[Webkit-unassigned] [Bug 221115] New: [WPE] Rare flaky crashes in WTRController in multiple tests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221115

            Bug ID: 221115
           Summary: [WPE] Rare flaky crashes in WTRController in multiple
                    tests
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WPE WebKit
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: lmoura at igalia.com
                CC: bugs-noreply at webkitgtk.org

>From time to time, some tests hit some WTF::Deque::checkValidity assertions deep inside the WTR::TestController.

There are small variations in the stack up to checkValidity and inside it but they have some portions in common. Namely, the following snippet:

#6  0x0000561b672cf4ba in WTF::Deque<WTF::Function<void ()>, 0ul>::append(WTF::Function<void ()>&&) (this=0x7f58b0367040, value=...) at ../../Source/WTF/wtf/Deque.h:89
#7  0x0000561b672ce51b in WTF::RunLoop::dispatch(WTF::Function<void ()>&&) (this=0x7f58b0367000, function=...) at ../../Source/WTF/wtf/RunLoop.cpp:146
#8  0x0000561b67358329 in WTF::WorkQueue::platformInvalidate() (this=0x7f58b0396a50) at ../../Source/WTF/wtf/generic/WorkQueueGeneric.cpp:51
#9  0x0000561b6731376c in WTF::WorkQueue::~WorkQueue() (this=0x7f58b0396a50, __in_chrg=<optimized out>) at ../../Source/WTF/wtf/WorkQueue.cpp:54
#10 0x0000561b67313794 in WTF::WorkQueue::~WorkQueue() (this=0x7f58b0396a50, __in_chrg=<optimized out>) at ../../Source/WTF/wtf/WorkQueue.cpp:55
#11 0x0000561b66948e3e in WTF::ThreadSafeRefCounted<WTF::FunctionDispatcher, (WTF::DestructionThread)0>::deref() const::{lambda()#1}::operator()() const (this=0x7ffe9d297810) at DerivedSources/ForwardingHeaders/wtf/ThreadSafeRefCounted.h:117
#12 0x0000561b66948e85 in WTF::ThreadSafeRefCounted<WTF::FunctionDispatcher, (WTF::DestructionThread)0>::deref() const (this=0x7f58b0396a58) at DerivedSources/ForwardingHeaders/wtf/ThreadSafeRefCounted.h:135
#13 0x0000561b66a9f1b4 in WTF::Ref<WTF::WorkQueue, WTF::RawPtrTraits<WTF::WorkQueue> >::~Ref() (this=0x7f58b03972f0, __in_chrg=<optimized out>) at DerivedSources/ForwardingHeaders/wtf/Ref.h:61

The bottom of the stack also varies a bit starting from restStateToConsistentValues(). For example, starting either in ~ContentRuleListStore (TestController::resetContentExtensions()) or from ~Connection (TestController::clearIndexedDatabases()).

So far, no luck trying to reproduce locally, even getting the same list of tests of the worker that crashed.

Detailed crash logs in the following comments.

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