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Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1qfvz4-005khz-7L; Tue, 12 Sep 2023 05:30:46 +0000 Date: Tue, 12 Sep 2023 06:30:46 +0100 From: Matthew Wilcox To: syzbot Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [mm?] kernel BUG in vma_replace_policy Message-ID: References: <000000000000f392a60604a65085@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <000000000000f392a60604a65085@google.com> X-Rspam-User: X-Stat-Signature: u9yhw97bubhnwwm139y5nezretq8fqhp X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 9555140003 X-HE-Tag: 1694496649-511332 X-HE-Meta: U2FsdGVkX18q7BcxHOa8DCf5xlFFUS6d3w9Ydb/Y2JWIaakp6BU9Xw8J88GYHgoiP9lgkPMZ/0LevqbN+8kkHUKkv8/yOvKt3bt8uWZMOTmFyIcHV/nnzn3dSRpTGdcK3zRlAXhrefptQjW5CoYxad8hLYTFFeOkdVKcKMxX7a3cO7M/i7YdgHnXE8MHcwI6g41F6Rc3QCEGyA7fZg4PvZ0LjHrBz3XGELXHpqAJCS/xsjj5HZzeif1m1tG0IHHhhPAUU4BG3Enla9WuuecgVRqFLAjegKHj4rv/xXZiRB8oHRfk8Cd2dngSZK3CY3K8C1PRF6HiG9RwE/jif3pU1M2fJf7qUpyoY5/uuKBsW87VwN20wV5yvKu1Qy5Sk5APahQoyduf9VTqlkkxqOGq3GvLHZp8lWfuXEpV0m6Y7qMlYi2WIg5RKxeGqG5xYGzH6ZtGq6xQOBI08EOxKfhjV3UFR5aAyxAIBMeaOUrIMcOaaXQBe/qVIVhGrdjet5eSiuR3SpSQNiFStsA6iYhnoQkErjgxwiWKh9ss67Q9pvaPW0PtSgbeacZm+6iaRCtAqxIjluJCCmPRAHDH2G1rLJkZpH60KzICC8zmTui3LL6XfUJWZDiEP5tT7xMdBUmR1Xu+/u33UXFIvg3p9c1km4mt784NkrRO8R9yPKy9CYdfaNtRjJWFHrvqWuIfC7tu/wqFZRJ/UmPHKixkgFvZZMwqKg0IMZTe7WcL/T0/QEgw0E4jWC1IUKtgs0qLv6dao/LDjn9YWDtcv8UNqb/aIj34Y9uSRAvC1AsTQXNrTItUFJP2rjvkAiLgOEzqjXWCEbcOY2jXrZt+Nv0GQu7fBDsxD6/JpQpqVMZRoESn2GHHtD/lfb3h87QUeQ8miUmOVEVFEKsHoj7Ugx+xvFh2Lzabr8mXzP6jKU4o6DIAE/Ci7YKl7+uWHt0GrBdAN9keg6ubY1JDa08mk0SgbXe kki3aKyZ 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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: On Tue, Sep 05, 2023 at 06:03:49PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: a47fc304d2b6 Add linux-next specific files for 20230831 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=16502ddba80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=6ecd2a74f20953b9 > dashboard link: https://syzkaller.appspot.com/bug?extid=b591856e0f0139f83023 > 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=120e7d70680000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1523f9c0680000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/b2e8f4217527/disk-a47fc304.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/ed6cdcc09339/vmlinux-a47fc304.xz > kernel image: https://storage.googleapis.com/syzbot-assets/bd9b2475bf5a/bzImage-a47fc304.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+b591856e0f0139f83023@syzkaller.appspotmail.com #syz test diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 42b5567e3773..90ad5fe60824 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1342,6 +1342,7 @@ static long do_mbind(unsigned long start, unsigned long len, vma_iter_init(&vmi, mm, start); prev = vma_prev(&vmi); for_each_vma_range(vmi, vma, end) { + vma_start_write(vma); err = mbind_range(&vmi, vma, &prev, start, end, new); if (err) break;