[Bug 2144926] Re: Network issues without any kind of visible dropped packages

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https://bugs.launchpad.net/bugs/2144926

Title:
Network issues without any kind of visible dropped packages

Status in linux package in Ubuntu:
New

Bug description:
Hi there,

we upgraded some of our 22.04er VMs this week and encounter some weird
network issues.

We couldn't find any dropped packages or other "visible" signs.

After a while of try and error with ping, mtr and traceroute we
realized curl was behaving "weirdly"

After a reboot we were able to run e.g. `curl -I www.google.com`
exactly once successfully and after that curl "hang" for a while, then
it worked for a short while and hang again.

To ping a destination always worked and was not flaky at all, so we
assume it could be something with http?

We found this:
https://www.ubuntuupdates.org/package/core/jammy/main/updates/linux-tools-5.15.0-173-generic

We read that "apparmor: fix memory leak in verify_header" so on a
hunch we downgraded to linux-image-5.15.0-171-generic from linux-
image-5.15.0-173-generic and all network issues disappeared.

I hope this is any helpful


p.s I wasn't able to chose the package name so I chose "I don't know", but it has to do with linux-image-5.15.0-173-generic

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.15.0-173-generic 5.15.0-173.183
ProcVersionSignature: Ubuntu 5.15.0-173.183-generic 5.15.198
Uname: Linux 5.15.0-173-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Mar 16 06:32 seq
crw-rw---- 1 root audio 116, 33 Mar 16 06:32 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu82.10
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: hetzner
CloudName: hetzner
CloudPlatform: hetzner
CloudSubPlatform: unknown
Date: Thu Mar 19 08:50:01 2026
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd QEMU USB Tablet
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Lsusb-t:
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
|__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 480M
MachineType: Hetzner vServer
PciMultimedia:

ProcFB: 0 virtio_gpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-173-generic root=UUID=be1e37b2-1f27-4d9f-8cc5-c947b721042d ro consoleblank=0 systemd.show_status=true console=tty1 console=ttyS0
RelatedPackageVersions:
linux-restricted-modules-5.15.0-173-generic N/A
linux-backports-modules-5.15.0-173-generic N/A
linux-firmware 20220329.git681281e4-0ubuntu3.41
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/11/2017
dmi.bios.release: 1.0
dmi.bios.vendor: Hetzner
dmi.bios.version: 20171111
dmi.board.name: Standard PC (Q35 + ICH9, 2009)
dmi.board.vendor: KVM
dmi.board.version: pc-q35-6.2
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: NotSpecified
dmi.modalias: dmi:bvnHetzner:bvr20171111:bd11/11/2017:br1.0:svnHetzner:pnvServer:pvr20171111:rvnKVM:rnStandardPC(Q35+ICH9,2009):rvrpc-q35-6.2:cvnQEMU:ct1:cvrNotSpecified:skuTM:
dmi.product.family: Hetzner_vServer
dmi.product.name: vServer
dmi.product.sku: TM
dmi.product.version: 20171111
dmi.sys.vendor: Hetzner

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