Comment 8 for bug 1890236

@Andrius/stikonas

If you'd like this filed anywhere else, please just ask. (I usually verify reports on opensuse/fedora/debian before I file upstream; and that wasn't done, maybe hard to reproduce due lack of floppy support in many machines BIOS that is possibly essential to re-create issue)

Today's re-test on box documented here had a delay only on starting (less than a minute) before it responded and was usable. This test is using groovy/20.10 (not focal/20.04.1/2 daily)

** system in operation
Lubuntu groovy daily (live) 2020-10-18 on
- dell [optiplex] 745 (c2d-6600, 6gb, amd/ati radeon rv516/x1300/x1550)

apt-cache policy partitionmanager shows
partitionmanager:
  Installed: 4.1.0-1
        500 http://archive.ubuntu.com/ubuntu groovy/universe amd64

Full KPMCORE_DEBUG=1 output can be seen at
https://paste.ubuntu.com/p/QRnXcSBNsS/

It did not STOP & fail to continue today.. it just sat there for some time (less than a minute I believe but noticeable) with the last messages on terminal during 'pause' being
--
"Scanning devices..."
"Command: lsblk --nodeps --paths --sort name --json --output type,name"
"Command: blockdev --getsize64 /dev/fd0"
--
The message box that opened during this time read
"Scanning device '/dev/fd0'"
--

Scanning `dmesg` I see
--
[ 853.260553] blk_update_request: I/O error, dev fd0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[ 853.260560] floppy: error 10 while reading block 0
--

Closing and re-starting (after delay) partitionmanager caused the following to appear in `dmesg
--
[ 2476.713193] perf: interrupt took too long (2502 > 2500), lowering kernel.perf_event_max_sample_rate to 79750
[ 2529.179311] blk_update_request: I/O error, dev fd0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
[ 2529.179318] floppy: error 10 while reading block 0
--
(ie. same result except for 'perf:' line that maybe unrelated)

On fourth run of `KPMCORE_DEBUG=1 partitionmanager`
the following is a paste from `journalctl`
--
Oct 19 05:32:09 lubuntu dbus-daemon[1002]: [system] Activating service name='org.kde.kpmcore.externalcommand' requested by '>
Oct 19 05:32:09 lubuntu dbus-daemon[1002]: [system] Successfully activated service 'org.kde.kpmcore.externalcommand'
Oct 19 05:32:14 lubuntu sudo[2688]: pam_unix(sudo:session): session closed for user root
Oct 19 05:32:47 lubuntu kernel: blk_update_request: I/O error, dev fd0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio cla>
Oct 19 05:32:47 lubuntu kernel: floppy: error 10 while reading block 0
--