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  1. Realm JavaScript SDK
  2. RJS-721

6.0.3 iOS native crash - Attempted to dereference null pointer.

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    • Type: Icon: Bug Bug
    • Resolution: Gone away
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: None

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      Goals

      Regular offline use (no syncing)

      Expected Results

      No crashes

      Actual Results

      Random crash due to garbage / null reference.

      The following crash was reported from Realm code.

      EXC_BAD_ACCESS Attempted to dereference null pointer. 
    Tenant Move-In realm::jsc::ObjectWrap<realm::js::SessionClass<realm::jsc::Types> >::set_readonly_property(OpaqueJSContext const*, OpaqueJSValue*, OpaqueJSString*, OpaqueJSValue const*, OpaqueJSValue const**)
    Tenant Move-In bool realm::js::wrap<&realm::js::ListClass<realm::jsc::Types>::set_index>(OpaqueJSContext const*, OpaqueJSValue*, unsigned int, OpaqueJSValue const*, OpaqueJSValue const**)
    Tenant Move-In bool realm::js::wrap<&realm::js::ListClass<realm::jsc::Types>::set_index>(OpaqueJSContext const*, OpaqueJSValue*, unsigned int, OpaqueJSValue const*, OpaqueJSValue const**)
    Tenant Move-In OpaqueJSValue const* realm::js::wrap<&realm::js::RealmClass<realm::jsc::Types>::get_is_partial_realm>(OpaqueJSContext const*, OpaqueJSValue*, OpaqueJSString*, OpaqueJSValue const**)
    Tenant Move-In OpaqueJSValue const* realm::js::wrap<&realm::js::RealmClass<realm::jsc::Types>::object_for_primary_key>(OpaqueJSContext const*, OpaqueJSValue*, OpaqueJSValue*, unsigned long, OpaqueJSValue const* const*, OpaqueJSValue const**)
    Frameworks/JavaScriptCore.framework/JavaScriptCore long long JSC::APICallbackFunction::call<JSC::JSCallbackFunction>(JSC::JSGlobalObject*, JSC::CallFrame*)
    Frameworks/JavaScriptCore.framework/JavaScriptCore _llint_entry
    Frameworks/JavaScriptCore.framework/JavaScriptCore _llint_entry
    Frameworks/JavaScriptCore.framework/JavaScriptCore _llint_entry
    Frameworks/JavaScriptCore.framework/JavaScriptCore _vmEntryToJavaScript
    Frameworks/JavaScriptCore.framework/JavaScriptCore JSC::Interpreter::executeCall(JSC::JSGlobalObject*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&)
    Frameworks/JavaScriptCore.framework/JavaScriptCore JSC::profiledCall(JSC::JSGlobalObject*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&)
    Frameworks/JavaScriptCore.framework/JavaScriptCore _JSObjectCallAsFunction
    Tenant Move-In OpaqueJSValue const* realm::js::wrap<&realm::js::RealmClass<realm::jsc::Types>::get_is_partial_realm>(OpaqueJSContext const*, OpaqueJSValue*, OpaqueJSString*, OpaqueJSValue const**)
    Tenant Move-In OpaqueJSValue const* realm::js::wrap<&realm::js::RealmClass<realm::jsc::Types>::write>(OpaqueJSContext const*, OpaqueJSValue*, OpaqueJSValue*, unsigned long, OpaqueJSValue const* const*, OpaqueJSValue const**)
    Frameworks/JavaScriptCore.framework/JavaScriptCore long long JSC::APICallbackFunction::call<JSC::JSCallbackFunction>(JSC::JSGlobalObject*, JSC::CallFrame*)
    Frameworks/JavaScriptCore.framework/JavaScriptCore _llint_entry
    Frameworks/JavaScriptCore.framework/JavaScriptCore _llint_entry
    Frameworks/JavaScriptCore.framework/JavaScriptCore _llint_entry
    Frameworks/JavaScriptCore.framework/JavaScriptCore _llint_entry
    Frameworks/JavaScriptCore.framework/JavaScriptCore _llint_entry
    Frameworks/JavaScriptCore.framework/JavaScriptCore _llint_entry
    Frameworks/JavaScriptCore.framework/JavaScriptCore _llint_entry
    Frameworks/JavaScriptCore.framework/JavaScriptCore _llint_entry
    Frameworks/JavaScriptCore.framework/JavaScriptCore _vmEntryToJavaScript
    Frameworks/JavaScriptCore.framework/JavaScriptCore JSC::Interpreter::executeCall(JSC::JSGlobalObject*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&)
    Frameworks/JavaScriptCore.framework/JavaScriptCore JSC::boundThisNoArgsFunctionCall(JSC::JSGlobalObject*, JSC::CallFrame*)
