linux-kernel - Re: [PATCH] tty: fix data race in n_tty_receive_buf

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Date:   Sat, 6 Jan 2018 13:20:49 +0530
From:   "Kohli, Gaurav" <gkohli@...eaurora.org>
To:     Alan Cox <gnomes@...rguk.ukuu.org.uk>
Cc:     jslaby@...e.com, gregkh@...uxfoundation.org, mikey@...ling.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] tty: fix data race in n_tty_receive_buf_common



On 1/6/2018 2:35 AM, Alan Cox wrote:
> On Sat, 6 Jan 2018 01:54:36 +0530
> "Kohli, Gaurav" <gkohli@...eaurora.org> wrote:
>
>> Hi Alan,
>>
>> Sorry correcting the typo here:
>> +retval =  tty_ldisc_lock(tty, 5 * HZ);
>> +if (retval)
>> +         goto err_release_lock;
>> tty->port->itty = tty;
>> /*
>> * Structures all installed ... call the ldisc open routines.
>> * If we fail here just call release_tty to clean up.  No need
>> * to decrement the use counts, as release_tty doesn't care.
>> */
>> retval = tty_ldisc_setup(tty, tty->link);
>>           if (retval)
>>               goto err_release_tty;
>> tty_ldisc_unlock(tty);
>> err_release_tty:
>> tty_info_ratelimited(tty, "ldisc open failed (%d), clearing slot %d\n",
>>       retval, idx);
>> +err_release_lock;
>> +tty_unlock(tty);
>> +release_tty(tty, idx);
>> +tty_ldisc_unlock(tty);
>> +return ERR_PTR(retval);
> Thanks - can you give that a testing since for some reason you seem to be
> the only system able to hit this and confirm that it's now working
> properly. Then I'll push it upstream
>
> And thanks for doing all the debug work to find this and identify what
> was going on.
>
> Alan
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Thanks Alan for your support, yes we will try to reproduce and get back 
to you.
Ideally it take 2-3 days for issue reproduction, but yes it is 
consistently reproducible.

Regards
Gaurav

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