Bug 850199

Summary:	sys-kernel/gentoo-sources-5.4.197: switch_root: failed to execute /sbin/init: Exec format error
Product:	Gentoo Linux	Reporter:	Michał Górny <mgorny>
Component:	Current packages	Assignee:	Distribution Kernel Project <dist-kernel>
Status:	RESOLVED INVALID
Severity:	normal	CC:	dist-kernel, sam
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Michał Górny archtester

2022-06-07 03:27:48 UTC

While testing 5.4.197, I've noticed that it fails to boot our test image (the process is found in kernel-install.eclass).  The boot fails with:

  switch_root: failed to execute /sbin/init: Exec format error

Following sam's suggestion I've attempted to revert the following commit:

https://github.com/gregkh/linux/commit/1fe82bfd9e4ce93399d815ca458b58505191c3e8

  commit 1fe82bfd9e4ce93399d815ca458b58505191c3e8
  Author: Kees Cook <keescook@chromium.org>
  Date:   Mon Jan 31 16:09:47 2022 -0800

      exec: Force single empty string when argv is empty

After reverting it, the kernel booted successfully.

Comment 1 Michał Górny archtester

2022-06-07 04:32:28 UTC

I'm sorry, it seems to have been an unfortunate quirk that just happened simultaneously in all builds.  After retrying, both amd64 and x86 pass without the revert.

Comment 2 Mike Pagano gentoo-dev

2022-06-07 10:27:58 UTC

Reassigning properly so that it can be found more easily if someone else stumbles upon this during the dist-kernel process since it is not a gentoo-sources issue.