QPS crashing on some hardware (hyperthreading-related?)

cookie.monster · February 7, 2026, 10:04am

Hi there,

I have noticed that QPS, the system tool that displays and manage processes, installed by default cannot work when the CPU mitigation file is loaded by GRUB (/etc/default/grub.d/40_cpu_mitigations.cfg).

Once this configuration file isn’t loaded by GRUB, the application QPS works fine.

arraybolt3 · February 8, 2026, 12:19am

What in particular isn’t working? It seems fine here, and I have 40_cpu_mitigations.cfg enabled.

cookie.monster · February 8, 2026, 12:31am

When trying to launch QPS from terminal, it returns a message saying that CPU can’t be reached in its entirely. Sorry, not in front of the machine to reproduce it right now

arraybolt3 · February 8, 2026, 12:47am

Hmm, ok. If you can take a screenshot once you can reproduce it, that would be quite useful.

cookie.monster · February 8, 2026, 2:25am

I have reproduced it once the CPU mitigations cfg file is again taken into account by GRUB. See image.

Besides, htop and top work just fine, with or without the CPU mitigations cfg.

arraybolt3 · February 8, 2026, 2:39am

Can you run cat /proc/stat on the affected machine and share the output here?

cookie.monster · February 8, 2026, 7:58am

Here is the result (picture from Mobile, can’t connect the machine to the net right now)

arraybolt3 · February 8, 2026, 3:23pm

OK, I think I know what’s going on. One last test, can you please:

Disable the CPU mitigations file the same way you did before (presumably something like sudo mv /etc/default/grub.d/40_cpu_mitigations.cfg /home/sysmaint/; sudo update-grub)
Reboot the system, but then when the boot menu appears…
…hover over PERSISTENT Mode | USER Session | daily activities, and then press e rather than pressing Enter.
Move the cursor to the line that starts with the word linux, then move it to the end of the line.
Type a single space, then type nosmt=force.
Press Ctrl+X to boot with the modified boot configuration.
Try to launch QPS again and see if it fails with the same error.

I think what’s happening is that your CPU doesn’t present all cores as contiguous when hyperthreading is turned off, and QPS doesn’t know how to handle gaps in the cores.

cookie.monster · February 15, 2026, 1:51am

Hello,

Sorry for late reply.

I did follow your instructions and QPS still falls to start with the same error:

arraybolt3 · February 15, 2026, 2:18pm

Yeah, then that’s almost certainly what’s happening. I’ll report the issue to LXQt and Debian.

cookie.monster · February 16, 2026, 3:23am

Thanks, I hope this can help

arraybolt3 · February 25, 2026, 4:52am

Reproduced, reported upstream:

