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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1qRuvK-00A84H-7N; Fri, 04 Aug 2023 13:32:58 +0000 Date: Fri, 4 Aug 2023 14:32:58 +0100 From: Matthew Wilcox To: Yikebaer Aizezi Cc: akpm@linux-foundation.org, linux-mm@kvack.org, David Howells Subject: Re: WARNING in try_grab_page Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Stat-Signature: roioj9zhgkuk4s9ztzbm7wozozmg5b53 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 216C3140030 X-Rspam-User: X-HE-Tag: 1691155981-114171 X-HE-Meta: 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 zO9K6kKh dGg/NqDT7CYshbFmAHfkAklxh5j5OtGW6uoIywQNtoJRfg6LzKkFccXU7DHlYYN91+OLgqnTKpagGzANpH/0Vy6/Zahq38B9Uwx2SL2goaiSH7L12uECWGRfVQBdld+8SLmlp5RTOTZWivDoS68bvE3ijDoSCcS1/QCa4wWx47SEwoW9I8yJugDbyJ30D3PHdGLamhx1/M7YUQuxQBWNVmJ/ay3f86aNxp6120VBhhPs/tC1m9R0DYdfLup4QAEzA0uKuX9nBbnKqS3VDbCUcmow3yetFbOL2SlSi6CAMO2sefGA= 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 Fri, Aug 04, 2023 at 04:42:27AM +0100, Matthew Wilcox wrote: > On Fri, Aug 04, 2023 at 11:14:45AM +0800, Yikebaer Aizezi wrote: > > Just patched it, then I rerun the reproduce program, and I got this > > output from console: > > > > BUG: Bad page state in process POC pfn:0eb8d > > page:ffffea00003ae340 refcount:0 mapcount:0 mapping:0000000000000000 > > index:0x0 pfn:0xeb8d > > flags: 0xfff00000001000(reserved|node=0|zone=1|lastcpupid=0x7ff) > > page_type: 0xffffffff() > > raw: 00fff00000001000 ffffea00003ae348 ffffea00003ae348 0000000000000000 > > raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 > > page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set > > page_owner info is not present (never set?) > > Modules linked in: > > CPU: 0 PID: 7959 Comm: POC Not tainted 6.5.0-rc2 #2 > > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > > rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 > > Call Trace: > > > > __dump_stack lib/dump_stack.c:88 [inline] > > dump_stack_lvl+0xd4/0xf0 lib/dump_stack.c:106 > > bad_page+0x71/0x1a0 mm/page_alloc.c:533 > > free_page_is_bad_report mm/page_alloc.c:974 [inline] > > free_page_is_bad mm/page_alloc.c:984 [inline] > > free_pages_prepare mm/page_alloc.c:1153 [inline] > > free_unref_page_prepare+0x5f3/0xb50 mm/page_alloc.c:2348 > > free_unref_page+0x2f/0x3c0 mm/page_alloc.c:2443 > > __folio_put_small mm/swap.c:106 [inline] > > __folio_put+0xa2/0x110 mm/swap.c:129 > > folio_put include/linux/mm.h:1423 [inline] > > put_page include/linux/mm.h:1492 [inline] > > extract_user_to_sg lib/scatterlist.c:1151 [inline] > > Ohh. I think this is something Dave Howells has a patch for. Can you try https://lore.kernel.org/mm-commits/20230726204730.B89D8C433C7@smtp.kernel.org/ ?