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    SubjectRe: WARNING in refcount_sub_and_test
    On Thu, Oct 26, 2017 at 10:49 PM, Dmitry Vyukov <dvyukov@google.com> wrote:
    > On Thu, Oct 26, 2017 at 10:53 AM, ChunYu Wang <chunwang@redhat.com> wrote:
    >> Hi all,
    >>
    >> I am failed to reproduce it on target kernel with the reproducer file
    >> or replaying the target syzkaller description log file, do I made
    >> something wrong or there exists more subjects then the line in
    >> repro.txt:
    >>
    >> #{Threaded:true Collide:true Repeat:false Procs:1 Sandbox:namespace
    >> Fault:false FaultCall:-1 FaultNth:0 EnableTun:false UseTmpDir:true
    >> HandleSegv:false WaitRepeat:false Debug:false Repro:false}
    >
    >
    > Hi ChunYu,
    >
    > I've just re-tested the C repro and was able to trigger the bug in a second.
    > I've checked out 49ca1943a7adb429b11b8e05d81bc821694b76c7, copied the
    > provided config, run make olddefconfig, built with gcc-7 (you can get
    > the exact one here
    > https://storage.googleapis.com/syzkaller/gcc-7.tar.gz). Then run in
    > qemu (most of the flags are probably irrelevant):
    >
    > qemu-system-x86_64 -hda wheezy.img -net
    > user,host=10.0.2.10,hostfwd=tcp::10022-:22 -net nic -nographic -kernel
    > arch/x86/boot/bzImage -append "kvm-intel.nested=1
    > kvm-intel.unrestricted_guest=1 kvm-intel.ept=1
    > kvm-intel.flexpriority=1 kvm-intel.vpid=1
    > kvm-intel.emulate_invalid_guest_state=1 kvm-intel.eptad=1
    > kvm-intel.enable_shadow_vmcs=1 kvm-intel.pml=1
    > kvm-intel.enable_apicv=1 console=ttyS0 root=/dev/sda
    > earlyprintk=serial slub_debug=UZ vsyscall=native rodata=n oops=panic
    > panic_on_warn=1 panic=86400" -enable-kvm -pidfile vm_pid -m 2G -smp 4
    > -cpu host -usb -usbdevice mouse -usbdevice tablet -soundhw all
    Just wondering where we can get wheezy.img, if I can't download
    somewhere, can you provide one if possible ?

    I made some imgs before, with kernel built with the .config mail-list
    usually gave, the guest always failed to boot.

    Thanks.

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