Clone this project then run with release build on any Android device.
$ flutter run --relase
Open the FlutterActivity, then pop, you will see this crash.
2020-01-17 11:04:57.294 6517-6558/? A/libc: Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x50 in tid 6558 (Thread-4), pid 6517 (y_cached_engine)
2020-01-17 11:04:57.355 6847-6847/? A/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
2020-01-17 11:04:57.355 6847-6847/? A/DEBUG: Build fingerprint: 'HUAWEI/VOG-AL10/HWVOG:10/HUAWEIVOG-AL10/10.0.0.185C00:user/release-keys'
2020-01-17 11:04:57.355 6847-6847/? A/DEBUG: Revision: '0'
2020-01-17 11:04:57.355 6847-6847/? A/DEBUG: ABI: 'arm64'
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: SYSVMTYPE: Maple
APPVMTYPE: Art
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: Timestamp: 2020-01-17 11:04:57+0800
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: pid: 6517, tid: 6558, name: Thread-4 >>> com.example.test_destroy_cached_engine <<<
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: uid: 10301
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x50
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: Cause: null pointer dereference
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: x0 000000760e30e300 x1 000000769e3a1c54 x2 000000760a001870 x3 0000000000000000
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: x4 00000000000001fe x5 0000000000000008 x6 00000076a16c1000 x7 000000000fe7392a
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: x8 0000000000000000 x9 0000000000000001 x10 0000000000000001 x11 0000000000000000
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: x12 0000000000000000 x13 ffffffffffffffb0 x14 0004536d08d5706d x15 00000e62f68aa13d
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: x16 00000075aec63368 x17 000000769e3a2950 x18 00000075ad7e8000 x19 000000760e30e300
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: x20 000000760e30e300 x21 000000760e2a61c0 x22 00000076120170f0 x23 0000000000000001
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: x24 0000007603cc3050 x25 000000760e3ee8f0 x26 000000760e3ee920 x27 00000075aec71000
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: x28 0000007603cc3000 x29 000000760a001bb0
2020-01-17 11:04:57.356 6847-6847/? A/DEBUG: sp 000000760a001400 lr 00000075aeaef6f0 pc 00000075aea7a6e0
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: backtrace:
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #00 pc 000000000062d6e0 /data/app/com.example.test_destroy_cached_engine-sNLyQ2_mykz3sR3cA6MKqQ==/lib/arm64/libflutter.so!libflutter.so (offset 0x270000) (BuildId: 741afda8f9ff0f9c)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #01 pc 00000000006a26ec /data/app/com.example.test_destroy_cached_engine-sNLyQ2_mykz3sR3cA6MKqQ==/lib/arm64/libflutter.so!libflutter.so (offset 0x270000) (BuildId: 741afda8f9ff0f9c)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #02 pc 00000000004c66f4 /data/app/com.example.test_destroy_cached_engine-sNLyQ2_mykz3sR3cA6MKqQ==/lib/arm64/libflutter.so!libflutter.so (offset 0x270000) (BuildId: 741afda8f9ff0f9c)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #03 pc 0000000000290000 /data/app/com.example.test_destroy_cached_engine-sNLyQ2_mykz3sR3cA6MKqQ==/lib/arm64/libflutter.so!libflutter.so (offset 0x270000) (BuildId: 741afda8f9ff0f9c)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #04 pc 00000000002926ec /data/app/com.example.test_destroy_cached_engine-sNLyQ2_mykz3sR3cA6MKqQ==/lib/arm64/libflutter.so!libflutter.so (offset 0x270000) (BuildId: 741afda8f9ff0f9c)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #05 pc 0000000000017d8c /system/lib64/libutils.so (android::Looper::pollInner(int)+856) (BuildId: 868b138f3e4abfebd8910c8133e83b50)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #06 pc 0000000000017994 /system/lib64/libutils.so (android::Looper::pollOnce(int, int*, int*, void**)+56) (BuildId: 868b138f3e4abfebd8910c8133e83b50)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #07 pc 0000000000013684 /system/lib64/libandroid.so (ALooper_pollOnce+96) (BuildId: d98cd12b5c84aaf027fff709255998e4)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #08 pc 0000000000292808 /data/app/com.example.test_destroy_cached_engine-sNLyQ2_mykz3sR3cA6MKqQ==/lib/arm64/libflutter.so!libflutter.so (offset 0x270000) (BuildId: 741afda8f9ff0f9c)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #09 pc 000000000028f1d8 /data/app/com.example.test_destroy_cached_engine-sNLyQ2_mykz3sR3cA6MKqQ==/lib/arm64/libflutter.so!libflutter.so (offset 0x270000) (BuildId: 741afda8f9ff0f9c)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #10 pc 0000000000291290 /data/app/com.example.test_destroy_cached_engine-sNLyQ2_mykz3sR3cA6MKqQ==/lib/arm64/libflutter.so!libflutter.so (offset 0x270000) (BuildId: 741afda8f9ff0f9c)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #11 pc 00000000000ce190 /apex/com.android.runtime/lib64/bionic/libc.so (__pthread_start(void*)+36) (BuildId: 2f04208be3c24ae761428c0bcfa6bcdf)
2020-01-17 11:04:57.358 6847-6847/? A/DEBUG: #12 pc 0000000000070ba8 /apex/com.android.runtime/lib64/bionic/libc.so (__start_thread+64) (BuildId: 2f04208be3c24ae761428c0bcfa6bcdf)