uxioserv crashes while launching uxtrace / uxiotrclck

Document ID : KB000110080
Last Modified Date : 08/08/2018
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The uxioserv process crashes when generating an uxtrace or launching manually the command uxiotrclck.
The issue is very rare and almost impossible to reproduce.
In the IO*dump.log the following kind of trace appear:

|TRACE|X|IO |pid=p.t| u_trace_lock_clients     | Locking client list...
|FATAL|X|IO |pid=p.t| k_process_signal        | *** execution handler: SIGNAL=(11) PID=(x) PPID=(y) GPID=(z)

All OS
A problem has been fixed where the uxiotrclck command causes a crash of IO server due to a concurrency issue. The issue is not systematic.
Update to a fix version listed below or a newer version if available.

Fix version(s): 
Component: Application.Server
Dollar Universe 6.9.41 - Released End of September 2018