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 EF25CCFA759 for ; Fri, 21 Nov 2025 09:08:28 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3D5AA6B0032; Fri, 21 Nov 2025 04:08:28 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 3AC5A6B007B; Fri, 21 Nov 2025 04:08:28 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 29BDB6B0088; Fri, 21 Nov 2025 04:08:28 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id F2D676B0032 for ; Fri, 21 Nov 2025 04:08:27 -0500 (EST) Received: from smtpin28.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 1409216055B for ; Fri, 21 Nov 2025 09:08:25 +0000 (UTC) X-FDA: 84134038170.28.9884AA4 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) by imf01.hostedemail.com (Postfix) with ESMTP id 7394140007 for ; Fri, 21 Nov 2025 09:08:22 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=OtvIACLX; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=oDoLwJr6; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=OtvIACLX; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=oDoLwJr6; spf=pass (imf01.hostedemail.com: domain of vbabka@suse.cz designates 195.135.223.131 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1763716103; 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=aui9l7AgpNh+vCcDY9SRw7llzOsh+jqboWLjXhXxfO4=; b=32oZSaTBvSFtU6iawiF9hmlMMGXRkUju2jKScJr8rzQnVVaLHkFo0zH8BSjXTQ64XVr1KY 0Z10LL7vXqG0wRJj9/nCZufVBDSRSjiVy8DexBxSHl5AxWK3GqFRopBmjC2ejnJh+zFJgU XN+AC+n0dYMAN7/CIgEVXtKX2Ovp5ls= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1763716103; a=rsa-sha256; cv=none; b=mcJCwshgGqs30mcEDYrZlo6FP57S3FSWf21dxElyTTjyyyHYoN4hh54RxHa+0vrlwfrNC4 YK3CePUwCzjskkxk9E0Rv/a/X88EszmWlpe6xXPnXuxvqbBNq7QSsbG5U5pwTKRNVpZcFF lNhW/6TyikokB1Qia651+Tk/oe6e6U0= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=OtvIACLX; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=oDoLwJr6; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=OtvIACLX; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=oDoLwJr6; spf=pass (imf01.hostedemail.com: domain of vbabka@suse.cz designates 195.135.223.131 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none Received: from imap1.dmz-prg2.suse.org (imap1.dmz-prg2.suse.org [IPv6:2a07:de40:b281:104:10:150:64:97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 47F2E20F11; Fri, 21 Nov 2025 09:08:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1763716100; h=from:from:reply-to: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:autocrypt:autocrypt; bh=aui9l7AgpNh+vCcDY9SRw7llzOsh+jqboWLjXhXxfO4=; b=OtvIACLXgtdbS8YoKbF6+sVqsKnkEmY7oTxuELuDiFPTIyaNZBWaZ1Qp/ieCd1Ubi9epsp jw8pDdzt7N0oQtGqUTGY+LfwfUMgD0n9g9LM4UqBsHffwOv+PQoptPHLGI4bvTxloTI9DK rMPoIyyZIToZoxyiIEsNQWF+5aBB6p0= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1763716100; h=from:from:reply-to: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:autocrypt:autocrypt; bh=aui9l7AgpNh+vCcDY9SRw7llzOsh+jqboWLjXhXxfO4=; b=oDoLwJr6URXKC+fm3LWfjBq+79HSjVrlrtdX3ZtS8ERo7FwOlBnjYssE1qX9ZFTsN/HGU1 vlXZgQQIDrtfXZDw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1763716100; h=from:from:reply-to: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:autocrypt:autocrypt; bh=aui9l7AgpNh+vCcDY9SRw7llzOsh+jqboWLjXhXxfO4=; b=OtvIACLXgtdbS8YoKbF6+sVqsKnkEmY7oTxuELuDiFPTIyaNZBWaZ1Qp/ieCd1Ubi9epsp jw8pDdzt7N0oQtGqUTGY+LfwfUMgD0n9g9LM4UqBsHffwOv+PQoptPHLGI4bvTxloTI9DK rMPoIyyZIToZoxyiIEsNQWF+5aBB6p0= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1763716100; h=from:from:reply-to: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:autocrypt:autocrypt; bh=aui9l7AgpNh+vCcDY9SRw7llzOsh+jqboWLjXhXxfO4=; b=oDoLwJr6URXKC+fm3LWfjBq+79HSjVrlrtdX3ZtS8ERo7FwOlBnjYssE1qX9ZFTsN/HGU1 vlXZgQQIDrtfXZDw== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 2E6D93EA61; Fri, 21 Nov 2025 09:08:20 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id nvLuCgQsIGlkXgAAD6G6ig (envelope-from ); Fri, 21 Nov 2025 09:08:20 +0000 Message-ID: <18ae4b82-b18a-4ed8-8b72-4a9697a4dc8f@suse.cz> Date: Fri, 