Messages in this thread | | | Subject | Re: Regression in kernel 4.12-rc1 for Powerpc 32 - bisected to commit 3448890c32c3 | From | Larry Finger <> | Date | Wed, 21 Jun 2017 10:10:57 -0500 |
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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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