v4.14-rc3/arm64 DABT exception in atomic_inc() / __skb_clone()

[Willem de Bruijn]

On Fri, Oct 20, 2017 at 11:14 AM, Dmitry Vyukov <dvyukov at google.com> wrote:
> On Fri, Oct 20, 2017 at 4:40 PM, Wei Wei <dotweiba at gmail.com> wrote:
>> Sadly, the syzkaller characterized it as a non-reproducible bug and there were empty
>>  repro files. But if manually executing in VM like this “./syz-execprog -executor=
>> ./syz-executor -repeat=0 -procs=16 -cover=0 crash-log”, it crashed when executing exactly
>> program 1056 using log0 provided.
>>
>> I failed to generate the C reproducer with syz-repro as it said “no target compiler”
>> in the final step. I would appreciate if you could give some hints.
>
> syzkaller tries to use aarch64-linux-gnu-gcc when cross-compiling to arm64:
> https://github.com/google/syzkaller/blob/master/sys/targets/targets.go#L62
> Try to install g++-aarch64-linux-gnu.
> Or how should it be done on your system?

A core dump would also be helpful to root around in and inspect
what those registers point to. Thanks for posting the various reports
on github, btw.