Upgrade 4.4.111-r1 to 4.4.150 does not boot on HyperV*SOLVED

Duncan Mac Leod · Guru Joined: 02 May 2004 Posts: 312 Location: Germany

I upgraded my kernel from 4.4.111-r1 to 4.4.150 and now I have problems to boot on Hyper-V -> it hangs, don't know why.

only difference is:

< # Linux/x86 4.4.111-gentoo-r1 Kernel Configuration
---
> # Linux/x86 4.4.150-gentoo Kernel Configuration
48d47
< CONFIG_ARCH_HWEIGHT_CFLAGS="-fcall-saved-ecx -fcall-saved-edx"
191a191
> CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y
383a384
> CONFIG_X86_FAST_FEATURE_TESTS=y
385a387
> CONFIG_RETPOLINE=y
1434a1437
> CONFIG_DST_CACHE=y
1460a1464
> CONFIG_GENERIC_CPU_VULNERABILITIES=y
2374a2379
> CONFIG_USB_NET_CDC_SUBSET_ENABLE=m
3033c3038
< # CONFIG_TCG_CRB is not set
---
> CONFIG_TCG_CRB=y
5464d5468
< # CONFIG_X86_DEBUG_STATIC_CPU_HAS is not set

Any ideas?

Naib · Posted: Sun Oct 14, 2018 6:34 pm Post subject:

do you have any out of kernel tree drivers? RAID cards for instance

The kernel has booted and has handed over to init so the question is... what else was updated? gcc ? what hasn't been rebuilt?
_________________

Duncan Mac Leod · Guru Joined: 02 May 2004 Posts: 312 Location: Germany

No, there are no out of kernel tree drivers.

Selecting the old kernel via Grub still boots the system without any problems.

Duncan Mac Leod · Guru Joined: 02 May 2004 Posts: 312 Location: Germany

CONFIG_RETPOLINE was the problem.

Recompiled with CONFIG_RETPOLINE not set -> works!

I assume if they gonna fix it upstream, it won't be backported to 4.4.x kernel tree.

Naib · Posted: Sun Oct 14, 2018 7:51 pm Post subject:

good its solved, that was teh one option I was going to say might be off.

I can't remember but repoline might have needed gcc update as well to work, hence the query about other updates. If this is for a HyperV you might want this though (depending on the guests and who uses them)
_________________

Duncan Mac Leod · Guru Joined: 02 May 2004 Posts: 312 Location: Germany

Found this googleling around: https://lore.kernel.org/patchwork/patch/872009/

and if I check the 4.4.161 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/x86/include/asm/mshyperv.h?h=v4.4.161
against the newest 4.18.14 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/x86/include/asm/mshyperv.h?h=v4.18.14
there is a lot of new code and it seems they have applied the provided patch.

IIRC the 4.4.x tree is on long term support til Feb 2022, so I hope that Greg will backport the missing Hyper-V support for RETPOLINE.
...and I hope that Gentoo will provide support for gentoo-sources-4.4.x too ..! :wink: