NDKSignalTest

• Shows a crash on Android 4.2+ devices (mostly Nexus devices tested)

• This may be interesting to Android developers working on libc (bionic) and/or Linux kernel

Build a reduced testcase as a standard Android app

• Edit local.properties to specify path to Android NDK/SDK so you can build this

• With a USB cable attached to an Android device do ./run.sh from the toplevel directory ... it will compile, load, and launch the app on the device

Watch logcat

• Watch the adb logcat for crash (see list of devices known to crash below)

To build a super-reduced ADB commandline testcase

YMMV...

• Edit the jni/Android.mk file to comment the include $(BUILD_SHARED_LIBRARY) line and uncomment the include $(BUILD_EXECUTABLE) line

• Edit the jni/NDKSignalTest.c file to enable the main() codepath ... you may also need to increate the number of native worker threads

• Execute ndk-build in the jni directory

• Copy the resulting exe using ADB to an executable directory device, e.g. for a Nexus 7 running Android 4.2+ : adb push ../libs/armeabi/NDKSignalTest /data/local/tmp/

• Possibly you may need to add executable permissions : adb shell chmod 755 /data/local/tmp/NDKSignalTest

• Execute over adb : adb shell /data/local/tmp/NDKSignalTest

Crashing Devices

Serial number is reported by adb devices

• Nexus 5 running 4.4.4 ... Kernel 3.4.0-gd59db4e [email protected] #1 Mon Mar 17 15:16:36 PDT 2014 (serial # 05efecfcf0db3246)

• Nexus 5 running 5.0 ... Kernel 3.4.0-g323bbd9 [email protected] (gcc version 4.7 (GCC) ) #1 SMP PREEMPT Thu Oct 9 05:57:15 UTC 2014 (serial #03758e42437e9654)

• Nexus 4 running 4.2.2 ... Kernel 3.4.0-perf-g7ce11cd [email protected] #1 Tue Jan 29 11:41:33 PST 2013 (serial # 04c79daee4d3951f)

Apparently Immune Devices

• Nexus 7 running 4.2.2 ... Kernel 3.1.10-g05b777c [email protected] #1 Thu Nov 29 10:35:37 PST 2012 (serial # 015d1244cd5bf40c)

• Nexus 7 running 4.3 ... Kernel 3.1.10-g1e8b3d8 [email protected] #1 Tue Jun 11 23:51:41 PDT 2013 (serial # 015d2109ab1ffc03)

• Nexus 7 running 4.4.4 ... Kernel 3.1.10-g1e42d16 [email protected] #1 Thu Mar 13 11:33:27 PDT 2014 (serial # 015d2d42235c0808)

• Samsung GT4 10" running 4.4.2 ... Kernel 3.4.0-1105486 dpi@SWDD5006 #1 Sat Mar 29 11:06:39 KST 2014 (serial # 51d5881002d21796)

• Nexus 10 running 4.2.2 ... Kernel 3.4.5-gaf9c307 [email protected] #1 Tue Jan 8 17:22:07 PST 2013 (serial # R32CA04LS1D)

• Nexus 10 running 4.4.2 ... Kernel 3.4.39-g5b5c8df [email protected] #1 Wed Nov 20 15:12:05 PST 2013 (serial # R32CB017DRT)