Did you try as root / devel-su? That should show ALL processes.
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Oh, not! 
I’ll try later, thanks!
Vlagged, no specific apps installed. And nevermind, i kill all apps when this bug comes, and this not helps. It connected with Browser work, i sure.
And somehow restarting launcher (main screen, lipstick) from Settings - Utilities helps! Cpu become to sleep good again.
So this is Browser+lipstick bug. Main components of OS… 
Xperia XA2. 4.6.0.13, as in my sign.
Becoming root does not make a difference, nemo or defaultuser sees the same list of processes, there are no processes hidden for users.
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Does it affects Cpu/temperature after a notification is received? It might be a vase needing Project: sailfishos-notification-preview-high-cpu-usage-patch (you can install it through Patch Manager by looking into the Web Catalog)
I suspect I have same issue, I noticed that my battery life got worse suddenly, and crest showed systemd-logind and systemd-udevd with 20-30% usage.
Investigating with htop shows CPU usage spiking periodically. With the screen off htop shows even 70+% prolonged usage for systemd-logind during these spikes, with the screen on cpu usage spikes may appear, but these services do not always appear to be the cause.
Using trace, when screen is off, it can be seen that it spends lots of time doing open_at:
openat(19, "card0", O_RDONLY|O_LARGEFILE|O_NOFOLLOW|O_CLOEXEC|O_PATH) = 18
fstat64(18, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
close(19) = 0
...
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
23.69 3.419493 76 44980 openat
20.49 2.957528 65 44980 close
19.98 2.883829 151780 19 epoll_wait
17.84 2.575281 62 40951 fstat64
3.98 0.573906 72 7891 read
3.73 0.538043 90 5965 readlinkat
2.98 0.429861 108 3966 access
1.99 0.286792 72 3968 getuid32
...
With the screen on, systemd-logind processes seems to spend all (or most) of their time in epoll_wait, which might be expected (?):
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
100.00 560.319002 56031900 10 epoll_wait
0.00 0.003293 109 30 clock_gettime
...
systemd-udevd appears to spend most of the time at epoll_wait, regardless of screen being off:
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
95.83 20.361790 27778 733 epoll_wait
0.98 0.207701 88 2347 clock_gettime
0.92 0.195842 709 276 close
% time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
98.91 52.486729 133554 393 epoll_wait
0.26 0.137046 2141 64 clone
0.24 0.127409 101 1251 clock_gettime
....
Please enter this before “it happens”:
journalctl -f -u systemd-udevd -u systemd-logind
Then “make it happen”.
journalctl does not show any output for these two services.
journalctl / dmesg on the other hand shows spam related to suspend:
Jun 05 10:09:11 XperiaXA2 kernel: Restarting tasks ...
Jun 05 10:09:11 XperiaXA2 kernel: R0: [cds_mc_thread][2296257273443] [10:09:11.527455] wlan: [30991:E :WMA] Invalid length for GTK status
Jun 05 10:09:11 XperiaXA2 kernel: done.
Jun 05 10:09:11 XperiaXA2 kernel: PM: suspend exit 2025-06-05 07:09:11.563475904 UTC
Jun 05 10:09:11 XperiaXA2 kernel: PM: suspend entry 2025-06-05 07:09:11.563510382 UTC
Jun 05 10:09:11 XperiaXA2 kernel: PM: Syncing filesystems ... done.
Jun 05 10:09:11 XperiaXA2 kernel: Freezing user space processes ... (elapsed 0.009 seconds) done.
Jun 05 10:09:11 XperiaXA2 kernel: Freezing remaining freezable tasks ... (elapsed 0.003 seconds) done.
