I tried to re-create the situation over here.
I have a z/VM 6.4:
q cplevel
z/VM Version 6 Release 4.0, service level 1901 (64-bit)
Generated at 06/14/19 14:15:49 UTC
and there is a VM guest running from the time I did 18.04.4 regression testing,
hence it's up since quite some time:
buntu@zbox:~$ uptime
05:16:47 up 36 days, 22:17, 1 user, load average: 0.00, 0.00, 0.00
but has an older kernel:
ubuntu@zbox:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.4 LTS
Release: 18.04
Codename: bionic
ubuntu@zbox:~$ uname -a
Linux zbox 4.15.0-76-generic #86-Ubuntu SMP Fri Jan 17 17:23:44 UTC 2020 s390x
s390x s390x GNU/Linux
ubuntu@zbox:~$
It has 4 FBA devices:
$ lszdev | grep yes
dasd-eckd 0.0.0200 yes yes dasda
dasd-fba 0.0.0101 yes yes dasdc
dasd-fba 0.0.0102 yes yes dasdb
dasd-fba 0.0.0103 yes yes dasdd
dasd-fba 0.0.0104 yes yes dasde
qeth 0.0.0600:0.0.0601:0.0.0602 yes yes enc600
generic-ccw 0.0.0009 yes yes
I had a look at the logs (dmesg,syslog) and couldn't find any problems with FBA
devices:
ubuntu@zbox:~$ dmesg -xT -l emerg,alert,crit,err
ubuntu@zbox:~$ grep 'error\|fail\|crash\|warn\|crit' /var/log/syslog
Mar 12 06:57:46 zbox systemd-resolved[371]: Server returned error NXDOMAIN,
mitigating potential DNS violation DVE-2018-0001, retrying transaction with
reduced feature level UDP.
Mar 12 09:21:16 zbox systemd-resolved[371]: Server returned error NXDOMAIN,
mitigating potential DNS violation DVE-2018-0001, retrying transaction with
reduced feature level UDP.
ubuntu@zbox:~$
So I upgraded the system to the latest package and kernel level:
ubuntu@zbox:~$ sudo apt -y -q update && sudo apt -y -q full-upgrade && sudo apt
autoremove --purge
ubuntu@zbox:~$ lsb_release -r
Release: 18.04
ubuntu@zbox:~$ uname -a
Linux zbox 4.15.0-88-generic #88-Ubuntu SMP Tue Feb 11 20:11:02 UTC 2020 s390x
s390x s390x GNU/Linux
ubuntu@zbox:~$
ubuntu@zbox:~$ dmesg -xT -l emerg,alert,crit,err
And I still cannot find any FBA issues:
ubuntu@zbox:~$ grep 'error\|fail\|crash\|warn\|crit' /var/log/syslog
Mar 12 06:57:46 zbox systemd-resolved[371]: Server returned error NXDOMAIN,
mitigating potential DNS violation DVE-2018-0001, retrying transaction with
reduced feature level UDP.
Mar 12 09:21:16 zbox systemd-resolved[371]: Server returned error NXDOMAIN,
mitigating potential DNS violation DVE-2018-0001, retrying transaction with
reduced feature level UDP.
ubuntu@zbox:~$
You mentioned that things might happen under load, so I created and copied
files with dd, and ran bonnie++ to create some more disk utilization and even
ran partially stress-ng in parallel,
but still cannot recreate the FBA issue.
In other words I was not able to recreate the problem. I work on a z13 with a
DS8870.
What about your system? Did you double checked that there are no issues in the
environment and the FBA definition?
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: ubuntu-z-systems
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1867118
Title:
dasd_fba io error and kernel panic
Status in Ubuntu on IBM z Systems:
Incomplete
Status in linux package in Ubuntu:
Incomplete
Bug description:
Generated I/O errors every hour in syslog and caused kernel panic with
workloads running
---uname output---
Linux ubuntutest01 4.15.0-88-generic #88-Ubuntu SMP Tue Feb 11 20:11:02 UTC
2020 s390x s390x s390x GNU/Linux
---Patches Installed---
distro provided. up-to-date from Ubuntu18.04.
Machine Type = z15
---System Hang---
The hourly generated I/O errors didn't impact the system up and running.
When there are workloads on it, it will cause kernel panic and rebooted the
server.
---Debugger---
A debugger is not configured
---Steps to Reproduce---
After migrated from 16.04 to 18.04, will see the i/o errors.
Stack trace output:
no
Oops output:
no
System Dump Info:
The system is not configured to capture a system dump.
Device driver error code:
[52297.898232] dasd.5c0c98: 0.0.0100: default ERP has run out of retries and
failed
[52297.898244] dasd(fba): I/O status report for device 0.0.0100:
dasd(fba): in req: 000000002e142bcd CS: 0x20 DS: 0x0C
dasd(fba): device 0.0.0100: Failing CCW: 00000000a84f6c9f
dasd(fba): SORRY - NO VALID SENSE AVAILABLE
[52297.898255] dasd(fba): Related CP in req: 000000002e142bcd
dasd(fba): CCW 00000000d15f44d3: 63400010 7FE2BBA0 DAT:
00000200 008150F2 00000000 00000017
dasd(fba): CCW 00000000b09ad76e: 43400008 7FE2BBB0 DAT:
05000006 00000000
dasd(fba): CCW 00000000c44dfb20: 41600C00 F3600000 DAT:
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
dasd(fba): CCW 00000000a84f6c9f: 43400008 7FE2BBB8 DAT:
05000010 00000006
dasd(fba): CCW 0000000022dac88c: 41600000 00000000 DAT:
dasd(fba): CCW 0000000069686544: 43400008 7FE2BBC0 DAT:
05000002 00000016
dasd(fba): CCW 000000007bb6a17c: 41200400 F3600000 DAT:
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[52297.898278] print_req_error: I/O error, dev dasda, sector 8474866
*Additional Instructions for y...@cn.ibm.com:
-Attach sysctl -a output output to the bug.
[reply] [?]
Internal Only
Comment 1 QI YE 2020-03-12 02:29:20 CDT
The z/VM version 6.4
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