<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>75048</bug_id>
          
          <creation_ts>2011-12-21 15:26:00 -0800</creation_ts>
          <short_desc>REGRESSION(r103429) - fast/workers/storage/use-same-database-in-page-and-workers.html asserts</short_desc>
          <delta_ts>2012-02-14 23:04:06 -0800</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>WebCore Misc.</component>
          <version>528+ (Nightly build)</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords></keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Adrienne Walker">enne</reporter>
          <assigned_to name="Hao Zheng">zhenghao</assigned_to>
          <cc>dslomov</cc>
    
    <cc>enne</cc>
    
    <cc>levin</cc>
    
    <cc>levin+threading</cc>
    
    <cc>michaeln</cc>
    
    <cc>webkit.review.bot</cc>
    
    <cc>zhenghao</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>525716</commentid>
    <comment_count>0</comment_count>
    <who name="Adrienne Walker">enne</who>
    <bug_when>2011-12-21 15:26:00 -0800</bug_when>
    <thetext>From http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fworkers%2Fstorage%2Fuse-same-database-in-page-and-workers.html&amp;showExpectations=true:

ERROR: Unable to turn on incremental auto-vacuum (0 not an error)
ERROR: Unable to turn on incremental auto-vacuum (0 not an error)
ERROR: Error (5) reading text result from database (SELECT value FROM __WebKitDatabaseInfoTable__ WHERE key = &apos;WebKitDatabaseVersionKey&apos;;)
ERROR: Failed to retrieve version from database file://::UseSameDatabaseInPageAndWorkers
ERROR: Error (9) preparing statement to read text result from database (SELECT value FROM __WebKitDatabaseInfoTable__ WHERE key = &apos;WebKitDatabaseVersionKey&apos;;)
ERROR: Failed to retrieve version from database file://::UseSameDatabaseInPageAndWorkers
ASSERTION FAILED: m_workerContext-&gt;hasOneRef()</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>525736</commentid>
    <comment_count>1</comment_count>
    <who name="Adrienne Walker">enne</who>
    <bug_when>2011-12-21 15:38:54 -0800</bug_when>
    <thetext>Committed r103466: &lt;http://trac.webkit.org/changeset/103466&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>552980</commentid>
    <comment_count>2</comment_count>
    <who name="Hao Zheng">zhenghao</who>
    <bug_when>2012-02-09 02:18:05 -0800</bug_when>
    <thetext>The ASSERT is triggered because the test timed out and cleanup is not done properly. If timeout of DRT is set to a smaller value, the crash is easily to reproduce (e.g. change m_timeout in TestShell.cpp to 6 * 1000).</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>555189</commentid>
    <comment_count>3</comment_count>
      <attachid>126756</attachid>
    <who name="Hao Zheng">zhenghao</who>
    <bug_when>2012-02-13 04:52:19 -0800</bug_when>
    <thetext>Created attachment 126756
Proposed patch.

I uploaded an initial patch for the crash. Code needs more polish, but I want to have it reviewed by you first in case I&apos;m not going on the right way.

2 problems with my patch are:
- Added one variable to Task. Maybe the better way is to create a new subclass of Task, but I found it very hard to make it right, replacing createCallbackTask as much cross thread trick is involved.
- A smaller one: shouldn&apos;t use PassOwnPtr as local variable. I tried to change it as RefPtr, but it doesn&apos;t compile.

I need your helpful comment on both of them.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>555191</commentid>
    <comment_count>4</comment_count>
    <who name="Hao Zheng">zhenghao</who>
    <bug_when>2012-02-13 05:03:27 -0800</bug_when>
    <thetext>BTW, you can trigger the crash by increasing WORKER_COUNT to 5 in the test html, without changing timeout value in DRT.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>555442</commentid>
    <comment_count>5</comment_count>
      <attachid>126756</attachid>
    <who name="Michael Nordman">michaeln</who>
    <bug_when>2012-02-13 12:03:57 -0800</bug_when>
    <thetext>Comment on attachment 126756
Proposed patch.

Thank you for looking into this bug.

View in context: https://bugs.webkit.org/attachment.cgi?id=126756&amp;action=review

&gt; Source/WebCore/storage/Database.cpp:221
&gt; +    m_transactionQueue.clear();

Does this call have to be made with the m_transactionInProgressMutex lock held? It&apos;s Deque which is not a thread-safe container, and all other accesses are made under that lock.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>555444</commentid>
    <comment_count>6</comment_count>
    <who name="Dmitry Lomov">dslomov</who>
    <bug_when>2012-02-13 12:07:45 -0800</bug_when>
    <thetext>(In reply to comment #3)
&gt; Created an attachment (id=126756) [details]
&gt; Proposed patch.