Jun 05 10:09:11 XperiaXA2 kernel: Suspending console(s) (use no_console_suspend to debug)
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:8][2296259606661] [10:09:11.648972] wlan: [22958:I :HDD] hdd_suspend_wlan: 1298: WLAN being suspended by OS
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:8][2296259606862] [10:09:11.648982] wlan: [22958:I :HDD] hdd_suspend_wlan: 1318: Disabling queues for dev mode QDF_STA_MODE
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:8][2296259608337] [10:09:11.649059] wlan: [22958:I :HDD] hdd_suspend_wlan: 1318: Disabling queues for dev mode QDF_P2P_DEVICE_MODE
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:6][2296259907817] [10:09:11.664657] wlan: [3690:I :HDD] __wlan_hdd_bus_suspend: 667: starting bus suspend; event:2, flags:0
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:6][2296259909482] [10:09:11.664743] wlan: [3690:I :WMI] suspend type: WOW_IFACE_PAUSE_DISABLED
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:6][2296259949762] [10:09:11.666841] wlan: [3690:I :HIF] hif_snoc_setup_wakeup_sources: expecting wake from ce 2, irq 152 enable 1
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:6][2296259950036] [10:09:11.666855] wlan: [3690:I :HDD] __wlan_hdd_bus_suspend: 711: bus suspend succeeded
Jun 05 10:09:11 XperiaXA2 kernel: PM: suspend of devices complete after 19.195 msecs
Jun 05 10:09:11 XperiaXA2 kernel: PM: late suspend of devices complete after 4.936 msecs
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:6][2296260124574] [10:09:11.675946] wlan: [3690:I :HDD] __wlan_hdd_bus_suspend_noirq: 770: start bus_suspend_noirq
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:6][2296260124907] [10:09:11.675963] wlan: [3690:I :HDD] __wlan_hdd_bus_suspend_noirq: 803: bus_suspend_noirq done
Jun 05 10:09:11 XperiaXA2 kernel: PM: noirq suspend of devices complete after 3.645 msecs
Jun 05 10:09:11 XperiaXA2 kernel: Disabling non-boot CPUs ...
Jun 05 10:09:11 XperiaXA2 kernel: suspend ns: 102615401125694 suspend cycles: 2296261471299
Jun 05 10:09:11 XperiaXA2 kernel: resume cycles: 2296261615693
Jun 05 10:09:11 XperiaXA2 kernel: Enabling non-boot CPUs ...
Jun 05 10:09:11 XperiaXA2 kernel: cache: parent cpu1 should not be sleeping
Jun 05 10:09:11 XperiaXA2 kernel: CPU1 is up
Jun 05 10:09:11 XperiaXA2 kernel: cache: parent cpu2 should not be sleeping
Jun 05 10:09:11 XperiaXA2 kernel: CPU2 is up
Jun 05 10:09:11 XperiaXA2 kernel: cache: parent cpu3 should not be sleeping
Jun 05 10:09:11 XperiaXA2 kernel: CPU3 is up
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:6][2296261720582] [10:09:11.759069] wlan: [3690:I :HDD] __wlan_hdd_bus_resume_noirq: 943: starting bus_resume_noirq
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:6][2296261720859] [10:09:11.759082] wlan: [3690:I :HDD] __wlan_hdd_bus_resume_noirq: 968: bus_resume_noirq done
Jun 05 10:09:11 XperiaXA2 kernel: PM: noirq resume of devices complete after 2.302 msecs
Jun 05 10:09:11 XperiaXA2 kernel: PM: early resume of devices complete after 4.830 msecs
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:6][2296261892495] [10:09:11.768022] wlan: [3690:I :HDD] __wlan_hdd_bus_resume: 855: starting bus resume
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:6][2296261892927] [10:09:11.768044] wlan: [3690:I :HIF] hif_snoc_setup_wakeup_sources: expecting wake from ce 2, irq 152 enable 0
Jun 05 10:09:11 XperiaXA2 kernel: R0: [soft_irq][2296262086690] [10:09:11.778135] wlan: [0:F :WMA] Non-WLAN triggered wakeup: UNSPECIFIED (-1)
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:6][2296262092217] [10:09:11.778423] wlan: [3690:I :HDD] __wlan_hdd_bus_resume: 904: bus resume succeeded
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:8][2296262093776] [10:09:11.778504] wlan: [22958:I :HDD] hdd_resume_wlan: 1354: WLAN being resumed by OS
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:8][2296262094085] [10:09:11.778521] wlan: [22958:I :HDD] hdd_resume_wlan: 1379: Enabling queues for dev mode QDF_STA_MODE
Jun 05 10:09:11 XperiaXA2 kernel: R0: [kworker/u16:8][2296262095850] [10:09:11.778612] wlan: [22958:I :HDD] hdd_resume_wlan: 1379: Enabling queues for dev mode QDF_P2P_DEVICE_MODE
Jun 05 10:09:11 XperiaXA2 kernel: FG: fg_get_time_to_full_locked: battery profile is not loaded
Jun 05 10:09:11 XperiaXA2 kernel: FG: ttf_work: failed to get ttf, rc=-61
Jun 05 10:09:11 XperiaXA2 kernel: PM: resume of devices complete after 15.259 msecs
Jun 05 10:09:11 XperiaXA2 kernel: Restarting tasks ...
edit: oops, I did not see all the discussion and analysis that already happened around this.
Has simply restarting these services already been discussed?