Display of components with PanGestureHandler crashes on Android

Description

When I display a list of items containing PanGestureHandler, my app crashes most of the time on android (I don’t have the issue on iOS)

Screenshots

Steps To Reproduce

Display a list of items with this component : https://gist.github.com/mlecoq/6974dce3a48559ce8b164f2185d4d074

Expected behavior

Items are displayed and I can drag them

Actual behavior

The app crashes

Snack or minimal code example

https://gist.github.com/mlecoq/6974dce3a48559ce8b164f2185d4d074

Package versions

• React: 16.14.0
• React Native: 0.63.4
• React Native Reanimated: 2.0.0-rc.1
• NodeJS: 14.5.0

Here is the stacktrace obtained with Sentry:

OS Version: Android 10 (QP1A.190711.020.T720XXU1CTI1)
Report Version: 104

Exception Type: Unknown (SIGABRT)

Application Specific Information:
Abort

Thread 0 Crashed:
0   libc.so                         0x743b1f22a8        abort
1   libfbjni.so                     0x73487c0694        _Unwind_SetGR
2   libfbjni.so                     0x73487bd554        __gxx_personality_v0
3   libhermes.so                    0x733bdb9010        <unknown> + 494925484048
4   libhermes.so                    0x733bdb9518        _Unwind_Resume
5   libhermes.so                    0x733bb7cec4        facebook::hermes::HermesRuntimeImpl::callAsConstructor
6   libreanimated.so                0x7335331788        <unknown> + 494813779848
7   libhermes.so                    0x733bb83b74        facebook::hermes::HermesRuntimeImpl::HFContext::func
8   libhermes.so                    0x733bba30ec        <unknown> + 494923297004
9   libhermes.so                    0x733bba6bbc        <unknown> + 494923312060
10  libhermes.so                    0x733bba43a0        <unknown> + 494923301792
11  libhermes.so                    0x733bb7cd1c        facebook::hermes::HermesRuntimeImpl::call
12  libreanimated.so                0x7335331788        <unknown> + 494813779848
13  libhermes.so                    0x733bb83b74        facebook::hermes::HermesRuntimeImpl::HFContext::func
14  libhermes.so                    0x733bba30ec        <unknown> + 494923297004
15  libhermes.so                    0x733bba6bbc        <unknown> + 494923312060
16  libhermes.so                    0x733bba43a0        <unknown> + 494923301792
17  libhermes.so                    0x733bb7cd1c        facebook::hermes::HermesRuntimeImpl::call
18  libreanimated.so                0x7335331724        <unknown> + 494813779748
19  libhermes.so                    0x733bb83b74        facebook::hermes::HermesRuntimeImpl::HFContext::func
20  libhermes.so                    0x733bb9163c        <unknown> + 494923224636
21  libhermes.so                    0x733bb7cd1c        facebook::hermes::HermesRuntimeImpl::call
22  libreanimated.so                0x733533498c        reanimated::Mapper::execute
23  libreanimated.so                0x7335320dc8        reanimated::MapperRegistry::execute
24  libreanimated.so                0x733531a974        reanimated::NativeReanimatedModule::onRender
25  libreanimated.so                0x7335315b74        facebook::jni::detail::MethodWrapper<T>::dispatch
26  libreanimated.so                0x7335315acc        _ZN8facebook3jni6detail15FunctionWrapperIPFvNS0_9alias_refIPNS1_8JTypeForINS0_11HybridClassIN10reanimated22AnimationFrameCallbackENS1_15BaseHybridClassEE8JavaPartENS0_7JObjectEvE11_javaobjectEEEOdEXadL_ZNS1_13MethodWrapperIMS7_FvdEXadL_ZNS7_16onAnimatio...
27  libart.so                       0x73b8146354        <unknown> + 497009582932
28  <unknown>                       0x9c166cc0          <unknown>

[piaskowyk]

There are two problems:

• You use measure() function on the uninitialized object here. indicatorRef can be undefined at this moment because the <Indicator> object can be uninitialized yet during you try to run measure.

• We caught exceptions in the wrong way and you weren’t able to catch this exception and the application crashed.

Thanks for the well-described issue and for preparing the playground repo - it was helpful 👏

[mlecoq]

@piaskowyk I still reproduce it : https://streamable.com/0mx2sl