Hao,

thank you for finding out a root cause for the issue - much appreciated!

&gt; 
&gt; I uploaded an initial patch for the crash. Code needs more polish, but I want to have it reviewed by you first in case I&apos;m not going on the right way.
&gt; 
&gt; 2 problems with my patch are:
&gt; - Added one variable to Task. Maybe the better way is to create a new subclass of Task, but I found it very hard to make it right, replacing createCallbackTask as much cross thread trick is involved.

Adding a variable to ScriptExecutionContext::Task is not really acceptable. Being a cleanup task is not really a settable property of a task; each class of tasks is either a clean-up task or not. See http://trac.webkit.org/browser/trunk/Source/WebCore/storage/chromium/DatabaseTrackerChromium.cpp for examples of how to derive clean-up tasks from ScriptExecutionContext::Task.

&gt; - A smaller one: shouldn&apos;t use PassOwnPtr as local variable. I tried to change it as RefPtr, but it doesn&apos;t compile.

I think using PassOwnPtr in this situation is fine (otherwise you&apos;d need a dance with leakPtrs), but due to my large point of not making cleanUpTak property settable the whole thing is moot. 
&gt; 
&gt; I need your helpful comment on both of them.

I hope the above is helpful :)
Let me know if you need further info. I&apos;ll be happy to help further.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>555481</commentid>
    <comment_count>7</comment_count>
    <who name="David Levin">levin</who>
    <bug_when>2012-02-13 12:55:33 -0800</bug_when>
    <thetext>(In reply to comment #3)
&gt; Created an attachment (id=126756) [details]
&gt; - A smaller one: shouldn&apos;t use PassOwnPtr as local variable. I tried to change it as RefPtr, but it doesn&apos;t compile.

Use OwnPtr (not RefPtr).</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>555959</commentid>
    <comment_count>8</comment_count>
    <who name="Hao Zheng">zhenghao</who>
    <bug_when>2012-02-13 22:34:40 -0800</bug_when>
    <thetext>(In reply to comment #5)
&gt; (From update of attachment 126756 [details])
&gt; Thank you for looking into this bug.
&gt; 
&gt; View in context: https://bugs.webkit.org/attachment.cgi?id=126756&amp;action=review
&gt; 
&gt; &gt; Source/WebCore/storage/Database.cpp:221
&gt; &gt; +    m_transactionQueue.clear();
&gt; 
&gt; Does this call have to be made with the m_transactionInProgressMutex lock held? It&apos;s Deque which is not a thread-safe container, and all other accesses are made under that lock.

Good point.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>556079</commentid>
    <comment_count>9</comment_count>
      <attachid>126928</attachid>
    <who name="Hao Zheng">zhenghao</who>
    <bug_when>2012-02-14 01:11:50 -0800</bug_when>
    <thetext>Created attachment 126928
Proposed patch 2.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>556085</commentid>
    <comment_count>10</comment_count>
    <who name="Hao Zheng">zhenghao</who>
    <bug_when>2012-02-14 01:15:32 -0800</bug_when>
    <thetext>(In reply to comment #6)
&gt; (In reply to comment #3)
&gt; &gt; Created an attachment (id=126756) [details] [details]
&gt; &gt; Proposed patch.
&gt; 
&gt; Hao,
&gt; 
&gt; thank you for finding out a root cause for the issue - much appreciated!
&gt; 
&gt; &gt; 
&gt; &gt; I uploaded an initial patch for the crash. Code needs more polish, but I want to have it reviewed by you first in case I&apos;m not going on the right way.
&gt; &gt; 
&gt; &gt; 2 problems with my patch are:
&gt; &gt; - Added one variable to Task. Maybe the better way is to create a new subclass of Task, but I found it very hard to make it right, replacing createCallbackTask as much cross thread trick is involved.
&gt; 
&gt; Adding a variable to ScriptExecutionContext::Task is not really acceptable. Being a cleanup task is not really a settable property of a task; each class of tasks is either a clean-up task or not. See http://trac.webkit.org/browser/trunk/Source/WebCore/storage/chromium/DatabaseTrackerChromium.cpp for examples of how to derive clean-up tasks from ScriptExecutionContext::Task.
&gt; 

Done.

