Tested aethercast today on krillin ( rc-proposed, #200 ).
First, it's taken me a little while to figure out how to use the Miracast feature on my TV ( a LG SmartTV ). I had been using Settings::Network::WiFiDirect to enable it, but turns out the correct way to enable screen sharing is to use the ScreenShare app ( I'm still getting used to running Apps on my TV ). So for this bug, I had only enabled WiFiDirect...
Also, one of my neighbors has a ROKU which apparently supports WiFiDirect ( but Display ), and I think the crash may happen when my krillin first sees this device. The device shows up as DIRECT-roku-BCA62B on my Nexus5.
When I initiate a scan, the service crashes with the following backtrace:
root@ubuntu-phablet:~# gdb /usr/sbin/aethercast
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Reading symbols from /usr/sbin/aethercast...(no debugging symbols found)...done.
(gdb) r
Starting program: /usr/sbin/aethercast
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".
[II 2015-12-10 21:24:36] [miracastserviceadapter.cpp:133@OnNameAcquired] Registered bus name org.wds
[DD 2015-12-10 21:24:36] [wpasupplicantnetworkmanager.cpp:493@ConnectSupplicant] Connecting supplicant on /var/run/p2p0_supplicant/p2p0
[II 2015-12-10 21:25:34] [miracastserviceadapter.cpp:144@OnHandleScan] Scanning for remote devices
[EE 2015-12-10 21:25:34] g_object_unref: assertion 'G_IS_OBJECT (object)' failed
[WW 2015-12-10 21:25:34] [wpasupplicantnetworkmanager.cpp:156@OnUnsolicitedResponse] unhandled supplicant event: <3>CTRL-EVENT-BSS-ADDED 0 b8:3e:59:df:37:0d
[New Thread 0xb5eff3e0 (LWP 16206)]
[New Thread 0xb681b3e0 (LWP 16203)]
Program received signal SIGSEGV, Segmentation fault.
0xb6b34b62 in std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::basic_stringstream(std::string const&, std::_Ios_Openmode) ()
from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
(gdb) bt
#0 0xb6b34b62 in std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::basic_stringstream(std::string const&, std::_Ios_Openmode) ()
from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
#1 0x0005d9f0 in WpaSupplicantMessage const& WpaSupplicantMessage::Read<std::string, std::string&, Named<std::string>&>(std::string&, std::string&, Named<std::string>&) const ()
#2 0x00059ef2 in WpaSupplicantNetworkManager::OnP2pDeviceFound(WpaSupplicantMessage&) ()
#3 0x0005b534 in WpaSupplicantNetworkManager::OnUnsolicitedResponse(WpaSupplicantMessage) ()
#4 0x0007c54c in WpaSupplicantCommandQueue::HandleMessage(WpaSupplicantMessage) ()
#5 0x0005911a in WpaSupplicantNetworkManager::OnIncomingMessages(_GIOChannel*, GIOCondition, void*) ()
#6 0xb6e14e90 in g_main_context_dispatch ()
from /lib/arm-linux-gnueabihf/libglib-2.0.so.0
#7 0xb6e15114 in ?? () from /lib/arm-linux-gnueabihf/libglib-2.0.so.0
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
Here's an updated backtrace produced after installing the debug symbols.
It took me a few tries to reproduce, but the process is the same as originally described. Stop the default job, and run it under gdb, then enter the scan command using aethercastctl. This failed for me the first time after I installed the debug symbols, so I rebooted and tried again and was able to produce the crash.
Let me know if you need anything else.