From: "Pasi Kärkkäinen" <pasik@iki.fi>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Michael Neuling <mikey@neuling.org>,
Dmitry Vyukov <dvyukov@google.com>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Peter Hurley <peter@hurleysoftware.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Nathan March <nathan@gt.net>,
centos-virt@centos.org, linux-kernel@vger.kernel.org
Subject: Status of reverted Linux patch "tty: Fix ldisc crash on reopened tty", Linux 4.9 kernel frequent crashes
Date: Wed, 30 Aug 2017 23:10:14 +0300 [thread overview]
Message-ID: <20170830201014.GO4090@reaktio.net> (raw)
Hello everyone,
Recently Nathan March reported on centos-virt list he's getting frequent Linux kernel crashes with Linux 4.9 LTS kernel because of the missing patch "tty: Fix ldisc crash on reopened tty".
The patch was already merged upstream here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=71472fa9c52b1da27663c275d416d8654b905f05
but then reverted here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=896d81fefe5d1919537db2c2150ab6384e4a6610
Nathan confirmed if he applies the patch from 71472fa9c52b1da27663c275d416d8654b905f05 to his Linux 4.9 LTS kernel the bug/problem goes away, so the patch (or similar fix) is still needed, at least for 4.9 LTS kernel.
Mikulas reported he's able to trigger the same crash on Linux 4.10:
https://www.spinics.net/lists/kernel/msg2440637.html
https://lists.gt.net/linux/kernel/2664604?search_string=ldisc%20reopened;#2664604
Michael Neuling reported he's able to trigger the bug on PowerPC:
https://lkml.org/lkml/2017/3/10/1582
So now the question is.. is anyone currently working on getting this patch fixed and applied upstream? I think one of the problems earlier was being able to reliable reproduce the crash.. Nathan says he's able to reproduce it many times per week on his environment on x86_64.
Thanks a lot,
-- Pasi
next reply other threads:[~2017-08-30 20:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-30 20:10 Pasi Kärkkäinen [this message]
2017-08-31 4:36 ` Status of reverted Linux patch "tty: Fix ldisc crash on reopened tty", Linux 4.9 kernel frequent crashes Greg Kroah-Hartman
2017-08-31 5:22 ` Michael Neuling
2017-09-01 12:59 ` Pasi Kärkkäinen
2017-09-01 20:48 ` Mikulas Patocka
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