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Received: from willy by casper.infradead.org with local (Exim 4.98 #2 (Red Hat Linux)) id 1tgKvt-00000007aP6-19jp; Fri, 07 Feb 2025 09:45:57 +0000 Date: Fri, 7 Feb 2025 09:45:57 +0000 From: Matthew Wilcox To: Miklos Szeredi Cc: Christian Heusel , Josef Bacik , Miklos Szeredi , regressions@lists.linux.dev, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Joanne Koong , linux-mm Subject: Re: [REGRESSION][BISECTED] Crash with Bad page state for FUSE/Flatpak related applications since v6.13 Message-ID: References: <2f681f48-00f5-4e09-8431-2b3dbfaa881e@heusel.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 80D0616000B X-Stat-Signature: wkiibezj8pxro8gzazomfcomisih9cw5 X-HE-Tag: 1738921560-1374 X-HE-Meta: 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 5kqQmA// DXjEJRiQ5VfYMXJe4CP3OZ4xTQm4Cvw8PJQgxcvxP8m5BgBnFS77ybzILxa8XnjTmkH4PkW6Ke8RC158aUY5ghPQ+J6rWRFMLsB4cuV3bRChVmMMMbyX701iNNe7fue2s+dBWV1RxCPNlzqrljIqXXCvN1ITWgteE2F4S6Ytc0MbA4H+rbp9qR4reVreT0ErWIzmqsNOtiRn8FvVEv1ZKVlyRWxw+qs81c9vI 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: List-Subscribe: List-Unsubscribe: On Fri, Feb 07, 2025 at 10:34:52AM +0100, Miklos Szeredi wrote: > Seems like page allocation gets an inconsistent page (mapcount != -1) > in the report below. I think you're misreading the report. _mapcount is -1. Which means mapcount is 0. > > Feb 06 08:54:47 archvm kernel: BUG: Bad page state in process rnote pfn:67587 > > Feb 06 08:54:47 archvm kernel: page: refcount:-1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x67587 > > Feb 06 08:54:47 archvm kernel: flags: 0xfffffc8000020(lru|node=0|zone=1|lastcpupid=0x1fffff) > > Feb 06 08:54:47 archvm kernel: raw: 000fffffc8000020 dead000000000100 dead000000000122 0000000000000000 flags lru.next lru.prev mapping > > Feb 06 08:54:47 archvm kernel: raw: 0000000000000000 0000000000000000 ffffffffffffffff 0000000000000000 index private mapcount:refcount memcg_data > > Feb 06 08:54:47 archvm kernel: page dumped because: PAGE_FLAGS_CHECK_AT_PREP flag(s) set So the problem is the lru flag is set. > > Feb 06 08:54:47 archvm kernel: dump_stack_lvl+0x5d/0x80 > > Feb 06 08:54:47 archvm kernel: bad_page.cold+0x7a/0x91 > > Feb 06 08:54:47 archvm kernel: __rmqueue_pcplist+0x200/0xc50 > > Feb 06 08:54:47 archvm kernel: get_page_from_freelist+0x2ae/0x1740 > > Feb 06 08:54:47 archvm kernel: __alloc_frozen_pages_noprof+0x184/0x330 > > Feb 06 08:54:47 archvm kernel: alloc_pages_mpol+0x7d/0x160 > > Feb 06 08:54:47 archvm kernel: folio_alloc_mpol_noprof+0x14/0x40 > > Feb 06 08:54:47 archvm kernel: vma_alloc_folio_noprof+0x69/0xb0 > > Feb 06 08:54:47 archvm kernel: do_anonymous_page+0x32a/0x8b0 It's very weird, because PG_lru is also in PAGE_FLAGS_CHECK_AT_FREE. So it should already have been checked and not be set. I'm on holiday until Monday, so I'm not going to dive into this any further.