harmony 鸿蒙Startup

2022-08-09
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Startup

System Startup

Device Startup Interrupted Due to “parse failed!” Error

Symptom

During device startup, the error message “[Init] InitReadCfg, parse failed! please check file /etc/init.cfg format.” is displayed, and the startup is interrupted, as shown in the following figure.

Figure 1 Error information

en-us_image_0000001200053087

Possible Cause

The content of the init.cfg file does not comply with the JSON specifications.

Solution

Check the init.cfg file and ensure that its format meets the JSON specifications.

Device Restarted Repeatedly

Symptom

The device restarts over and over again upon startup.

Possible Cause

Each service started by the init process has the importance attribute, as described in Parameters.

If the attribute value is 0, the init process does not need to restart the device when the current service process exits.
If the attribute value is 1, the init process needs to restart the device when the current service process exits.

Solution

View logs to identify the service that encounters a process crash or exits due to an error, rectify the issue, and then burn the image again.
Change the value of importance to 0 for the service that exits due to a process crash or an error, and then burn the image again.

SetParameter or GetParameter Failed with Correct Parameters Passed

Symptom

Calling SetParameter or GetParameter fails when correct parameters are passed.

System Type

liteos-a

Possible Cause

Permission verification has been enabled for SetParameter and GetParameter. If the UID of the caller is greater than 1000, that is, the caller does not have the API call permission, calling an API will fail even if correct parameters are passed.

Solution

No action is required.

ueventd Service Failed to Obtain a Socket upon Startup

Symptom

After the ueventd service is started, the error message “Failed to get uevent socket, try to create” is displayed, and the error information as shown in the following figure is logged.

Figure 2 Failure to obtain a socket

ueventd_socket

Possible Cause

The ueventd service is started on demand. Upon startup, it first needs to check the environment variables for fd of the socket created by the init process. The preceding error information will be displayed if the ueventd service fails to obtain environment variables. The possible causes are as follows: 1. No socket has been configured for the ueventd service in the .cfg file. As a result, the init process does not create a socket for the ueventd service, and no socket ID is present in environment variables. 2. If a socket has been configured for the ueventd service in the .cfg file, it is probable that the ueventd service is also configured in another .cfg file but no socket is designated for it.

Solution

For case 1, configure a socket for the ueventd service in the .cfg file. For details, see Socket Configuration for the ueventd Service.
For case 2, check all .cfg files for any duplicate ueventd service and delete it. Retain only one ueventd service with valid configuration.

ueventd Service Exits Because of a Socket Polling Timeout

Symptom

After the ueventd service is started for a period of time, the error message “poll ueventd socket timeout, ueventd exit” is displayed and the ueventd service automatically exits.

Possible Cause

The ueventd service is started on demand. When a uevent is reported, the init process receives a socket message and starts the ueventd service to process the message. After processing the message, the ueventd service polls the corresponding socket handle for 30s. If a new socket message is reported within this period of time, the ueventd service continues to process the message. After processing the message, the ueventd service polls the socket handle for 30s once again. If no new socket message is reported within this period of time, the ueventd service exits and returns the socket to the init process for polling. In this case, the preceding error message is displayed.

Solution

This is a normal phenomenon and no action is required.

Service with the ondemand Attribute Failed to Start Because of a Configuration Parsing Error

Symptom

The service configuration in JSON format cannot be correctly parsed, and the error message “Service is invalid which has both critical and ondemand attribute” is displayed. When the service is started, the error message “Cannot find service” is displayed.

Possible Cause

When the ondemand attribute is configured, a service is started on demand by default. This attribute, however, is mutually exclusive with the critical attribute. If both of them are configured, a conflict will occur, resulting in a failure to resolve the service.

Solution

If a service does not need to be started on demand, leave the ondemand attribute unspecified.
If a service needs to be started on demand, leave the critical attribute unspecified or disable the critical attribute after you configure the ondemand attribute.

Parallel Startup Is Not Effective for Services Configured with the ondemand Attribute

Symptom

Services configured with the ondemand attribute are not started in the parallel startup phase, regardless of the start-mode settings.

Possible Cause

Services configured with the ondemand attribute are started only when the startup conditions are met. Therefore, parallel startup is not effective for these services.

Solution

If you want to add a service to parallel startup, do not configure the ondemand attribute for it.

SA Services Cannot Be Started on Demand

Symptom

When an SA service is configured with the ondemand attribute, the samgr process does not start the SA service after the SA client sends a request.

Possible Cause

At the initial implementation of on-demand startup for SA services, SystemAbilityManager::CheckSystemAbility(int32_t systemAbilityId) is used for all SA services. To distinguish SA services that are started on demand, LoadSystemAbility(int32_t systemAbilityId, const sptr& callback) provided by the samgr process is added. If an SA service is not started on demand, it is probable that the original API is used by mistake.