github.com/lxqt/qps

Crashes on systems with non-contiguous CPU cores in /proc/stat

opened 04:41AM - 25 Feb 26 UTC

ArrayBolt3

Disabling hyperthreading on some modern Intel Core CPUs can result in a system h…aving a non-contiguous set of CPU cores in `/proc/stat`. On such systems, qps crashes immediately with an error like `Qps: Error reading info for cpu5 (/proc/stat)`. For instance, this is what my i9-14900HX system shows in `/proc/stat` when booted normally: ``` cpu 997 0 1235 861802 327 267 138 0 0 0 cpu0 12 0 25 26869 21 56 32 0 0 0 cpu1 11 0 35 26948 3 6 5 0 0 0 cpu2 32 0 36 26924 9 10 4 0 0 0 cpu3 5 0 14 26999 0 3 2 0 0 0 cpu4 228 0 125 26604 26 14 7 0 0 0 cpu5 20 0 19 26981 0 3 1 0 0 0 cpu6 171 0 202 26565 44 13 7 0 0 0 cpu7 11 0 78 26922 3 7 2 0 0 0 cpu8 52 0 52 26849 55 7 4 0 0 0 cpu9 5 0 15 26998 0 3 3 0 0 0 cpu10 75 0 57 26780 59 24 14 0 0 0 cpu11 3 0 15 26999 0 3 1 0 0 0 cpu12 52 0 61 26866 28 6 3 0 0 0 cpu13 3 0 25 26994 0 2 1 0 0 0 cpu14 37 0 43 26920 10 7 3 0 0 0 cpu15 3 0 17 27002 0 3 1 0 0 0 cpu16 24 0 39 26946 8 6 3 0 0 0 cpu17 22 0 24 26975 1 4 1 0 0 0 cpu18 18 0 19 26970 14 3 1 0 0 0 cpu19 14 0 20 26982 5 4 2 0 0 0 cpu20 17 0 57 26943 1 4 2 0 0 0 cpu21 12 0 20 26982 8 4 1 0 0 0 cpu22 19 0 30 26967 5 4 1 0 0 0 cpu23 20 0 23 26970 3 5 3 0 0 0 cpu24 18 0 24 26978 2 3 1 0 0 0 cpu25 16 0 25 26973 4 5 3 0 0 0 cpu26 10 0 18 26994 0 4 1 0 0 0 cpu27 14 0 21 26975 0 10 2 0 0 0 cpu28 16 0 19 26981 1 5 2 0 0 0 cpu29 15 0 20 26968 0 16 4 0 0 0 cpu30 14 0 19 26985 1 4 2 0 0 0 cpu31 15 0 22 26979 0 5 3 0 0 0 intr 806041 0 749 0 0 0 0 0 0 0 139 0 0 140 0 0 0 0 0 30 0 0 0 0 0 0 0 0 5980 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 928 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 1 0 0 27874 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 52 10 0 0 4 39 52 6 0 2 2 1 13 4 24 0 16 30 50 15 0 1 0 0 0 0 11 2 2 119 39 54 10 3 1652 49 123 123 0 0 0 0 0 0 0 0 0 0 0 0 0 0 490 4 12 4 0 2 45 2 21 3 6 1 3 5 34 5 0 1077 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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what happens when starting `qps` in this configuration: ``` DEBUG: version = 61809 Qps(0x55b565389d70, name="qps_main_window") ``` This is what `/proc/stat` looks like when booting the same system with the `nosmt=force` kernel parameter: ``` cpu 742 0 1269 83374 237 176 38 0 0 0 cpu0 32 0 64 3423 4 41 4 0 0 0 cpu2 44 0 39 3478 4 4 1 0 0 0 cpu4 20 0 27 3512 1 5 1 0 0 0 cpu6 22 0 72 3470 3 5 0 0 0 0 cpu8 10 0 128 3429 4 3 0 0 0 0 cpu10 11 0 40 3508 1 15 0 0 0 0 cpu12 14 0 31 3524 0 3 0 0 0 0 cpu14 9 0 32 3530 1 3 0 0 0 0 cpu16 22 0 30 3518 2 3 0 0 0 0 cpu17 16 0 49 3504 2 3 0 0 0 0 cpu18 28 0 69 3416 24 21 10 0 0 0 cpu19 38 0 59 3440 31 5 1 0 0 0 cpu20 32 0 52 3482 3 5 1 0 0 0 cpu21 31 0 48 3484 5 4 0 0 0 0 cpu22 17 0 32 3521 2 3 0 0 0 0 cpu23 24 0 42 3500 3 4 1 0 0 0 cpu24 18 0 51 3486 4 7 1 0 0 0 cpu25 14 0 35 3522 1 3 0 0 0 0 cpu26 50 0 50 3462 4 5 1 0 0 0 cpu27 59 0 60 3424 24 4 1 0 0 0 cpu28 40 0 67 3444 13 6 1 0 0 0 cpu29 62 0 83 3332 81 6 1 0 0 0 cpu30 60 0 39 3461 6 4 1 0 0 0 cpu31 57 0 49 3459 2 4 1 0 0 0 intr 581777 0 145 0 0 0 0 0 0 0 140 0 0 140 0 0 0 0 0 30 0 0 0 0 0 0 0 0 8369 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1067 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 1 0 0 21920 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 52 52 0 6 15 29 47 38 0 31 0 13 0 51 11 2 2 24 0 5 2 9 8 0 12 13 10 0 1 33 14 29 23 24 1098 0 49 123 123 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 142 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 691 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ctxt 218994 btime 1771993789 processes 1187 procs_running 1 procs_blocked 0 softirq 81458 167 5823 12 142 6981 8 21836 18391 0 28098 ``` Note that every other CPU core up to cpu16 is missing. This is what happens when trying to start `qps` in this state: ``` DEBUG: version = 61809 Qps: Error reading info for cpu5 (/proc/stat) Aborted (core dumped) qps ``` LXQt version: 2.3.0 Qt version: 6.10.2 Distribution: Arch Linux