linux-kernel - Re: [linus:master] [serial] 43066e3222: BUG:kernel_NULL_pointer

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Date: Thu, 4 Apr 2024 14:59:19 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Tony Lindgren <tony@...mide.com>
Cc: kernel test robot <oliver.sang@...el.com>,
	Yicong Yang <yangyicong@...ilicon.com>, oe-lkp@...ts.linux.dev,
	lkp@...el.com, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable <stable@...nel.org>, linux-serial@...r.kernel.org
Subject: Re: [linus:master] [serial]  43066e3222:
 BUG:kernel_NULL_pointer_dereference,address

On Thu, Apr 04, 2024 at 09:54:15AM +0300, Tony Lindgren wrote:
> * Andy Shevchenko <andriy.shevchenko@...ux.intel.com> [240403 14:00]:
> > Probably we need to check if the port is still open...
> > 
> > P.S. AFAIU the state / xmit is invalid pointer or so.
> > 
> > Culprit line:	serial_out(up, UART_TX, xmit->buf[xmit->tail]);

xmit.buf seems to be NULL, that's why this fails.

> Maybe we can set UPF_DEAD a bit earlier as below?

Lemme perform some tests later today.

-- 
With Best Regards,
Andy Shevchenko