netlink: add addr 172.30.0.1 dev nr0: No such device

[Tushar Vyavahare]

Hi Team,

I'm running syzkaller with isolated linux host setup.

Here I'm getting below errors with --debug option:

03:41:23 executing program 0:
openat$custom(0xffffffffffffff9c, 0x0, 0xa0100, 0x0)
bitmap is not found, coverage filter disabled
spawned loop pid 25450
mount(fusectl) failed: 16
netlink: add addr 172.30.0.1 dev nr0: No such device
netlink: device nr0 up master NULL: No such device
netlink: add addr 172.30.1.1 dev rose0: No such device
netlink: device rose0 up master NULL: No such device
netlink: adding device ip6gretap0 type ip6gretap: Operation not supported

Thanks & Regards,

-Tushar

[Dmitry Vyukov]

Hi Tushar,

This is not an error. Just ignore this message.

[Tushar Vyavahare]

Thanks Dmitry for quick response.

I have one more question, In the isolated host setup, if I want to add custom driver for fuzzing,

so how I should achieve this ? I need to load a driver on host first and then run syzkaller or is there any way that I can tell that pick up driver from particular path while running VM instances ?

[Dmitry Vyukov]

On Fri, 1 Jul 2022 at 20:17, Tushar Vyavahare <tus...@gmail.com> wrote:
>
> Thanks Dmitry for quick response.
> I have one more question, In the isolated host setup, if I want to add custom driver for fuzzing,
> so how I should achieve this ? I need to load a driver on host first and then run syzkaller or is there any way that I can tell that pick up driver from particular path while running VM instances ?

You can use the tested machine init to pre-load the driver. Or
vm/isolated type has a "startup_script" parameter that can be used to
preload the driver I think (though, never used it).

> On Friday, July 1, 2022 at 4:06:11 PM UTC+5:30 Dmitry Vyukov wrote:
>>
>> On Fri, 1 Jul 2022 at 11:50, Tushar Vyavahare <tus...@gmail.com> wrote:
>> >
>> > Hi Team,
>> >
>> > I'm running syzkaller with isolated linux host setup.
>> > Here I'm getting below errors with --debug option:
>> >
>> > 03:41:23 executing program 0:
>> > openat$custom(0xffffffffffffff9c, 0x0, 0xa0100, 0x0)
>> > bitmap is not found, coverage filter disabled
>> > spawned loop pid 25450
>> > mount(fusectl) failed: 16
>> > netlink: add addr 172.30.0.1 dev nr0: No such device
>> > netlink: device nr0 up master NULL: No such device
>> > netlink: add addr 172.30.1.1 dev rose0: No such device
>> > netlink: device rose0 up master NULL: No such device
>> > netlink: adding device ip6gretap0 type ip6gretap: Operation not supported
>>
>> Hi Tushar,
>>
>> This is not an error. Just ignore this message.
>

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