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SubjectRe: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit 3448890c32c3
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On 06/01/2017 11:39 AM, Larry Finger wrote:
> On my Powerbook G4 aluminum, kernel 4.12-rc1 fails to boot. I cannot save a copy
> of the early printk messages and I will need to summarize.
>
> The kernel finds the hard driver and recognizes the various partitions. All
> seems normal until after the "unused kernel memory is freed" and that "This
> architecture does not have kernel memory protection", which are both normal. The
> next batch of logged messages are
>
> Loading, please wait...
> udevd[64]: starting version 175
> udevd[64]: Unable to receive ctrl message: Bad address.
> modprobe: chdir(4.12-rc1): No such file or directory
> udevd[64]: Unable to receive ctrl message: Bad address.
> Begin: Loading essential drivers ... modprobe: chdir: chdir(4.12.0-rc1): No such
> file or directory
> done.
> Begin: Running /scripts/init-premount ... done.
> udevd[64]: Begin: Waiting for root file system ... [ 11.651175] random: faast
> init done
> done.
> Gave up waiting for root device. Common problems:
> - Boot args (cat /proc/cmdline)
> - Check rootdelay= (did the system wait long enough?)
> - Check root= (Did the system wait for the right device?)
> - Missing modules (cat /proc/modules; ls /dev)
> ALERT! /dev/disk/by-uuid/<UUID> does not exist. Dropping to a shell!
> modprobe: chdir(4.12-rc1): No such file or directory <listed 6 times>
>
> BusyBox v1.20.2 (Debian 1:1.20.0-7) built-in shell (ash)
> Enter 'help' for a list of built-in commands.
>
> /bin/sh: can't access tty: Job control turned off
> (initramfs)
>
> At that point, the system is dead. I have tried bisecting this issue; however, I
> run into a second problem that crashes the bootstrap.

I finally finished the bisection by patching each commit that was affected by
the bootstrap crash. The faulty change is commit
3448890c32c32c482c3ec20baa8fdd2ab4f94cc0 ("powerpc: get rid of zeroing, switch
to RAW_COPY_USER"). I am very confident in the bisection.

As I know nothing of assembly for ppc32, I have not been able to attempt to find
the problem with these patches.

Larry


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