[Bug python/28352] New: Assertion failure when using Python exit event handler: ../../gdb/thread.c:95: internal-error: thread_info* inferior_thread(): Assertion `current_thread_ != nullptr' failed.

[Bug python/28352] New: Assertion failure when using Python exit event handler: ../../gdb/thread.c:95: internal-error: thread_info* inferior_thread(): Assertion `current_thread_ != nullptr' failed.

[parke.nexus at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28352

            Bug ID: 28352
           Summary: Assertion failure when using Python exit event
                    handler: ../../gdb/thread.c:95: internal-error:
                    thread_info* inferior_thread(): Assertion
                    `current_thread_ != nullptr' failed.
           Product: gdb
           Version: 10.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: parke.nexus at gmail dot com
  Target Milestone: ---

When using a Python exit_handler, I encountered the following error.

To reproduce on Arch Linux:

$  gdb  --version
GNU gdb (GDB) 10.2
[snip]

$  gdb  -q  -ex run  /bin/true
Reading symbols from /bin/true...
(No debugging symbols found in /bin/true)
Starting program: /usr/bin/true 
[Inferior 1 (process 339) exited normally]
../../gdb/thread.c:95: internal-error: thread_info* inferior_thread():
Assertion `current_thread_ != nullptr' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.

This is a bug, please report it.  For instructions, see:
<https://www.gnu.org/software/gdb/bugs/>.

Aborted (core dumped)

$  cat  ~/.gdbinit
define  hook-quit
  set  confirm  off
end

python

def  exit_handler  ( event ):
  if  hasattr ( event, 'exit_code' )  and  event .exit_code == 0:
    gdb .execute ( "quit" )

gdb .events .exited .connect ( exit_handler )

end

----

I encounter a similar bug on Ubuntu 20.04.  Same ~/.gdbinit as above.  Same
steps to reproduce.  A different assertion fails.

$  gdb --version
GNU gdb (Ubuntu 9.2-0ubuntu1~20.04) 9.2
[snip]

$  gdb  -q  -ex run  /bin/true
Reading symbols from /bin/true...
(No debugging symbols found in /bin/true)
Starting program: /usr/bin/true 
[Inferior 1 (process 4134946) exited normally]
/build/gdb-OxeNvS/gdb-9.2/gdb/inferior.c:283: internal-error: inferior*
find_inferior_pid(int): Assertion `pid != 0' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.

This is a bug, please report it.  For instructions, see:
<http://www.gnu.org/software/gdb/bugs/>.

Aborted (core dumped)

Possibly related:
https://sourceware.org/bugzilla/show_bug.cgi?id=26761
https://sourceware.org/bugzilla/show_bug.cgi?id=27682

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