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SubjectRe: WARNING in syscall_exit_to_user_mode
On Fri, Sep 11, 2020 at 03:39:19AM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: f4d51dff Linux 5.9-rc4
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=12a4e7cd900000
> kernel config: https://syzkaller.appspot.com/x/.config?x=a9075b36a6ae26c9
> dashboard link: https://syzkaller.appspot.com/bug?extid=7ffc7214b893651d52b8
> compiler: gcc (GCC) 10.1.0-syz 20200507
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=122d7335900000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13cea1a5900000
>
> Bisection is inconclusive: the issue happens on the oldest tested release.
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=162247cd900000
> final oops: https://syzkaller.appspot.com/x/report.txt?x=152247cd900000
> console output: https://syzkaller.appspot.com/x/log.txt?x=112247cd900000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+7ffc7214b893651d52b8@syzkaller.appspotmail.com
>
> ------------[ cut here ]------------
> syscall 56 left IRQs disabled

This WARN appears reachable. :)

I also see on the dashboard these other problems with the new entry
code:

https://syzkaller.appspot.com/bug?extid=d4336c84ed0099fdbe47
https://syzkaller.appspot.com/bug?extid=c4af95386364bc59b13e

I can't tell if any of these have been looked at yet, though.

--
Kees Cook

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