Bug 13218 - Reproducible crash after call to window.close()
Summary: Reproducible crash after call to window.close()
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: WebCore JavaScript (show other bugs)
Version: 523.x (Safari 3)
Hardware: All OS X 10.4
: P1 Critical
Assignee: Nobody
URL:
Keywords: InRadar
: 14308 (view as bug list)
Depends on:
Blocks:
 
Reported: 2007-03-28 10:38 PDT by Tom Brown
Modified: 2007-06-23 06:45 PDT (History)
3 users (show)

See Also:


Attachments
Possible fix (752 bytes, patch)
2007-03-29 00:13 PDT, mitz
no flags Details | Formatted Diff | Diff
Test case reduction (zip file) (6.76 KB, application/octet-stream)
2007-03-29 11:23 PDT, Tom Brown
no flags Details
Another try (1.38 KB, patch)
2007-03-29 11:39 PDT, mitz
no flags Details | Formatted Diff | Diff
Create a fake mouse move event instead of using the current event (3.65 KB, patch)
2007-03-29 14:44 PDT, mitz
no flags Details | Formatted Diff | Diff
Create a fake mouse move event instead of using the current event (7.91 KB, patch)
2007-03-29 16:48 PDT, mitz
no flags Details | Formatted Diff | Diff
Don't use mouse events at all for hover state update (4.20 KB, patch)
2007-04-02 15:44 PDT, mitz
darin: review+
Details | Formatted Diff | Diff

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Description Tom Brown 2007-03-28 10:38:53 PDT
In the context of a webapp I'm writing, closing a child window sometimes causes the browser to crash. I have included the backtrace, and I suspect that this has similar roots to the original bug reported within bug #13124 (though I have not been able to reduce either one effectively).

The interaction is complex, but is something along the lines of:

1) Main window opens pop-up child window.
2) User performs some action within the child window.
3) The child window sends an AJAX request to the server from the context of the main window.
4) The main window receives a response from the server, and passes it into the context of the child window.
5) The child window closes itself (window.close).
6) Within it's onunload handler, the child window performs cleanup by sending a "closed" notification to the server.
?) At some point between 5 and 6, the browser crashes.

A workaround has been found that seems to be effective, though inconvenient:
1) Before the child window is closed, it's onunload handler is manually called.
2) The actual "window.close" call is delayed using "setTimeout" by 500 milliseconds*.

If a reduction is found, it will be posted here.

* The exact time doesn't seem to be important, but the crash still occurred when the timeout was only 100 milliseconds.

Date/Time:      2007-03-28 11:25:21.748 -0600
OS Version:     10.4.8 (Build 8L2127)
Report Version: 4

Command: Safari
Path:    /Applications/Safari.app/Contents/MacOS/Safari
Parent:  WindowServer [59]

Version: ??? (20512)

PID:    19688
Thread: 0

Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_INVALID_ADDRESS (0x0001) at 0x4489001e

