Re: GDB hangs when calling inferior functions

Stephen Roberts <[email protected]> writes:

> I've included a gdb testcase below - hopefully this format is acceptable. This testcase reproduces the issue around 99% of the time on my ubuntu 16.04 machine. This figure drops closer to 50% when under heavy load, which suggested a race condition. I dug deeper into this and found that the threads which hang  are always ones which did not hit the breakpoint but were stopped when another thread did hit a breakpoint. Threads which are stopped at breakpoints are immune to this issue. Loading the system allows more threads to reach the breakpoint before they are stopped by gdb. 

I can reproduce the hang with your test case.  Looks
inferior_event_handler (INF_EXEC_COMPLETE, ) should be called somewhere,
may be in infrun or the thread finite-state machine is in a wrong state
for inferior call.

-- 
Yao (齐尧)