[Webkit-unassigned] [Bug 51511] New: Crash in JavaScriptCore/jit/ExecutableAllocatorFixedVMPool.cpp:308 on x86_64 linux with <4GB ram

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=51511

           Summary: Crash in
                    JavaScriptCore/jit/ExecutableAllocatorFixedVMPool.cpp:
                    308 on x86_64 linux with <4GB ram
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kevin-webkit at scrye.com


JIT enabled. 
x86_64 linux (Fedora)
machines with less than 4GB of physical memory 

Any webkitgtk using application crashes on start with something like: 

Program terminated with signal 11, Segmentation fault.
#0  0x00007f3c5e7bc7c3 in FixedVMPoolAllocator (this=<value optimized out>) at
JavaScriptCore/jit/ExecutableAllocatorFixedVMPool.cpp:308
308             CRASH();
#0  0x00007f3c5e7bc7c3 in FixedVMPoolAllocator (this=<value optimized out>) at
JavaScriptCore/jit/ExecutableAllocatorFixedVMPool.cpp:308
#1  JSC::ExecutableAllocator::isValid (this=<value optimized out>) at
JavaScriptCore/jit/ExecutableAllocatorFixedVMPool.cpp:460
#2  0x00007f3c5e72960d in ExecutableAllocator (this=0x7f3c5f458a00,
globalDataType=<value optimized out>,
threadStackType=JSC::ThreadStackTypeLarge) at
JavaScriptCore/jit/ExecutableAllocator.h:170
#3  JSC::JSGlobalData::JSGlobalData (this=0x7f3c5f458a00, globalDataType=<value
optimized out>, threadStackType=JSC::ThreadStackTypeLarge) at
JavaScriptCore/runtime/JSGlobalData.cpp:151
#4  0x00007f3c5e729ff3 in JSC::JSGlobalData::create
(type=JSC::ThreadStackTypeLarge) at JavaScriptCore/runtime/JSGlobalData.cpp:240
#5  0x00007f3c5e72a042 in JSC::JSGlobalData::createLeaked
(type=JSC::ThreadStackTypeLarge) at JavaScriptCore/runtime/JSGlobalData.cpp:246
#6  0x00007f3c5d979462 in WebCore::JSDOMWindowBase::commonJSGlobalData () at
WebCore/bindings/js/JSDOMWindowBase.cpp:160
#7  0x00007f3c5d951905 in WebCore::mainThreadNormalWorld () at
WebCore/bindings/js/DOMWrapperWorld.cpp:81
#8  0x00007f3c5e13c0d6 in webkit_web_frame_get_global_context (frame=<value
optimized out>) at WebKit/gtk/webkit/webkitwebframe.cpp:697
#9  0x0000000000404ae4 in newclient () at surf.c:493
#10 0x0000000000404f6d in main (argc=<value optimized out>, argv=<value
optimized out>) at surf.c:839

Downstream bug report is at: 
https://bugzilla.redhat.com/show_bug.cgi?id=648319
with more info and crash traces. 

Compiling without JIT works around it. 
Having 4GB physical memory works around it fine. 
Setting linux memory overcommit to 1 works around it. 

Happy to provide more info, or ask downstream reporters to provide some.

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