&gt; &gt; - A smaller one: shouldn&apos;t use PassOwnPtr as local variable. I tried to change it as RefPtr, but it doesn&apos;t compile.
&gt; 
&gt; I think using PassOwnPtr in this situation is fine (otherwise you&apos;d need a dance with leakPtrs), but due to my large point of not making cleanUpTak property settable the whole thing is moot. 
&gt; &gt; 
&gt; &gt; I need your helpful comment on both of them.
&gt; 
&gt; I hope the above is helpful :)
&gt; Let me know if you need further info. I&apos;ll be happy to help further.

Thanks. PTAL</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>556342</commentid>
    <comment_count>11</comment_count>
      <attachid>126928</attachid>
    <who name="Dmitry Lomov">dslomov</who>
    <bug_when>2012-02-14 09:24:33 -0800</bug_when>
    <thetext>Comment on attachment 126928
Proposed patch 2.

View in context: https://bugs.webkit.org/attachment.cgi?id=126928&amp;action=review

Looks good to me

&gt; Source/WebCore/ChangeLog:17
&gt; +        No new tests. (OOPS!)

Remove the OOPS (this is covered with existing tests).

&gt; Source/WebCore/ChangeLog:20
&gt; +        * dom/ScriptExecutionContext.h:

Remove unchanged file from ChangeLog</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>556574</commentid>
    <comment_count>12</comment_count>
      <attachid>126928</attachid>
    <who name="David Levin">levin</who>
    <bug_when>2012-02-14 14:00:02 -0800</bug_when>
    <thetext>Comment on attachment 126928
Proposed patch 2.

View in context: https://bugs.webkit.org/attachment.cgi?id=126928&amp;action=review

Please consider addressing the above comments and then it looks good.

&gt; Source/WebCore/ChangeLog:25
&gt; +        (WebCore::Database::close):

It would be nice to add a comment here about why &quot;close&quot; is added. I think you explained it above but it should just be removed from that big paragraph and put here instead.

&gt; Source/WebCore/ChangeLog:27
&gt; +        (WebCore::SQLCallbackWrapper::clear):

Explanation from above should go here and be removed from above

&quot; turn SafeReleaseTask
        into a cleanup task, which is necessary because at the time of
        SafeReleaseTask is performed, WorkerRunLoop has been terminated
       and only runs cleanup tasks.&quot;

&gt; Source/WebCore/storage/SQLCallbackWrapper.h:78
&gt; +            CrossThreadCopier&lt; AllowAccessLaterWrapper&lt;T&gt; &gt;::copy(AllowAccessLater(callback))));

Just evaluate &quot;CrossThreadCopier&lt; AllowAccessLaterWrapper&lt;T&gt; &gt;::copy(AllowAccessLater(callback))&quot; by hand and replace this with the result.  I believe that the result is &quot;callback&quot;

Much simpler :).</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>556589</commentid>
    <comment_count>13</comment_count>
      <attachid>126928</attachid>
    <who name="Michael Nordman">michaeln</who>
    <bug_when>2012-02-14 14:10:14 -0800</bug_when>
    <thetext>Comment on attachment 126928
Proposed patch 2.

View in context: https://bugs.webkit.org/attachment.cgi?id=126928&amp;action=review

&gt;&gt; Source/WebCore/storage/SQLCallbackWrapper.h:78
&gt;&gt; +            CrossThreadCopier&lt; AllowAccessLaterWrapper&lt;T&gt; &gt;::copy(AllowAccessLater(callback))));
&gt; 
&gt; Just evaluate &quot;CrossThreadCopier&lt; AllowAccessLaterWrapper&lt;T&gt; &gt;::copy(AllowAccessLater(callback))&quot; by hand and replace this with the result.  I believe that the result is &quot;callback&quot;
&gt; 
&gt; Much simpler :).

yes please... simpler is better... i was wondering what that inscrutable line of code resulted in :)</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>556865</commentid>
    <comment_count>14</comment_count>
      <attachid>127100</attachid>
    <who name="Hao Zheng">zhenghao</who>
    <bug_when>2012-02-14 18:56:14 -0800</bug_when>
    <thetext>Created attachment 127100
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>556866</commentid>
    <comment_count>15</comment_count>
    <who name="Hao Zheng">zhenghao</who>
    <bug_when>2012-02-14 18:58:08 -0800</bug_when>
    <thetext>(In reply to comment #11)
&gt; (From update of attachment 126928 [details])
&gt; View in context: https://bugs.webkit.org/attachment.cgi?id=126928&amp;action=review
&gt; 
&gt; Looks good to me
&gt; 
&gt; &gt; Source/WebCore/ChangeLog:17
&gt; &gt; +        No new tests. (OOPS!)
&gt; 

