Troubleshooting
Problem
Some customers may have kdump configured in such a way that it dumps over a network using the ssh protocol.
If there is a change to the MAC address of the network interface over which kdump communicates, then kdump will fail until the kdump initrd is rebuilt.
Symptom
Under RHEL8:
A panic will trigger the boot of a kdump kernel and initrd. During that boot, these messages appear:
<warn> ... cmdline-reader: Mismatch between rd.znet_ifname and rd.znet
< 60 second pause >
systemd : Starting Kdump Vmcore Save Service...
kdump : Kdump is using the default log level(3).
kdump : wrong kdumpnic: enc230
Under RHEL9:
A panic will trigger the boot of a kdump kernel and initrd.
During that boot, for 60 seconds, these messages will appear every second:
A start job is running for nm-wait- ne-initrd.service (20s / no limit)
A start job is running for nm-wait- ne-initrd.service (21s / no limit)
...
Following this, the messages change to:
...
kdump: Waiting for network to be ready (48s / 10min)
kdump: Waiting for network to be ready (49s / 10min)
10 minutes later, the kdump aborts:
kdump: Oops. The network still isn't ready after waiting 10mins.
kdump: get_host_ip exited with non-zero status!
Document Location
Worldwide
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Document Information
Modified date:
08 August 2025
UID
ibm17241026