Ubuntu
zfcpdump-kernel package

  1. Bug #1722735
  2. Comment #2

Comment 2 for bug 1722735

Revision history for this message
Dimitri John Ledkov (xnox) wrote :

>> Please see
>> https://bugs.launchpad.net/ubuntu/+source/zfcpdump-kernel/+bug/1722735 which
>> has been requested for reverse-proxy.
>
> We looked into the report: It looks like the initramfs with the zfcpdump
> user space is not detected for some reason.

We believe this maybe a regression in the upstream kernel in v4.10 and later.
Exactly the same unchanged zfcpdump initrd is detected correctly by the v4.09 kernel.
Note that the zfcpdump initrd is shipped by s390-tools package, whilst the kernel image is shipped separately by the zfcpdump-kernel package. Therefore the initrd is good and is loadable by v4.09 kernel but not v4.10 kernel.
Or vice versa, v4.09 and earlier are more graceful and are loading the buggy zfcpdump initrd, but v4.10+ doesn't.

Could there be some config options, or configurations missing from the zfcpdump config?
We are using z13 mainframe - does kernel try to use hw accel compression? but the kernel or the LPAR are misconfigured?
Can you commit any kernel engineers to debug this further to find a root cause?