Bug 3359 – Crash on hover with certain styles on the text applied

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Jorge Salvador Caffarena]

If you load this URL http://trac.adiumx.com/search?q=settings&wiki=on&ticket=on and hover on the 
third link, named #471 Privacy // Invisibility Settings, instant crash with this log:

Date/Time:      2005-06-08 19:47:52.582 +0200
OS Version:     10.4.1 (Build 8B15)
Report Version: 3

Command: Safari
Path:    /Applications/Safari.app/Contents/MacOS/Safari
Parent:  launchd [1]

Version:        2.0 (412)
Build Version:  1
Project Name:   WebBrowser
Source Version: 4120000

PID:    5392
Thread: 0

Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_PROTECTION_FAILURE (0x0002) at 0x00000000

Thread 0 Crashed:
0   <<00000000>> 	0xffff8824 __memcpy + 132 (cpu_capabilities.h:189)
1   com.apple.WebCore        	0x0103dc4c QString::insert(unsigned, QChar const*, unsigned) + 148 
(icplusplus.c:28)
2   com.apple.WebCore        	0x011851b0 khtml::plainText(DOM::RangeImpl const*) + 144 
(icplusplus.c:28)
3   com.apple.WebCore        	0x01050708 -[WebCoreBridge elementAtPoint:] + 644 (icplusplus.c:28)
4   com.apple.WebKit         	0x00341e74 -[WebHTMLView elementAtPoint:] + 68 (WebHTMLView.m:
2903)
5   com.apple.WebKit         	0x0034ad68 -[WebHTMLView(WebPrivate) _updateMouseoverWithEvent:] 
+ 772 (WebHTMLView.m:1029)
6   com.apple.Foundation     	0x9287bbf8 _nsnote_callback + 180
7   com.apple.CoreFoundation 	0x90771840 __CFXNotificationPost + 368
8   com.apple.CoreFoundation 	0x90769964 _CFXNotificationPostNotification + 684
9   com.apple.Foundation     	0x92866000 -[NSNotificationCenter 
postNotificationName:object:userInfo:] + 92
10  com.apple.AppKit         	0x936f9358 forwardMethod + 92
11  com.apple.AppKit         	0x936f9358 forwardMethod + 92
12  com.apple.AppKit         	0x936f9358 forwardMethod + 92
13  com.apple.AppKit         	0x936f9358 forwardMethod + 92
14  com.apple.AppKit         	0x936f9358 forwardMethod + 92
15  com.apple.AppKit         	0x936f9358 forwardMethod + 92
16  com.apple.AppKit         	0x936f9358 forwardMethod + 92
17  com.apple.AppKit         	0x936f9358 forwardMethod + 92
18  com.apple.AppKit         	0x936f9358 forwardMethod + 92
19  com.apple.AppKit         	0x936f9358 forwardMethod + 92
20  com.apple.AppKit         	0x93757ff0 -[NSTextView mouseMoved:] + 2228
21  com.apple.AppKit         	0x93687438 -[NSWindow sendEvent:] + 6424
22  com.apple.Safari         	0x0001d6bc 0x1000 + 116412
23  com.apple.AppKit         	0x9362ff5c -[NSApplication sendEvent:] + 4172
24  com.apple.Safari         	0x0001a6a4 0x1000 + 104100
25  com.apple.AppKit         	0x936273f0 -[NSApplication run] + 508
26  com.apple.AppKit         	0x93717c1c NSApplicationMain + 452
27  com.apple.Safari         	0x00002700 0x1000 + 5888
28  com.apple.Safari         	0x00057190 0x1000 + 352656

Thread 1:
0   libSystem.B.dylib        	0x9000a778 mach_msg_trap + 8
1   libSystem.B.dylib        	0x9000a6bc mach_msg + 60
2   com.apple.CoreFoundation 	0x9074a4d8 __CFRunLoopRun + 832
3   com.apple.CoreFoundation 	0x90749ddc CFRunLoopRunSpecific + 268
4   com.apple.Foundation     	0x9288b244 -[NSRunLoop runMode:beforeDate:] + 172
5   com.apple.Foundation     	0x9288b17c -[NSRunLoop run] + 76
6   com.apple.WebKit         	0x003667a4 +[WebFileDatabase _syncLoop:] + 176 
(WebFileDatabase.m:295)
7   com.apple.Foundation     	0x9287c2b4 forkThreadForFunction + 108
8   libSystem.B.dylib        	0x9002c3d4 _pthread_body + 96

Thread 2:
0   libSystem.B.dylib        	0x9000a778 mach_msg_trap + 8
1   libSystem.B.dylib        	0x9000a6bc mach_msg + 60
2   com.apple.CoreFoundation 	0x9074a4d8 __CFRunLoopRun + 832
3   com.apple.CoreFoundation 	0x90749ddc CFRunLoopRunSpecific + 268
4   com.apple.Foundation     	0x928a3760 +[NSURLConnection(NSURLConnectionInternal) 
_resourceLoadLoop:] + 264
5   com.apple.Foundation     	0x9287c2b4 forkThreadForFunction + 108
6   libSystem.B.dylib        	0x9002c3d4 _pthread_body + 96

