So, just so this is not forgotten, the current understanding after some debugging together yesterday is that we may reach the call to Invalidate() here on a task that may have already been deleted by the task manager. One of our hypothesis is that a task being executed finishes roughly at the same time as it times out. The suggested fix is to put Invalidate() in the destructor of XrdCl::TickGeneratorTask, so that it gets called by UnregisterTask, which is protected by a lock.

@abh, this might be worth looking to let us know if you agree with the assessment above or not.

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