On Fri, Nov 4, 2022 at 6:30 AM Sven Schwermer <[email protected]> wrote:
> Hi,
>
> We're in the process of migrating from dunfell to kirkstone and noticed
> a regression with the Linux kernel (branch: v5.15/standard/base). The
> boot panics with
>
> [ 1.038015] Kernel panic - not syncing: /dev/console is missing!
> [ 1.038015] Please ensure your rootfs is properly configured
>
> I have bisected the revisions between the good dunfell one and the bad
> kirkstone one and the offending commit is:
>
> 0d7260ad7106 check console device file on fs when booting
>
>
the commit itself hasn't changed between those releases and kernel
versions, so it very well could be something else in the kernel or in
the generation of the rootfs that is now triggering the commit to change.
The logic for the change is documented in the patch itself. We were
getting a lot (5 or more a week) questions (and blaming of the
kernel) when badly created rootfs were being booted. They all had
mangled /dev/console devices, and fixing that, fixed the boot. It was
much easier to just check and fail with a clearer message than the
other issues that happen down the boot process and that are much
more cryptic to debug.
> The weird thing is that vfs_lstat() fails while the subsequent
> filp_open() in on the same file succeeds. I'm booting without
> initramfs/initrd and with automounted devtmpfs:
>
> CONFIG_DEVTMPFS=y
> CONFIG_DEVTMPFS_MOUNT=y
> # CONFIG_BLK_DEV_INITRD is not set
>
> Since this commit is not part of upstream Linux, I thought I'd ask for
> help here. What's the purpose of this extra check and why is it failing
> even though /dev/console exists (filp_open("dev/console") works)?
>
That same check isn't failing in anything I've run, or the release process
has run (but a non initrd boot isn't as common, so it isn't impossible that
something slipped through).
If there's a set of public layers that I can use to reproduce the problem,
I can have a closer look. But it will be just me digging into the vfs_lstat
call to see if we are now misinterpreting the return from the routine, etc.
Bruce
>
> Best regards,
> Sven
>
--
- Thou shalt not follow the NULL pointer, for chaos and madness await thee
at its end
- "Use the force Harry" - Gandalf, Star Trek II
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