From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 43BFCCD3447 for ; Fri, 8 May 2026 11:53:53 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 65DA96B014F; Fri, 8 May 2026 07:53:52 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 635886B0150; Fri, 8 May 2026 07:53:52 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5716B6B0151; Fri, 8 May 2026 07:53:52 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 45A976B014F for ; Fri, 8 May 2026 07:53:52 -0400 (EDT) Received: from smtpin17.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay04.hostedemail.com (Postfix) with ESMTP id DBB7B1A08EB for ; Fri, 8 May 2026 11:53:51 +0000 (UTC) X-FDA: 84744093462.17.270007E Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf09.hostedemail.com (Postfix) with ESMTP id 03047140014 for ; Fri, 8 May 2026 11:53:49 +0000 (UTC) Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="jD/Q8+a8"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf09.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1778241230; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=AcWfX0aS980lh6ScLuEu97wAzEYNTYA7DpQ/RQh5IN8=; b=wXf/+lGGat7sldsdKeIXG2z6G3PeJ0SgZSP3eClOhVZ8SMlNJq/oKGW+UGebJaML+VAV42 XbOOonfkK6Ez9FpKFIGoWj0s+BdtfimeU+KqoMQfm8MNznqRKgB/Fysj6FPkJ8XDvDQYcF TSG11fHp0ACL2lnbJfM1jLVY2QjyMXM= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1778241230; a=rsa-sha256; cv=none; b=4MsHCB82lLB1x2LRuQo7wCiweIdR7Z6Ksv9RYiramAFZr0wDzikxhq0ohhCpXCjBacz2IN 4FMIzLG4OA+IWJt7ciV1Au0sIokBo0w1Fkfr8oEaD5aR89g8Cwxi6wuYqSil8Do1gMOSTg tST2WUcusjybE0QxrhCTa4EZ81UFDgU= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="jD/Q8+a8"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf09.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 52770600AE; Fri, 8 May 2026 11:53:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 630CAC2BCB8; Fri, 8 May 2026 11:53:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778241229; bh=xVjGIZ5IQRdyjqPF7MNwq83MBWf3864Rm+exjqz/+zM=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=jD/Q8+a8K/ft4wOZk8mdokkpVL/c/gQDZFTCQS5ez0XSneYmxlfRAtaMwNNaQPGKy zZEMzW3kW9/4iX7MGKRxUwnQgy0O/TEf42C/hioE6OxLz9jB7bNk8XyJ5Ub1Wq9JHq fLiGzHKIa9jLa3f/feUEcbCXU/PKQ8fSXXcH9SbH8z8T0L28ee8HF7DoWl9f1bvIVa adtf/6zkYF/Q6vWvlHodOxPhFA2fSjRjgpBVtJ6dAKUenY0rhYIoMmVwq6XdFZ5mm0 ebfN41jJI5G5vY4XDwd2/zaX30DZAsnMhRrIdksFrwKOGitKtz/LvZE5HdjRgPlmnn JLatZ7qJEknNw== Message-ID: <10e4565a-b416-45d9-a8b0-cd32532b2630@kernel.org> Date: Fri, 8 May 2026 13:53:43 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: "alloc_tag was not set" when running mm/ksft_hmm.sh To: Zenghui Yu , linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: jgg@ziepe.ca, leon@kernel.org, Andrew Morton , ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, Alistair Popple References: From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 03047140014 X-Stat-Signature: yt111a5p8sexcu3mmw4khrsye49dfdfe X-Rspam-User: X-HE-Tag: 1778241229-151576 X-HE-Meta: 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 m72giSip