linux-kernel - Re: linux-next: boot failure after merge of the memblock tree

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Message-ID: <20241029072039.39d850dc@canb.auug.org.au>
Date: Tue, 29 Oct 2024 07:20:39 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Mike Rapoport <rppt@...nel.org>
Cc: Su Hua <suhua.tanke@...il.com>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: Re: linux-next: boot failure after merge of the memblock tree

Hi all,

On Sat, 26 Oct 2024 07:36:13 +0800 Su Hua <suhua.tanke@...il.com> wrote:
>
> Mike Rapoport <rppt@...nel.org> 于2024年10月25日周五 16:46写道：
> >
> > On Fri, Oct 25, 2024 at 04:33:16PM +0800, Su Hua wrote:  
> > > Su Hua <suhua.tanke@...il.com> 于2024年10月25日周五 16:19写道：  
> > > >
> > > > Appreciate everyone.
> > > >
> > > > Mike Rapoport <rppt@...nel.org> 于2024年10月25日周五 14:57写道：  
> > > > >
> > > > > Hi Stephen,
> > > > >
> > > > > On Tue, Oct 22, 2024 at 05:39:21PM +1100, Stephen Rothwell wrote:  
> > > > > > Hi all,
> > > > > >
> > > > > > After merging the memblock tree, today's linux-next build
> > > > > > (powerpc_pseries_le_defconfig) failed my qemu boot test like this:
> > > > > >
> > > > > > Kernel panic - not syncing: Attempted to kill the idle task!
> > > > > >
> > > > > > Caused by commit
> > > > > >
> > > > > >   ad48825232a9 ("memblock: uniformly initialize all reserved pages to MIGRATE_MOVABLE")
> > > > > >
> > > > > > I bisected the failure to this commit and have reverted it for today.  
> > > > >
> > > > > Apparently set_pfnblock_flags_mask() is unhappy when called for
> > > > > uninitialized struct page. With the patch below
> > > > >
> > > > > qemu-system-ppc64el -M pseries -cpu power10 -smp 16 -m 32G -vga none -nographic -kernel $KERNEL
> > > > >
> > > > > boots up to mounting root filesystem.
> > > > >
> > > > > diff --git a/mm/mm_init.c b/mm/mm_init.c
> > > > > index 49dbd30e71ad..2395970314e7 100644
> > > > > --- a/mm/mm_init.c
> > > > > +++ b/mm/mm_init.c
> > > > > @@ -723,10 +723,10 @@ static void __meminit init_reserved_page(unsigned long pfn, int nid)
> > > > >                         break;
> > > > >         }
> > > > >
> > > > > +       __init_single_page(pfn_to_page(pfn), pfn, zid, nid);
> > > > > +
> > > > >         if (pageblock_aligned(pfn))
> > > > >                 set_pageblock_migratetype(pfn_to_page(pfn), MIGRATE_MOVABLE);
> > > > > -
> > > > > -       __init_single_page(pfn_to_page(pfn), pfn, zid, nid);  
> > > >
> > > > Indeed, when #ifdef NODE_NOT_IN_PAGE_FLAGS is defined, there is no
> > > > problem, and this is why my
> > > > test environment did not reveal any issues. However, when
> > > > NODE_NOT_IN_PAGE_FLAGS is not defined,
> > > > page_to_nid needs to use page->flags to get the node ID, which depends
> > > > on __init_single_page for initialization.  
> > >
> > > Hi Mike
> > > Could you please advise whether the fix for this issue should be
> > > submitted by you or me
> > > as a new patch, or should I submit a patch that adjusts the code
> > > position, just like this:  
> >
> > I've folded the update into your original commit, it's now in for-next
> > branch of memblock tree  
> 
> Okay, thank you.
> 
> > > diff --git a/mm/mm_init.c b/mm/mm_init.c
> > > index 4ba5607aaf19..5a8114fb02ae 100644
> > > --- a/mm/mm_init.c
> > > +++ b/mm/mm_init.c
> > > @@ -723,6 +723,9 @@ static void __meminit init_reserved_page(unsigned
> > > long pfn, int nid)
> > >                         break;
> > >         }
> > >         __init_single_page(pfn_to_page(pfn), pfn, zid, nid);
> > > +
> > > +       if (pageblock_aligned(pfn))
> > > +               set_pageblock_migratetype(pfn_to_page(pfn), MIGRATE_MOVABLE);
> > >  }
> > >  #else

This has returned, so I applied by hand the above discussed fix.

-- 
Cheers,
Stephen Rothwell

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