21 Nov 2025 10:08:19 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/mmap_lock: Reset maple state on lock_vma_under_rcu() retry To: Lorenzo Stoakes , "Paul E. McKenney" Cc: Matthew Wilcox , "Liam R. Howlett" , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Suren Baghdasaryan , Shakeel Butt , Jann Horn , stable@vger.kernel.org, syzbot+131f9eb2b5807573275c@syzkaller.appspotmail.com References: <20251111215605.1721380-1-Liam.Howlett@oracle.com> <2d93af49-fd76-4b05-aee7-0b4a32b1048e@lucifer.local> Content-Language: en-US From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Stat-Signature: 7c58h98hqiag5j31ocy8z8enx6arp6j3 X-Rspam-User: X-Rspamd-Queue-Id: 7394140007 X-Rspamd-Server: rspam01 X-HE-Tag: 1763716102-605328 X-HE-Meta: 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 MM6Ns3Mp wPlrMq6wJAgKHtB2a8yzUBRC5Tp6WNiFPV4apl99TrxB1We4TEO23XwphMuCqr2U16jvwK+fdPQ6JT1o4lozqgXrDtFLS6T42LvWlO783g8vjw+GwpaCYwCTs3uP9lfY7rqop4PDt2Gm4pDcwvnxJmVILyfZC2bZQo38MGi/XbRVbQ0yRelLqNUCoLxfqoWsAVUG1vkeYEtfQsuo936pQ/WUi/JXCt+jxll6OCxA8XUWrCMeU2MwXCtGKeAAiZfVtj8u2w3irbgy6Jyx+bEa3aYllCxVyN347yHXy5kNVxpre9T60CZlk1mr4Fj/iP8PP427VS4Qum95V3sAFxEYbRfxflAHOowduxlHmGwTFE3dwuw+QAwt3d061a3/wsJJBswJ7uCSEYjiWa8Xqt5yjxQBUWf3Ey36cTkBGob7DNln2Uh7snRxqq0VAPg== 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: (sorry for the late reply) On 11/13/25 12:05, Lorenzo Stoakes wrote: >> > > I think one source of confusion for me with maple tree operations is - what >> > > to do if we are in a position where some kind of reset is needed? >> > > >> > > So even if I'd realised 'aha we need to reset this' it wouldn't be obvious >> > > to me that we ought to set to the address. >> > >> > I think that's a separate problem. >> > >> > > > +++ b/mm/mmap_lock.c >> > > > @@ -257,6 +257,7 @@ struct vm_area_struct *lock_vma_under_rcu(struct mm_struct *mm, >> > > > if (PTR_ERR(vma) == -EAGAIN) { >> > > > count_vm_vma_lock_event(VMA_LOCK_MISS); >> > > > /* The area was replaced with another one */ >> > > > + mas_set(&mas, address); >> > > >> > > I wonder if we could detect that the RCU lock was released (+ reacquired) in >> > > mas_walk() in a debug mode, like CONFIG_VM_DEBUG_MAPLE_TREE? >> > >> > Dropping and reacquiring the RCU read lock should have been a big red >> > flag. I didn't have time to review the patches, but if I had, I would >> > have suggested passing the mas down to the routine that drops the rcu >> > read lock so it can be invalidated before dropping the readlock. >> >> There has been some academic efforts to check for RCU-protected pointers >> leaking from one RCU read-side critical section to another, but nothing >> useful has come from this. :-/ > > Ugh a pity. I was hoping we could do (in debug mode only obv) something > absolutely roughly like: > > On init: > > mas->rcu_critical_section = rcu_get_critical_section_blah(); AFAICT, get_state_synchronize_rcu()? > ... > > On walk: > > VM_WARN_ON(rcu_critical_section_blah() != mas->rcu_critical_section); And here, poll_state_synchronize_rcu()? It wouldn't detect directly that we dropped and reacquired the rcu read lock, but with enough testing, that would at some point translate to a new grace period between the first and second read lock, and we'd catch it then? > But sounds like that isn't feasible. I don't think what Paul says means your suggestion is not feasible. I think he says there are no known ways to do this checking automagicallt. But your suggestion is doing it manually for a specific case. I guess it depends on how many maple tree functions we'd have to change and how ugly it would be. > I always like the idea of us having debug stuff that helps highlight dumb > mistakes very quickly, no matter how silly they might be :) > >> >> But rcu_pointer_handoff() and unrcu_pointer() are intended not only for >> documentation, but also to suppress the inevitable false positives should >> anyone figure out how to detect leaking of RCU-protected pointers. >> >> Thanx, Paul > > Cheers, Lorenzo