Renoise suddenly high CPU usage while sitting open in the background

lilith · January 10, 2026, 7:20pm

I had Renoise open today (project with VSTs also) while doing something else. Suddenly, after a few hours, my CPU usage went up like crazy and it was Renoise. I had to kill it. This is from the log:


CrashLog: Caught signal: SIGSEGV (11) ...
CrashLog: 0x11cc34e (anonymous namespace)::TThreadContext::SRun(void*) ???:0
CrashLog: 0x7e4bf569caa3 start_thread ./nptl/pthread_create.c:447
CrashLog: 0x7e4bf5729c6b clone3 ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
CrashLog: 0xffffffffffffffff ??? ???:0
CrashLog: Caught signal: SIGSEGV (11) ...
CrashLog: 0x1105dea TAudioPlayer::CalcBuffer(nonstd::span_lite::span<float const* const, 18446744073709551615ul>, nonstd::span_lite::span<float const* const, 18446744073709551615ul>, nonstd::span_lite::span<float* const, 18446744073709551615ul>, nonstd::span_lite::span<float* const, 18446744073709551615ul>, int, TAudioPlayer::TTransportState const*) ???:0
CrashLog: 0x1098546 TJackAudio::SProcess(unsigned int, void*) ???:0
CrashLog: 0x7e4bf55d943e ??? ???:0
CrashLog: 0x7e4bf582264c ??? ???:0
CrashLog: 0x7e4bf55267b5 ??? ???:0
CrashLog: 0x7e4bf569caa3 start_thread ./nptl/pthread_create.c:447
CrashLog: 0x7e4bf5729c6b clone3 ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
CrashLog: 0xffffffffffffffff ??? ???:0

Application: Caught an unhandled fatal exception (Thread: AUDIO SLAVES)!
Application: Saving a backup...

CrashLog: 0x11cc34e (anonymous namespace)::TThreadContext::SRun(void*) ???:0
CrashLog: 0x7e4bf569caa3 start_thread ./nptl/pthread_create.c:447
CrashLog: 0x7e4bf5729c6b clone3 ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
CrashLog: 0xffffffffffffffff ??? ???:0
CrashLog: 0x11cc34e (anonymous namespace)::TThreadContext::SRun(void*) ???:0
CrashLog: 0x7e4bf569caa3 start_thread ./nptl/pthread_create.c:447
CrashLog: 0x7e4bf5729c6b clone3 ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
CrashLog: 0xffffffffffffffff ??? ???:0
CrashLog: 0x11cc34e (anonymous namespace)::TThreadContext::SRun(void*) ???:0
CrashLog: 0x7e4bf569caa3 start_thread ./nptl/pthread_create.c:447
CrashLog: 0x7e4bf5729c6b clone3 ../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
CrashLog: 0xffffffffffffffff ??? ???:0

Audio Plugins: Timeout while waiting for the plugin device to suspend!

Application: Terminating...

System:
Ubuntu Noble with Pipewire

FZ99 · January 10, 2026, 7:59pm

Could be something about power managment if it happens after a few hours. One service wants to go to sleep /suspend, but something else wants to keep it awake with RT priorities. Just a guess.

lilith · January 10, 2026, 8:00pm

I was working on the PC, so it was not idle or so.

tkna · January 10, 2026, 8:03pm

Can you find any relevant information in syslog(journalctl) ?

lilith · January 10, 2026, 8:08pm

only this during the crash:

