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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Modern IDB: TransactionOperations from a worker thread might be destroyed on main thread"
href="https://bugs.webkit.org/show_bug.cgi?id=158004">158004</a>
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<th>Summary</th>
<td>Modern IDB: TransactionOperations from a worker thread might be destroyed on main thread
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
</td>
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<th>OS</th>
<td>Unspecified
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>WebCore Misc.
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>beidson@apple.com
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<pre>Modern IDB: TransactionOperations from a worker thread might be destroyed on main thread
This bug is spawned from <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - Modern IDB: Some blob tests ASSERT sometimes on the bots"
href="show_bug.cgi?id=157525">https://bugs.webkit.org/show_bug.cgi?id=157525</a>
An example of this happening on the bots is here: <a href="https://bugs.webkit.org/attachment.cgi?id=278975">https://bugs.webkit.org/attachment.cgi?id=278975</a>
The big problem is in IDBConnectionProxy:
template<typename T, typename... Parameters, typename... Arguments>
void performCallbackOnCorrectThread(T& object, void (T::*method)(Parameters...), Arguments&&... arguments)
{
ASSERT(isMainThread());
if (object.originThreadID() == currentThread()) {
(object.*method)(arguments...);
return;
}
ScriptExecutionContext* context = object.scriptExecutionContext();
if (!context)
return;
context->postCrossThreadTask(object, method, arguments...);
}
It is possible that the worker thread's context has been stopped by the time a TransactionOperation that was created on the worker thread is completed.
In that case, it falls into the "if (!context) return;" clause.
And when it does that, the operation will be released on the main thread, which is its only option.</pre>
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