UI frozen and running at 100% CPU

[Pat McGowan]

Mako running u15
Was on the music scope, device suspended, when resumed the UI was frozen.

Backtrace from gdb

0 0xb6444032 in epoll_wait () from /lib/arm-linux-gnueabihf/libc.so.6
#1 0xb4446bd2 in boost::asio::detail::epoll_reactor::run(bool, boost::asio::detail::op_queue<boost::asio::detail::task_io_service_operation>&) ()
   from /usr/lib/arm-linux-gnueabihf/libmirserver.so.19
#2 0xb4448976 in boost::asio::detail::task_io_service::run(boost::system::error_code&) () from /usr/lib/arm-linux-gnueabihf/libmirserver.so.19
#3 0xb4445b14 in mir::AsioMainLoop::run() ()
   from /usr/lib/arm-linux-gnueabihf/libmirserver.so.19
#4 0xb44413d2 in mir::DisplayServer::run() ()
   from /usr/lib/arm-linux-gnueabihf/libmirserver.so.19
#5 0xb443f7e8 in mir::run_mir(mir::ServerConfiguration&, std::function<void (mir::DisplayServer&)>) () from /usr/lib/arm-linux-gnueabihf/libmirserver.so.19
#6 0xb452a8c6 in QMirServer::runWithClient(std::function<int (int, char const**, ShellServerConfiguration*)>) ()
   from /usr/lib/arm-linux-gnueabihf/libunity-mir.so.1
#7 0xb452aa28 in runQMirServerWithClient ()
   from /usr/lib/arm-linux-gnueabihf/libunity-mir.so.1
#8 0x0000b1f2 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb)

[Michał Sawicz (saviq)]

I'm afraid there's nothing useful to be seen here. It's just Mir's main loop, and there's nothing to say that's what was spinning.

We'll have to come up with a plan to gather some profiling data from a spinning process, I'll try and get that done soon.

[Michał Sawicz (saviq)]

Please post if you can find a way to reproduce, though.

[Albert Astals Cid (aacid)]

Next time also do
  thread apply all bt
in gdb to get the backtrace of all threads and not only Mir's main loop

[Launchpad Janitor (janitor)]

[Expired for unity8 (Ubuntu) because there has been no activity for 60 days.]