Chrome Version       : 55.0.2883.87
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
URLs (if applicable) :
Other browsers tested:
  Add OK or FAIL after other browsers where you have tested this issue:
     Safari 5:
  Firefox 4.x:
     IE 7/8/9:

What steps will reproduce the problem?
1.
2.
3.

What is the expected result?


What happens instead of that?


Please provide any additional information below. Attach a screenshot if
possible.

UserAgentString: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

Hi, I meet a flash hung, dump just follows:

Render Process:
Main thread:
Send sync ipc(PpapiMsg_SupportsInterface) to ppapi process
stack frames:
0012d58c 7c92df4a ntdll!KiFastSystemCallRet
0012d590 7c809590 ntdll!ZwWaitForMultipleObjects+0xc
0012d62c 7c80a115 kernel32!WaitForMultipleObjectsEx+0x12c
0012d648 100f3e24 kernel32!WaitForMultipleObjects+0x18
0012d770 100f4106 chrome_child!base::WaitableEvent::WaitMany+0x66 [d:\webapps\b\build\slave\repo\build\src\base\synchronization\waitable_event_win.cc @ 85]
0012d79c 10052b46 chrome_child!IPC::SyncChannel::WaitForReply+0x77 [d:\webapps\b\build\slave\repo\build\src\ipc\ipc_sync_channel.cc @ 520]
0012d7d8 118ef25b chrome_child!IPC::SyncChannel::Send+0xea [d:\webapps\b\build\slave\repo\build\src\ipc\ipc_sync_channel.cc @ 504]
0012d7e8 118ed44c chrome_child!ppapi::proxy::ProxyChannel::Send+0x18 [d:\webapps\b\build\slave\repo\build\src\ppapi\proxy\proxy_channel.cc @ 89]
0012d840 118ecff9 chrome_child!ppapi::proxy::HostDispatcher::Send+0x116 [d:\webapps\b\build\slave\repo\build\src\ppapi\proxy\host_dispatcher.cc @ 161]
0012d888 11721d4a chrome_child!ppapi::proxy::HostDispatcher::GetProxiedInterface+0x84 [d:\webapps\b\build\slave\repo\build\src\ppapi\proxy\host_dispatcher.cc @ 232]
0012d8b8 116cfb1b chrome_child!content::HostDispatcherWrapper::GetProxiedInterface+0x2f [d:\webapps\b\build\slave\repo\build\src\content\renderer\pepper\host_dispatcher_wrapper.cc @ 78]
0012d8c8 11c6d407 chrome_child!content::PluginModule::GetPluginInterface+0x19 [d:\webapps\b\build\slave\repo\build\src\content\renderer\pepper\plugin_module.cc @ 661]
....


PPAPI Process:
Main thread:
Send sync ipc(PpapiHostMsg_PPBInstance_ExecuteScript) to render process
00 0012dc9c 7c92df4a 7c809590 00000002 0012dcc8 ntdll!KiFastSystemCallRet (FPO: [0,0,0])
01 0012dca0 7c809590 00000002 0012dcc8 00000001 ntdll!ZwWaitForMultipleObjects+0xc (FPO: [5,0,0])
02 0012dd3c 7c80a115 00000002 0012dd78 00000000 kernel32!WaitForMultipleObjectsEx+0x12c (FPO: [Non-Fpo])
03 0012dd58 100f3e24 00000002 0012dd78 00000000 kernel32!WaitForMultipleObjects+0x18 (FPO: [Non-Fpo])
04 0012de80 100f4106 0012de9c 00000002 00000000 chrome_child!base::WaitableEvent::WaitMany+0x66 (FPO: [Non-Fpo]) (CONV: cdecl) [d:\webapps\b\build\slave\repo\build\src\base\synchronization\waitable_event_win.cc @ 85]
05 0012deac 10052b46 0092e710 00000000 00961fc0 chrome_child!IPC::SyncChannel::WaitForReply+0x77 (FPO: [Non-Fpo]) (CONV: cdecl) [d:\webapps\b\build\slave\repo\build\src\ipc\ipc_sync_channel.cc @ 520]
06 0012dee8 118ef25b 00961fc0 00000000 0012df08 chrome_child!IPC::SyncChannel::Send+0xea (FPO: [Non-Fpo]) (CONV: thiscall) [d:\webapps\b\build\slave\repo\build\src\ipc\ipc_sync_channel.cc @ 504]
07 0012def8 118fe4d8 00961fc0 129e617e 0012df44 chrome_child!ppapi::proxy::ProxyChannel::Send+0x18 (FPO: [Non-Fpo]) (CONV: thiscall) [d:\webapps\b\build\slave\repo\build\src\ppapi\proxy\proxy_channel.cc @ 89]
08 0012df08 118fe3ca 00961fc0 009999d4 00961fc0 chrome_child!ppapi::proxy::PluginDispatcher::SendMessageW+0x28 (FPO: [Non-Fpo]) (CONV: thiscall) [d:\webapps\b\build\slave\repo\build\src\ppapi\proxy\plugin_dispatcher.cc @ 195]
09 0012df44 11903dbd 00961fc0 0012dfb4 0012e09c chrome_child!ppapi::proxy::PluginDispatcher::Send+0xbf (FPO: [Non-Fpo]) (CONV: thiscall) [d:\webapps\b\build\slave\repo\build\src\ppapi\proxy\plugin_dispatcher.cc @ 219]
0a 0012df94 11fae26e 0012e0a0 a3c36f29 00000005 chrome_child!ppapi::proxy::PPB_Instance_Proxy::ExecuteScript+0xaa (FPO: [Non-Fpo]) (CONV: thiscall) [d:\webapps\b\build\slave\repo\build\src\ppapi\proxy\ppb_instance_proxy.cc @ 299]
0b 0012e0b4 023b57b0 0012e0e8 a3c36f29 00000005 chrome_child!ppapi::thunk::`anonymous namespace'::ExecuteScript+0xa6 (FPO: [Non-Fpo]) (CONV: cdecl) [d:\webapps\b\build\slave\repo\build\src\ppapi\thunk\ppb_instance_private_thunk.cc @ 41]
WARNING: Stack unwind information not available. Following frames may be wrong.
0c 0012e130 01c54a7e 0012e198 00000000 03019000 pepflashplayer+0x7657b0
0d 0012e1d8 01faccbe 050e61a8 03472f50 0301a810 pepflashplayer+0x4a7e
0e 0012e20c 01e4eb93 04746d30 04fe7370 01d0b49e pepflashplayer+0x35ccbe
0f 0012e238 01d0b2a5 05031a90 00000001 0012e288 pepflashplayer+0x1feb93
10 0012e338 01d0b49e 05031a00 00000002 0012e388 pepflashplayer+0xbb2a5
11 0012e358 01d0b2a5 05031a00 00000002 0012e388 pepflashplayer+0xbb49e
12 0012e3a8 01d0b49e 047f7a00 00000001 0012e410 pepflashplayer+0xbb2a5
13 0012e3c8 01d0b2a5 047f7a00 00000001 0012e410 pepflashplayer+0xbb49e