On Thu, 31 Aug 2017, Greg Kroah-Hartman wrote:
> On Wed, Aug 30, 2017 at 11:10:14PM +0300, 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". > > Crashes with "normal" operation, or crashes when running a fuzzer or > other type of program? I can crash it reliably (in a few tries), if I use an old Debian 5 userspace on PA-RISC. The crash happens when I connect to the machine with ssh and type something to the terminal before the prompt appears. Mikulas > > 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 don't know of anyone working on it, want to do it yourself? > > thanks, > > greg k-h >
