Bug 172434 – Crash when IndexedDB's getAll is used inside a Web Worker

• Status: RESOLVED
• Resolution: FIXED
• Component: WebCore Misc.

When using IndexedDB's getAll function inside a Web Worker, Safari crashes. It works outside of a web worker.

Here's some example code:

    const errorHandler = function (event) {
      console.error(event.target.error);
    }

    console.log('Deleting database...');
    var deleteRequest = indexedDB.deleteDatabase('test');
    deleteRequest.onerror = deleteRequest.onblocked = deleteRequest.onsuccess = function () {
      console.log('Opening database...');
      var openRequest = indexedDB.open('test');
      openRequest.onerror = errorHandler;
      openRequest.onupgradeneeded = function () {
        var db = openRequest.result;
        db.createObjectStore('test', {keyPath: 'a'});
      }
      openRequest.onsuccess = function (event) {
        var db = event.target.result;

        var tx = db.transaction('test', 'readwrite');
        tx.onerror = errorHandler;
        tx.onabort = errorHandler;
        tx.oncomplete = function () {
          console.log('All done!');
        };

        var getAllRequest = tx.objectStore('test').getAll();
        getAllRequest.onerror = errorHandler;
        getAllRequest.onsuccess = function () {
          console.log('Success!');
        };
      };
    };

Running that code outside of a Web Worker is no problem: http://dumbmatter.com/safari-getall-worker-bug/

But inside a Web Worker, it will crash Safari (but not Firefox or Chrome): http://dumbmatter.com/safari-getall-worker-bug/worker.html

[Brady Eidson]

Whoa...  it's not a WebCore crash at all, but rather a bmalloc crash:

Thread 9 Crashed:: WebCore: Worker
0   com.apple.JavaScriptCore      	0x00000001070cf95b bmalloc::Heap::splitAndAllocate(bmalloc::LargeRange&, unsigned long, unsigned long) + 27
1   com.apple.JavaScriptCore      	0x00000001070cfd7d bmalloc::Heap::tryAllocateLarge(std::__1::lock_guard<bmalloc::StaticMutex>&, unsigned long, unsigned long) + 253
2   com.apple.JavaScriptCore      	0x00000001070cfda9 bmalloc::Heap::allocateLarge(std::__1::lock_guard<bmalloc::StaticMutex>&, unsigned long, unsigned long) + 9
3   com.apple.JavaScriptCore      	0x00000001070cd164 bmalloc::Allocator::allocateLarge(unsigned long) + 68
4   com.apple.JavaScriptCore      	0x000000010662277f WTF::fastMalloc(unsigned long) + 111
5   com.apple.WebCore             	0x0000000104d03d6b WebCore::IDBValue::IDBValue(WebCore::IDBValue const&) + 107
6   ???                           	0x000070000e6ceb80 0 + 123145544330112

[Radar WebKit Bug Importer]

<rdar://problem/32319936>

[Brady Eidson]

Note in the crash https://gist.github.com/battaile/abe7be0cf3f3d406b43f3e66ed4bd8c3 linked from https://github.com/dumbmatter/basketball-gm/issues/204#issuecomment-302978569, the crash on the worker thread was different:

Thread 18 Crashed:: WebCore: Worker
0   com.apple.WebCore             	0x00000001060ac720 void WTF::__copy_construct_op_table<WTF::Variant<WTF::Vector<WebCore::IDBKeyData, 0ul, WTF::CrashOnOverflow, 16ul>, WTF::Vector<WebCore::IDBValue, 0ul, WTF::CrashOnOverflow, 16ul>, std::nullptr_t>, WTF::__index_sequence<0l, 1l, 2l> >::__copy_construct_func<0l>(WTF::Variant<WTF::Vector<WebCore::IDBKeyData, 0ul, WTF::CrashOnOverflow, 16ul>, WTF::Vector<WebCore::IDBValue, 0ul, WTF::CrashOnOverflow, 16ul>, std::nullptr_t>*, WTF::Variant<WTF::Vector<WebCore::IDBKeyData, 0ul, WTF::CrashOnOverflow, 16ul>, WTF::Vector<WebCore::IDBValue, 0ul, WTF::CrashOnOverflow, 16ul>, std::nullptr_t> const&) + 0
1   ???                           	0x00007000008c3bc0 0 + 123145311501248

[Brady Eidson]

Created attachment 312514 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 312514 [details]
Patch

Clearing flags on attachment: 312514

Committed r218041: <http://trac.webkit.org/changeset/218041>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.