Done

&gt; Remove the OOPS (this is covered with existing tests).
&gt; 
&gt; &gt; Source/WebCore/ChangeLog:20
&gt; &gt; +        * dom/ScriptExecutionContext.h:
&gt; 
&gt; Remove unchanged file from ChangeLog

Done. I forgot to change ChangeLog.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>556867</commentid>
    <comment_count>16</comment_count>
    <who name="Hao Zheng">zhenghao</who>
    <bug_when>2012-02-14 19:01:37 -0800</bug_when>
    <thetext>(In reply to comment #12)
&gt; (From update of attachment 126928 [details])
&gt; View in context: https://bugs.webkit.org/attachment.cgi?id=126928&amp;action=review
&gt; 
&gt; Please consider addressing the above comments and then it looks good.
&gt; 
&gt; &gt; Source/WebCore/ChangeLog:25
&gt; &gt; +        (WebCore::Database::close):
&gt; 
&gt; It would be nice to add a comment here about why &quot;close&quot; is added. I think you explained it above but it should just be removed from that big paragraph and put here instead.
&gt; 

Done.

&gt; &gt; Source/WebCore/ChangeLog:27
&gt; &gt; +        (WebCore::SQLCallbackWrapper::clear):
&gt; 
&gt; Explanation from above should go here and be removed from above
&gt; 
&gt; &quot; turn SafeReleaseTask
&gt;         into a cleanup task, which is necessary because at the time of
&gt;         SafeReleaseTask is performed, WorkerRunLoop has been terminated
&gt;        and only runs cleanup tasks.&quot;
&gt; 

Done.

&gt; &gt; Source/WebCore/storage/SQLCallbackWrapper.h:78
&gt; &gt; +            CrossThreadCopier&lt; AllowAccessLaterWrapper&lt;T&gt; &gt;::copy(AllowAccessLater(callback))));
&gt; 
&gt; Just evaluate &quot;CrossThreadCopier&lt; AllowAccessLaterWrapper&lt;T&gt; &gt;::copy(AllowAccessLater(callback))&quot; by hand and replace this with the result.  I believe that the result is &quot;callback&quot;
&gt; 
&gt; Much simpler :).

Good point. Actually, I just inlined all the old macro here to add one methd isCleanupTask(). As it&apos;s really a cross thread task, I don&apos;t realize I can inline more core here. Thanks for the comment.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>556952</commentid>
    <comment_count>17</comment_count>
      <attachid>127100</attachid>
    <who name="WebKit Review Bot">webkit.review.bot</who>
    <bug_when>2012-02-14 23:04:01 -0800</bug_when>
    <thetext>Comment on attachment 127100
Patch

Clearing flags on attachment: 127100

Committed r107784: &lt;http://trac.webkit.org/changeset/107784&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>556953</commentid>
    <comment_count>18</comment_count>
    <who name="WebKit Review Bot">webkit.review.bot</who>
    <bug_when>2012-02-14 23:04:06 -0800</bug_when>
    <thetext>All reviewed patches have been landed.  Closing bug.</thetext>
  </long_desc>
      
          <attachment
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              isprivate="0"
          >
            <attachid>126756</attachid>
            <date>2012-02-13 04:52:19 -0800</date>
            <delta_ts>2012-02-14 01:11:50 -0800</delta_ts>
            <desc>Proposed patch.</desc>
            <filename>worker.crash.patch</filename>
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            <attacher name="Hao Zheng">zhenghao</attacher>
            
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            <attachid>126928</attachid>
            <date>2012-02-14 01:11:50 -0800</date>
            <delta_ts>2012-02-14 18:56:06 -0800</delta_ts>
            <desc>Proposed patch 2.</desc>
            <filename>worker.crash.patch</filename>
            <type>text/plain</type>
            <size>3788</size>
            <attacher name="Hao Zheng">zhenghao</attacher>
            
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            <date>2012-02-14 18:56:14 -0800</date>
            <delta_ts>2012-02-14 23:04:01 -0800</delta_ts>
            <desc>Patch</desc>
            <filename>bug-75048-20120215105612.patch</filename>
            <type>text/plain</type>
            <size>5963</size>
            <attacher name="Hao Zheng">zhenghao</attacher>
            
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</data>

          </attachment>
      

    </bug>

</bugzilla>