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Date: Tue, 3 Dec 2019 10:17:08 -0500 (EST) From: Mikulas Patocka <mpatocka@...hat.com> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org> cc: Mike Kravetz <mike.kravetz@...cle.com>, Daniel Axtens <dja@...ens.net>, Michael Neuling <mikey@...ling.org>, Peter Hurley <peter@...leysoftware.com>, Jiri Slaby <jslaby@...e.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: tty crash in Linux 4.6 On Sat, 16 Nov 2019, Greg Kroah-Hartman wrote: > On Fri, Nov 15, 2019 at 11:21:08AM -0800, Mike Kravetz wrote: > > On 4/11/18 9:09 AM, Daniel Axtens wrote: > > > Mikulas Patocka <mpatocka@...hat.com> writes: > > > > > >> On Thu, 22 Mar 2018, Greg Kroah-Hartman wrote: > > >> > > >>> On Fri, Mar 23, 2018 at 12:48:06AM +1100, Daniel Axtens wrote: > > >>>> Hi, > > >>>> > > >>>>>> This patch works, I've had no tty crashes since applying it. > > >>>>>> > > >>>>>> I've seen that you haven't sent this patch yet to Linux-4.7-rc and > > >>>>>> Linux-4.6-stable. Will you? Or did you create a different patch? > > >>>>> > > >>>>> We are hitting this now on powerpc. This patch never seemed to make > > >>>>> it upstream (drivers/tty/tty_ldisc.c hasn't been touched in 1 year). > > >>>> > > >>>> I seem to be hitting this too on a kernel that has the 4.6 changes > > >>>> backported to 4.4. > > >>>> > > >>>> Has there been any further progress on getting this accepted? > > >>> > > >>> Can you try applying 28b0f8a6962a ("tty: make n_tty_read() always abort > > >>> if hangup is in progress") to see if that helps out or not? > > > > > > Sorry for the delay in getting the test results; as with Mikulas, > > > 28b0f8a6962a does not help. > > > > > > Regards, > > > Daniel > > > > > >>> > > >>> thanks, > > >>> > > >>> greg k-h > > >> > > >> It doesn't help. I get the same crash as before. > > >> > > >> Mikulas > > > > Reviving a really old thread. > > > > It looks like this patch never got merged. > > I do not see a patch in this email, so I have no idea what you are > referring to, sorry. > > > Did it get resolved in some other way? I ask because we have a > > customer who seems to have hit this issue. > > Can you try with the latest kernel to see if it is resolved or not? I tested it on the kernel 5.4 and I couldn't reproduce the crash anymore. Mikulas > thanks, > > greg k-h >
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