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[139.178.88.99 listed in bl.score.senderscore.com] 1.5 HEADER_FROM_DIFFERENT_DOMAINS From and EnvelopeFrom 2nd level mail domains are different 25 PP_MIME_FAKE_ASCII_TEXT BODY: MIME text/plain claims to be ASCII but isn't -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -1.0 MAILING_LIST_MULTI Multiple indicators imply a widely-seen list manager X-Old-Subject:+ mm-hugetlb-avoid-soft-lockup-when-mprotect-to-large-memory-area.patch added to mm-hotfixes-unstable branch Subject:*****SPAM***** + mm-hugetlb-avoid-soft-lockup-when-mprotect-to-large-memory-area.patch added to mm-hotfixes-unstable branch X-Spam-Status: Yes, score=25.4, +20 total spam score SpamTally: Final spam score: 274 The patch titled Subject: mm: hugetlb: avoid soft lockup when mprotect to large memory area has been added to the -mm mm-hotfixes-unstable branch. Its filename is mm-hugetlb-avoid-soft-lockup-when-mprotect-to-large-memory-area.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hugetlb-avoid-soft-lockup-when-mprotect-to-large-memory-area.patch This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: Yang Shi Subject: mm: hugetlb: avoid soft lockup when mprotect to large memory area Date: Mon, 29 Sep 2025 13:24:02 -0700 When calling mprotect() to a large hugetlb memory area in our customer's workload (~300GB hugetlb memory), soft lockup was observed: watchdog: BUG: soft lockup - CPU#98 stuck for 23s! [t2_new_sysv:126916] CPU: 98 PID: 126916 Comm: t2_new_sysv Kdump: loaded Not tainted 6.17-rc7 Hardware name: GIGACOMPUTING R2A3-T40-AAV1/Jefferson CIO, BIOS 5.4.4.1 07/15/2025 pstate: 20400009 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : mte_clear_page_tags+0x14/0x24 lr : mte_sync_tags+0x1c0/0x240 sp : ffff80003150bb80 x29: ffff80003150bb80 x28: ffff00739e9705a8 x27: 0000ffd2d6a00000 x26: 0000ff8e4bc00000 x25: 00e80046cde00f45 x24: 0000000000022458 x23: 0000000000000000 x22: 0000000000000004 x21: 000000011b380000 x20: ffff000000000000 x19: 000000011b379f40 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000000 x9 : ffffc875e0aa5e2c x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : fffffc01ce7a5c00 x4 : 00000000046cde00 x3 : fffffc0000000000 x2 : 0000000000000004 x1 : 0000000000000040 x0 : ffff0046cde7c000 Call trace:   mte_clear_page_tags+0x14/0x24   set_huge_pte_at+0x25c/0x280   hugetlb_change_protection+0x220/0x430   change_protection+0x5c/0x8c   mprotect_fixup+0x10c/0x294   do_mprotect_pkey.constprop.0+0x2e0/0x3d4   __arm64_sys_mprotect+0x24/0x44   invoke_syscall+0x50/0x160   el0_svc_common+0x48/0x144   do_el0_svc+0x30/0xe0   el0_svc+0x30/0xf0   el0t_64_sync_handler+0xc4/0x148   el0t_64_sync+0x1a4/0x1a8 Soft lockup is not triggered with THP or base page because there is cond_resched() called for each PMD size. Although the soft lockup was triggered by MTE, it should be not MTE specific. The other processing which takes long time in the loop may trigger soft lockup too. So add cond_resched() for hugetlb to avoid soft lockup. Link: https://lkml.kernel.org/r/20250929202402.1663290-1-yang@os.amperecomputing.com Fixes: 8f860591ffb2 ("[PATCH] Enable mprotect on huge pages") Signed-off-by: