On 08/30/2017 03:10 PM, Pasi Kärkkäinen 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/?i...
but then reverted here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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;#26...
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.