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

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Date: Thu, 4 Apr 2024 15:05:33 -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: Machine check recovery broken in v6.9-rc1

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.

-Tony