This article explains an issue where srxpfe crashes when RE CPU is running on 100% utilisation.

When RE CPU is running with 0% idle, srxpfe may crash and generate a core dump, as shown below:

User@srx> show chassis routing-engine no-forwarding
Routing Engine status:
 Temperature    36 degrees C / 96 degrees F
 CPU temperature   36 degrees C / 96 degrees F
 Total memory    1898 MB Max 380 MB used ( 20 percent)
 Memory utilization   20 percent
 5 sec CPU utilization:
  User      93 percent
  Background    0 percent
  Kernel     7 percent
  Interrupt     1 percent
  Idle      0 percent

User@srx> show system core-dumps
-rw-r--r-- 1 root wheel 201589419 Sep 3 18:13 core-srxpfe-1725358188.core.tgz

This issue is being tracked in PR1765140 and has been fixed in the following JunOS versions:
23.3R2, 23.4R1, 24.1R1