Thread 0 Crashed:
0   libobjc.A.dylib          	0x90a54438 _class_lookupMethodAndLoadCache + 72
1   libobjc.A.dylib          	0x90a543c6 objc_msgSend + 86
2   com.apple.WebCore        	0x011de370 WebCore::globalPoint(_NSPoint const&, NSWindow*) + 32
3   com.apple.WebCore        	0x011de5fb WebCore::globalPointForEvent(NSEvent*) + 139
4   com.apple.WebCore        	0x011de784 WebCore::PlatformMouseEvent::PlatformMouseEvent[in-charge](WebCore::PlatformMouseEvent::CurrentEventTag const&) + 132
5   com.apple.WebCore        	0x013c132b WebCore::EventHandler::hoverTimerFired(WebCore::Timer<WebCore::EventHandler>*) + 59
6   com.apple.WebCore        	0x0146b7d2 WebCore::Timer<WebCore::EventHandler>::fired() + 82
7   com.apple.WebCore        	0x011d7449 WebCore::TimerBase::fireTimers(double, WTF::Vector<WebCore::TimerBase*, (unsigned long)0> const&) + 137
8   com.apple.WebCore        	0x011d7502 WebCore::TimerBase::sharedTimerFired() + 162
9   com.apple.CoreFoundation 	0x90829bc9 CFRunLoopRunSpecific + 3341
10  com.apple.CoreFoundation 	0x90828eb5 CFRunLoopRunInMode + 61
11  com.apple.HIToolbox      	0x92dcdb90 RunCurrentEventLoopInMode + 285
12  com.apple.HIToolbox      	0x92dcd297 ReceiveNextEventCommon + 385
13  com.apple.HIToolbox      	0x92dcd0ee BlockUntilNextEventMatchingListInMode + 81
14  com.apple.AppKit         	0x9326f465 _DPSNextEvent + 572
15  com.apple.AppKit         	0x9326f056 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 137
16  com.apple.Safari         	0x00006f96 0x1000 + 24470
17  com.apple.AppKit         	0x93268ddb -[NSApplication run] + 512
18  com.apple.AppKit         	0x9325cd2f NSApplicationMain + 573
19  com.apple.Safari         	0x0005f7de 0x1000 + 387038
20  com.apple.Safari         	0x0005f6f9 0x1000 + 386809

Thread 1:
0   libSystem.B.dylib        	0x90009857 mach_msg_trap + 7
1   com.apple.CoreFoundation 	0x9082969a CFRunLoopRunSpecific + 2014
2   com.apple.CoreFoundation 	0x90828eb5 CFRunLoopRunInMode + 61
3   com.apple.Foundation     	0x9262aa9b +[NSURLConnection(NSURLConnectionInternal) _resourceLoadLoop:] + 259
4   com.apple.Foundation     	0x925f536c forkThreadForFunction + 123
5   libSystem.B.dylib        	0x90023d87 _pthread_body + 84

Thread 2:
0   libSystem.B.dylib        	0x90009857 mach_msg_trap + 7
1   com.apple.CoreFoundation 	0x9082969a CFRunLoopRunSpecific + 2014
2   com.apple.CoreFoundation 	0x90828eb5 CFRunLoopRunInMode + 61
3   com.apple.Foundation     	0x92651c4e +[NSURLCache _diskCacheSyncLoop:] + 206
4   com.apple.Foundation     	0x925f536c forkThreadForFunction + 123
5   libSystem.B.dylib        	0x90023d87 _pthread_body + 84

Thread 3:
0   libSystem.B.dylib        	0x90019d3c select + 12
1   libSystem.B.dylib        	0x90023d87 _pthread_body + 84

Thread 4:
0   libSystem.B.dylib        	0x90024427 semaphore_wait_signal_trap + 7
1   com.apple.Foundation     	0x9264b2f8 -[NSConditionLock lockWhenCondition:] + 39
2   com.apple.Syndication    	0x9a6d6052 -[AsyncDB _run:] + 181
3   com.apple.Foundation     	0x925f536c forkThreadForFunction + 123
4   libSystem.B.dylib        	0x90023d87 _pthread_body + 84

Thread 0 crashed with X86 Thread State (32-bit):
  eax: 0x4489000e    ebx: 0x90a543fe ecx: 0x90abe3e4 edx: 0x000033fb
  edi: 0x02198b30    esi: 0x15bfb7f0 ebp: 0xbfffeb48 esp: 0xbfffeb00
   ss: 0x0000001f    efl: 0x00010246 eip: 0x90a54438  cs: 0x00000017
   ds: 0x0000001f     es: 0x0000001f  fs: 0x00000000  gs: 0x00000037

