You have been subscribed to a public bug:
Seeing this in Questing Daily e.g. 20250713. On login, whether an
installed system or a live ISO, fusermount3 runs at 100% CPU for a few
minutes. This is whether the system is Kubuntu, Lubuntu, Ubuntu and
whether running on bare metal (old Acer travelmate 4740) or a QEMU/KVM
VM. It's especially noticeable on the Acer, which is not exactly
overpowered. After a few minutes, it goes away and the system settles
back into a low-CPU-usage state.
I'm assuming that this is an apparmor issue, on the basis of the
kern.log snippet below, but I actually don't know and it could be
something else.
2025-07-14T12:29:30.356949+12:00 ubuntuB kernel: audit: type=1400
audit(1752452970.354:230): apparmor="DENIED" operation="capable" class="cap"
profile="fusermount3" pid=2298 comm="fusermount3" capability=1
capname="dac_override"
2025-07-14T12:29:30.356963+12:00 ubuntuB kernel: audit: type=1400
audit(1752452970.354:231): apparmor="DENIED" operation="capable" class="cap"
profile="fusermount3" pid=2298 comm="fusermount3" capability=7 capname="setuid"
2025-07-14T12:29:30.356964+12:00 ubuntuB kernel: audit: type=1400
audit(1752452970.355:232): apparmor="DENIED" operation="capable" class="cap"
profile="fusermount3" pid=2299 comm="fusermount3" capability=7 capname="setuid"
2025-07-14T12:29:30.507045+12:00 ubuntuB kernel: audit: type=1400
audit(1752452970.505:233): apparmor="DENIED" operation="capable" class="cap"
profile="fusermount3" pid=2363 comm="fusermount3" capability=1
capname="dac_override"
2025-07-14T12:29:30.507058+12:00 ubuntuB kernel: audit: type=1400
audit(1752452970.505:234): apparmor="DENIED" operation="capable" class="cap"
profile="fusermount3" pid=2363 comm="fusermount3" capability=7 capname="setuid"
2025-07-14T12:29:30.507059+12:00 ubuntuB kernel: audit: type=1400
audit(1752452970.505:235): apparmor="DENIED" operation="capable" class="cap"
profile="fusermount3" pid=2364 comm="fusermount3" capability=7 capname="setuid"
2025-07-14T12:29:31.820945+12:00 ubuntuB kernel: rfkill: input handler disabled
2025-07-14T12:29:33.270952+12:00 ubuntuB kernel: input: spice vdagent tablet as
/devices/virtual/input/input6
2025-07-14T12:29:42.925880+12:00 ubuntuB kernel: audit: type=1400
audit(1752452982.924:236): apparmor="DENIED" operation="capable" class="cap"
profile="fusermount3" pid=3292 comm="fusermount3" capability=1
capname="dac_override"
2025-07-14T12:29:42.925965+12:00 ubuntuB kernel: audit: type=1400
audit(1752452982.924:237): apparmor="DENIED" operation="capable" class="cap"
profile="fusermount3" pid=3292 comm="fusermount3" capability=7 capname="setuid"
2025-07-14T12:29:42.925998+12:00 ubuntuB kernel: audit: type=1400
audit(1752452982.925:238): apparmor="DENIED" operation="capable" class="cap"
profile="fusermount3" pid=3293 comm="fusermount3" capability=7 capname="setuid"
2025-07-14T12:29:42.927893+12:00 ubuntuB kernel: audit: type=1400
audit(1752452982.926:239): apparmor="DENIED" operation="open" class="file"
profile="fusermount3" name="/run/mount/utab.lock" pid=3293 comm="umount"
requested_mask="rc" denied_mask="rc" fsuid=0 ouid=0
2025-07-14T12:29:42.927902+12:00 ubuntuB kernel: audit: type=1400
audit(1752452982.926:240): apparmor="DENIED" operation="open" class="file"
profile="fusermount3" name="/run/mount/utab.lock" pid=3293 comm="umount"
requested_mask="rc" denied_mask="rc" fsuid=0 ouid=0
** Affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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fusermount3 running at 100% CPU at login in Questing Daily
https://bugs.launchpad.net/bugs/2116834
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