rJZqopLR42YXPTtjSgF3XwgbM3D1AQuJaEfBRymW4W2bEC9Qt013PLVMymlq5oW3Ytto0bJcP0WNJF1TqDbmdlXXfiHVPT1JdYgpPLLwwb8lSorYk91eiqA5pcwBrOukRfSkJmWgAda4zQE1Ehpz1TbHCe0wlmA+uG/qms7l2USNP00Qd3IJrxRUcy3Akb6bBJlRaonlfxLoU+4gQvMGBRExRf04wBqvcASIk9YcnUjZ3sXz5EBIgC2+qOqIyr5+YTt+Xc8avoTVmQcbS0BNPES1zyO4lJEzB4eTY2NH00qy5hDrHuq5krdfTt+Y8rygCy+tlQEr5Exjz2cbcSEd/Ij9BLlYMz90mVkma5XMBhZjJvGs= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/6/26 17:42, Zenghui Yu wrote: > Hi all, > > Running mm/ksft_hmm.sh triggers the following splat: > > ------------[ cut here ]------------ > alloc_tag was not set > WARNING: ./include/linux/alloc_tag.h:164 at ___free_pages+0x2a0/0x2d0, > CPU#5: hmm-tests/2020 > Modules linked in: test_hmm rfkill drm backlight fuse > CPU: 5 UID: 0 PID: 2020 Comm: hmm-tests Kdump: loaded Not tainted > 7.1.0-rc2-00099-gadc1e5c6203c-dirty #285 PREEMPT > Hardware name: QEMU QEMU Virtual Machine, BIOS > edk2-stable202408-prebuilt.qemu.org 08/13/2024 > pstate: 61400005 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) > pc : ___free_pages+0x2a0/0x2d0 > lr : ___free_pages+0x2a0/0x2d0 > sp : ffff80008345b530 > x29: ffff80008345b530 x28: ffff80008345b700 x27: ffffffffbfff8040 > x26: ffff0000c41cb360 x25: ffff0000c0c64008 x24: ffff800081aae400 > x23: 05ffff0000000200 x22: 0000000000000000 x21: 0000000000000000 > x20: fffffdffc5f20040 x19: 0000000000000000 x18: fffffffffffe7c78 > x17: 0000000000000000 x16: 0000000000000000 x15: fffffffffffe7c98 > x14: 00000000000001d1 x13: ffff8000818f3d58 x12: 0000000000000573 > x11: fffffffffffe7c98 x10: ffff80008194bd58 x9 : 3ffffffffffff000 > x8 : ffff8000818f3d58 x7 : ffff80008194bd58 x6 : 0000000000000000 > x5 : ffff0001fedb1088 x4 : 0000000000000001 x3 : 0000000000000000 > x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c7f58000 > Call trace: > ___free_pages+0x2a0/0x2d0 (P) > __free_pages+0x14/0x20 > dmirror_devmem_free+0x13c/0x158 [test_hmm] > free_zone_device_folio+0x144/0x1e4 > __folio_put+0x124/0x130 > free_folio_and_swap_cache+0xa8/0xcc > __folio_split+0x664/0x7fc > split_folio_to_list+0x50/0x5c > migrate_vma_split_folio+0x13c/0x25c > migrate_vma_collect_pmd+0xed4/0xf68 > walk_pgd_range+0x598/0x9a0 > __walk_page_range+0x90/0x1a0 > walk_page_range_mm_unsafe+0x194/0x20c > walk_page_range+0x20/0x2c > migrate_vma_setup+0x18c/0x224 > dmirror_devmem_fault+0x188/0x2b8 [test_hmm] > do_swap_page+0x1458/0x185c > __handle_mm_fault+0x85c/0x1ba0 > handle_mm_fault+0xb0/0x290 > do_page_fault+0x1f8/0x6f8 > do_translation_fault+0x60/0x6c > do_mem_abort+0x44/0x94 > el0_da+0x30/0xdc > el0t_64_sync_handler+0xd0/0xe4 > el0t_64_sync+0x198/0x19c > ---[ end trace 0000000000000000 ]--- > lib/test_hmm.c:705 module test_hmm func:dmirror_devmem_alloc_page has > 16744448 allocated at module unload > > > It was tested on kernel built with arm64's virt.config and > > +CONFIG_ZONE_DEVICE=y > +CONFIG_DEVICE_PRIVATE=y > +CONFIG_TEST_HMM=m > +CONFIG_MEM_ALLOC_PROFILING=y > +CONFIG_MEM_ALLOC_PROFILING_DEBUG=y I assume there is a weird interaction between alloc tags and simulated ZONE_DEVICE memory in test_hmm.c @Alistair, any idea? -- Cheers, David