[Bug 1506358] Re: libmirclient gives up and exits prematurely with "std::exception::what: disconnected: no new buffers" via ExchangeSemantics::submit()

[Daniel van Vugt]

Naively I would like to know; if there are "no new buffers" and if
that's a blocker, then why is the client not just waiting for new
buffers? Dying instead seems like an overreaction.

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Title:
  libmirclient gives up and exits prematurely with
  "std::exception::what: disconnected: no new buffers" via
  ExchangeSemantics::submit()

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[Bug 1506358] Re: libmirclient gives up and exits prematurely with "std::exception::what: disconnected: no new buffers" via ExchangeSemantics::submit()

[Jean-Baptiste Lallement]

** Also affects: canonical-devices-system-image
   Importance: Undecided
   Status: New

** Changed in: canonical-devices-system-image
   Status: New => Confirmed

** Changed in: canonical-devices-system-image
   Importance: Undecided => Critical

** Changed in: canonical-devices-system-image
 Assignee: (unassigned) => kevin gunn (kgunn72)

** Changed in: canonical-devices-system-image
Milestone: None => ww04-2016

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Title:
  libmirclient gives up and exits prematurely with
  "std::exception::what: disconnected: no new buffers" via
  ExchangeSemantics::submit()

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[Bug 1506358] Re: libmirclient gives up and exits prematurely with "std::exception::what: disconnected: no new buffers" via ExchangeSemantics::submit()

[kevin gunn]

just a note that bug 1532607 has been made a duplicate of this.
there's quite a bit of traffic & information on bug 1532607

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Title:
  libmirclient gives up and exits prematurely with
  "std::exception::what: disconnected: no new buffers" via
  ExchangeSemantics::submit()

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[Bug 1506358] Re: libmirclient gives up and exits prematurely with "std::exception::what: disconnected: no new buffers" via ExchangeSemantics::submit()

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: xorg-server (Ubuntu)
   Status: New => Confirmed

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Title:
  libmirclient gives up and exits prematurely with
  "std::exception::what: disconnected: no new buffers" via
  ExchangeSemantics::submit()

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[Bug 1506358] Re: libmirclient gives up and exits prematurely with "std::exception::what: disconnected: no new buffers" via ExchangeSemantics::submit()

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: mir (Ubuntu)
   Status: New => Confirmed

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Title:
  libmirclient gives up and exits prematurely with
  "std::exception::what: disconnected: no new buffers" via
  ExchangeSemantics::submit()

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[Bug 1506358] Re: libmirclient gives up and exits prematurely with "std::exception::what: disconnected: no new buffers" via ExchangeSemantics::submit()

[Daniel van Vugt]

** Changed in: xorg-server (Ubuntu)
   Status: Confirmed => Invalid

** Changed in: mir
   Importance: High => Critical

** Changed in: mir (Ubuntu)
   Importance: High => Critical

** Changed in: mir
   Status: New => Confirmed

** Description changed:

  Under heavy resizing (stress testing under Valgrind), my Mir client
  (Xmir) crashed with:
  
  [1444895332.392862]  MirBufferStreamAPI: Caught exception at client 
library boundary (in mir_buffer_stream_swap_buffers): 
/build/mir-7io2Aj/mir-0.16.0+15.10.20150921.1/src/client/buffer_stream.cpp(169):
 Throw in function virtual MirWaitHandle* 
{anonymous}::ExchangeSemantics::submit(const std::function&, 
mir::geometry::Size, MirPixelFormat, int)
  Dynamic exception type: 
boost::exception_detail::clone_impl
  std::exception::what: disconnected: no new buffers
  
  The strange thing is it's only the client that died. The server survived
  and I can connect new clients to it.
+ 
+ Duplicate bug reports now show Unity8 is another such client suffering
+ from this crash. It's occurring on phones in the wild.

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Title:
  libmirclient gives up and exits prematurely with
  "std::exception::what: disconnected: no new buffers" via
  ExchangeSemantics::submit()

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[Bug 1506358] Re: libmirclient gives up and exits prematurely with "std::exception::what: disconnected: no new buffers" via ExchangeSemantics::submit()

[Daniel van Vugt]

** Changed in: xorg-server (Ubuntu)
   Importance: Undecided => High

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Title:
  libmirclient gives up and exits prematurely with
  "std::exception::what: disconnected: no new buffers" via
  ExchangeSemantics::submit()

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[Bug 1506358] Re: libmirclient gives up and exits prematurely with "std::exception::what: disconnected: no new buffers" via ExchangeSemantics::submit()

[Daniel van Vugt]

It appears the problem happens when the cursor is right on the corner of
the window during rapid resize. Sometimes it escapes/enters the window
during this time, which causes Xmir to innocently
mir_buffer_stream_release_sync() the cursor, and the libmirclient dies:

==8162== Process terminating with default action of signal 6 (SIGABRT)
==8162==at 0x6F7C267: raise (raise.c:55)
==8162==by 0x6F7DEC9: abort (abort.c:89)
==8162==by 0x7F20B7C: __gnu_cxx::__verbose_terminate_handler() (in 
/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21)
==8162==by 0x7F1E9C5: ??? (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21)
==8162==by 0x7F1EA10: std::terminate() (in 
/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21)
==8162==by 0x7F1EC78: __cxa_rethrow (in 
/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21)
==8162==by 0x531D26D: 
mir::client::rpc::MirProtobufRpcChannel::send_message(mir::protobuf::wire::Invocation
 const&, mir::protobuf::wire::Invocation const&, std::vector&) (mir_protobuf_rpc_channel.cpp:238)
==8162==by 0x531CFB8: 
mir::client::rpc::MirProtobufRpcChannel::call_method(std::__cxx11::basic_string const&, 
google::protobuf::MessageLite const*, google::protobuf::MessageLite*, 
google::protobuf::Closure*) (mir_protobuf_rpc_channel.cpp:210)
==8162==by 0x531B459: 
mir::client::rpc::DisplayServer::release_buffer_stream(mir::protobuf::BufferStreamId
 const*, mir::protobuf::Void*, google::protobuf::Closure*) 
(mir_display_server.cpp:127)
==8162==by 0x52A04B3: 
MirConnection::release_buffer_stream(mir::client::ClientBufferStream*, void 
(*)(MirBufferStream*, void*), void*) (mir_connection.cpp:655)
==8162==by 0x52F295C: mir::client::BufferStream::release(void 
(*)(MirBufferStream*, void*), void*) (buffer_stream.cpp:630)
==8162==by 0x53003E3: mir_buffer_stream_release 
(mir_buffer_stream_api.cpp:91)

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Title:
  libmirclient gives up and exits prematurely with
  "std::exception::what: disconnected: no new buffers" via
  ExchangeSemantics::submit()

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