unity-system-compositor crashed with SIGSEGV in std::_Hashtable<std::shared_ptr<mir::input::Device>, std::shared_ptr<mir::input::Device>, std::allocator<std::shared_ptr<mir::input::Device> >, std::__detail::_Identity, std::equal_to<std::shared_ptr<mir::input::Device> >, std::hash<std::shared_ptr<mir::input::Device> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >::~_Hashtable()

[felex]

I attempted to install unity8-desktop-session-mir through terminal. I did so then logged out. I selected unity8 as the window manager then logged in. It gave me a black session for a while so I pressed the power button which began to shut down. The shutdown process took much longer than usual, about 5 minutes. I powered my computer back on then switched back to the default unity 7 window manager and uninstalled unity8 for now.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: unity-system-compositor 0.4.2+16.04.20160219.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
Uname: Linux 4.4.0-15-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
Date: Mon Mar 28 02:39:05 2016
ExecutablePath: /usr/sbin/unity-system-compositor
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] RV730/M96 [Mobility Radeon HD 4650/5165] [1002:9480] (prog-if 00 [VGA controller])
   Subsystem: Dell RV730/M96 [Mobility Radeon HD 4650/5165] [1028:0447]
InstallationDate: Installed on 2016-03-28 (0 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
ProcCmdline: /usr/sbin/unity-system-compositor --file /run/lightdm-mir-0 --from-dm-fd 12 --to-dm-fd 21 --vt 8
ProcEnviron:

SegvAnalysis:
 Segfault happened at: 0x7f4a1589f291: mov 0x10(%rax),%rax
 PC (0x7f4a1589f291) ok
 source "0x10(%rax)" (0x7f4a089e6a70) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: unity-system-compositor
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libmirserver.so.38
 ?? ()
 std::_Hashtable<std::shared_ptr<mir::input::Device>, std::shared_ptr<mir::input::Device>, std::allocator<std::shared_ptr<mir::input::Device> >, std::__detail::_Identity, std::equal_to<std::shared_ptr<mir::input::Device> >, std::hash<std::shared_ptr<mir::input::Device> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >::~_Hashtable() ()
 usc::MirInputConfiguration::~MirInputConfiguration() ()
 std::_Sp_counted_ptr_inplace<usc::UnityInputService, std::allocator<usc::UnityInputService>, (__gnu_cxx::_Lock_policy)2>::_M_dispose() ()
Title: unity-system-compositor crashed with SIGSEGV in std::_Hashtable<std::shared_ptr<mir::input::Device>, std::shared_ptr<mir::input::Device>, std::allocator<std::shared_ptr<mir::input::Device> >, std::__detail::_Identity, std::equal_to<std::shared_ptr<mir::input::Device> >, std::hash<std::shared_ptr<mir::input::Device> >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, true, true> >::~_Hashtable()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

version.libdrm: libdrm2 2.4.67-1
version.lightdm: lightdm 1.18.0-0ubuntu1
version.mesa: libegl1-mesa-dev N/A

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1560382, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.