MPC10E restarted with coredump
Slot 7 information:
State Online
<snip>
Start time 2026-08-09 11:01:11 EAT
Uptime 1 hour, 3 minutes, 26 seconds
-rw-r--r-- 1 root wheel 1606708 Aug 2 23:07 /var/crash/core-Router-re0-fpc7-sensord.0.tgz
-rw-r--r-- 1 root wheel 1479963 Aug 9 11:00 /var/crash/core-Router-re0-fpc7-sensord.1.tgz
As per logs, the FPC has went to reconnect which caused the reboot.
Aug 9 11:00:10 Router : %USER-1: fpc7 1 2026-08-09T11:00:10.641533+03:00 Router-fpc7 - - [timeQuality tzKnown="1" isSynced="0"] Coredump started for Router-fpc7-sensord
Aug 9 11:00:11 Router : %PFE-3: fpc7 pfeman_rt_process_aft_socket_trigger: socket close event for connection 11, so_error=success
Aug 9 11:00:11 Router : %USER-1: fpc7 1 2026-08-09T11:00:11.360649+03:00 Router-fpc7 - - [timeQuality tzKnown="1" isSynced="0"] Coredump has been created on FPC base-os. Router-fpc7-sensord
Aug 9 11:00:11 Router : %PFE-5: fpc7 user.notice root: run_aft.sh[2082657]-fmpc.elf: wait_on_coredump sensord
Aug 9 11:00:11 Router : %PFE-5: fpc7 user.notice root: run_aft.sh[2082657]-fmpc.elf: monitor_pid 2475406, delay:1, timeout:0
Aug 9 11:00:11 Router : %USER-1: fpc7 1 2026-08-09T11:00:11.778374+03:00 Router-fpc7 - - [timeQuality tzKnown="1" isSynced="0"] Coredump has been transferred to RE. Router-fpc7-sensord
Aug 9 11:00:13 Router : %PFE-5: fpc7 user.notice root: run_aft.sh[2082657]-fmpc.elf: monitor_pid 2475406 - stopped after 2 seconds
Aug 9 11:00:13 Router : %PFE-5: fpc7 user.notice root: run_aft.sh[2082657]-fmpc.elf: Core dump written, waiting 20 seconds to make sure it get to the RE
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Aug 9 11:00:36 Router : %PFE-0: fpc7 CMLC: Chassis Manager terminated
Aug 9 11:00:36 Router chassisd[25293]: %DAEMON-3-CHASSISD_IPC_CONNECTION_DROPPED: Dropped IPC connection for FPC 7
Aug 9 11:00:36 Router chassisd[25293]: %DAEMON-4-CHASSISD_IPC_WRITE_ERR_NULL_ARGS: FRU has no connection arguments fru_send_msg FPC 7
Aug 9 11:00:36 Router chassisd[25293]: %DAEMON-5-CHASSISD_IFDEV_DETACH_FPC: ifdev_detach_fpc(7)
Based on the core dump, issue was isolated to PR 1964847, by Engineering.
https://prsearch.juniper.net/PR1964847
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The sensord daemon may generate a core dump on MX platforms with MPC10 line cards when telemetry subscriptions are active for sensors such as cmerror, fabric, transceiver, or optics.
The issue is caused by a timing-dependent race condition and may result in an FPC restart.
The issue is intermittent and does not occur every time the trigger conditions are met. The issue can be identified by the presence of a sensord core file.