Description William Sjöblom 2022-04-26 16:11:02 CEST

Running the ThinLinc 4.14.0 server on a SLES12 VM I managed to get tl-mount-localdrives to hang during session startup. This issue seems very racy and temperamental as I've had a hard time reproducing it. Nonetheless, out of sheer luck, I managed to reproduce it while running inside of pdb and managed to obtain the following stack trace:

> (Pdb) bt
>   /usr/lib64/python3.4/runpy.py(170)_run_module_as_main()
> -> "__main__", mod_spec)
>   /usr/lib64/python3.4/runpy.py(85)_run_code()
> -> exec(code, run_globals)
>   /usr/lib64/python3.4/pdb.py(1688)<module>()
> -> pdb.main()
>   /usr/lib64/python3.4/pdb.py(1661)main()
> -> pdb._runscript(mainpyfile)
>   /usr/lib64/python3.4/pdb.py(1542)_runscript()
> -> self.run(statement)
>   /usr/lib64/python3.4/bdb.py(431)run()
> -> exec(cmd, globals, locals)
>   <string>(1)<module>()
>   /opt/thinlinc/bin/tl-mount-localdrives(9)<module>()
> -> if 82 - 82: Iii1i
>   /opt/thinlinc/bin/tl-mount-localdrives(327)OoOOooO0oOO0Oo()
> -> oo00 = OoOo ( "127.0.0.1" , i1iIIi1I1iiI )
>   /opt/thinlinc/bin/tl-mount-localdrives(97)__init__()
> -> self . mountcl . null ( )
>   /opt/thinlinc/bin/tl-mount-localdrives(71)null()
> -> self . make_call ( mount_const . MOUNTPROC3_NULL )
>   /opt/thinlinc/bin/tl-mount-localdrives(61)make_call()
> -> Iio0 , i1i = self . pipe . listen ( oOoo0 )
>   /opt/thinlinc/modules/thinlinc/rpc/rpc.py(375)listen()
> -> self._pending[xid].wait(timeout)
>   /opt/thinlinc/modules/thinlinc/rpc/rpc.py(150)wait()
> -> self._filled.wait(timeout)
>   /usr/lib64/python3.4/threading.py(546)wait()
> -> signaled = self._cond.wait(timeout)
> > /usr/lib64/python3.4/threading.py(290)wait()
> -> waiter.acquire()

The issue was observed with a fresh ThinLinc install on an otherwise clean system. Looking at the client and xinit logs, nothing looks out of the ordinary.