linux-kernel - Re: [REGRESSION] Kernel booted via kexec fails to resume from hibernation

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Message-ID: <Z4Zjmva-pLbLjtQv@desktop0a>
Date: Tue, 14 Jan 2025 14:16:10 +0100
From: Roberto Ricci <io@...icci.it>
To: ebiederm@...ssion.com, rafael@...nel.org, pavel@....cz,
	ytcoode@...il.com
Cc: kexec@...ts.infradead.org, linux-pm@...r.kernel.org,
	akpm@...ux-foundation.org, regressions@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] Kernel booted via kexec fails to resume from
 hibernation

On 2025-01-13 Mon 22:28:48 +0100, Roberto Ricci wrote:
> I can reproduce this with kernel 6.13-rc7 in a qemu x86_64 virtual machine
> running Void Linux, with the following commands:
> 
> ```
> # kexec -l /boot/vmlinuz-6.13.0-rc7 --initrd=/boot/initramfs-6.13.0-rc7 --reuse-cmdline
> # reboot
> # printf reboot >/sys/power/disk
> # printf disk >/sys/power/state
> ```

Looks like it's the kernel performing the kexec which causes the issue,
not the target one. E.g.: kexec-ing 6.7 from 6.13-rc7 makes resume from
hibernation fail; but if I kexec 6.13-rc7 from 6.7, then it works fine.