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Cisco Bug: CSCvu03290 - Cisco Nexus 9372 tahusd crash due to transceiver speed mismatch

Last Modified

Oct 27, 2020

Products (52)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 92304QC Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 31108TC-V Switch
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 92160YC-X Switch
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Known Affected Releases


Description (partial)

A Nexus 9372 switch could experience a crash in the Tahoe User Space Driver (tahusd) while trying to bring up a 40G port using a 100G transceiver:

N9K# sh int trans
    transceiver is present
    type is QSFP-100G-LR4-S
    name is CISCO-FINISAR
    part number is FTLC1151RDPL-C2
    revision is A 
    serial number is FNS23290AKK
    nominal bitrate is 25500 MBit/sec per channel
    Link length supported for 9/125um fiber is 10 km
    cisco id is 17
    cisco extended id number is 220
    cisco part number is 10-3146-02
    cisco product id is QSFP-100G-LR4-S
N9K# conf t
Enter configuration commands, one per line. End with CNTL/Z.
N9K(config)# int Eth1/6
N9K(config-if)# no shut
2020 Apr 28 18:23:12 N9K %$ VDC-1 %$ %SYSMGR-SLOT1-2-SERVICE_CRASHED: Service "tahusd" (PID 31341) hasn't caught signal 6 (core will be saved).
2020 Apr 28 18:23:15 N9K %$ VDC-1 %$ %SYSMGR-SLOT1-2-HAP_FAILURE_SUP_RESET: Service "tahusd" in vdc 1 has had a hap failure
2020 Apr 28 18:23:15 N9K %$ VDC-1 %$ %SYSMGR-SLOT1-2-LAST_CORE_BASIC_TRACE: fsm_action_become_offline: PID 18307 with message Could not turn off console logging on vdc 1 error: mts req-response with syslogd in vdc 1 failed (0xFFFFFFFF)  . 
2020 Apr 28 18:23:42 N9K %$ VDC-1 %$ Apr 28 18:23:42 %KERN-2-SYSTEM_MSG: [ 3979.796087] usd process 31341, uuid 1356 (0x54c) failed to send heartbeat - kernel
2020 Apr 28 18:23:56 N9K %$ VDC-1 %$ %SYSMGR-SLOT1-2-LAST_CORE_BASIC_TRACE: core_client_main: PID 5482 with message filename = 0x102_tahusd_log.31341.tar.gz . 
2020 Apr 28 18:23:57 N9K %$ VDC-1 %$ %MODULE-2-MOD_DIAG_FAIL: Module 1 (Serial number: SALXXXXXXXX) reported failure due to Service on linecard had a hap-reset in device DEV_SYSMGR (device error 0x54c)

A Nexus 9372 switch is in use, and a 100G QSFP transceiver is inserted.

The crash occurs when the port is brought up, either via 'no shutdown', or, if the port is already admin up, when the transceiver is installed.

If the configuration has already been saved and the transceiver stays in place, this will result in a crash loop when the switch comes back up and tries to bring the port back up again.
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