Bug 209977 – REGRESSION (r259383-259384): ASSERTION FAILED: 'Completion handler should always be called' seen with http/wpt/service-workers/service-worker-different-process.https.html

• Component: New Bugs
• Status: RESOLVED FIXED

[Ryan Haddad]

The following is seen on iOS and macOS debug bots with http/wpt/service-workers/service-worker-different-process.https.html

ASSERTION FAILED: Completion handler should always be called
!m_function
/Volumes/Data/slave/catalina-debug/build/WebKitBuild/Debug/usr/local/include/wtf/CompletionHandler.h(53) : WTF::CompletionHandler<void (IPC::Decoder *)>::~CompletionHandler()
1   0x10b99ef29 WTFCrash
2   0x11281c037 WTF::CompletionHandler<void (IPC::Decoder*)>::~CompletionHandler()
3   0x1127fba95 WTF::CompletionHandler<void (IPC::Decoder*)>::~CompletionHandler()
4   0x112b35a45 std::__1::pair<WTF::CompletionHandler<void (IPC::Decoder*)>, unsigned long long>::~pair()
5   0x112b35a05 std::__1::pair<WTF::CompletionHandler<void (IPC::Decoder*)>, unsigned long long>::~pair()
6   0x112b359cf WTF::Optional_base<std::__1::pair<WTF::CompletionHandler<void (IPC::Decoder*)>, unsigned long long> >::~Optional_base()
7   0x112b35998 WTF::Optional<std::__1::pair<WTF::CompletionHandler<void (IPC::Decoder*)>, unsigned long long> >::~Optional()
8   0x112b35575 WTF::Optional<std::__1::pair<WTF::CompletionHandler<void (IPC::Decoder*)>, unsigned long long> >::~Optional()
9   0x113475746 WebKit::AuxiliaryProcessProxy::PendingMessage::~PendingMessage()
10  0x11346f2d5 WebKit::AuxiliaryProcessProxy::PendingMessage::~PendingMessage()
11  0x11347801f WTF::VectorDestructor<true, WebKit::AuxiliaryProcessProxy::PendingMessage>::destruct(WebKit::AuxiliaryProcessProxy::PendingMessage*, WebKit::AuxiliaryProcessProxy::PendingMessage*)
12  0x113477f7d WTF::VectorTypeOperations<WebKit::AuxiliaryProcessProxy::PendingMessage>::destruct(WebKit::AuxiliaryProcessProxy::PendingMessage*, WebKit::AuxiliaryProcessProxy::PendingMessage*)
13  0x113477f40 WTF::Vector<WebKit::AuxiliaryProcessProxy::PendingMessage, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>::~Vector()
14  0x11346e895 WTF::Vector<WebKit::AuxiliaryProcessProxy::PendingMessage, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>::~Vector()
15  0x11346e7c1 WebKit::AuxiliaryProcessProxy::~AuxiliaryProcessProxy()
16  0x1136b17c7 WebKit::WebProcessProxy::~WebProcessProxy()
17  0x1136b1c55 WebKit::WebProcessProxy::~WebProcessProxy()
18  0x1136b1cdc WebKit::WebProcessProxy::~WebProcessProxy()
19  0x1133026e4 WTF::ThreadSafeRefCounted<WebKit::WebProcessProxy, (WTF::DestructionThread)0>::deref() const::'lambda'()::operator()() const
20  0x11330267d WTF::ThreadSafeRefCounted<WebKit::WebProcessProxy, (WTF::DestructionThread)0>::deref() const
21  0x11330262e WebKit::WebProcessProxy::deref()
22  0x11356a58e void WTF::derefIfNotNull<WebKit::WebProcessProxy>(WebKit::WebProcessProxy*)
23  0x11356a559 WTF::RefPtr<WebKit::WebProcessProxy, WTF::DumbPtrTraits<WebKit::WebProcessProxy> >::~RefPtr()
24  0x1135316b5 WTF::RefPtr<WebKit::WebProcessProxy, WTF::DumbPtrTraits<WebKit::WebProcessProxy> >::~RefPtr()
25  0x1136a3fe1 WebKit::WebProcessPool::disconnectProcess(WebKit::WebProcessProxy*)
26  0x113698d0d WebKit::WebProcessProxy::shutDown()
27  0x1136b258c WebKit::WebProcessProxy::maybeShutDown()
28  0x1136a959c WebKit::WebProcessProxy::disableServiceWorkers()
29  0x11369fc63 WebKit::WebProcessPool::terminateServiceWorkers()
30  0x1136b00d7 WebKit::WebProcessPool::setUseSeparateServiceWorkerProcess(bool)
31  0x113848fce WKContextSetUseSeparateServiceWorkerProcess

https://results.webkit.org/?suite=layout-tests&test=http%2Fwpt%2Fservice-workers%2Fservice-worker-different-process.https.html

[Ryan Haddad]

Created attachment 395396 [details]
crash log

[Ryan Haddad]

rdar://61264668

[youenn fablet]

Created attachment 395669 [details]
Patch

[EWS]

Committed r259640: <https://trac.webkit.org/changeset/259640>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 395669 [details].

[Darin Adler]

Comment on attachment 395669 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=395669&action=review

> Source/WebKit/UIProcess/AuxiliaryProcessProxy.cpp:52
> +    auto pendingMessages = WTFMove(m_pendingMessages);
> +    for (auto& pendingMessage : pendingMessages) {

You can write it like this:

   for (auto& message : std::exchange(m_pendingMessages, { }))

I think it’s better.