Re: 4.17.x won't boot due to "x86/boot/compressed/64: Handle 5-level paging boot if kernel is above 4G"

[Kirill A. Shutemov]

On Sun, Jul 01, 2018 at 09:32:43PM +0000, Benjamin Gilbert wrote:
> On Sun, Jul 01, 2018 at 05:15:59PM -0400, Benjamin Gilbert wrote:
> > 4.17 kernels built with the CoreOS Container Linux toolchain and kconfig, 
> > up to and including 4.17.3, fail to boot on AMD64 running in (at least) 
> > QEMU/KVM.  No messages are shown post-GRUB; the VM instantly reboots.  
> > Reverting commit 194a9749c73d ("x86/boot/compressed/64: Handle 5-level 
> > paging boot if kernel is above 4G") fixes it.  I've attached our kernel 
> > config for reference, and am happy to test patches, provide sample QCOW 
> > images, etc.
> 
> Adding linux-x86_64, LKML.

Thank you for the report.

I'm not able to trigger it in my environment. Tried v4.17.3 and current
Linus' tree.

I had to change config slightly to get kernel build in my setup. Diff is
below.

I run KVM this way:

qemu-system-x86_64 -kernel ./arch/x86/boot/bzImage -nographic -append "console=ttyS0"

Could you check if you can trigger the issue with my changes to config and
the way I run KVM?

If not, what the key difference in our setups that make the issue visible?

How do you run KVM? Do you have EFI enable? Config difference?
Running kernel directly, without GRUB makes a difference?

--- config	2018-07-02 11:59:23.662685761 +0300
+++ .config	2018-07-02 12:09:51.822677398 +0300
@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86 4.17.3-coreos Kernel Configuration
+# Linux/x86 4.17.3 Kernel Configuration
 #
 CONFIG_64BIT=y
 CONFIG_X86_64=y
@@ -187,16 +187,13 @@
 # CONFIG_SYSFS_DEPRECATED is not set
 CONFIG_RELAY=y
 CONFIG_BLK_DEV_INITRD=y
-CONFIG_INITRAMFS_SOURCE="bootengine.cpio"
-CONFIG_INITRAMFS_ROOT_UID=0
-CONFIG_INITRAMFS_ROOT_GID=0
+CONFIG_INITRAMFS_SOURCE=""
 CONFIG_RD_GZIP=y
 CONFIG_RD_BZIP2=y
 CONFIG_RD_LZMA=y
 CONFIG_RD_XZ=y
 CONFIG_RD_LZO=y
 CONFIG_RD_LZ4=y
-CONFIG_INITRAMFS_COMPRESSION=".gz"
 CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y
 # CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
 CONFIG_SYSCTL=y
@@ -1564,8 +1561,7 @@
 CONFIG_STANDALONE=y
 CONFIG_PREVENT_FIRMWARE_BUILD=y
 CONFIG_FW_LOADER=y
-CONFIG_EXTRA_FIRMWARE="intel-ucode/0f-04-04 intel-ucode/06-55-03 intel-ucode/06-1d-01 intel-ucode/06-9e-09 intel-ucode/06-05-03 intel-ucode/0f-02-09 intel-ucode/06-56-02 intel-ucode/0f-04-01 intel-ucode/06-03-02 intel-ucode/06-3e-06 intel-ucode/06-0e-0c intel-ucode/0f-04-0a intel-ucode/06-25-05 intel-ucode/06-56-03 intel-ucode/06-0f-0a intel-ucode/06-0f-0d intel-ucode/0f-03-04 intel-ucode/06-2d-07 intel-ucode/06-3d-04 intel-ucode/06-0f-02 intel-ucode/06-05-00 intel-ucode/0f-04-03 intel-ucode/06-47-01 intel-ucode/.keep_sys-firmware_intel-microcode-0 intel-ucode/06-07-02 intel-ucode/06-0a-00 intel-ucode/06-9e-0a intel-ucode/06-56-05 intel-ucode/06-1c-0a intel-ucode/06-05-02 intel-ucode/06-2d-06 intel-ucode/06-08-01 intel-ucode/06-06-0d intel-ucode/06-46-01 intel-ucode/06-0f-06 intel-ucode/06-0b-01 intel-ucode/06-45-01 intel-ucode/0f-04-09 intel-ucode/0f-06-02 intel-ucode/0f-04-07 intel-ucode/06-16-01 intel-ucode/06-5e-03 intel-ucode/06-06-05 intel-ucode/06-08-06 intel-ucode/0f-00-07 intel-ucode/06-07-01 intel-ucode/06-3e-07 intel-ucode/06-1c-02 intel-ucode/06-08-0a intel-ucode/0f-03-02 intel-ucode/06-07-03 intel-ucode/0f-02-07 intel-ucode/06-56-04 intel-ucode/06-2a-07 intel-ucode/06-17-06 intel-ucode/06-3e-04 intel-ucode/0f-02-05 intel-ucode/06-06-0a intel-ucode/06-3f-04 intel-ucode/06-25-02 intel-ucode/0f-01-02 intel-ucode/06-0b-04 intel-ucode/0f-04-08 intel-ucode/06-09-05 intel-ucode/06-2f-02 intel-ucode/06-4f-01 intel-ucode/06-3f-02 intel-ucode/06-3c-03 intel-ucode/06-7a-01 intel-ucode/0f-02-06 intel-ucode/06-1a-05 intel-ucode/06-26-01 intel-ucode/06-0f-07 intel-ucode/06-0d-06 intel-ucode/0f-03-03 intel-ucode/06-9e-0b intel-ucode/06-05-01 intel-ucode/06-0a-01 intel-ucode/06-4e-03 intel-ucode/06-8e-09 intel-ucode/06-1a-04 intel-ucode/06-5c-09 intel-ucode/0f-00-0a intel-ucode/0f-06-05 intel-ucode/0f-06-08 intel-ucode/06-08-03 intel-ucode/06-55-04 intel-ucode/06-0f-0b intel-ucode/06-1e-05 intel-ucode/06-0e-08 intel-ucode/06-3a-09 intel-ucode/06-17-07 intel-ucode/06-06-00 intel-ucode/06-8e-0a intel-ucode/0f-02-04 i
ntel-ucode/06-17-0a intel-ucode/0f-06-04 amd-ucode/microcode_amd.bin amd-ucode/microcode_amd_fam17h.bin amd-ucode/microcode_amd_fam16h.bin amd-ucode/microcode_amd_fam15h.bin "
-CONFIG_EXTRA_FIRMWARE_DIR="/build/amd64-usr/lib/firmware"
+CONFIG_EXTRA_FIRMWARE=""
 CONFIG_FW_LOADER_USER_HELPER=y
 # CONFIG_FW_LOADER_USER_HELPER_FALLBACK is not set
 CONFIG_ALLOW_DEV_COREDUMP=y
@@ -4742,7 +4738,7 @@
 #
 # Certificates for signature checking
 #
-CONFIG_MODULE_SIG_KEY="certs/modules.pem"
+CONFIG_MODULE_SIG_KEY="certs/signing_key.pem"
 CONFIG_SYSTEM_TRUSTED_KEYRING=y
 CONFIG_SYSTEM_TRUSTED_KEYS=""
 # CONFIG_SYSTEM_EXTRA_CERTIFICATE is not set
-- 
 Kirill A. Shutemov