*** This bug is a duplicate of bug 1977919 ***
https://bugs.launchpad.net/bugs/1977919
** This bug has been marked a duplicate of bug 1977919
Docker container creation causes kernel oops on linux-aws
5.13.0.1028.31~20.04.22
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https://bugs.launchpad.net/bugs/1977973
Title:
docker using overlayfs triggers kernel bug in fput
Status in linux-signed-gcp-5.13 package in Ubuntu:
New
Bug description:
Running a Google Cloud e2-medium VM using Ubuntu 20.04.4 LTS, I can
reliably trigger a kernel bug (invalid opcode) by simply starting a
Docker container when using the overlayfs (overlay2) storage driver.
## Repro
* spin up a GCP e2-medium machine using Ubuntu 20.04
* ensure the running kernel is 5.13.0-1030-gcp
* install Docker Engine á la https://docs.docker.com/engine/install/ubuntu/
* run `docker run -t python:3.9`
* type a few lines or whatever into the Python REPL
* exit the container with ctrl+d (on occasion, this isn't necessary either)
* kernel bug (SSH hangs, machine reboots)
The kernel bug dump, as shown via the Google Cloud Console's serial
dump, is attached.
## Workarounds
* If you change the Docker storage driver to `vfs` and retry, the bug
reliably is not triggered.
* If you downgrade to kernel 5.13.0-1027-gcp, the bug is not triggered.
## Other
I read the diff between 1027..1030 and I have the feeling
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1967924 is
related to this issue, since it adds an `fput` invocation and is
related to overlayfs.
Since this appears to be a DoS vector, out of caution I've marked this
a security vulnerability.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.13.0-1030-gcp 5.13.0-1030.36~20.04.1
ProcVersionSignature: Ubuntu 5.13.0-1030.36~20.04.1-gcp 5.13.19
Uname: Linux 5.13.0-1030-gcp x86_64
ApportVersion: 2.20.11-0ubuntu27.24
Architecture: amd64
CasperMD5CheckResult: skip
Date: Wed Jun 8 11:17:16 2022
ProcEnviron:
LC_CTYPE=UTF-8
TERM=xterm-256color
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
SourcePackage: linux-signed-gcp-5.13
UpgradeStatus: No upgrade log present (probably fresh install)
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