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Cisco Bug: CSCvv48896 - Cisco 8201:kdump on console 'unable to handle kernel NULL pointer dereference' during reload

Last Modified

Sep 10, 2020

Products (1)

  • Cisco 8000 Series Routers

Known Affected Releases

7.0.14.BASE

Description (partial)

Release-note

Symptom:
Kernel crash during PXE boot on spitfire 8201 and 8202, while the router is going down

The snip of messages seen on the Router console:

WARNING: kernel relocated [736MB]: patching 82910 gdb minimal_symbol values
 
      KERNEL: /dev/fd/4                                                
    DUMPFILE: kernel.20200822-180422.core.slot0_RP0.kdump  [PARTIAL DUMP]
        CPUS: 8
        DATE: Sat Aug 22 11:04:19 2020
      UPTIME: 00:16:10
LOAD AVERAGE: 11.67, 6.18, 3.95
       TASKS: 566
    NODENAME: R1-Sherman
     RELEASE: 4.8.28-WR9.0.0.20_cgl
     VERSION: #1 SMP Sat Aug 8 03:38:38 UTC 2020
     MACHINE: x86_64  (2400 Mhz)
      MEMORY: 31.7 GB
       PANIC: "BUG: unable to handle kernel NULL pointer dereference at 00000000000000bb"
         PID: 7929
     COMMAND: "bcdl gsp bcdls_"
        TASK: ffffa3b0ee8cb880  [THREAD_INFO: ffffa3b0ee8cb880]
         CPU: 1
       STATE:  (PANIC)
 
/auto/thirdparty-sdk/host-x86_64/bin/crash-7.2.8-ext/cacheutils.so: shared object loaded
Warning: cgroup is not supported by this OS.
/auto/thirdparty-sdk/host-x86_64/bin/crash-7.2.8-ext/cgget.so: shared object loaded
/auto/thirdparty-sdk/host-x86_64/bin/crash-7.2.8-ext/dminfo.so: shared object loaded
/auto/thirdparty-sdk/host-x86_64/bin/crash-7.2.8-ext/echo.so: shared object loaded
/auto/thirdparty-sdk/host-x86_64/bin/crash-7.2.8-ext/fp.so: shared object loaded
/auto/thirdparty-sdk/host-x86_64/bin/crash-7.2.8-ext/gcore.so: shared object loaded
/auto/thirdparty-sdk/host-x86_64/bin/crash-7.2.8-ext/ksm.so: shared object loaded

Conditions:
The following Cisco 8000 series PIDs have the issue with the associated IOS-XR versions
Cisco 8201 running IOS-XR 7.0.11/7.0.12/7.0.13
Cisco 8202 running IOS-XR 7.2.1

The Routers in question are being reloaded via System upgrade or reloaded via any Reload CLI
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