------- Comment From [email protected] 2020-07-24 06:10 EDT------- (In reply to comment #29) > I just wanted to try the kernel that I've build yesterday (see comment #6) > and as a first step I wanted to recreate re-create the described error > situation on an up to date 20.04 system: > $ lsb_release -a > No LSB modules are available. > Distributor ID: Ubuntu > Description: Ubuntu 20.04 LTS > Release: 20.04 > Codename: focal > $ uname -a > Linux zlin42 5.4.0-40-generic #44-Ubuntu SMP Mon Jun 22 23:57:33 UTC 2020 > s390x s390x s390x GNU/Linux > $ apt-cache policy linux-generic > linux-generic: > Installed: 5.4.0.40.43 > Candidate: 5.4.0.40.43 > Version table: > *** 5.4.0.40.43 500 > 500 http://ports.ubuntu.com/ubuntu-ports focal-updates/main s390x Packages > 500 http://ports.ubuntu.com/ubuntu-ports focal-security/main s390x Packages > 100 /var/lib/dpkg/status > 5.4.0.26.32 500 > 500 http://ports.ubuntu.com/ubuntu-ports focal/main s390x Packages > $ > > But by surprise I didn't ran into any problems! > > I was able to flawlessly make use of FBA devices in the following three > different way: > 1) (re-)used a FBA device that was previously in use, without wiping out any > data > 2) used a FBA device that I wiped out using wipefs > 3) used a FBA device that I entirely wiped out (and zeroed) using dd > (see the attached doc for more details) > > Looks like a fix for this problem came in with the kernels that were rolled > out in between 5.4.0-29-generic and 5.4.0-40-generic. > (Again I didn't installed the patched kernel, I just used the latest > official one.) > > Message to the initial bug reporter: > Please can you retry on an up-to-date 20.04 system (or after having updated > your existing one, like for example with "sudo apt -y -q update && sudo apt > -y -q full-upgrade" plus reboot in case the kernel got update, what I assume > will happen)?
The issue is more likely to occur when the system has > 2GB of memory. I can't see in your attachment what system configuration you're running, but maybe that's the reason you're not running into the problem. This was also my mistake when I tried to reproduce the problem. Once I had my configuration changed to 8GB of memory I ran into the error immediately. The problem really is that the ZERO_PAGE allocation for the discard I/O can't be used on systems with > 2GB of memory. The fix I proposed actually solves the problem and is currently in review. I'll post the commit id once the fix went upstream. Jan -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1879707 Title: [UBUNTU 20.04] mke2fs dasd(fba),Failing CCW,default ERP has run out of retries and failed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1879707/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
