** Branch linked: lp:~ci-train-bot/mir/mir-ubuntu-zesty-2600
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https://bugs.launchpad.net/bugs/1664760
Title:
Mir server crashed with SIGSEGV in
mir::compositor::TemporaryBuffer::size() called from
mir::gl::tessellate_renderable_into_rectangle()
Status in Mir:
Fix Committed
Status in Mir 0.26 series:
Fix Committed
Status in mir package in Ubuntu:
Triaged
Bug description:
I run mir exempla:
./bin/mir_demo_server --launch-client ./bin/mir_demo_client_multistrea
mir_demo_server crash when I move central animated object to right border and
back.
Cause of crash is to call size() function from invalid pointer in
temporaty_buffers.cpp mc::TemporaryBuffer::size() - line: return
buffer->size();
I have checked why pointer is invalid:
In function:
std::shared_ptr<mg::Buffer>
mc::MultiMonitorArbiter::compositor_acquire(compositor::CompositorID id) from
multi_monitor_arbiter.cpp
auto& last_entry = onscreen_buffers.front();
last_entry.use_count++;
if (mode == mc::MultiMonitorMode::multi_monitor_sync)
clean_onscreen_buffers(lk);
last_entry reference pointing not existing object (object is not longer in
onscreen_buffers) after calling clean_onscreen_buffers() function.
clean_onscreen_buffers() function looks correct for me - but after calling
it, data remains inconsistent.
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