Facing this problem while trying to implement JaCoCo Offline Instrumentation.

```
W/System.err( 1733): java.io.FileNotFoundException: /jacoco.exec: open failed: EROFS (Read-only file system)
W/System.err( 1733):    at libcore.io.IoBridge.open(IoBridge.java:456)
W/System.err( 1733):    at java.io.FileOutputStream.<init>(FileOutputStream.java:89)
--
W/System.err( 1733):    at libcore.io.IoBridge.open(IoBridge.java:456)
W/System.err( 1733):    at java.io.FileOutputStream.<init>(FileOutputStream.java:89)
W/System.err( 1733):    at org.jacoco.agent.rt.internal_14f7ee5.output.FileOutput.openFile(FileOutput.java:67)
W/System.err( 1733):    at org.jacoco.agent.rt.internal_14f7ee5.output.FileOutput.startup(FileOutput.java:49)
W/System.err( 1733):    at org.jacoco.agent.rt.internal_14f7ee5.Agent.startup(Agent.java:122)
W/System.err( 1733):    at org.jacoco.agent.rt.internal_14f7ee5.Agent.getInstance(Agent.java:50)
W/System.err( 1733):    at org.jacoco.agent.rt.internal_14f7ee5.Offline.<clinit>(Offline.java:31)

```