robot controller6.2 crash in android 10

[steveliu168]

when I try to use Driver Station to connect robot controller,RC crash every time. My android version is 10 ,and I try android 9,it has the same issue. But it works perfect in android 8.1.
I notice that the logs has tow orange information: libc :Access denied finding property "ro.serialno"

[Windwoes]

This is currently a known issue. As no competition legal devices currently run Android 10, fixing this has not been high on the priority list, but it will be investigated at some point.

[pennygao]

I experience RobotController 6.2 crash on Android 10, too, also as soon as Driver Station connected to Robot Controller. But I don't see "libc :Access denied finding property "ro.serialno" in logs, instead, my crash backtrace is like below:

04-16 18:55:52.641 15797 15797 F DEBUG : signal 31 (SIGSYS), code -6 (SI_TKILL), fault addr --------

04-16 18:55:53.025 15797 15797 F DEBUG : backtrace:
04-16 18:55:53.025 15797 15797 F DEBUG : #00 pc 00000000000cea28 /apex/com.android.runtime/lib64/bionic/libc.so (settimeofday+8) (BuildId: 4cd97724e0ae0bf213b33eacb7bfbbe8)
04-16 18:55:53.026 15797 15797 F DEBUG : #1 pc 0000000000021eb4 /data/app/com.qualcomm.ftcrobotcontroller-G5ASKIaCF3aKTBC4z9uJcg==/lib/arm64/libRobotCore.so (Java_org_firstinspires_ftc_robotcore_internal_system_AppUtil_nativeSetCurrentTimeMillis+156) (BuildId: 6b9c6ad4e62aa663f15cf9cefbfcd8cbce597f33)
04-16 18:55:53.026 15797 15797 F DEBUG : #2 pc 000000000002f374 /data/app/com.qualcomm.ftcrobotcontroller-G5ASKIaCF3aKTBC4z9uJcg==/oat/arm64/base.odex (art_jni_trampoline+132)
04-16 18:55:53.026 15797 15797 F DEBUG : #3 pc 0000000000137334 /apex/com.android.runtime/lib64/libart.so (art_quick_invoke_stub+548) (BuildId: e1ef08b5ba2ec71adc5b7c8230ae4048)
04-16 18:55:53.026 15797 15797 F DEBUG : #4 pc 000000000014606c /apex/com.android.runtime/lib64/libart.so (art::ArtMethod::Invoke(art::Thread*, unsigned int*, unsigned int, art::JValue*, char const*)+244) (BuildId: e1ef08b5ba2ec71adc5b7c8230ae4048)

With some google search it seems settimeofday() requires root privilege and probably this is why the app get killed. Is this the same problem as reported above, or a different one?

(Complete log collected through "adb logcat" and AndroidStudio attached.

log_from_adb_logcat.log
log_from_AndroidStudio.log

[NoahAndrews]

Good sleuthing! We already figured out that was the issue, and have it fixed for the next release.

[Windwoes]

With some google search it seems settimeofday() requires root privilege and probably this is why the app get killed. Is this the same problem as reported above, or a different one?

Yes, this is indeed the issue. The Control Hub has a custom kernel to allow the system call, and unmodified Android versions before Pie will simply silently fail when making the call. However, newer versions will cause a native crash if an app tries to invoke that system call.

This will be fixed in the next release of the SDK.

[Windwoes]

Fixed in 7.0