And remove the workaround I was trying, as this logging may prove what
the actual issue is.
Which I think is that the thread plan map in Process is cleared before
the threads are destroyed. So Thread::ShouldStop could be getting
the current plan, then the plan map is cleared, then Thread::ShouldStop
is deciding based on that plan to pop a plan from the now empty stack.
This reverts commit 481bb62e50317cf20df9493aad842790162ac3e7 and
71b4d7498ffecca5957fa0a63b1abf141d7b8441, along with the logging
and assert I had added to the test previously.
Now that I've caught it failing on Arm:
https://lab.llvm.org/buildbot/#/builders/17/builds/46598
Now I have enough to investigate, skip the test on the effected
platforms while I do that.
This reverts commit 35dacf2f51af251a74ac98ed29e7c454a619fcf1.
And relands the original change with two additions so I can debug the failure on Arm/AArch64:
* Enable lldb step logging in the tests.
* Assert that the current plan is not the base plan at the spot I believe is calling PopPlan.
These will be removed and replaced with a proper fix once I see some failures on the bots,
I couldn't reproduce it locally.
(also, no sign of it on the x86_64 bot)
When you debug a binary and the change & rebuild and then rerun in lldb
w/o quitting lldb, the Modules in the Global Module Cache for the old
binary & .o files if used are now "unreachable". Nothing in lldb is
holding them alive, and they've already been unlinked. lldb will
properly discard them if there's not another Target referencing them.
However, this only works in simple cases at present. If you have several
Targets that reference the same modules, it's pretty easy to end up
stranding Modules that are no longer reachable, and if you use a
sequence of SBDebuggers unreachable modules can also get stranded. If
you run a long-lived lldb process and are iteratively developing on a
large code base, lldb's memory gets filled with useless Modules.
This patch adds a test for the mode that currently works:
(lldb) target create foo
(lldb) run
<rebuild foo outside lldb>
(lldb) run
In that case, we do delete the unreachable Modules.
The next step will be to add tests for the cases where we fail to do
this, then see how to safely/efficiently evict unreachable modules in
those cases as well.
