Syzkaller Crash

[Shankara Pailoor]

Hi All,

We are encountering an issue when running syzkaller and I'm not sure if it is a problem on our end, syzkaller's or the kernels.

Attached is the crash log and a screenshot of the webpage. I checked under the crash directory of my workdir and I see no repro programs. At the bottom of the crash log I see "cannot open /dev/net/tun", but when I ssh into the node and create it I'm getting "unable to copy binary" errors.

I'm running this inside of VMware fusion 8, with Linux Kernel 4.10-rc7 and the wheezy.img generated from create-image.sh. The program seems to hang on this particular input and doesn't progress.

Regards,

Shankara

[Andrey Konovalov]

Hi Shankara,

/dev/net/tun is used by syzkaller to fuzz the networking receive paths
of the kernel.
Unfortunately syzkaller doesn't correctly detect that /dev/net/tun is
not available in your kernel.
I'll try to fix this tomorrow.

For now you can either:
1. Enable CONFIG_TUN=y in your kernel config or
2. Add syz_emit_ethernet to disabled_syscalls in your manager config

That should help.

Thanks!

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[Shankara Pailoor]

Hi Andrey,

Thanks for letting me know. I added syz_emit_ethernet to the disabled_syscalls and it is running fine. 

Regards,

Shankara

> email to syzkaller+unsubscribe@googlegroups.com.

[Andrey Konovalov]

Hi Shankara,

FYI: the fix was committed a few days ago:
https://github.com/google/syzkaller/commit/b042176ac78c191253124063054b63153abcbe96

Thanks!

>> > email to syzkaller+...@googlegroups.com.

[Shankara Pailoor]

Thanks!

>> > email to syzkaller+unsubscribe@googlegroups.com.