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From "Tom Clarkson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-1404) EXC_BAD_ACCESS when using XHR bridge mode
Date Mon, 10 Sep 2012 13:48:07 GMT

    [ https://issues.apache.org/jira/browse/CB-1404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13451974#comment-13451974
] 

Tom Clarkson commented on CB-1404:
----------------------------------

I wasn't able to get a useful stack trace - there are no callers on the crashed thread, and
none of the other threads show any user code. 

There is a possibility that there is a safari bug involved - I found a reference to an issue
with cancelling requests (http://stackoverflow.com/a/8326429/101970) that while not an exact
match, would explain the issue going away with XHR_NO_PAYLOAD - an empty request is unlikely
to need cancelling.

WebCore`WebCore::DocumentThreadableLoader::cancel():
0x337d8018:  push   {r4, r5, r7, lr}
0x337d801a:  add    r7, sp, #8
0x337d801c:  ldr    r1, [r0, #12]
0x337d801e:  cmp    r1, #0
0x337d8020:  it     eq
0x337d8022:  popeq  {r4, r5, r7, pc}
0x337d8024:  mov    r4, r0
0x337d8026:  mov    r0, r1
0x337d8028:  bl     #-1208228                ; 0x336b1088 WebCore::ResourceLoader::cancel()
0x337d802c:  movs   r5, #0
0x337d802e:  ldr    r0, [r4, #12]
0x337d8030:  str.w  r5, [r0, #564]         << Thread 5 WebThread EXC_BAD_ACCESS (code=1,
address 0x234)
0x337d8034:  ldr    r1, [r4, #12]
0x337d8036:  str    r5, [r4, #12]
0x337d8038:  cbz    r1, 0x337d8058           ; WebCore::DocumentThreadableLoader::cancel()
+ 64
0x337d803a:  mov    r0, r1
0x337d803c:  ldr    r2, [r0, #4]!
0x337d8040:  cmp    r2, #1
0x337d8042:  beq    0x337d804c               ; WebCore::DocumentThreadableLoader::cancel()
+ 52
0x337d8044:  subs   r0, r2, #1
0x337d8046:  str    r0, [r1, #4]
0x337d8048:  str    r5, [r4, #16]
0x337d804a:  pop    {r4, r5, r7, pc}
0x337d804c:  cmp    r0, #4
0x337d804e:  beq    0x337d8058               ; WebCore::DocumentThreadableLoader::cancel()
+ 64
0x337d8050:  ldr    r1, [r0, #-4]!
0x337d8054:  ldr    r1, [r1, #4]
0x337d8056:  blx    r1                       
0x337d8058:  str    r5, [r4, #16]
0x337d805a:  pop    {r4, r5, r7, pc}
                
> EXC_BAD_ACCESS when using XHR bridge mode
> -----------------------------------------
>
>                 Key: CB-1404
>                 URL: https://issues.apache.org/jira/browse/CB-1404
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: iOS
>    Affects Versions: 2.1.0
>         Environment: iPad 2, iOS 5.1.1
>            Reporter: Tom Clarkson
>            Assignee: Andrew Grieve
>
> When calling a plugin the app crashes on WebThread with EXC_BAD_ACCESS in WebCore::DocumentThreadableLoader::cancel.
> This appears to be some sort of timing issue, as it does not happen on every call - I
am seeing it in an autosave function which makes lots of calls to PGSQLitePlugin. 
> The error did not appear before upgrading to 2.1, and setting the bridge mode to IFRAME_NAV
restores the previous behaviour (no crashes, but odd scrolling functionality).
> Setting the bridge mode to XHR_NO_PAYLOAD also seems to fix it - not sure if removing
the payload actually does anything different or just makes it fast enough that the timing
condition does not come up in normal app usage.
>   

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