Here to say a straight forward and obvious sign of an affected system is
the presence of multiple CPUs with full grey bars in htop when a system
is otherwise completely idle with no processes in D state.
$ uname -a
Linux ... 6.17.0-20-generic #20-Ubuntu SMP PREEMPT_DYNAMIC Fri Mar 13 20:07:29
UTC 2026 x86_64 GNU/Linux
$ awk '/procs_blocked/ {print}' /proc/stat
procs_blocked 12
$ uptime
14:07:21 up 14:11, 1 user, load average: 0.29, 0.29, 0.41
I'm using Ubuntu 25.10 with these devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: HL-DT-ST Model: DVD+-RW GH50N Rev: B100
Type: CD-ROM ANSI SCSI revision: 05
Host: scsi6 Channel: 00 Id: 00 Lun: 00
Vendor: Lexar Model: USB Flash Drive Rev:
Type: Direct-Access ANSI SCSI revision: 04
Note I'm also using VDO with the USB drive:
sda 8:0 1 116.1G 0 disk
└─usb--vg-vpool0_vdata 252:2 0 64G 0 lvm
└─usb--vg-vpool0-vpool 252:3 0 204.1G 0 lvm
└─usb--vg-sweep 252:4 0 204.1G 0 lvm /mnt/src
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2146707
Title:
Boot-time SCSI async probe leaks nr_iowait (procs_blocked) — USB card
reader 05e3:0751
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2146707/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