Thread 3:
0   libSystem.B.dylib        	0x9000a778 mach_msg_trap + 8
1   libSystem.B.dylib        	0x9000a6bc mach_msg + 60
2   com.apple.CoreFoundation 	0x9074a4d8 __CFRunLoopRun + 832
3   com.apple.CoreFoundation 	0x90749ddc CFRunLoopRunSpecific + 268
4   com.apple.Foundation     	0x928a48a0 +[NSURLCache _diskCacheSyncLoop:] + 152
5   com.apple.Foundation     	0x9287c2b4 forkThreadForFunction + 108
6   libSystem.B.dylib        	0x9002c3d4 _pthread_body + 96

Thread 4:
0   libSystem.B.dylib        	0x9002ca98 semaphore_wait_signal_trap + 8
1   libSystem.B.dylib        	0x9003127c pthread_cond_wait + 508
2   com.apple.Foundation     	0x92883420 -[NSConditionLock lockWhenCondition:] + 68
3   com.apple.Syndication    	0x9b029af0 -[AsyncDB _run:] + 192
4   com.apple.Foundation     	0x9287c2b4 forkThreadForFunction + 108
5   libSystem.B.dylib        	0x9002c3d4 _pthread_body + 96

Thread 5:
0   libSystem.B.dylib        	0x9001efec select + 12
1   com.apple.CoreFoundation 	0x9075cd6c __CFSocketManager + 472
2   libSystem.B.dylib        	0x9002c3d4 _pthread_body + 96

Thread 0 crashed with PPC Thread State:
  srr0: 0xffff8824 srr1: 0x0200f030                vrsave: 0x00000000
    cr: 0x24000222  xer: 0x20000004   lr: 0x0103dc4c  ctr: 0x901241e0
    r0: 0x00000000   r1: 0xbfffdd50   r2: 0x001ffe00   r3: 0x0361069c
    r4: 0x00000000   r5: 0x00000002   r6: 0x0361069c   r7: 0x00740074
    r8: 0x0069006e   r9: 0x00000002  r10: 0x954f3f94  r11: 0x0121737c
   r12: 0x0361069c  r13: 0x00000000  r14: 0xbfffec20  r15: 0xbfffec70
   r16: 0x05aa91e0  r17: 0x055c3eb0  r18: 0x05581220  r19: 0x03496920
   r20: 0xa3629800  r21: 0x0039aa6c  r22: 0x055ef780  r23: 0x01456550
   r24: 0x05ad3040  r25: 0x00000000  r26: 0x00000002  r27: 0xbfffdf80
   r28: 0x00000026  r29: 0x00000001  r30: 0x0361069c  r31: 0x0118512c

Binary Images Description:
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A/WebKit
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Contents/MacOS/DivX 5
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liblame3.92.dylib
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libdpus10.dylib
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0x9084b000 - 0x9094dfff libicucore.A.dylib 	/usr/lib/libicucore.A.dylib
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	/System/Library/Frameworks/AddressBook.framework/Versions/A/AddressBook
0x94c7a000 - 0x94c89fff com.apple.DSObjCWrappers.Framework 1.1
	/System/Library/PrivateFrameworks/DSObjCWrappers.framework/Versions/A/DSObjCWrappers
0x94c91000 - 0x94cb8fff com.apple.LDAPFramework 1.4 (68)	/System/Library/Frameworks/
LDAP.framework/Versions/A/LDAP
0x94cbe000 - 0x94ccefff libsasl2.2.dylib 	/usr/lib/libsasl2.2.dylib
0x94cd2000 - 0x94d00fff libssl.0.9.7.dylib 	/usr/lib/libssl.0.9.7.dylib
0x94d10000 - 0x94d2dfff libresolv.9.dylib 	/usr/lib/libresolv.9.dylib
0x95491000 - 0x95514fff libstdc++.6.dylib 	/usr/lib/libstdc++.6.dylib
0x96038000 - 0x96061fff libxslt.1.dylib 	/usr/lib/libxslt.1.dylib
0x96dd0000 - 0x96e73fff libcrypto.0.9.dylib 	/usr/lib/libcrypto.0.9.dylib
0x96ea7000 - 0x96ed4fff libssl.0.9.dylib 	/usr/lib/libssl.0.9.dylib
0x97ad6000 - 0x97ae3fff com.apple.agl 2.5.6 (AGL-2.5.6)	/System/Library/Frameworks/
AGL.framework/Versions/A/AGL
0x99534000 - 0x99cc6fff com.apple.QuickTimeComponents.component 7.0.1
	/System/Library/QuickTime/QuickTimeComponents.component/Contents/MacOS/
QuickTimeComponents
0x9b027000 - 0x9b05afff com.apple.Syndication 1.0.0 (38)	/System/Library/PrivateFrameworks/
Syndication.framework/Versions/A/Syndication
0x9b075000 - 0x9b085fff com.apple.SyndicationUI 1.0.0 (38)	/System/Library/PrivateFrameworks/
SyndicationUI.framework/Versions/A/SyndicationUI
0xefbef000 - 0xefcd1fff libPSIKey.dylib 	/Library/Application Support/DivXNetworks/libPSIKey.dylib

