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Wed, 22 Sep 2021 12:58:20 -0700 (PDT) MIME-Version: 1.0 References: <20210819054116.266126-1-shy828301@gmail.com> <20210819054116.266126-3-shy828301@gmail.com> In-Reply-To: From: Yang Shi Date: Wed, 22 Sep 2021 12:58:08 -0700 Message-ID: Subject: Re: [v2 PATCH 3/3] mm: hwpoison: dump page for unhandlable page To: "Luck, Tony" Cc: =?UTF-8?B?SE9SSUdVQ0hJIE5BT1lBKOWggOWPoyDnm7TkuZ8p?= , Oscar Salvador , tdmackey@twitter.com, David Hildenbrand , Matthew Wilcox , Andrew Morton , Jonathan Corbet , Linux MM , Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 998551000099 X-Stat-Signature: eawcfdkoadkujkhrmcd3g5o6bjfagbum Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=YPqYaNll; spf=pass (imf07.hostedemail.com: domain of shy828301@gmail.com designates 209.85.208.48 as permitted sender) smtp.mailfrom=shy828301@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-HE-Tag: 1632340701-257888 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Sep 22, 2021 at 12:37 PM Luck, Tony wrote: > > On Wed, Aug 18, 2021 at 10:41:16PM -0700, Yang Shi wrote: > > Currently just very simple message is shown for unhandlable page, e.g. > > non-LRU page, like: > > soft_offline: 0x1469f2: unknown non LRU page type 5ffff0000000000 () > > > > It is not very helpful for further debug, calling dump_page() could show > > more useful information. > > Looks like your code already caught something. An error injection > test may have injected into a shared library. Though I'm not sure that > the refcount/mapcount in the dump agrees with that diagnosis from the > author of this test. The messages from dump_page() are (unwind them from mce logs): [ 4817.630520] page:000000003ab9dca4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xcef2747 [ 4817.646860] flags: 0x57ffffc0801000(reserved|hwpoison|node=1|zone=2|lastcpupid=0x1fffff) [ 4818.033689] raw: 0057ffffc0801000 ffd400033bc9d1c8 ffd400033bc9d1c8 0000000000000000 [ 4818.280640] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 The page flags tell it is a "reserved" page and mapping is NULL. It doesn't seem like a user page or movable page, so hwpoision can't handle it so that the messages are dumped. > > Here's what appeared on the console: > > [ 4817.622254] mce: Uncorrected hardware memory error in user-access at cef2747000 > [ 4817.630520] page:000000003ab9dca4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xcef2747 > [ 4817.638651] mce: Uncorrected hardware memory error in user-access at cef2747000 > [ 4817.646860] flags: 0x57ffffc0801000(reserved|hwpoison|node=1|zone=2|lastcpupid=0x1fffff) > [ 4818.025515] mce: Uncorrected hardware memory error in user-access at cef2747000 > [ 4818.033689] raw: 0057ffffc0801000 ffd400033bc9d1c8 ffd400033bc9d1c8 0000000000000000 > [ 4818.272435] mce: Uncorrected hardware memory error in user-access at cef2747000 > [ 4818.280640] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 > [ 4818.280658] mce: Uncorrected hardware memory error in user-access at cef2747000 > [ 4818.313606] mce: Uncorrected hardware memory error in user-access at cef2747000 > [ 4818.321804] page dumped because: hwpoison: unhandlable page > [ 4818.564802] mce: Uncorrected hardware memory error in user-access at cef2747000 > [ 4818.573043] Memory failure: 0xcef2747: recovery action for unknown page: Ignored > [ 4818.595837] Memory failure: 0xcef2747: already hardware poisoned > [ 4818.603245] Memory failure: 0xcef2747: Sending SIGBUS to multichase:67460 due to hardware memory corruption > [ 4818.614297] Memory failure: 0xcef2747: already hardware poisoned > > -Tony