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

[msizanoen]

Submitted for review: 
https://lore.kernel.org/stable/20250405-fix-e820-nosave-v1-1-162633199548@xxxxxxxxxxx/

On 4/4/25 12:50, msizanoen wrote:
> Here's an updated version of the patch that better handles 
> pathological e820 tables.
>
> On 4/4/25 11:56, msizanoen wrote:
> > Also, can you reproduce this issue with a target kernel (the kernel 
> > being kexec-ed) that has one of the patches attached (select the 
> > correct one according to your kernel version) applied, with either 
> > kexec_load or kexec_file_load?
> >
> > On 4/4/25 09:54, msizanoen wrote:
> > > Can you send the dmesg logs for this case (6.13 + mentioned patch 
> > > series backported as target kernel, using kexec_load)?
> > >
> > > On 4/4/25 05:00, Roberto Ricci wrote:
> > > > On 2025-04-01 19:59 +0700, msizanoen wrote:
> > > > > [snip]
> > > > > It seems like `e820__register_nosave_regions` is erroneously 
> > > > > marking some
> > > > > kernel memory as nosave in the presence of sub-page e820 regions. 
> > > > > In theory
> > > > > backporting
> > > > > https://lore.kernel.org/all/20250214090651.3331663-1-rppt@xxxxxxxxxx/ 
> > > > > should
> > > > > be sufficient to avoid this but a fix for the actual root cause is
> > > > > preferred.
> > > > When using kexec_file_load, this patch series fixes the issue not only
> > > > in theory but also in practice.
> > > > But the issue with kexec_load (see
> > > > https://lore.kernel.org/all/Z-hYWc9LtBU1Yhtg@desktop0a/
> > > > ), which might be related, is not fixed.