Binary Images Description:
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0x91661000 - 0x916defff com.apple.print.framework.PrintCore 4.6 (177.13)	/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Versions/A/PrintCore
0x9170b000 - 0x917b4fff com.apple.QD 3.10.21 (???)	/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/QD.framework/Versions/A/QD
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Model: Macmini1,1, BootROM MM11.0055.B08, 2 processors, Intel Core Duo, 1.66 GHz, 1 GB
Graphics: Intel GMA 950, GMA 950, Built-In, spdisplays_integrated_vram
Memory Module: BANK 0/DIMM0, 512 MB, DDR2 SDRAM, 667 MHz
Memory Module: BANK 1/DIMM1, 512 MB, DDR2 SDRAM, 667 MHz
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x86), 0.1.31.1
Bluetooth: Version 1.7.9f12, 2 service, 1 devices, 1 incoming serial ports
Network Service: Built-in Ethernet, Ethernet, en0
Serial ATA Device: FUJITSU MHV2080BHPL, 74.53 GB
Parallel ATA Device: MATSHITADVD-R   UJ-846
USB Device: Bluetooth HCI, Up to 12 Mb/sec, 500 mA
USB Device: IR Receiver, Apple Computer, Inc., Up to 12 Mb/sec, 500 mA
USB Device: Microsoft Wheel Mouse Optical®, Microsoft, Up to 1.5 Mb/sec, 500 mA
USB Device: DELL USB Keyboard, DELL, Up to 1.5 Mb/sec, 500 mA
Comment 1 Tom Brown 2007-03-28 17:11:37 PDT
Sometimes the browser goes into spin-death instead of crashing. The following is a sample of the application during spin:

Analysis of sampling pid 20170 every 10.000000 milliseconds
Call graph:
    500 Thread_0f07
      500 0x5f6f9
        500 0x5f7de
          500 NSApplicationMain
            500 -[NSApplication run]
              500 0x6f96
                500 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]
                  500 _DPSNextEvent
                    500 BlockUntilNextEventMatchingListInMode
                      500 ReceiveNextEventCommon
                        500 RunCurrentEventLoopInMode
                          500 CFRunLoopRunInMode
                            500 CFRunLoopRunSpecific
                              500 WebCore::timerFired(__CFRunLoopTimer*, void*)
                                500 WebCore::TimerBase::sharedTimerFired()
                                  500 WebCore::TimerBase::fireTimers(double, WTF::Vector<WebCore::TimerBase*, (unsigned long)0> const&)
                                    500 WebCore::Timer<WebCore::EventHandler>::fired()
                                      500 WebCore::EventHandler::hoverTimerFired(WebCore::Timer<WebCore::EventHandler>*)
                                        500 WebCore::PlatformMouseEvent::PlatformMouseEvent[in-charge](WebCore::PlatformMouseEvent::CurrentEventTag const&)
                                          500 WebCore::globalPointForEvent(NSEvent*)
                                            500 WebCore::globalPoint(_NSPoint const&, NSWindow*)
                                              500 objc_msgSend
                                                500 objc_msgSend
    500 Thread_1003
      500 _pthread_body
        500 forkThreadForFunction
          500 +[NSURLConnection(NSURLConnectionInternal) _resourceLoadLoop:]
            500 CFRunLoopRunInMode
              500 CFRunLoopRunSpecific
                500 mach_msg_trap
                  500 mach_msg_trap
    500 Thread_1103
      500 _pthread_body
        500 forkThreadForFunction
          500 +[NSURLCache _diskCacheSyncLoop:]
            500 CFRunLoopRunInMode
              500 CFRunLoopRunSpecific
                500 mach_msg_trap
                  500 mach_msg_trap
    500 Thread_1203
      500 _pthread_body
        500 select
          500 select
    500 Thread_1303
      500 _pthread_body
        500 forkThreadForFunction
          500 -[AsyncDB _run:]
            500 -[NSConditionLock lockWhenCondition:]
              500 semaphore_wait_signal_trap
                500 semaphore_wait_signal_trap

Total number in stack (recursive counted multiple, when >=5):

Sort by top of stack, same collapsed (when >= 5):
        mach_msg_trap        1000
        objc_msgSend        500
        select        500
        semaphore_wait_signal_trap        500
Comment 2 Mark Rowe (bdash) 2007-03-28 23:36:08 PDT
This is in radar as <rdar://problem/5095977>.

