destructors are still left.

Suggest this should be fixed or documented, e.g. that the pthread_create_key()
with a destructor should not be used from lib.so.

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