[Bug runtime/21860] on rawhide, the bz1027459.exp test case causes a kernel warning

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21860

--- Comment #2 from David Smith <dsmith at redhat dot com> ---
This appears to be coming from stp_print_flush (runtime/print_flush.c). Lines
131+ look like this:

                c = _stp_runtime_entryfn_get_context();                         

                dbug_trans(1, "calling _stp_data_write...\n");                  
                stp_spin_lock_irqsave(&_stp_print_lock, flags);                 
                while (len > 0) {                                               

The warning seems to come from the call to stp_spin_lock_irqsave(). I'm still
unsure of why the warning happens.

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