13.0 failing to boot multiuser on one PC due to system utilities crashing during rc scipt

[Guido Falsi]

On 10/11/18 13:08, Guido Falsi wrote:
> Hi,
> 
> Today I was updating my home machines to recent head, r340303.
> Previously I was running r339449.
> 
> I have a build machine where I build base packages (and also runs
> poudriere). I updated that machine using packages I built successfully.
> it is running fine and also successfully rebuilt a full ports package
> set on the new head.
> 
> After that I upgraded, using the same package set, another machine, a PC
> from around three years ago with an i5. After upgrade the kernel boots
> fine but when running the rc script to go multiuser some system
> utilities fail, especially zfs, making it impossible for the machine to
> complete the boot process.
> 
> I have tested booting from the memstick snapshot images, I tested:
> 
> FreeBSD-13.0-CURRENT-amd64-20181107-r340239-memstick.img
> FreeBSD-13.0-CURRENT-amd64-20181101-r339979-memstick.img
> 
> and both are also failing to go multiuser. The utility failing in this
> case is fsck, which, like zfs before, dumps core.
> 
> I see a pattern where only disk related utilities crash.
> 
> The 12.0-BETA4 installation memstick works fine though.
> 
> So clearly something changed between r339449 and r340303 which causes
> incompatibility with my hardware.
> 
> I'll to bisect things, but it will be a slow process.

I narrowed it down to r339895.

I'm not sure why it fails, it goes beyond my knowledge, the change looks
unharmful, but clearly isn't.

My impression is that the other conditions not moved inside the ifunc
also play a role so such optimization is not possible on all systems.

> 
> I have put dmesg and pciconf output here in case it could be useful:
> 
> https://people.freebsd.org/~madpilot/boot_fail/

-- 
Guido Falsi <mad at madpilot.net>