linux-kernel - Re: kexec reboot failed due to commit 75d090fd167ac

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Message-ID: <20230907131409.masxz42ik6u456qp@box.shutemov.name>
Date:   Thu, 7 Sep 2023 16:14:09 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Aaron Lu <aaron.lu@...el.com>
Cc:     Bagas Sanjaya <bagasdotme@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>
Subject: Re: kexec reboot failed due to commit 75d090fd167ac

On Tue, Aug 29, 2023 at 10:04:51PM +0800, Aaron Lu wrote:
> > Could you show dmesg of the first kernel before kexec?
> 
> Attached.
> 
> BTW, kexec is invoked like this:
> kver=6.4.0-rc5-00009-g75d090fd167a
> kdir=$HOME/kernels/$kver
> sudo kexec -l $kdir/vmlinuz-$kver --initrd=$kdir/initramfs-$kver.img --append="root=UUID=4381321e-e01e-455a-9d46-5e8c4c5b2d02 ro net.ifnames=0 acpi_rsdp=0x728e8014 no_hash_pointers sched_verbose selinux=0"

I don't understand why it happens.

Could you check if this patch changes anything:

diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 94b7abcf624b..172c476ff6f3 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -456,10 +456,12 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap,
 
 	debug_putstr("\nDecompressing Linux... ");
 
+#if 0
 	if (init_unaccepted_memory()) {
 		debug_putstr("Accepting memory... ");
 		accept_memory(__pa(output), __pa(output) + needed_size);
 	}
+#endif
 
 	__decompress(input_data, input_len, NULL, NULL, output, output_len,
 			NULL, error);
-- 
  Kiryl Shutsemau / Kirill A. Shutemov