Bug 95516 – [Mac Release] sporadic crashes under JSC::Heap::deleteUnmarkedCompiledCode()

• Component: JavaScriptCore
• Status: RESOLVED DUPLICATE

[Jessie Berlin]

I don't know when these started, but sometimes fast/profiler tests will crash with the below backtrace. I have yet to see it on Lion, WK1, or Debug, but I will update the bug if I do.

http://build.webkit.org/results/Apple%20MountainLion%20Release%20WK2%20(Tests)/r127193%20(446)/fast/profiler/built-in-function-calls-anonymous-crash-log.txt

Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000010

VM Regions Near 0x10:
--> 
    __TEXT                 00000001057a0000-00000001057a1000 [    4K] r-x/rwx SM=COW  /Volumes/VOLUME/*/WebKit2.framework/WebProcess.app/Contents/MacOS/WebProcess

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore      	0x0000000105daf1c3 JSC::Heap::deleteUnmarkedCompiledCode() + 115 (JSTypeInfo.h:66)
1   com.apple.JavaScriptCore      	0x0000000105dad812 JSC::Heap::collect(JSC::Heap::SweepToggle) + 290 (Heap.cpp:741)
2   com.apple.JavaScriptCore      	0x0000000105f2c52a JSC::DefaultGCActivityCallback::doWork() + 234 (TimeoutChecker.h:57)
3   com.apple.JavaScriptCore      	0x0000000105f2bf03 JSC::HeapTimer::timerDidFire(__CFRunLoopTimer*, void*) + 179 (TimeoutChecker.h:57)
4   com.apple.CoreFoundation      	0x00007fff8d82c4b4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
5   com.apple.CoreFoundation      	0x00007fff8d82bfcd __CFRunLoopDoTimer + 557
6   com.apple.CoreFoundation      	0x00007fff8d8117b9 __CFRunLoopRun + 1513
7   com.apple.CoreFoundation      	0x00007fff8d810dd2 CFRunLoopRunSpecific + 290
8   com.apple.HIToolbox           	0x00007fff88c3a774 RunCurrentEventLoopInMode + 209
9   com.apple.HIToolbox           	0x00007fff88c3a512 ReceiveNextEventCommon + 356
10  com.apple.HIToolbox           	0x00007fff88c3a3a3 BlockUntilNextEventMatchingListInMode + 62
11  com.apple.AppKit              	0x00007fff8773efa3 _DPSNextEvent + 685
12  com.apple.AppKit              	0x00007fff8773e862 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
13  com.apple.AppKit              	0x00007fff87735c03 -[NSApplication run] + 517
14  com.apple.WebCore             	0x0000000106ba79c3 WebCore::RunLoop::run() + 67 (RunLoopMac.mm:36)
15  com.apple.WebKit2             	0x00000001058cb77b WebKit::WebProcessMain(WebKit::CommandLine const&) + 2858 (WebProcessMainMac.mm:228)
16  com.apple.WebKit2             	0x0000000105879169 WebKitMain + 311 (WebKitMain.cpp:50)
17  com.apple.WebProcess          	0x00000001057a0e7b main + 214
18  libdyld.dylib                 	0x00007fff893067e1 start + 1

[Radar WebKit Bug Importer]

<rdar://problem/12211793>

[Mark Hahnenberg]

Looks like the Structure is null.

[Jessie Berlin]

This can apparently happen on Lion WK1 as well http://build.webkit.org/results/Apple%20Lion%20Release%20WK1%20(Tests)/r127325%20(3058)/fast/profiler/document-dot-write-crash-log.txt

[Tim Horton]

This looks to have gotten a lot worse in recent days, but I can't pinpoint it to a particular revision; something since Thursday or Friday, anyway. We see it a few times every run on Mountain Lion Release WK1: http://build.webkit.org/results/Apple%20MountainLion%20Release%20WK1%20(Tests)/r128201%20(853)/results.html

[Tim Horton]

(In reply to comment #4)
> This looks to have gotten a lot worse in recent days, but I can't pinpoint it to a particular revision; something since Thursday or Friday, anyway. We see it a few times every run on Mountain Lion Release WK1: http://build.webkit.org/results/Apple%20MountainLion%20Release%20WK1%20(Tests)/r128201%20(853)/results.html

I believe this regressed significantly with http://trac.webkit.org/changeset/128146, actually.

[Alexey Proskuryakov]

We believe that bug 96464 fixed it.

*** This bug has been marked as a duplicate of bug 96464 ***