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On Sun, Jun 12, 2022 at 05:05:35PM -0400, Demi Marie Obenour wrote:
> On Sun, Jun 12, 2022 at 02:57:49AM -0700, Peter Palensky wrote:
> >
> >
> > On Saturday, June 11, 2022 at 7:21:20 PM UTC+2 Demi Marie Obenour wrote:
> >
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> > > On Sat, Jun 11, 2022 at 03:00:09AM -0700, Peter Palensky wrote:
> > > >
> > > > On Saturday, June 11, 2022 at 1:09:47 AM UTC+2 [email protected] wrote:
> > > >
> > > > > > Which kernel version do you need to hold? You can update a subset
> > > > > > of
> > > > > > packages by giving them as arguments to qubes-dom0-update, but I
> > > would
> > > > > > like to know what the forseeable problems are.
> > > > >
> > > > > The reason is simple: all (!) 5.x xen kernels I tested so far
> > > > > crash/freeze my system in less than 5 minutes, often only seconds
> > > (open
> > > > > issue on github since 18 months). Therefore I keep a 4.19 kernel for
> > > xen
> > > > > (only) -- until now the updater respected that: it installed some new
> > > > > 5.x kernel and kernel-latest. Every single time, I bravely try them
> > > out,
> > > > > and each time they crash: each time I can revert back to 4.19 by a
> > > > > linux-life usb hack.
> > > > >
> > > > > Last kernel update wants to remove my 4.19 kernel, and no way I can
> > > > > accept that, given the history. ( again a curse on Intel and Dell for
> > > > > their buggy hardware ).
> > > > >
> > > > > best, Bernhard
> > > > >
> > > > >
> > > > Same here (Dell XPS13). The only usable dom0 kernels are 4.x and 5.4.88
> > > > (already gone :-0) and 5.4.175 (please let me keep that!).
There are a couple more options to choose from - for LTS kernels we keep
some of them updated, even after the default is switched to the next
one. For R4.0 there is for example kernel-419. You can check available
options via `qubes-dom0-update --action=search kernel`.
> > > > Everything else either crashes dom0 (e.g., 5.15) or stalls sys-usb
> > > > (e.g.
> > > > 5.12.).
> > > >
> > > > It says "00:14.0 USB controller problem", might be a usb3.0 problem,
> > > tried
> > > > various things, nothing helped, my BIOS has no option to disable xHCI.
> > >
> > > I am hesitant to ask, since it would require running unsigned code
> > > (yuck!), but would you be comfortable doing a kernel git bisection?
> > > That would allow figuring out exactly which commit caused the problem,
> > > and would vastly improve the likelihood of the bug being fixed.
> >
> > Aaehm... It is my work computer, i need it every day and can not risk
> > anything...
> > Is there a safe/standard procedure in qubes to compile the bisects, add
> > them to grub without removing the working kernel, etc.?
>
> Not that I am aware of, sadly. Marek (CCd) might have suggestions.
For any tests, I usually place kernel+initramfs under some arbitrary
name that does not interfere with version-based entries. And do that by
installing kernel "manually", exactly to avoid dnf/rpm removing older
packages. For the grub entry, I usually edit
/boot/efi/EFI/qubes/grub.cfg manually (copy existing section and just
replace file names). But regenerating it with grub2-mkconfig should be
safe too.
This does require manual cleaning after testing is finished,
though...
Here is example script to build and install kernel in dom0:
#!/bin/sh
set -e
make olddefconfig
make -j2
kver=$(make kernelrelease)
sudo make modules_install
sudo cp arch/x86/boot/bzImage /boot/vmlinuz-test
sudo dracut -f --kver="$kver" /boot/initramfs-test.img
it can be launched from kernel sources.
- --
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
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