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AJvYcCWp7AD/8RavwsJMBdAv1XKvesAEmyRVbKrX2NSgKxReMihhEKYvjRx6NiJf9bnfEyjbhPCKn1iFsQ==@kvack.org X-Gm-Message-State: AOJu0YyYweZeigqNBfG8NF7jVyOKER4V7DXZ2dnnfzeejgaYItmIKHeL u1dYwEr/hvvbLh2dKPOOeST+zYTgJ37jZJRzjEnVYJZsg7tPzDCoOMAfpX5TIA== X-Google-Smtp-Source: AGHT+IFRC0zpJ4ztR+NlXTGogQURe8G0MbwFZddw+Mqy2FLyvvPsPABgZ1YxFaEmRVPEcniozaRZvw== X-Received: by 2002:a05:6214:2dc5:b0:6cc:44b:1060 with SMTP id 6a1803df08f44-6ce342d2640mr129470286d6.32.1729869216999; Fri, 25 Oct 2024 08:13:36 -0700 (PDT) Received: from rowland.harvard.edu ([2607:fb60:2501:2805:c6d5:fe22:7fa3:ec54]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6d179a5660asm6443376d6.140.2024.10.25.08.13.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Oct 2024 08:13:36 -0700 (PDT) Date: Fri, 25 Oct 2024 11:13:33 -0400 From: Alan Stern To: Lorenzo Stoakes Cc: syzbot , Liam.Howlett@oracle.com, akpm@linux-foundation.org, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com, vbabka@suse.cz, Greg Kroah-Hartman Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in vms_complete_munmap_vmas Message-ID: <967f3aa0-447a-4121-b80b-299c926a33f5@rowland.harvard.edu> References: <671b7fb2.050a0220.2e773.0000.GAE@google.com> <832afb0c-98b7-4d29-8436-1ff6a65133b8@lucifer.local> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <832afb0c-98b7-4d29-8436-1ff6a65133b8@lucifer.local> X-Rspamd-Queue-Id: 8507D1C0008 X-Stat-Signature: tktweu6j1x3pb95dds5nk5um8h39a71w X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1729869193-388564 X-HE-Meta: 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 W5xZK/UW 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 MhqasI08 3UuDQ9J7Wue8dOxpxxvpkDccJqQ3yeU13Y+9SnhIvuS98TqgOpcgkiIi1JGWAO1cLoknmu4X4Ml+fhLM/WSUKF0omY/zOblpxIOQFroezrVIWr0BKTjTLavmuhnb7TevqxyuPynpg5jzftzvagJv43ayrCooxeJiqWkDoa5WfI+oDQMn01/rh2C4WXsEWeG8O3XMYzX/h9YulFfIAH6HY19NLjWf4UbiFd1K6q5/VOzTKW514mRBdk6fTwvaYEPJ4HKrcMfG4yU7wv1Xy5sbEN2TG4jBbiMAuqoo3/rNT+4DyHRXMn229pMO6gILuE0Ed4dTWyhx2d6mSKksXr/OLNcAb7rEO6+B1LwWgQKtIYE= 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, Oct 25, 2024 at 12:37:36PM +0100, Lorenzo Stoakes wrote: > On Fri, Oct 25, 2024 at 04:23:30AM -0700, syzbot wrote: > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: c6d9e43954bf Merge 6.12-rc4 into usb-next > > git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing > > console output: https://syzkaller.appspot.com/x/log.txt?x=139f225f980000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=4a2bb21f91d75c65 > > dashboard link: https://syzkaller.appspot.com/bug?extid=0ca979b86eaec7337a89 > > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=179f225f980000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/3bf4a453ec2f/disk-c6d9e439.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/e4a2db2a5d95/vmlinux-c6d9e439.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/8eb8e481b288/bzImage-c6d9e439.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+0ca979b86eaec7337a89@syzkaller.appspotmail.com > > > > Isn't this just the same thing as [0]? > > Again I think we're just happening to hit a stall in the unmap logic rather than > this being an mm thing. > > We retried that one a few times and it didn't hit any mm code after the > first time. > > Greg mentioned there was some weirdness with the dummy usb hcd controller > in [1]. For what it's worth, that weirdness has been fixed in 6.12-rc4 by commit 5189df7b8088 ("USB: gadget: dummy-hcd: Fix "task hung" problem"). Alan Stern