[Webkit-unassigned] [Bug 101337] New: [Qt] NonSharedCharacterBreakIterator leads to CRASH() in configurations that do not have COMPARE_AND_SWAP enabled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=101337

           Summary: [Qt] NonSharedCharacterBreakIterator leads to CRASH()
                    in configurations that do not have COMPARE_AND_SWAP
                    enabled
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P3
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: chombourger at mvista.com


While trying to bring-up the QtWebkit-2.3 on an embedded system running an ARM 11MPCore, found ~NonSharedCharacterBreakIterator() to lead to a CRASH()

(gdb) bt
#0  0x2cda3318 in weakCompareAndSwap (this=0x7ebd8c3c, __in_chrg=<value optimized out>)
    at /home/chombourger/bp-mvl-project/tmp/work/armv6-mv-linux/qtwebkit-2.3.0-r4/chombourger-qtwebkit-23/Source/WTF/wtf/Atomics.h:200
#1  WebCore::NonSharedCharacterBreakIterator::~NonSharedCharacterBreakIterator (this=0x7ebd8c3c, 
    __in_chrg=<value optimized out>)
    at /home/chombourger/bp-mvl-project/tmp/work/armv6-mv-linux/qtwebkit-2.3.0-r4/chombourger-qtwebkit-23/Source/WebCore/platform/text/qt/TextBreakIteratorQt.cpp:87

Found this to be caused by TextBreakIteratorQt.cpp making use of weakCompareAndSwap even though COMPARE_AND_SWAP is not enabled in my configuration.

Looks like the same issue existed in the ICU implementation and was worked-around by adding a static mutex to protect the single entry NonSharedCharacterBreakIterator cache

Configuration details:

git: git://gitorious.org/+qtwebkit-developers/webkit/qtwebkit-23.git
rev: abd77b3f85375632aa313934e8eb9ae89f2bbf2e

cat /proc/cpuinfo 
Processor       : ARMv6-compatible processor rev 4 (v6l)
processor       : 0
BogoMIPS        : 398.95

processor       : 1
BogoMIPS        : 398.95

Features        : swp half thumb fastmult vfp edsp java 
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xb02
CPU revision    : 4

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