On Junos SRX1500 platforms, in a rare case scenario, if linux watchdogd is struck due to SSD(solid-state drives) IO operations, it causes the router to reboot.

The below logs could be seen during the issue.

 "SSD failure detected, system is going to reboot!!"

On the Junos SRX1500 platform, the device reboots spontaneously because the watchdog is triggered unnecessarily.

The PR1845143 only affects the SRX1500 platform. All of the other platforms  (eg SRX4200/4100 etc.) are confirmed to be not impacted.