From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: kernel test robot <lkp@intel.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
LKML <linux-kernel@vger.kernel.org>,
"open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
lkp@lists.01.org
Subject: Re: [serial] 679193b7ba: BUG:spinlock_bad_magic_on_CPU
Date: Sun, 2 Aug 2020 12:58:08 +0200 [thread overview]
Message-ID: <20200802105808.GA164531@kroah.com> (raw)
In-Reply-To: <CAHp75Vcdwz2RynZ0KVCDMFyO_GPREgGdCNVNGqosjf6iV0_uog@mail.gmail.com>
On Sun, Aug 02, 2020 at 01:50:29PM +0300, Andy Shevchenko wrote:
> On Sun, Aug 2, 2020 at 8:54 AM kernel test robot <lkp@intel.com> wrote:
> >
> > Greeting,
> >
> > FYI, we noticed the following commit (built with gcc-9):
> >
> > commit: 679193b7baf8d88e41cbeb397ca17f797654947d ("serial: 8250: Let serial core initialise spin lock")
> > https://git.kernel.org/cgit/linux/kernel/git/gregkh/tty.git tty-next
> >
> >
> > in testcase: boot
> >
> > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
> >
> > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> >
> >
> > +-------------------------------+------------+------------+
> > | | f3af1b68fc | 679193b7ba |
> > +-------------------------------+------------+------------+
> > | boot_successes | 4 | 0 |
> > | boot_failures | 0 | 4 |
> > | BUG:spinlock_bad_magic_on_CPU | 0 | 4 |
> > +-------------------------------+------------+------------+
> >
> >
> > If you fix the issue, kindly add following tag
> > Reported-by: kernel test robot <lkp@intel.com>
>
> Thanks for the report. I didn't see it on real hardware though. Maybe
> because of timing (race?) differences.
>
> Greg, I think the best is to revert the change until I will have better one.
Can you send me a revert patch with the reported-by: set up?
thanks,
greg k-h
next prev parent reply other threads:[~2020-08-02 10:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-02 5:48 [serial] 679193b7ba: BUG:spinlock_bad_magic_on_CPU kernel test robot
2020-08-02 10:50 ` Andy Shevchenko
2020-08-02 10:58 ` Greg Kroah-Hartman [this message]
2020-08-02 11:16 ` Andy Shevchenko
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