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Date:   Tue, 13 Nov 2018 15:37:59 -0500 (EST)
From:   Alan Stern <>
To:     syzbot <>
cc:, <>,
        <>, <>,
        <>, <>,
Subject: Re: WARNING in usb_submit_urb (4)

On Mon, 12 Nov 2018, syzbot wrote:

> syzbot has found a reproducer for the following crash on:
> HEAD commit:    e12e00e388de Merge tag 'kbuild-fixes-v4.20' of git://git.k..
> git tree:       upstream
> console output:
> kernel config:
> dashboard link:
> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> syz repro:
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by:

I tried reproducing this bug on my own system, following the 
instructions at

The reproducer failed to run properly.  It produced the following 

$ ./syz-execprog -cover=0 -threaded=1 -repeat=1 -procs=4 /tmp/repro.syz 
2018/11/13 15:29:32 parsed 1 programs
2018/11/13 15:29:32 executed programs: 0
2018/11/13 15:29:32 result: failed=false hanged=false err=executor 3: failed: tun: ioctl(TUNSETIFF) failed (errno 1)
loop failed (errno 0)

tun: ioctl(TUNSETIFF) failed (errno 1)
loop failed (errno 0)

The system is Fedora 28 running the 4.18.16-200.fc28.x86_64 kernel.  
What should I do to investigate further?

Alan Stern

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