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Date:   Thu, 26 Oct 2017 23:49:49 +0800
From:   Xin Long <>
To:     Dmitry Vyukov <>
Cc:     ChunYu Wang <>,
        David Miller <>,
        LKML <>,,
        netdev <>,
        Neil Horman <>,,
        Vladislav Yasevich <>
Subject: Re: WARNING in refcount_sub_and_test

On Thu, Oct 26, 2017 at 10:49 PM, Dmitry Vyukov <> wrote:
> On Thu, Oct 26, 2017 at 10:53 AM, ChunYu Wang <> 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
> Then run in
> qemu (most of the flags are probably irrelevant):
> qemu-system-x86_64 -hda wheezy.img -net
> user,host=,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.


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