    Frameworks/JavaScriptCore.framework/JavaScriptCore _vmEntryToNative
    Frameworks/JavaScriptCore.framework/JavaScriptCore JSC::Interpreter::executeCall(JSC::JSGlobalObject*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&)
    Frameworks/JavaScriptCore.framework/JavaScriptCore JSC::profiledCall(JSC::JSGlobalObject*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&)
    Frameworks/JavaScriptCore.framework/JavaScriptCore _JSObjectCallAsFunction
    Tenant Move-In facebook::react::JSIExecutor::defaultTimeoutInvoker(std::__1::function<void ()> const&, std::__1::function<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > ()>)
    Tenant Move-In facebook::react::JSIExecutor::defaultTimeoutInvoker(std::__1::function<void ()> const&, std::__1::function<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > ()>)
    Tenant Move-In facebook::react::JSIExecutor::defaultTimeoutInvoker(std::__1::function<void ()> const&, std::__1::function<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > ()>)
    Tenant Move-In facebook::react::JSIExecutor::defaultTimeoutInvoker(std::__1::function<void ()> const&, std::__1::function<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > ()>)
    Tenant Move-In facebook::react::JSIExecutor::defaultTimeoutInvoker(std::__1::function<void ()> const&, std::__1::function<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > ()>)
    Tenant Move-In facebook::react::JSIExecutor::defaultTimeoutInvoker(std::__1::function<void ()> const&, std::__1::function<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > ()>)
    Tenant Move-In facebook::react::JSIExecutor::defaultTimeoutInvoker(std::__1::function<void ()> const&, std::__1::function<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > ()>)
    Tenant Move-In facebook::react::JSIExecutor::defaultTimeoutInvoker(std::__1::function<void ()> const&, std::__1::function<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > ()>)
    Frameworks/CoreFoundation.framework/CoreFoundation ___CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__
    Frameworks/CoreFoundation.framework/CoreFoundation ___CFRunLoopDoBlocks
    Frameworks/CoreFoundation.framework/CoreFoundation ___CFRunLoopRun
    Frameworks/CoreFoundation.framework/CoreFoundation _CFRunLoopRunSpecific
    Tenant Move-In facebook::react::JSIExecutor::defaultTimeoutInvoker(std::__1::function<void ()> const&, std::__1::function<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > ()>)
    Frameworks/Foundation.framework/Foundation ___NSThread__start__
    /usr/lib/system/libsystem_pthread.dylib __pthread_start

      While I understand this is probably extremely hard to debug/reproduce in a controlled environment, it would be great for Realm to attempt to handle null pointer exceptions in a way that won't crash the whole app, but rather cause a query error or something. This is probably one out of 10 different realm-related native crashes that are reported daily from our crash reporting tool.

      Similar crashes:
      https://github.com/realm/realm-js/issues/3111
      https://github.com/realm/realm-js/issues/2853
      https://github.com/realm/realm-js/issues/2828
      https://github.com/realm/realm-js/issues/2713

      Steps to Reproduce

      <!--- What are steps we can follow to reproduce this issue? -->
      Regular realm usage without any sync/online features.

      Code Sample

      Regular offline use, no special code required.
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      Version of Realm and Tooling

      • Realm JS SDK Version: ? 6.0.3
      • Node or React Native: ? React Native 0.61.5
      • Client OS & Version: ? iOS 13.6 / iPhone 8
      • Which debugger for React Native: None - production build

            Assignee:
            Unassigned Unassigned
            Reporter:
            unitosyncbot Unito Sync Bot
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            Watchers:
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              Created:
              Updated:
              Resolved: