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@xxxxxxxxxxxxxxxxxxxxxxxxx #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;