Model: PowerBook6,1, BootROM 4.5.5f4, 1 processors, PowerPC G4  (3.3), 867 MHz, 640 MB
Graphics: NVIDIA GeForce4 MX, GeForce4 MX, AGP, 32 MB
Memory Module: DIMM0/BUILT-IN, 128 MB, built-in, built-in
Memory Module: DIMM1/J31, 512 MB, DDR SDRAM, PC2100U-25330
AirPort: AirPort Extreme, 3.5f1 (3.50.37.p6)
Modem: MicroDash, Euro, V.92, 1.0F, APPLE VERSION 2.6.4
Bluetooth: Version 1.6.0f2, 2 service, 1 devices, 1 incoming serial ports
Network Service: Ethernet incorporada, Ethernet, en0
Parallel ATA Device: MATSHITACD-RW  CW-8122, 
Parallel ATA Device: FUJITSU MHS2040AT  D, 37.26 GB
USB Device: Bluetooth HCI, , Up to 12 Mb/sec, 500 mA
USB Device: Kensington PocketMouse Pro, Kensington, Up to 1.5 Mb/sec, 500 mA

[Joost de Valk (AlthA)]

i can't reproduce this bug, not in Webkit 412 nor in the current Safari shipped with Tiger.

[Mark Rowe (bdash)]

Created attachment 2172 [details]
Test case.  The crash occurs on mouse over of the link.

The attached test case causes 100% reproducable crash.	Verified with ToT
WebKit.

[Mark Rowe (bdash)]

*** Bug 3389 has been marked as a duplicate of this bug. ***

[Joost de Valk (AlthA)]

K, can reproduce with this testcase. Changing it to javascript since the crash seems to be in there, and 
changed it to p1 since it's a reproducable crash.

[Vicki Murley]

I've been looking into this, so I went ahead and assigned it to myself.  Is that the proper Bugzilla etiquette?

[Joost de Valk (AlthA)]

It is proper etiquette :) It's not yet fixed tho? why not? :P

[Justin Garcia]

The crash occurs when a TextIterator returns a length 1 item with no characters.  But the fault lies with 
Bidi, which constructs an InlineTextBox of length 1 for the node whose nodeValue was set to 
"" (TextIterators iterate over InlineTextBoxes)

[Justin Garcia]

Created attachment 3014 [details]
Patch

In the test case, bidi adds a run of length 1 for an empty text node.  It's
length 1 because it's at the end of a line, and bidi creates the last run in a
line using "appendRunsForObject(start, bidi.eor.pos+1, obj, bidi);"  

But Bidi probably shouldn't even encounter zero length RenderObjects (from
empty text nodes) anyway, so one fix is to kill a text node's RenderObject if
its nodeValue is set to "".

This fix detaches a node if its nodeValue is set to "", and reattaches it if
nodeValue becomes non-empty.  Any suggestions?

[Maciej Stachowiak]

Comment on attachment 3014 [details]
Patch

I don't think this patch is quite right. When the document as a whole is
attached, individual nodes should not be detached, even if they do not need a
renderer. If a node changes to a state where it should no longer have a
renderer, then the right thing to do is to detach and reattach it, if it is
already attached. Then createRendererIfNeeded will do the right thing and make
a new renderer or not. Note that CharacterDataImpl::rendererIsNeeded will
already refuse to create a renderer if the string is empty.

Conversely, you can't just unconditionally attach a text node if its text is
getting changed to non-empty. If style hasn't been resolved yet, it wouldn't
have been attached in the first place.

And finally, note that the EditingTextImpl subclass of TextImpl can validly
have a renderer even if empty. This is the type of text node that gets inserted
in preparation for user typing in a space where there is no text already
present. So in addition to straightening out whether empty text nodes have a
renderer, you may also have to address the specific circumastances that cause a
crash in this case.

[Justin Garcia]

Created attachment 3103 [details]
New Patch

Maciej's right, it seems OK for zero length render objects to exist.  This
patch just prevents runs associated with a zero length render object from being
larger than they should be.

[Justin Garcia]

Created attachment 3104 [details]
layout test for patch

[Justin Garcia]

You'll have to save and view the layout test in a text editor, since it crashes Safari without the patch 
applied.

[Maciej Stachowiak]

Comment on attachment 3103 [details]
New Patch

This looks like a good fix, r=me, but since zero-length text nromally doesn't
get a renderer, it independently seems like a good idea to maintain this
property dynamically. Maybe talk to hyatt about it.

[Justin Garcia]

Landing this ...