On Mon, Jul 10, 2023, Andrew Morton wrote: > On Sun, 9 Jul 2023 14:32:09 -0700 Zheng Zhang <zheng.zhang@xxxxxxxxxxxxx> wrote: > > > Kees, Andrew, and to whom it may concern: > > > > Hello! We have found a bug in the Linux kernel version 6.2.0 by syzkaller > > with our own templates. It also produces a POC. > > Attached is the report, log, and reproducers generated by syzkaller > > Please let me know if there is any additional information that I can > > provide to help debug this issue. > > Thanks! > > Let's cc the kvm mailing list. > > Original email is at > https://lkml.kernel.org/r/CAC_GQSr3xzZaeZt85k_RCBd5kfiOve8qXo7a81Cq53LuVQ5r=Q@xxxxxxxxxxxxxx Yeaaaah. We failed kernel programming 101. KVM installs file descriptors to let userspace read VM and vCPU stats, but doesn't grab a reference to the VM to ensure the VM and its vCPUs are kept alive until the stats fds are closed. I'll send a patch.
