Bug 126913 – ASSERTION FAILED: !m_insertions.size() || m_insertions.last().index() <= insertion.index() in JSC::DFG::InsertionSet::insert

• Component: JavaScriptCore
• Status: NEW

[Renata Hodovan]

Created attachment 221058 [details]
Test case

The assertion failure happens with the following test case (on ubuntu 13.10, x86_64):

function function_0 (var_1) {
	do {

	} while (var_1 != "M" );

	delete  [ var_1 >>> ( new Number(0).NaN = delete [ var_1 << var_1 ] ) ];

}

function_0();


GDB backtrace:

ASSERTION FAILED: !m_insertions.size() || m_insertions.last().index() <= insertion.index()
/home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGInsertionSet.h(50) : JSC::DFG::Node* JSC::DFG::InsertionSet::insert(const Insertion&)
1   0x7ffff74a6000 WTFCrash
2   0x7ffff705df0e JSC::DFG::InsertionSet::insert(WTF::Insertion<JSC::DFG::Node*> const&)
3   0x7ffff705df76 JSC::DFG::InsertionSet::insert(unsigned long, JSC::DFG::Node*)
4   0x7ffff7060ee6 JSC::DFG::Node* JSC::DFG::InsertionSet::insertNode<JSC::DFG::NodeType, JSC::CodeOrigin, JSC::DFG::Edge>(unsigned long, unsigned int, JSC::DFG::NodeType const&, JSC::CodeOrigin const&, JSC::DFG::Edge const&)
5   0x7ffff70d7fb7 JSC::DFG::DCEPhase::fixupBlock(JSC::DFG::BasicBlock*)
6   0x7ffff70d7b26 JSC::DFG::DCEPhase::run()
7   0x7ffff70d8b1f bool JSC::DFG::runAndLog<JSC::DFG::DCEPhase>(JSC::DFG::DCEPhase&)
8   0x7ffff70d86c3 bool JSC::DFG::runPhase<JSC::DFG::DCEPhase>(JSC::DFG::Graph&)
9   0x7ffff70d70bf JSC::DFG::performDCE(JSC::DFG::Graph&)
10  0x7ffff7162c6e JSC::DFG::Plan::compileInThreadImpl(JSC::DFG::LongLivedState&)
11  0x7ffff7162616 JSC::DFG::Plan::compileInThread(JSC::DFG::LongLivedState&)
12  0x7ffff70e93a0
13  0x7ffff70e943b JSC::DFG::compile(JSC::VM&, JSC::CodeBlock*, JSC::DFG::CompilationMode, unsigned int, JSC::Operands<JSC::JSValue, JSC::OperandValueTraits<JSC::JSValue> > const&, WTF::PassRefPtr<JSC::DeferredCompilationCallback>, JSC::DFG::Worklist*)
14  0x7ffff725bdd7
15  0x7fffea58dc20

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff74a6005 in WTFCrash () at /home/reni/Data/REPOS/webkit_sec/Source/WTF/wtf/Assertions.cpp:333
333	    *(int *)(uintptr_t)0xbbadbeef = 0;
(gdb) bt
#0  0x00007ffff74a6005 in WTFCrash () at /home/reni/Data/REPOS/webkit_sec/Source/WTF/wtf/Assertions.cpp:333
#1  0x00007ffff705df0e in JSC::DFG::InsertionSet::insert (this=0x7fffffffb320, insertion=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGInsertionSet.h:50
#2  0x00007ffff705df76 in JSC::DFG::InsertionSet::insert (this=0x7fffffffb320, index=27, element=0x7fffa9762300)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGInsertionSet.h:57
#3  0x00007ffff7060ee6 in JSC::DFG::InsertionSet::insertNode<JSC::DFG::NodeType, JSC::CodeOrigin, JSC::DFG::Edge> (this=0x7fffffffb320, index=27, type=0, 
    _DFG_value1=@0x7fffffffade0: JSC::DFG::Phantom, _DFG_value2=..., _DFG_value3=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGInsertionSet.h:65
#4  0x00007ffff70d7fb7 in JSC::DFG::DCEPhase::fixupBlock (this=0x7fffffffaf00, block=0x673a50)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGDCEPhase.cpp:221
#5  0x00007ffff70d7b26 in JSC::DFG::DCEPhase::run (this=0x7fffffffaf00) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGDCEPhase.cpp:119
#6  0x00007ffff70d8b1f in JSC::DFG::runAndLog<JSC::DFG::DCEPhase> (phase=...) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGPhase.h:75
#7  0x00007ffff70d86c3 in JSC::DFG::runPhase<JSC::DFG::DCEPhase> (graph=...) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGPhase.h:85
#8  0x00007ffff70d70bf in JSC::DFG::performDCE (graph=...) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGDCEPhase.cpp:279
#9  0x00007ffff7162c6e in JSC::DFG::Plan::compileInThreadImpl (this=0x6759a0, longLivedState=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGPlan.cpp:242
#10 0x00007ffff7162616 in JSC::DFG::Plan::compileInThread (this=0x6759a0, longLivedState=...)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGPlan.cpp:124
#11 0x00007ffff70e93a0 in JSC::DFG::compileImpl (vm=..., codeBlock=0x6766b0, mode=JSC::DFG::DFGMode, osrEntryBytecodeIndex=1, mustHandleValues=..., 
    callback=..., worklist=0x0) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGDriver.cpp:100
#12 0x00007ffff70e943b in JSC::DFG::compile (vm=..., codeBlock=0x6766b0, mode=JSC::DFG::DFGMode, osrEntryBytecodeIndex=1, mustHandleValues=..., 
    passedCallback=..., worklist=0x0) at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/dfg/DFGDriver.cpp:119
#13 0x00007ffff725bdd7 in JSC::operationOptimize (exec=0x7fffa9d4df38, bytecodeIndex=1)
    at /home/reni/Data/REPOS/webkit_sec/Source/JavaScriptCore/jit/JITOperations.cpp:1152
#14 0x00007fffea58dc20 in ?? ()
#15 0x00007fffaa58e8e0 in ?? ()
#16 0x0000000000652868 in ?? ()
#17 0x0000000000000000 in ?? ()

[Filip Pizlo]

When I run this test case it just runs for forever.

What revision are you on?  If you can still reproduce, can you enable per-phase DFG dumps, either by "export JSC_dumpGraphAtEachPhase=true" or the "--dumpGraphAtEachPhase=true" jsc command-line option?

[Renata Hodovan]

(In reply to comment #1)
> When I run this test case it just runs for forever.
> 
> What revision are you on?  If you can still reproduce, can you enable per-phase DFG dumps, either by "export JSC_dumpGraphAtEachPhase=true" or the "--dumpGraphAtEachPhase=true" jsc command-line option?

Yes, I can still reproduce it with the ToTT debug efl build (r161958). The log with the flags above is attached.

[Renata Hodovan]

Created attachment 221160 [details]
JSCGraph log

[Brent Fulgham]

This does seem like it just runs forever. Is there any action we want to take here?

[Oliver Hunt]

(In reply to comment #4)
> This does seem like it just runs forever. Is there any action we want to
> take here?

just to verify - are you running with debug jsc?

[Brent Fulgham]

(In reply to comment #5)
> (In reply to comment #4)
> > This does seem like it just runs forever. Is there any action we want to
> > take here?
> 
> just to verify - are you running with debug 

I was running Debug WebKit/JavaScriptCore, not the jsc command line utility. But, yes.