This is the debdiff containing the proposed solution for this LP.
I'd like to thanks specially Cascardo and Heitor for the fruitful discussions
with regards the direction we should take in this LP.
** Changed in: makedumpfile (Ubuntu Cosmic)
Status: In Progress => Confirmed
** Changed in: makedumpfile (Ubuntu Eoan)
Status: Confirmed => In Progress
** Changed in: makedumpfile (Ubuntu Bionic)
Status: In Progress => Confirmed
** Patch added: "lp1800562_eoan.debdiff"
https://bugs.launchpad.net/ubuntu/bionic/+source/makedumpfile/+bug/1800562/+attachment/5275119/+files/lp1800562_eoan.debdiff
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https://bugs.launchpad.net/bugs/1800562
Title:
Remove obsolete "nousb" option in kdump command-line for newer kernels
Status in makedumpfile package in Ubuntu:
In Progress
Status in makedumpfile source package in Xenial:
Won't Fix
Status in makedumpfile source package in Bionic:
Confirmed
Status in makedumpfile source package in Cosmic:
Confirmed
Status in makedumpfile source package in Disco:
Confirmed
Status in makedumpfile source package in Eoan:
In Progress
Bug description:
[Impact]
* Kdump command-line include an obsolete "nousb" parameter by default, which
can cause a misimpression: users will think they are not booting with USB, but
they are.
* Since kernel v4.5, the correct parameter to disable USB subsystem
initialization is "usbcore.nousb" always (instead of "nousb" in case
the subsystem is built-in). This was changed by commit 097a9ea0e48
("usb: make "nousb" a clear module parameter").
* USB may be pretty essential in case for example kdump users need to
decrypt a disk under LUKS, and there's only an USB keyboard connected
to the system. Given the option is innocuous since Bionic, we should
just drop it to prevent confusion.
[Test Case]
1) Deploy a Disco VM e.g. with uvt-kvm
2) Install the kdump-tools package
3) Run `kdump-config test`and check for the 'nousb' parameter:
$ kdump-config test
...
kexec command to be used:
/sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-4.15.0-45-generic
root=LABEL=cloudimg-rootfs ro console=tty1 console=ttyS0 nr_cpus=1
systemd.unit=kdump-tools.service irqpoll nousb ata_piix.prefer_ms_hyperv=0"
/var/lib/kdump/vmlinuz
[Regression Potential]
The regression potential is extremely low, since the "nousb" parameter
is not used since Bionic although is there. Any bugs we would have by
changing this are still valid by not removing the option - the
semantics with or without "nosub" is the same since from Bionic.
NOTICE we won't change Xenial, it can use kernel 4.4 which indeed
disables USB by taking the "nousb" parameter.
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