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Commit dcec1930 authored by Tom Cherry's avatar Tom Cherry Committed by android-build-merger
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Merge "init: add tips for debugging linker errors when launching init services" 

am: 3699dbe2

Change-Id: Id036e137c0a067e09c3f3b7e329b64bb0d6aa826
parents 9084a131 3699dbe2

init/README.md

+6 −0
Original line number Diff line number Diff line
@@ -784,6 +784,12 @@ affected. 


Debugging init

--------------

When a service starts from init, it may fail to `execv()` the service. This is not typical, and may

point to an error happening in the linker as the new service is started. The linker in Android

prints its logs to `logd` and `stderr`, so they are visible in `logcat`. If the error is encountered

before it is possible to access `logcat`, the `stdio_to_kmsg` service option may be used to direct

the logs that the linker prints to `stderr` to `kmsg`, where they can be read via a serial port.



Launching init services without init is not recommended as init sets up a significant amount of

environment (user, groups, security label, capabilities, etc) that is hard to replicate manually.

init/service.cpp

+2 −1
Original line number Diff line number Diff line
@@ -490,7 +490,8 @@ Result<void> Service::Start() { 
        SetProcessAttributesAndCaps();



        if (!ExpandArgsAndExecv(args_, sigstop_)) {

            PLOG(ERROR) << "cannot execve('" << args_[0] << "')";

            PLOG(ERROR) << "cannot execv('" << args_[0]

                        << "'). See the 'Debugging init' section of init's README.md for tips";

        }



        _exit(127);