Not Able to launch Jenkins URL

Hello,

Its regarding one of critical issue were facing with our jenkins setup.

Jenkins was working fine for us, but now we are not able to launch Jenkins and get below error:

//

022-01-10 05:07:45.190+0000 [id=181] WARNING hudson.util.AtomicFileWriter#commit: Unable to move atomically, falling back to non-atomic move.022-01-10 05:07:45.190+0000 [id=181] WARNING hudson.util.AtomicFileWriter#commit: Unable to move atomically, falling back to non-atomic move.java.nio.file.FileSystemException: /var/lib/jenkins/atomic14165495275973653575tmp → /var/lib/jenkins/config.xml: Operation not permitted at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:100) at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111) at java.base/sun.nio.fs.UnixCopyFile.move(UnixCopyFile.java:417) at java.base/sun.nio.fs.UnixFileSystemProvider.move(UnixFileSystemProvider.java:267) at java.base/java.nio.file.Files.move(Files.java:1422) at hudson.util.AtomicFileWriter.commit(AtomicFileWriter.java:191) at hudson.XmlFile.write(XmlFile.java:200) at jenkins.model.Jenkins.save(Jenkins.java:3381) at jenkins.model.Jenkins.saveQuietly(Jenkins.java:3387) at jenkins.model.Jenkins.setSecurityRealm(Jenkins.java:2639) at jenkins.model.Jenkins$16.run(Jenkins.java:3331) at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169) at

org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:296) at jenkins.model.Jenkins$5.runTask(Jenkins.java:1131) at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:214) at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117) at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)

We tried below actions:

We tried to modify config.xml with sudo user but operation is not permitted, neither we are able to rename nor able to delete it.
change the ownership of config.xml to root using chown command , still same issue coming.
Attached logs shown on URL as screenshot ( File: URLlogs)
Attached Jenkins logs from /var/log/jenkins/ ( File: Jenkinslogs)

This has totally blocked our devops activities. Any suggestions and inputs are highly appreciated.

Thanks
Avinash