Transform animation with BackdropFilter is causing a crash (null pointer dereference) #95211
Description
I was looking for the culprit for a few days, but with the absence of readable logs I had to check every pieces on my code.
I finally found it: Transform with perspective and backdrop filter don't go well together
Steps to Reproduce
- Execute
flutter runon the code sample - Tap on the red container to trigger the animation
- The app should crash
Expected results:
It was working fine a few months ago, but now it crashes on the Android emulator as well as on my Samsung Note 9
I'm debugging the app on W10
Code sample
class TestScreen extends StatefulWidget {
TestScreen({Key? key}) : super(key: key);
@override
_TestScreenState createState() => _TestScreenState();
}
class _TestScreenState extends State<TestScreen>
with SingleTickerProviderStateMixin {
late AnimationController handler;
late var rotation;
@override
void initState() {
super.initState();
handler =
AnimationController(vsync: this, duration: Duration(milliseconds: 140));
rotation = Tween(begin: 0, end: pi / 2)
.animate(CurvedAnimation(parent: handler, curve: Curves.decelerate));
}
@override
void dispose() {
handler.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Center(
child: Container(
child: AnimatedBuilder(
animation: handler,
builder: (context, child) {
return Transform(
transform: Matrix4.identity()
..setEntry(3, 2, 0.001)
..rotateY(1.0 * rotation.value),
alignment: Alignment.center,
child: BackdropFilter(
filter: ImageFilter.blur(sigmaX: 1.0, sigmaY: 1.0),
child: GestureDetector(
onTap: () => handler.forward(),
child:
Container(height: 40, width: 200, color: Colors.red)),
),
);
},
),
),
);
}
}Logs
F/libc (32300): Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x2c in tid 32361 (1.raster), pid 32300 (example.app)
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
Build fingerprint: 'google/sdk_gphone_x86_arm/generic_x86_arm:11/RSR1.201013.001/6903271:userdebug/dev-keys'
Revision: '0'
ABI: 'x86'
Timestamp: 2021-12-13 20:09:04+0000
pid: 32300, tid: 32361, name: 1.raster >>> com.example.app <<<
uid: 10170
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x2c
Cause: null pointer dereference
eax c3976b01 ebx c58e054c ecx c58e054c edx 00000015
edi 00000000 esi c3976c20
ebp c3976be8 esp c3976b00 eip c50fab14
backtrace:
#00 pc 01574b14 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#25 pc 01830074 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#26 pc 0181f4ab /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#27 pc 0181f998 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#28 pc 01840916 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#29 pc 0183f1dd /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#30 pc 0183fea9 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#31 pc 018413a0 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#32 pc 01437be5 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#33 pc 0183f6bd /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#34 pc 0183f3b5 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#35 pc 01850124 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#36 pc 014315a9 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#37 pc 014356cd /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/ccom.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#38 pc 014355de /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#39 pc 0143d9ec /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#40 pc 0143da1a /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#41 pc 00019337 /system/lib/libutils.so (android::SimpleLooperCallback::handleEvent(int, int, void*)+39) (BuildId: ab4be013cda31e8c45d48aa23a89d0f8)
#42 pc 0001a367 /system/lib/libutils.so (android::Looper::pollInner(int)+1127) (BuildId: ab4be013cda31e8c45d48aa23a89d0f8)
#43 pc 00019e96 /system/lib/libutils.so (android::Looper::pollOnce(int, int*, int*, void**)+118) (BuildId: ab4be013cda31e8c45d48aa23a89d0f8)
#44 pc 000133f5 /system/lib/libandroid.so (ALooper_pollOnce+101) (BuildId: f98006d4d736575082b552ff24b66f6c)
#45 pc 0143d92f /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#46 pc 0143558c /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#47 pc 014350b4 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#48 pc 0143a7d7 /data/app/~~SFBGw7wmUz22XEPc2KQi6Q==/com.example.app-1qQaZRxISvjXwsFMEQURbw==/lib/x86/libflutter.so (BuildId: 442f36a8362548d1b15ca165b3a08e7fe298ee75)
#49 pc 000e6974 /apex/com.android.runtime/lib/bionic/libc.so (__pthread_start(void*)+100) (BuildId: 6e3a0180fa6637b68c0d181c343e6806)
#50 pc 00078567 /apex/com.android.runtime/lib/bionic/libc.so (__start_thread+71) (BuildId: 6e3a0180fa6637b68c0d181c343e6806)
Lost connection to device.
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