Git repository at 'git://git.launchpad.net/~timg-
tpi/ubuntu/+source/linux/+git/focal focal-azure-opensnoop'. The kernel
built using these sources worked correctly.

** Description changed:

  SRU Justification
  
  [Impact]
  
  The actual kernel used on AKS arm64 (i.e. 5.4.1089) suffers from a known 
problem
  [1].
  As a consequence, opensnoop does not display PATH:
  # Run the following from 
Canonical:UbuntuServer:18_04-daily-lts-arm64:18.04.202208290
  $ uname -a
  Linux francis-vm-arm64-ubuntu18vm 5.4.0-1089-azure #94~18.04.1-Ubuntu SMP Fri 
Aug 5 12:36:48 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux
  $ lsb_release -rd
  Description: Ubuntu 18.04.6 LTS
  Release: 18.04
  $ git clone --recurse-submodules https://github.com/iovisor/bcc
  Linux francis-vm-arm64-ubuntu18vm 5.4.0-1089-azure #94~18.04.1-Ubuntu SMP Fri 
Aug 5 12:36:48 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux
  $ sudo sh -c 'apt update && apt install -qy clang-10 llvm-10 make gcc 
pkg-config libelf-dev libz-dev'
  ...
  $ cd bcc/libbpf-tools
  $ CLANG=clang-10 LLVM_STRIP=llvm-strip-10 make -j opensnoop
  ...
  BINARY opensnoop
  $ sudo ./opensnoop
  PID COMM FD ERR PATH
  1672 python3 3 0
  9746 opensnoop 20 0
  1672 python3 3 0
  1672 python3 3 0
  1672 python3 -1 2
  1672 python3 3 0
  1 systemd 18 0
  1672 python3 6 0
  1672 python3 3 0
  1672 python3 3 0
  1672 python3 3 0
  1672 python3 3 0
  1672 python3 3 0
  ^C
  As you can see, nothing is printed for the PATH while normal behavior prints 
the
  path of the opened file:
  $ uname -a
  Linux pwmachine 5.15.0-46-generic #49~20.04.1-Ubuntu SMP Thu Aug 4 19:15:44 
UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
  $ sudo ./opensnoop
  PID COMM FD ERR PATH
  2704 systemd 23 0 virtual
  2704 systemd 22 0 misc
  2704 systemd 23 0 fuse
  2704 systemd 22 0 /sys/devices/virtual/misc/fuse/uevent
  2704 systemd 22 0 /run/udev/data/c10:229
  2704 systemd 22 0 /proc/2704/status
  2704 systemd 22 0 /proc/2704/status
  2704 systemd 22 0 /proc/2704/status
  ^C
  
  This bug was fixed in upstream patch [2]
  Sadly, this patch was not back ported, so it is not present in stable kernels.
  
  [Test plan]
  
  Follow the above instructions
  
  [Where things could go wrong]
  
  Unknown
+ 
+ [Other Info]
+ 
+ Original RFC at https://lists.ubuntu.com/archives/kernel-
+ team/2022-September/133038.html

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-azure in Ubuntu.
https://bugs.launchpad.net/bugs/1990009

Title:
  Azure: Focal 5.4 kernel eBPF opensnoop does not display PATH

Status in linux-azure package in Ubuntu:
  Fix Released
Status in linux-azure source package in Focal:
  In Progress

Bug description:
  SRU Justification

  [Impact]

  The actual kernel used on AKS arm64 (i.e. 5.4.1089) suffers from a known 
problem
  [1].
  As a consequence, opensnoop does not display PATH:
  # Run the following from 
Canonical:UbuntuServer:18_04-daily-lts-arm64:18.04.202208290
  $ uname -a
  Linux francis-vm-arm64-ubuntu18vm 5.4.0-1089-azure #94~18.04.1-Ubuntu SMP Fri 
Aug 5 12:36:48 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux
  $ lsb_release -rd
  Description: Ubuntu 18.04.6 LTS
  Release: 18.04
  $ git clone --recurse-submodules https://github.com/iovisor/bcc
  Linux francis-vm-arm64-ubuntu18vm 5.4.0-1089-azure #94~18.04.1-Ubuntu SMP Fri 
Aug 5 12:36:48 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux
  $ sudo sh -c 'apt update && apt install -qy clang-10 llvm-10 make gcc 
pkg-config libelf-dev libz-dev'
  ...
  $ cd bcc/libbpf-tools
  $ CLANG=clang-10 LLVM_STRIP=llvm-strip-10 make -j opensnoop
  ...
  BINARY opensnoop
  $ sudo ./opensnoop
  PID COMM FD ERR PATH
  1672 python3 3 0
  9746 opensnoop 20 0
  1672 python3 3 0
  1672 python3 3 0
  1672 python3 -1 2
  1672 python3 3 0
  1 systemd 18 0
  1672 python3 6 0
  1672 python3 3 0
  1672 python3 3 0
  1672 python3 3 0
  1672 python3 3 0
  1672 python3 3 0
  ^C
  As you can see, nothing is printed for the PATH while normal behavior prints 
the
  path of the opened file:
  $ uname -a
  Linux pwmachine 5.15.0-46-generic #49~20.04.1-Ubuntu SMP Thu Aug 4 19:15:44 
UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
  $ sudo ./opensnoop
  PID COMM FD ERR PATH
  2704 systemd 23 0 virtual
  2704 systemd 22 0 misc
  2704 systemd 23 0 fuse
  2704 systemd 22 0 /sys/devices/virtual/misc/fuse/uevent
  2704 systemd 22 0 /run/udev/data/c10:229
  2704 systemd 22 0 /proc/2704/status
  2704 systemd 22 0 /proc/2704/status
  2704 systemd 22 0 /proc/2704/status
  ^C

  This bug was fixed in upstream patch [2]
  Sadly, this patch was not back ported, so it is not present in stable kernels.

  [Test plan]

  Follow the above instructions

  [Where things could go wrong]

  Unknown

  [Other Info]

  Original RFC at https://lists.ubuntu.com/archives/kernel-
  team/2022-September/133038.html

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1990009/+subscriptions


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