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SubjectRe: WARNING in usbhid_raw_request/usb_submit_urb (2)
On Wed, 8 Jan 2020, syzbot wrote:

> Hello,
>
> syzbot has tested the proposed patch and the reproducer did not trigger
> crash:
>
> Reported-and-tested-by:
> syzbot+10e5f68920f13587ab12@syzkaller.appspotmail.com
>
> Tested on:
>
> commit: ecdf2214 usb: gadget: add raw-gadget interface
> git tree: https://github.com/google/kasan.git
> kernel config: https://syzkaller.appspot.com/x/.config?x=b06a019075333661
> dashboard link: https://syzkaller.appspot.com/bug?extid=10e5f68920f13587ab12
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> patch: https://syzkaller.appspot.com/x/patch.diff?x=1583963ee00000
>
> Note: testing is done by a robot and is best-effort only.

I'm at a loss for a way to track this down any farther. The difference
between this patch and the previous was very small and almost entirely
confined to actions that take place _after_ the bug condition has been
detected.

If this is indeed caused by a race, it would be nice to know that the
two racing threads are doing. One of them we can see in the log output
(it's calling usb_control_msg) but the other is a mystery.

Alan Stern

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