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[Bug 2116834] Re: fusermount3 running at 100% CPU at login in Questing Daily

To: debcrafters-packages@xxxxxxxxxxxxxxxxxxx
From: Nick Rosbrook <2116834@xxxxxxxxxxxxxxxxxx>
Date: Tue, 15 Jul 2025 16:31:58 -0000
Reply-to: Bug 2116834 <2116834@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx
Upstream report for fuse3:
https://github.com/libfuse/libfuse/issues/1284

** Bug watch added: github.com/libfuse/libfuse/issues #1284
   https://github.com/libfuse/libfuse/issues/1284

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https://bugs.launchpad.net/bugs/2116834

Title:
  fusermount3 running at 100% CPU at login in Questing Daily

Status in apparmor package in Ubuntu:
  Triaged
Status in fuse3 package in Ubuntu:
  New

Bug description:
  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

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