== Comment: #0 - Thorsten Diehl <email address hidden> - 2016-01-21 06:26:08 ==
Ubuntu installer on z Systems as of 2016-01-20 with kernel 4.3.0-6-generic throws a user process fault, when trying to offer a huge list of OSA network adaptor triples:
[ 2.657035] dasd_mod: module verification failed: signature and/or required k
ey missing - tainting kernel
[ 2.743908] qeth: loading core functions
"
"Starting system log daemon: syslogd, klogd.
"
"[1;24r[4l(B)0[m[1;24r[H[J[24;1H[m
"
"Configure the network device
----------------------------
Please choose the type of your primary network interface that you will need for
installing the Debian system (via NFS or HTTP). Only the listed devices are
supported.
Network device type:
1: ctc: Channel to Channel (CTC) or ESCON connection,
2: qeth: OSA-Express in QDIO mode / HiperSockets,
3: iucv: Inter-User Communication Vehicle - available for VM guests only,
4: virtio: KVM VirtIO,
Prompt: '?' for help>
"
"2
!! ERROR: Installation step failed
An installation step failed. You can try to run the failing item again from the
menu, or skip it and choose something else. The failing step is: Configure the
network device
[Press enter to continue]
"
"[ 31.165584] User process fault: interruption code 0010 ilc:2 in libc.so.6[3ff
91f80000+114000]
[ 31.165591] failing address: 000003fffc900000 TEID: 000003fffc900400
[ 31.165592] Fault in primary space mode while using user ASCE.
[ 31.165594] AS:000000007896c1c7 R3:000000007d368007 S:0000000000000020
"
In the above case I had more than 150 OSA triples, which is for sure very unusual. I could not determine the exact number, at which the problem starts to occur. The installer, however, is able to show around 100 OSA triples, but, when selecting one of them, at this point the user process fault occurs, too.
With 64 triples it worked.
I suggest to define the following restriction for the "z Systems" specific section of the "Release Notes" document:
Problem: Installer can not select out of more than 60 OSA network devices (triples)
Circumvention: Reduce the number of visible OSA network devices, e.g. by using the cio_ignore kernel parameter.
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