Solution

Use LoadSystemAbility(int32_t systemAbilityId, const sptr& callback) for any SA service that needs to be started on demand.

Improper caps Configuration

Symptom

Improper caps configuration leads to a configuration error. The error information is as follows:

4.619955] [pid=1 0][Init][ERROR][init_capability.c:119]service=multimodalinput not support caps = CAP_DC_OVERRIDE caps 41
[ 4.620014] [pid=1 0][Init][ERROR][init_service_manager.c:818]GetServiceSecon secon section not found, skip
[ 4.620216] [pid=1 0][Init][ERROR][init_service_manager.c:818]GetServiceSecon secon section not found, skip
[ 4.620608] [pid=1 0][Init][ERROR][init_capability.c:119]service=mmi_uinput_service  not support caps = CAP_DC_OVERRIDE caps 41

Possible Cause

The caps configuration is not supported by the kernel.
The configuration in the .cfg file is incorrect.

System Version

OpenHarmony-3.0-LTS

Solution

For case 1, leave caps unspecified.
For case 2, correctly configure caps by referring to the definition of the capStrCapNum data structure in base/startup/init/services/init/init_capability.c.

Sandbox Not Enabled

Symptom

After hdc shell param get const.sandbox is run, it is found that the value of const.sandbox is not enable.

Possible Cause

None.

Solution

Set const.sandbox to enable in base/startup/init/services/etc/param/ohos.para. For details, see Sandbox Management.

How to Check the Sandbox Mounting Status

Symptom

None.

Possible Cause

None.

Solution

Enter the hdc shell mode on the device. Then, run the sandbox -s service_name command to move the current service to the sandbox, and run shell commands such as ls to view the sandbox directory. For details, see the sandbox command description.

Timestamp in the Ready Phase of Some Bootevent Events Is 0

Symptom

In manual bootevent mode, after device startup is completed and the dump_service all bootevent command is executed, the timestamps in the ready phase of some events are 0.

Possible Cause

The service does not send the bootevent event.
The service sends the bootevent event, but does not have the related permission.

Solution

For case 1, make sure the related service sends the bootevent in the code.
For case 2, make sure the service has the permission to set the bootevent parameter.

Failed to Boot from Partition A/B

Symptom

After the image is burnt, the system cannot be started, and information similar to the following can be found in the serial port log:

wait for file:/dev/block/platform/fe310000.sdhci/by-name/system_b failed after 5 second.
Mount /dev/block/platform/fe310000.sdhci/by-name/system_b to /usr failed 2

Possible Cause

As indicated by the log, partition B is used as the boot partition. However, it is not found during startup, resulting in the startup failure. This issue occurs because the active slot value in the misc partition is set to 2 (partition B), but partition B is not burnt.

Solution

Clear the misc partition by burning the corresponding partition with an empty misc image, erase the active slot value, and restart the system from the default partition.
Burn the system_b and vendor_b images to the development board by using the partition table configured with partition B. Then, the development board can boot from partition B.

Application Spawning

Failed to Start appspawn

Symptom

During system startup, the system stops at the startup animation and fails to launch the appspawn process.

Possible Cause

The startup animation does not exit properly.
The attempt to start system applications has failed, resulting in a failure to start the appspawn process.

Solution

View logs to identify the service that encounters a process crash or exits due to an error, rectify the issue, and then burn the image again.

Cold Start of Applications Failed

Symptom

Applications fail to be started by running the cold start command.

  aa start -d 12345 -a $name -b $package -C

Possible Cause

Cold start is not enabled.
The parameter of the cold start command is incorrect.
The socket request times out.
SELinux is enabled.

Solution

For case 1, run param get startup.appspawn.cold.boot to check the cold start switch and run param set startup.appspawn.cold.boot 1 to enable cold start.
For case 2, correct the parameter of the cold start command.
For case 3, run the param set persist.appspawn.client.timeout 5 command to set the timeout period to 5.
For case 4, run the setenforce 0 command to disable SELinux.

Failed to Create the Application Sandbox

Symptom

The system UI freezes at the OpenHarmony startup animation, the calculator application does not respond after being touched, or the font is not displayed properly. The error information in the hilog file is as follows: - bind mount <src-path> to <sandbox-path> failed errno <errorCode> - private mount to <sandbox-path> failed errno <errorCode> - symlink failed, <link-name>, errno is <errorCode>

Possible Cause

The sandbox creation process is incorrect.
The com.ohos.systemui sandbox fails to be created.
The file on which the application sandbox depends is not configured correctly.

Solution

Check the error information in the hilog file, and correct the corresponding JSON files.
Verify the PID of the application, the code logic of the sandbox creation process, and the JSON configuration.

For details, see How to Develop in Application Sandbox Development Procedure.