Bug 30978 – [Qt] ASSERT failure while running DRT

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Yael]

When running DRT in Debug mode, _many_ tests are crashing due to ASSERT failure in JavaScriptCore. All the crashes I looked at, lead to the same callstack:

ASSERTION FAILED: !m_isCheckingForDefaultMarkViolation
(../../../JavaScriptCore/runtime/JSCell.h:318 void JSC::MarkStack::append(JSC::JSCell*))
Segmentation fault
0: /home/yael/trunk4/WebKitBuild/Debug/bin/DumpRenderTree [0x805ba69]
1: /home/yael/trunk4/WebKitBuild/Debug/bin/DumpRenderTree [0x805be7c]
2: [0xb80e0400]
3: /home/yael/trunk4/WebKitBuild/Debug/lib/libQtWebKit.so.4(_ZN3JSC9MarkStack6appendEPNS_6JSCellE+0x4c) [0xb6835908]
4: /home/yael/trunk4/WebKitBuild/Debug/lib/libQtWebKit.so.4(_ZN3JSC8Bindings10QtInstance13markAggregateERNS_9MarkStackE+0xc0) [0xb70de9d2]
5: /home/yael/trunk4/WebKitBuild/Debug/lib/libQtWebKit.so.4(_ZN3JSC8Bindings18QtRuntimeObjectImp12markChildrenERNS_9MarkStackE+0x4a) [0xb70dffe2]
6: /home/yael/trunk4/WebKitBuild/Debug/lib/libQtWebKit.so.4(_ZN3JSC9MarkStack12markChildrenEPNS_6JSCellE+0xed) [0xb690be91]
7: /home/yael/trunk4/WebKitBuild/Debug/lib/libQtWebKit.so.4(_ZN3JSC9MarkStack5drainEv+0x2bc) [0xb690c1f8]
8: /home/yael/trunk4/WebKitBuild/Debug/lib/libQtWebKit.so.4(_ZN3JSC4Heap18markConservativelyERNS_9MarkStackEPvS3_+0x215) [0xb690c5bb]
9: /home/yael/trunk4/WebKitBuild/Debug/lib/libQtWebKit.so.4(_ZN3JSC12RegisterFile11markGlobalsERNS_9MarkStackEPNS_4HeapE+0x3e) [0xb68357d2]
10: /home/yael/trunk4/WebKitBuild/Debug/lib/libQtWebKit.so.4(_ZN3JSC14JSGlobalObject12markChildrenERNS_9MarkStackE+0x21f) [0xb6835e63]
...

[Kenneth Rohde Christiansen]

Is this in the Qt implementation? or shared code?

[Yael]

(In reply to comment #1)
> Is this in the Qt implementation? or shared code?

The ASSERT is in shared code. I marked this as Qt bug because I do not get this ASSERT when running DRT on Mac.

[Yael]

Created attachment 43235 [details]
Patch

Add needed Structure typeInfo flags to QtRuntimeObjectImpl and QtRuntimeMethod. These flags are needed after r49649, where HasDefaultmark was changed to OverrideMarkChildren.

[Kenneth Rohde Christiansen]

Good that you are looking into this, but does it really make sense to make those statics?

[Yael]

(In reply to comment #4)
> Good that you are looking into this, but does it really make sense to make
> those statics?

I followed what Oliver did in r49694 and r49721. StructureFlags is static everywhere else.

[Kenneth Rohde Christiansen]

OK then :-)

[Yael]

Committed r51052: <http://trac.webkit.org/changeset/51052>