[Webkit-unassigned] [Bug 115650] New: [GTK][WK2] Locks when fetching plugins information

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=115650

           Summary: [GTK][WK2] Locks when fetching plugins information
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: csaavedra at igalia.com
                CC: mrobinson at webkit.org, cgarcia at igalia.com


bool PluginProcessProxy::scanPlugin() is a synchronous method and it's using g_spawn_sync(), which blocks for a couple of seconds every now and then:

(gdb) back
#0  0x0000003a2c0ec653 in select () at ../sysdeps/unix/syscall-template.S:81
#1  0x0000003a2e489957 in g_spawn_sync (working_directory=<optimized out>,
    argv=<optimized out>, envp=<optimized out>, flags=<optimized out>,
    child_setup=<optimized out>, user_data=<optimized out>,
    standard_output=0x7fffffffd4e8, standard_error=0x0, exit_status=0x7fffffffd4bc,
    error=0x0) at gspawn.c:328
#2  0x0000003a55cd6cbf in WebKit::PluginProcessProxy::scanPlugin ()
   from /lib64/libwebkit2gtk-3.0.so.25
#3  0x0000003a55c481fa in WebKit::NetscapePluginModule::getPluginInfo ()
   from /lib64/libwebkit2gtk-3.0.so.25
#4  0x0000003a55ccbbb7 in WebKit::PluginInfoStore::loadPlugin ()
   from /lib64/libwebkit2gtk-3.0.so.25
#5  0x0000003a55ccc76b in WebKit::PluginInfoStore::loadPluginsIfNecessary ()
   from /lib64/libwebkit2gtk-3.0.so.25
#6  0x0000003a55cccb41 in WebKit::PluginInfoStore::plugins ()
   from /lib64/libwebkit2gtk-3.0.so.25
#7  0x0000003a55d28418 in WebKit::WebProcessProxy::getPlugins ()
   from /lib64/libwebkit2gtk-3.0.so.25
#8  0x0000003a55dddb0a in WebKit::WebProcessProxy::didReceiveSyncWebProcessProxyMessage
    () from /lib64/libwebkit2gtk-3.0.so.25
#9  0x0000003a55c1f9ec in CoreIPC::Connection::dispatchSyncMessage ()
   from /lib64/libwebkit2gtk-3.0.so.25
#10 0x0000003a55c1fb35 in CoreIPC::Connection::dispatchMessage ()
   from /lib64/libwebkit2gtk-3.0.so.25
#11 0x0000003a55c217b4 in CoreIPC::Connection::SyncMessageState::dispatchMessages ()
   from /lib64/libwebkit2gtk-3.0.so.25
#12 0x0000003a56c3f99d in WebCore::RunLoop::performWork ()
   from /lib64/libwebkit2gtk-3.0.so.25
#13 0x0000003a570ff039 in WebCore::RunLoop::queueWork ()
   from /lib64/libwebkit2gtk-3.0.so.25
#14 0x0000003a2e447f56 in g_main_dispatch (context=0x70b8d0) at gmain.c:3054
#15 g_main_context_dispatch (context=context at entry=0x70b8d0) at gmain.c:3630
#16 0x0000003a2e4482a8 in g_main_context_iterate (context=context at entry=0x70b8d0,
    block=block at entry=1, dispatch=dispatch at entry=1, self=<optimized out>)
    at gmain.c:3701
#17 0x0000003a2e44834c in g_main_context_iteration (context=0x70b8d0,
    context at entry=0x0, may_block=may_block at entry=1) at gmain.c:3762
#18 0x0000003a30496564 in g_application_run (application=0x8cc060 [EphyShell],
    argc=argc at entry=1, argv=argv at entry=0x7fffffffdd48) at gapplication.c:1623
#19 0x000000000042ebbe in main (argc=1, argv=0x7fffffffdd48) at ephy-main.c:472

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