"L2ALM: msg2master without IPC pipe/thread" log seen in 'messages', flooding the 'messages' file.

The L2ALM thread in the PFE attempts to make a connection to the Layer 2 Address Learning Daemon (L2ALD) on the
Routing Engine.

Please keep in mind that this thread is not used until Layer 2 (Transparent) mode is configured.

If the SRX device is configured with Layer 3 mode, this message is harmless. However, it could be an issue if this happens in an SRX configured with Layer 2 (Transparent) mode. In such cases, further investigation with JTAC is recommended.

To address the flooding of this log message, you can restart the L2-L process using the command:

root@srx> restart l2-learning

If restarting the process does not stop the logs and your device is a chassis cluster, you can also failover on both RG0 and RG1+.

If that also does not stop the logs from showing up, rebooting the box may be necessary.