Jan 10 19:50:09 fox systemd[1]: sysstat-collect.service: Deactivated successfully.
Jan 10 19:50:09 fox systemd[1]: Finished sysstat-collect.service - system activity accounting tool.
Jan 10 19:52:15 fox dbus-daemon[1809]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.433' (uid=1000 pid=39976 comm="/usr/share/librewolf>
Jan 10 19:52:15 fox dbus-daemon[1809]: [system] Activation via systemd failed for unit 'rtkit-daemon.service': Unit rtkit-daemon.service is masked.
Jan 10 19:54:21 fox dbus-daemon[1809]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.434' (uid=1000 pid=40949 comm="/usr/share/librewolf>
Jan 10 19:54:21 fox dbus-daemon[1809]: [system] Activation via systemd failed for unit 'rtkit-daemon.service': Unit rtkit-daemon.service is masked.
Jan 10 19:55:01 fox CRON[41276]: pam_unix(cron:session): session opened for user root(uid=0) by root(uid=0)
Jan 10 19:55:01 fox CRON[41277]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Jan 10 19:55:01 fox CRON[41276]: pam_unix(cron:session): session closed for user root
Jan 10 19:39:31 fox systemd[1]: Finished man-db.service - Daily man-db regeneration.
Jan 10 19:39:41 fox systemd[4048]: Started app-gnome-kitty-33573.scope - Application launched by gsd-media-keys.
Jan 10 19:39:41 fox systemd[4048]: Started kitty-33573-0.scope - kitty child process: 33595 launched by: 33573.
Jan 10 19:39:41 fox kitty[33573]: ignoreboth or ignorespace present in bash HISTCONTROL setting, showing running command will not be robust
Jan 10 19:40:01 fox systemd[1]: Starting sysstat-collect.service - system activity accounting tool...
Jan 10 19:40:01 fox systemd[1]: sysstat-collect.service: Deactivated successfully.
Jan 10 19:40:01 fox systemd[1]: Finished sysstat-collect.service - system activity accounting tool.
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox gnome-shell[4310]: g_object_get_qdata: assertion 'G_IS_OBJECT (object)' failed
Jan 10 19:40:10 fox kernel: qpwgraph[6619]: segfault at 3d1 ip 00007e49f90e0f88 sp 00007ffdff6442c8 error 4 in libQt6Widgets.so.6.4.2[4e0f88,7e49f8d63000+459000] likely on CPU 9 (core 1, socket 0)
Jan 10 19:40:10 fox kernel: Code: 1f 00 48 8b 43 08 48 8b 98 90 00 00 00 48 85 db 75 d6 31 db 48 89 d8 48 8b 5d f8 c9 c3 90 0f 1f 40 00 f3 0f 1e fa 48 8b 47 08 <48> 8b 80 90 00 00 00 c3 f3 0f 1e fa 55 48 89 f8 48>
Jan 10 19:40:21 fox librewolf.desktop[33925]: [33925] Sandbox: CanCreateUserNamespace() unshare(CLONE_NEWPID): EPERM
Jan 10 19:40:21 fox kernel: audit: type=1400 audit(1768070421.149:288): apparmor="AUDIT" operation="userns_create" class="namespace" info="Userns create - transitioning profile" profile="unconfined" pid=33922 com>
Jan 10 19:40:21 fox kernel: audit: type=1400 audit(1768070421.149:289): apparmor="DENIED" operation="capable" class="cap" profile="unprivileged_userns" pid=33925 comm="librewolf" capability=21  capname="sys_admin"
Jan 10 19:40:21 fox systemd[4048]: Started app-gnome-librewolf-33922.scope - Application launched by gnome-shell.
Jan 10 19:40:21 fox dbus-daemon[1809]: [system] Activating via systemd: service name='org.freedesktop.timedate1' unit='dbus-org.freedesktop.timedate1.service' requested by ':1.416' (uid=1000 pid=33922 comm="/usr/>
Jan 10 19:40:21 fox systemd[1]: Starting systemd-timedated.service - Time & Date Service...
Jan 10 19:40:21 fox dbus-daemon[1809]: [system] Successfully activated service 'org.freedesktop.timedate1'
Jan 10 19:40:21 fox systemd[1]: Started systemd-timedated.service - Time & Date Service.
Jan 10 19:40:21 fox dbus-daemon[1809]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.418' (uid=1000 pid=34047 comm="/usr/share/librewolf>
Jan 10 19:40:21 fox dbus-daemon[1809]: [system] Activation via systemd failed for unit 'rtkit-daemon.service': Unit rtkit-daemon.service is masked.
Jan 10 19:40:21 fox dbus-daemon[1809]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.419' (uid=1000 pid=33922 comm="/usr/share/librewolf>
Jan 10 19:40:21 fox dbus-daemon[1809]: [system] Activation via systemd failed for unit 'rtkit-daemon.service': Unit rtkit-daemon.service is masked.
Jan 10 19:40:21 fox dbus-daemon[1809]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.420' (uid=1000 pid=34111 comm="/usr/share/librewolf>
Jan 10 19:40:21 fox dbus-daemon[1809]: [system] Activation via systemd failed for unit 'rtkit-daemon.service': Unit rtkit-daemon.service is masked.
Jan 10 19:40:22 fox dbus-daemon[1809]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.421' (uid=1000 pid=34176 comm="/usr/share/librewolf>
Jan 10 19:40:22 fox dbus-daemon[1809]: [system] Activation via systemd failed for unit 'rtkit-daemon.service': Unit rtkit-daemon.service is masked.
Jan 10 19:40:22 fox dbus-daemon[1809]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.423' (uid=1000 pid=34184 comm="/usr/share/librewolf>
Jan 10 19:40:22 fox dbus-daemon[1809]: [system] Activation via systemd failed for unit 'rtkit-daemon.service': Unit rtkit-daemon.service is masked.
Jan 10 19:40:26 fox dbus-daemon[1809]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.424' (uid=1000 pid=33922 comm="/usr/share/librewolf>
Jan 10 19:40:26 fox dbus-daemon[1809]: [system] Activation via systemd failed for unit 'rtkit-daemon.service': Unit rtkit-daemon.service is masked.
Jan 10 19:40:26 fox dbus-daemon[1809]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.425' (uid=1000 pid=34308 comm="/usr/share/librewolf>
Jan 10 19:40:26 fox dbus-daemon[1809]: [system] Activation via systemd failed for unit 'rtkit-daemon.service': Unit rtkit-daemon.service is masked.
Jan 10 19:40:26 fox dbus-daemon[1809]: [system] Activating via systemd: service name='org.freedesktop.RealtimeKit1' unit='rtkit-daemon.service' requested by ':1.426' (uid=1000 pid=34313 comm="/usr/share/librewolf>
Jan 10 19:40:26 fox dbus-daemon[1809]: [system] Activation via systemd failed for unit 'rtkit-daemon.service': Unit rtkit-daemon.service is masked.
Jan 10 19:40:51 fox systemd[1]: systemd-timedated.service: Deactivated successfully.
Jan 10 19:45:01 fox CRON[36550]: pam_unix(cron:session): session opened for user root(uid=0) by root(uid=0)
Jan 10 19:45:01 fox CRON[36551]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Jan 10 19:45:01 fox CRON[36550]: pam_unix(cron:session): session closed for user root

