This change was made by a bot.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2039173
Title:
tc goes to 100% CPU and locks up the system on recent 5.15 kernels
Status in linux package in Ubuntu:
Confirmed
Bug description:
Install a new Ubuntu 22.04 Jammy system and run the following commands
in a bash shell:
sudo -i
apt-get update && apt-get install -y iproute2 # often not necessary
depmod -a
modprobe ifb numifbs=1
ip link add ifb0 type ifb
ip link set dev ifb0 up
tc qdisc add dev lo ingress
tc filter add dev lo parent ffff: protocol ip u32 match u32 0 0 action mirred
egress redirect dev ifb0
tc qdisc add dev lo root handle 1: htb
tc qdisc add dev ifb0 root handle 1: htb direct_qlen 1000
echo "next command may lock up"
tc qdisc add dev ifb0 parent 1:1 handle 10: netem limit 100 delay 100ms 20ms
distribution normal
and you will see tc's CPU usage go to 100% and soon after the entire
system will lock up. tc in this state cannot be killed, even with kill
-9.
This happens on the October 10th version
https://cloud-images.ubuntu.com/jammy/20231010/jammy-server-cloudimg-amd64.ova,
which has kernel version 5.15.0-86-generic.
It does not happen on the previous version
https://cloud-images.ubuntu.com/jammy/20230929/jammy-server-cloudimg-amd64.ova,
which has kernel version 5.15.0-84-generic.
On the 5.15.0-84-generic version, the final TC command gives an error
"Error: Specified class not found.". This is not seen on the
"5.15.0-86-generic" version.
Therefore I believe this is a regression between these two kernel
versions 5.15.0-84 and 5.15.0-86. The tc binary is identical and the
iproute2 library has the same version on both installations.
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.15.0-86-generic 5.15.0-86.96
ProcVersionSignature: Ubuntu 5.15.0-86.96-generic 5.15.122
Uname: Linux 5.15.0-86-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Oct 11 17:07 seq
crw-rw---- 1 root audio 116, 33 Oct 11 17:07 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
CasperMD5CheckResult: unknown
CloudArchitecture: x86_64
CloudID: ovf
CloudName: ovf
CloudPlatform: ovf
CloudSubPlatform: ovf (iso)
Date: Wed Oct 11 17:14:39 2023
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb: Error: command ['lsusb'] failed with exit code 1:
Lsusb-t:
Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1:
MachineType: VMware, Inc. VMware Virtual Platform
PciMultimedia:
ProcEnviron:
TERM=vt100
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
ProcFB: 0 svgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-86-generic
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0
RelatedPackageVersions:
linux-restricted-modules-5.15.0-86-generic N/A
linux-backports-modules-5.15.0-86-generic N/A
linux-firmware N/A
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/12/2018
dmi.bios.release: 4.6
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: 440BX Desktop Reference Platform
dmi.board.vendor: Intel Corporation
dmi.board.version: None
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.ec.firmware.release: 0.0
dmi.modalias:
dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd12/12/2018:br4.6:efr0.0:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:sku:
dmi.product.name: VMware Virtual Platform
dmi.product.version: None
dmi.sys.vendor: VMware, Inc.
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