linux-kernel - Re: v4.14-rc3/arm64 DABT exception in atomic_inc() / __skb

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Date:   Fri, 20 Oct 2017 16:11:13 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Wei Wei <dotweiba@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, edumazet@...gle.com, davem@...emloft.net,
        willemb@...gle.com, syzkaller@...glegroups.com
Subject: Re: v4.14-rc3/arm64 DABT exception in atomic_inc() / __skb_clone()

On Fri, Oct 20, 2017 at 10:40:38AM -0400, Wei Wei 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.

syz-repro should produce a smaller syzkaller log before it tries to
generate a C file.

I use:

$ syz-repro -config qemu.cfg logN

... and in most cases it will eventually print a smaller log to the
console.

Thanks,
Mark.