lilith · January 10, 2026, 8:15pm

also this one

Jan 10 19:34:42 fox systemd[1]: anacron.service: Deactivated successfully.
Jan 10 19:35:01 fox CRON[33217]: pam_unix(cron:session): session opened for user root(uid=0) by root(uid=0)
Jan 10 19:35:01 fox CRON[33218]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Jan 10 19:35:01 fox CRON[33217]: pam_unix(cron:session): session closed for user root
Jan 10 19:38:46 fox pipewire[4075]: spa.alsa: surround40:1p: follower avail:531 delay:531 target:1536 thr:1024, resync (0 suppressed)
Jan 10 19:39:01 fox CRON[33287]: pam_unix(cron:session): session opened for user root(uid=0) by root(uid=0)
Jan 10 19:39:01 fox CRON[33288]: (root) CMD (  [ -x /usr/lib/php/sessionclean ] && if [ ! -d /run/systemd/system ]; then /usr/lib/php/sessionclean; fi)
Jan 10 19:39:01 fox CRON[33287]: pam_unix(cron:session): session closed for user root
Jan 10 19:39:01 fox systemd[4048]: Started app-gnome-kitty-33290.scope - Application launched by gsd-media-keys.
Jan 10 19:39:01 fox systemd[4048]: Started kitty-33290-0.scope - kitty child process: 33312 launched by: 33290.
Jan 10 19:39:01 fox kitty[33290]: ignoreboth or ignorespace present in bash HISTCONTROL setting, showing running command will not be robust
Jan 10 19:39:29 fox systemd[4048]: app-gnome-librewolf-6670.scope: Consumed 37min 50.857s CPU time.
Jan 10 19:39:31 fox systemd[1]: Starting man-db.service - Daily man-db regeneration...
Jan 10 19:39:31 fox systemd[1]: man-db.service: Deactivated successfully.
Jan 10 19:39:31 fox systemd[1]: Finished man-db.service - Daily man-db regeneration.
Jan 10 19:39:41 fox systemd[4048]: Started app-gnome-kitty-33573.scope - Application launched by gsd-media-keys.
Jan 10 19:39:41 fox systemd[4048]: Started kitty-33573-0.scope - kitty child process: 33595 launched by: 33573.
Jan 10 19:39:41 fox kitty[33573]: ignoreboth or ignorespace present in bash HISTCONTROL setting, showing running command will not be robust
Jan 10 19:40:01 fox systemd[1]: Starting sysstat-collect.service - system activity accounting tool...
Jan 10 19:40:01 fox systemd[1]: sysstat-collect.service: Deactivated successfully.
Jan 10 19:40:01 fox systemd[1]: Finished sysstat-collect.service - system activity accounting tool.

ffx · January 11, 2026, 6:17am

Was it exactly Renoise, or a Renoise slave process?

lilith · January 11, 2026, 1:04pm

Can also be a plugin in Renoise of course.

tkna · January 11, 2026, 2:06pm

I’m not entirely sure, but depending on the use case, it might be necessary to make librewolf a real-time process.
Is the problem that it’s failing because rtkit-daemon.service is being masked?

martblek · January 11, 2026, 4:35pm

it looks like a buffer overflow when the plugin tried to go ‘to or from’ sleep mode. I’m guessing it’s the plugin i think.
Anyway, if you force quit Renoise and there was no response from the plugin, it’s logical.
Name of the plugin you suspect?

lilith · January 11, 2026, 5:13pm

I made music with Studel in Librewolf, but I think when Renoise consumed all my CPU I still had audio in Librewolf. Still a good idea to give Librewolf RT priorities. Will ask the Strudel guys if someone did this.

lilith · January 11, 2026, 5:17pm

Thanks. Can be Hive maybe or a TAL plugin, Airwindows, Luftikus or Loudmax. But I don’t have any clue. Didn’t happen to me before.

tkna · January 11, 2026, 7:28pm

First, try opening the same project in Renoise while using Studel in Librewolf to see if you can reproduce the issue.
If running a command like sudo systemctl unmask rtkit-daemon.service improves the situation, that’s likely the cause.