Pasi Kärkkäinen
2017-Sep-03 12:10 UTC
[CentOS-virt] Status of reverted Linux patch "tty: Fix ldisc crash on reopened tty", Linux 4.9 kernel frequent crashes
On Sat, Sep 02, 2017 at 08:12:53AM -0500, Johnny Hughes wrote:> On 08/30/2017 03:10 PM, Pasi K?rkk?inen wrote: > > 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. > > > > I have no issues rolling this patch in , while we wait on upstream, if > it makes our tree more stable. >I think we should do that.. What do others think? Thanks, -- Pasi
Nathan March
2017-Sep-05 17:49 UTC
[CentOS-virt] Status of reverted Linux patch "tty: Fix ldisc crash on reopened tty", Linux 4.9 kernel frequent crashes
> > I have no issues rolling this patch in , while we wait on upstream, if > > it makes our tree more stable. > > > > I think we should do that.. What do others think? >I've had the patch deployed to a group of 32 hosts (with hundreds of vms) for about 10 days now and no sign of any issues. So I support it =) Cheers, Nathan
Pasi Kärkkäinen
2017-Sep-20 08:10 UTC
[CentOS-virt] Status of reverted Linux patch "tty: Fix ldisc crash on reopened tty", Linux 4.9 kernel frequent crashes
On Tue, Sep 05, 2017 at 10:49:13AM -0700, Nathan March wrote:> > > I have no issues rolling this patch in , while we wait on upstream, if > > > it makes our tree more stable. > > > > > > > I think we should do that.. What do others think? > > > > I've had the patch deployed to a group of 32 hosts (with hundreds of vms) > for about 10 days now and no sign of any issues. > > So I support it =) >Thanks Nathan. Johnny: Can you please add the patch to next Linux 4.9 kernel build? Thanks, -- Pasi> Cheers, > Nathan
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