linux-kernel - Re: Machine check recovery broken in v6.9-rc1

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Date: Thu, 4 Apr 2024 16:39:53 -0700
From: Tony Luck <tony.luck@...el.com>
To: Borislav Petkov <bp@...en8.de>, Yazen Ghannam <yazen.ghannam@....com>,
	Miaohe Lin <linmiaohe@...wei.com>,
	Naoya Horiguchi <naoya.horiguchi@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: Machine check recovery broken in v6.9-rc1

On Thu, Apr 04, 2024 at 03:05:33PM -0700, Tony Luck wrote:
> v6.8 works. v6.9-rc1 fails with:
> 
> kernel BUG at include/linux/swapops.h:119
> 
> 117 static inline unsigned long swp_offset_pfn(swp_entry_t entry)
> 118 {
> 119         VM_BUG_ON(!is_pfn_swap_entry(entry));
> 120         return swp_offset(entry) & SWP_PFN_MASK;
> 121 }
> 
> 
> I've messed up the bisection three times now and ended up
> pointing at some innocent looking commit. So I wonder if
> anyone else has noticed and tried debugging.

I think I know why I messed up the bisection. I thought
the failure happens every time. But it seems that it only
happens most of the time. I must have accidentally marked
a build as "good" because I got "lucky" and my test passed.

Back to the bisect grindstone :-(

-Tony