Yang Shi Tested-by: Carl Worth Reviewed-by: Christoph Lameter (Ampere) Reviewed-by: Catalin Marinas Acked-by: David Hildenbrand Acked-by: Oscar Salvador Reviewed-by: Anshuman Khandual Cc: Muchun Song Cc: Will Deacon Cc: Signed-off-by: Andrew Morton --- mm/hugetlb.c | 2 ++ 1 file changed, 2 insertions(+) --- a/mm/hugetlb.c~mm-hugetlb-avoid-soft-lockup-when-mprotect-to-large-memory-area +++ a/mm/hugetlb.c @@ -7203,6 +7203,8 @@ long hugetlb_change_protection(struct vm psize); } spin_unlock(ptl); + + cond_resched(); } /* * Must flush TLB before releasing i_mmap_rwsem: x86's huge_pmd_unshare _ Patches currently in -mm which might be from yang@os.amperecomputing.com are mm-hugetlb-avoid-soft-lockup-when-mprotect-to-large-memory-area.patch From - Wed Oct 08 05:40:58 2025 X-Mozilla-Status: 0001 X-Mozilla-Status2: 00000000 >From stable+bounces-183564-hi=josie.lol@vger.kernel.org Tue Oct 07 21:01:58 2025 Return-path: Envelope-to: hi@josie.lol Delivery-date: Tue, 07 Oct 2025 21:01:58 +0000 Received: from dfw.mirrors.kernel.org ([142.0.200.124]) by witcher.mxrouting.net with esmtps (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.98) (envelope-from ) id 1v6Eon-0000000B29H-3T6u for hi@josie.lol; Tue, 07 Oct 2025 21:01:58 +0000 Received: from smtp.subspace.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.mirrors.kernel.org (Postfix) with ESMTPS id 6EB244E5438 for ; Tue, 7 Oct 2025 21:01:50 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2017423B63C; Tue, 7 Oct 2025 21:01:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="CFni1JTR" X-Original-To: stable@vger.kernel.org Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EC5B8170A11; Tue, 7 Oct 2025 21:01:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759870908; cv=none; b=WEQ4/FtTaGFfg0DdO4FTuxvA3uvwBdfF+ilUd+x5CHqei/EmLZt3sWh1+6fiLvKdg1fTHcliSrGKINsSjKgJRVNAfSe7ymGeIcWcf4P1SyhijZkEhKUw2OwodPIh3Q/PXTaQ1kFBD7HfZb5LUYbgUUWNI03D+4gAwn7rXSn5A0M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759870908; c=relaxed/simple; bh=x+J9eQYLlkTzqNpL7AHnho/40dEdQZdEafRMKtT40XY=; h=Date:To:From:Subject:Message-Id; b=t7bR6WyHHxWtPuC5QD3xw5EWHWAImrWcvBDFwZZreyrxZk0NKe0Sy80i0gpi15Zk2WdUi6hU6TpZxzb2PlJzNZRjx3Gj3QxlYTt1cvvaG3S/JBkUsxyuaijHytfSgPZoQNEIwtVnfaGA8PCluXTSLQiON18EFjG3H/sjHU4+Sw4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=CFni1JTR; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7D7B2C4CEF1; Tue, 7 Oct 2025 21:01:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1759870906; bh=x+J9eQYLlkTzqNpL7AHnho/40dEdQZdEafRMKtT40XY=; h=Date:To:From:Subject:From; b=CFni1JTRH9Qe7ZVw4t2bbI8ALSz1Pa1KDhKQaQkvUMupXMi12KQabpWJIA3l4Tpz8 jiMP/esVPHWLc2R7Pv68KIVlwvZQxxfJFdVXI8KksmWgI8K1hxVvOyro/URW6AQBgL xi9fInhpTpUCYNudW/fTiI7AqMcEys0oS/EtyXD0= Date: Tue, 07 Oct 2025 14:01:45 -0700 To: mm-commits@vger.kernel.org,will@kernel.org,stable@vger.kernel.org,osalvador@suse.de,muchun.song@linux.dev,dev.jain@arm.com,david@redhat.com,cl@gentwo.org,catalin.marinas@arm.com,carl@os.amperecomputing.com,anshuman.khandual@arm.com,yang@os.amperecomputing.com,akpm@linux-foundation.org From: Andrew Morton Message-Id: <20251007210146.7D7B2C4CEF1@smtp.kernel.org> Precedence: bulk X-Mailing-List: stable@vger