Notes from the radar we may be able to use to find a reproducible case:
* NOTES
Some of the most recent comments:
* 103432617: Crash in Kerio WebMail (www.kerio.com).
It crashed after I saved e-mail message to Drafts.
* 102653902: Crash in Kerio WebMail (www.kerio.com), it happened when I saved message to Drafts.
* 100116488: .mac mail seems to crash Safari about 2 or 3 times a day with almost coninuous use.

I was not doing anything special, just responded to a mail (which does nto consistently crash it).
* 102387013: Crash in Kerio Webmail (www.kerio.com)
Comment 3 mitz 2007-03-29 00:13:11 PDT
Created attachment 13858 [details]
Possible fix

This should prevent the hover timer from being rearmed after the view is set to 0. It also adds an ASSERT that might make the bug more reliably reproducible (if it does not fix it) in debug builds. Tom (and others seeing the bug), I'd be interested to know whether you're still able to reproduce after applying this patch locally, and if you're doing a debug build, whether you hit the ASSERT.
Comment 4 mitz 2007-03-29 10:21:23 PDT
Some testing shows that [[NSApp currentEvent] window] can be a window that's been deallocated. Specifically, this can happen in the processing of a timer with 0 interval, since the event queue is apparently not polled again before the timer fires.

This and another look at the backtrace, lead me to conjecture that that's what's happening here. Bug 11705 already points at PlatformMouseEvent::PlatformMouseEvent(const CurrentEventTag&) as a potential source of trouble. I think hoverTimerFired() should use something else to fabricate a mouse move event.
Comment 5 Tom Brown 2007-03-29 11:23:37 PDT
Created attachment 13870 [details]
Test case reduction (zip file)

Open the "closewincrash/outer.html" file and follow the directions.
Comment 6 mitz 2007-03-29 11:39:26 PDT
Created attachment 13871 [details]
Another try

I could not get the reduction to crash locally.
Comment 7 mitz 2007-03-29 13:37:53 PDT
Comment on attachment 13871 [details]
Another try

Even scheduleHoverStateUpdate() is too late.
Comment 8 Tom Brown 2007-03-29 13:48:04 PDT
If you have trouble getting the test case to crash, try running it through a webserver. The crash reduction makes some AJAX calls which may be timed differently when not run through HTTP.
Comment 9 mitz 2007-03-29 13:55:07 PDT
(In reply to comment #8)
> If you have trouble getting the test case to crash, try running it through a
> webserver. The crash reduction makes some AJAX calls which may be timed
> differently when not run through HTTP.
> 

Doing that I did get the crash and I found out that scheduleHoverStateUpdate() can be called under a network callback, making [[NSApp currentEvent] window] bad even at that point. If platform mouse events are to be used, it seems that either the PlatformMouseEvent will need to be cached by the event handler when actually handling an event, or they will need to be fabricated in a way that doesn't rely on -currentEvent.
Comment 10 mitz 2007-03-29 14:44:18 PDT
Created attachment 13879 [details]
Create a fake mouse move event instead of using the current event
Comment 11 Tom Brown 2007-03-29 15:02:10 PDT
This latest patch seems to fix the bug, as well as the bug originally reported as bug #13124, and also seems to be a plausible solution for bug #11705 (though I haven't tested that one)
Comment 12 mitz 2007-03-29 16:48:42 PDT
Created attachment 13883 [details]
Create a fake mouse move event instead of using the current event

Includes a manual test.
Comment 13 mitz 2007-04-02 15:44:17 PDT
Created attachment 13928 [details]
Don't use mouse events at all for hover state update

A much simpler approach, suggested by Darin.
Comment 14 Darin Adler 2007-04-02 15:45:47 PDT
Comment on attachment 13928 [details]
Don't use mouse events at all for hover state update

Looks good. r=me

We should be sure to test cases that involve nested frames.
Comment 15 Mark Rowe (bdash) 2007-04-03 06:10:04 PDT
Landed in r20677.
Comment 16 mitz 2007-06-23 06:45:24 PDT
*** Bug 14308 has been marked as a duplicate of this bug. ***