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AJvYcCWxhmfipwvKhMh8D/mVBU4NRNTloEHyN7vt4Hjfs8olYRKz3pODD/A2+HfnF08T6+5SfRns1L0p5g==@kvack.org X-Gm-Message-State: AOJu0YxFo8kDZJ1Fh6VMvlRlDat9PVhb2ymNn9DTGnUCqbFTNIWnvFGu 2oaTk3SxHMCLQ6DOsMf+HLHLPQ3LvJydiMXrRLAGkjZnegNyXj6+giqoAxq0a6cQl30bojY0OJi hAFc5xU9G8LCYoEtjchWxC87/Qv4Z7GPBExD6 X-Google-Smtp-Source: AGHT+IF8THsb2wXUWrQi/D1S4TzCOI1qytUeBb9QnU2xNlDnWEvJQNfuwMXJJZLZG1BicrLdftQVMdA6xmzVUJwrZNg= X-Received: by 2002:a05:600c:5013:b0:426:6edd:61a7 with SMTP id 5b1f17b1804b1-43192ece940mr3856365e9.7.1729869690704; Fri, 25 Oct 2024 08:21:30 -0700 (PDT) MIME-Version: 1.0 References: <671b7fb2.050a0220.2e773.0000.GAE@google.com> <832afb0c-98b7-4d29-8436-1ff6a65133b8@lucifer.local> In-Reply-To: <832afb0c-98b7-4d29-8436-1ff6a65133b8@lucifer.local> From: Jann Horn Date: Fri, 25 Oct 2024 17:20:52 +0200 Message-ID: Subject: Re: [syzbot] [mm?] INFO: rcu detected stall in vms_complete_munmap_vmas To: Lorenzo Stoakes Cc: syzbot , Liam.Howlett@oracle.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com, vbabka@suse.cz, Greg Kroah-Hartman Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Stat-Signature: i9duip9jnx8994hq9yk59b7frp4c7tce X-Rspamd-Queue-Id: E0BBA1A0012 X-Rspamd-Server: rspam02 X-HE-Tag: 1729869667-196672 X-HE-Meta: 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 5hXspc8q 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 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 1:37=E2=80=AFPM 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=3D139f225f980= 000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=3D4a2bb21f91d= 75c65 > > dashboard link: https://syzkaller.appspot.com/bug?extid=3D0ca979b86eaec= 7337a89 > > 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=3D179f225f9= 80000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/3bf4a453ec2f/d= isk-c6d9e439.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/e4a2db2a5d95/vmli= nux-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 co= mmit: > > 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 rath= er 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. Random side comment: It would be nice if the kernel was able to report hangs in two steps; somehow scan and mark the stack in a first pass, then wait another minute or so, then scan the stack again to see which functions we haven't returned out of within that minute, or something along those lines...