This KB describes a scenario where an EX3400 switch crashed generating a core-dump on 20.2R3 JunOS version.

Observed production EX3400-48 crashed with the following core-dump.

Model: ex3400-48t
Junos: 20.2R3-S5.6

root@switch show system core-dumps no-forwarding

/var/crash/*core*: No such file or directory
-rw-rw----  1 root  wheel    2928687 mmm ddd hh:mm /var/tmp/chassisd.core-tarball.0.tgz
-rw-rw----  1 root  wheel    2990402 mmm ddd hh:mm /var/tmp/chassisd.core-tarball.1.tgz
/var/tmp/pics/*core*: No such file or directory
/var/crash/kernel.*: No such file or directory
/var/jails/rest-api/tmp/*core*: No such file or directory
/tftpboot/corefiles/*core*: No such file or directory
total files: 2

• Debugging the core-dumps matches a known PR were the listed the following JunOS version for fix:

junos:19.3R3-S7

junos:19.4R2-S7

junos:19.4R3-S13

junos:20.3R3-S5

junos:20.4R3-S4

junos:21.1R3-S2

junos:21.2R2-S1

junos:21.2R3

junos:21.3R2

junos:21.4R1

junos:22.1R1

• Please note that the above-listed versions are not under JTAC support, nor the current OS 20.2R3-S5.6, since 12/30/2023 Junos OS Dates & Milestones - Juniper Networks
• Please, consider performing a JunOS upgrade to a stable version, which includes the fixed code: Junos Software Versions - Suggested Releases to Consider and Evaluate