R:200218/0605z @:K3CHB.#EPA.PA.USA.NOAM [Mechanicsburg, PA]
 [2.0m-B1FHIM$] #:22575 $:22573_K3CHB Z:17055

 >Marius Petrescu marius at yo2loj.ro
 >Tue Sep 17 15:23:33 EDT 2019

 Let me explain the patch so maybe you can do it yourself, since the
 code
 will probably not work on a 5.x kernel...

 The target function is ax25_disconnect(ax25_cb *ax25, int reason).

 The function is in the file ax25_subr.c in the 4.9 version.

 the last part is an:

 if (ax25- sk != NULL) {

 (...the ax25 socket is closed here...)

 }

 This if catches only full ax25 connections, not the ones associated
 with
 netrom connections.

 So for netrom connections, we also need a socket deletion, so add to
 this if the following else:

 else {

 ax25_destroy_socket(ax25)


 }

 Maybe this helps get you going...

 Marius, YO2LOJ
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

 BUILD GUIDE:
 LINUX KERNEL FROM SOURCE DEBIAN
 -------------------------------

 [0] Download build tools

 $ sudo apt install build-essential bison flex gnupg libncurses-dev
 libelf-dev libssl-dev wget


 [1] Import crypto signing keys belonging to kernel release developers


 $ gpg --locate-keys torvalds@kernel.org gregkh@kernel.org


 [2] Download to my home directory the latest stable kernel source and
 signature (5.3 as of 2019-09-22)

 $ mkdir ~/kernel
 $ cd ~/kernel
 $ wget https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.5.4.tar.xz
 $ wget
 https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.5.4.tar.sign


 [3] Verify

 $ unxz -c linux-5.5.4.tar.xz | gpg --verify linux-5.3.tar.sign -
 gpg: Signature made Mon 16 Sep 2019 02:01:09 AM EDT
 gpg:                using RSA key
 647F28654894E3BD457199BE38DBBDC86092693E
 gpg: Good signature from "Greg Kroah-Hartman <gregkh@kernel.org "
 [unknown]
 gpg: WARNING: This key is not certified with a trusted signature!
 gpg:          There is no indication that the signature belongs to the
 owner.
 Primary key fingerprint: 647F 2865 4894 E3BD 4571  99BE 38DB BDC8 6092
 693E


 [4] Unpack kernel

 $ tar xaf linux-5.5.4.tar.xz
 $ cd linux-5.5.4


 [5] Rather than configure everything from scratch, copy the
 /boot/config-VERSION of the kernel currently in use to the kernel s
 ource directory

 $ uname -r
 5.2.0-2-amd64
 $ cp /boot/config-5.5.4-amd64 ~/kernel/linux-5.4/.config


 [6] If anything needs to be modified in the configuration, bring up the

 configuration menu by running

 $ make nconfig
 Otherwise, when using a .config file that has been generated with
 another (older) kernel version, it needs to be updated with a
 ny changes that have been been made to the newer kernel. Running

 $ make oldconfig
    interactively asks questions relating to the new options.

 To preemptively accept the default answer to all those questions, run


 $ make olddefconfig


 [7] Modify the copied Debian kernel configuration and set

 CONFIG_SYSTEM_TRUSTED_KEYS = ""
    or the build fails with the error

 make[4]: *** No rule to make target
 'debian/certs/debian-uefi-certs.pem', needed by
 'certs/x509_certificate_list'.  Stop.


 [8] Optional: Skip building the linux-image-VERSION-dbg package which
 contains the debugging symbols for the kernel image and i
 ts modules. Not required unless debugging kernel code. Significant
 savings in compile time and space. Building binary packages for a
 single
 kernel flavour that includes *-dbg package requires upwards of 24GB of
 space in the package directory vs roughly 3
 -4GB without.

 To disable the build of *-dbg package, modify the configuration by
 setting

 CONFIG_DEBUG_INFO=n



 [9] Build the kernel (LOCALVERSION parameter appends custom text to the

 generated package name)

 $ make clean
 $ make deb-pkg LOCALVERSION=-custom


 [10] New packages

 $ ls ../*deb
 .../linux-headers-5.3.0-custom_5.5.4-custom-1_amd64.deb      # header
 files required to build external modules
 .../linux-image-5.3.0-custom_5.5.4-custom-1_amd64.deb        # kernel
 image and the associated modules
 .../linux-image-5.3.0-custom-dbg_5.5.4-custom-1_amd64.deb    # if
 CONFIG_DEBUG_INFO=y
 .../linux-libc-dev_5.5.4-custom-1_amd64.deb                  # headers
 relevant to some user-space libraries like GNU glibc
 Install

 $ sudo dpkg -i ../linux-image-5.5.4-custom_5.5.4-custom-1_amd64.deb
    which unpacks the kernel, generates the initrd, and configures the
 bootloader to make the new kernel the default one.



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