I am surprised to see no one else post on this. I would think a massive regression that prevents mono from running multi-threaded code on a multi-cpu system (including in the future on any v4 kernel) might be an issue that people would be concerned about?!
On Thu, Sep 17, 2015 at 4:03 PM, Greg Young <gregoryyou...@gmail.com> wrote: > So to follow up on this. > > The fix that was put in for this has since been reverted as mentioned > in the bug above. > > https://github.com/torvalds/linux/commit/73459e2a1ada09a68c02cc5b73f3116fc8194b3d > > So all 4 kernels will have this issue. I'm not really sure what needs > to be done on the mono side here to avoid this issue but it would seem > to affect any multi-threaded code running on multiple cpu linux > systems (which I would imagine would be a vast majority of mono > installations). > > Greg > > On Thu, Sep 17, 2015 at 1:05 PM, Greg Young <gregoryyou...@gmail.com> wrote: >> I was just actually writing that this seems to be discussed here: >> https://bugzilla.xamarin.com/show_bug.cgi?id=29692 :) Thanks for the >> additional information. >> >> >> >> On Thu, Sep 17, 2015 at 1:01 PM, Taloth Saldono <talothsald...@gmail.com> >> wrote: >>> This Ubuntu bug discusses the issue for 3.13. >>> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1450584 >>> >>> Please note that later kernel 4.0 versions exhibit similar issues, search >>> this mailinglist for specifics on that new regression. I gave up on >>> investigating further due to other obligations and the complexity of the >>> subject matter. >>> >>> Op 17 sep. 2015 11:49 schreef "Greg Young" <gregoryyou...@gmail.com>: >>>> >>>> 3.13.0-63-generic does not have the issue as well. >>>> >>>> I guess our mitigation will just be to know about the issue and >>>> suggest downgrade/upgrade. This may however be useful for others in >>>> the future. Mono 3.12.1 on 3.13.0-46-generic #77-Ubuntu SMP appears to >>>> not be stable. We will also test mono4 now. >>>> >>>> Greg >>>> >>>> On Thu, Sep 17, 2015 at 11:38 AM, Greg Young <gregoryyou...@gmail.com> >>>> wrote: >>>> > We are running into some interesting regressions with mono. We are >>>> > seeing many failures such as: >>>> > >>>> > Mono v3.12.1 (we have considered moving up to 4.1 or 4.2 but the last >>>> > time we tested it didn't seem safe to move). >>>> > >>>> > Native stacktrace: >>>> > >>>> > /home/ubuntu/EventStore-OSS-Ubuntu-v3.2.1/eventstored() [0x609a4f] >>>> > /home/ubuntu/EventStore-OSS-Ubuntu-v3.2.1/eventstored() [0x5bdecf] >>>> > /home/ubuntu/EventStore-OSS-Ubuntu-v3.2.1/eventstored() [0x453b19] >>>> > /lib/x86_64-linux-gnu/libpthread.so.0(+0x10340) [0x7fd9709b7340] >>>> > /home/ubuntu/EventStore-OSS-Ubuntu-v3.2.1/eventstored() [0x4e6145] >>>> > [0x40e21ceb] >>>> > >>>> > >>>> > [03041,21,13:43:11.379] Global Unhandled Exception occurred. >>>> > Object reference not set to an instance of an object >>>> > [ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: >>>> > Object reference not set to an instance of an object >>>> > at EventStore.Core.Bus.QueuedHandlerAutoReset.ReadFromQueue >>>> > (System.Object o) [0x00000] in <filename unknown>:0 >>>> > at System.Threading.Thread.StartInternal () [0x00000] in <filename >>>> > unknown>:0 >>>> > >>>> > note that this isn't a real nre >>>> > >>>> > We do not see these regressions in Linux ip-172-31-37-60 >>>> > 3.13.0-46-generic #77-Ubuntu SMP >>>> > >>>> > We do see them in Linux ip-172-31-40-115 3.13.0-48-generic #80-Ubuntu >>>> > SMP >>>> > >>>> > Anyone have any ideas how to debug this further? These are not >>>> > deterministic issues. >>>> > >>>> > Cheers, >>>> > >>>> > Greg >>>> > >>>> > -- >>>> > Studying for the Turing test >>>> >>>> >>>> >>>> -- >>>> Studying for the Turing test >>>> _______________________________________________ >>>> Mono-devel-list mailing list >>>> Mono-devel-list@lists.ximian.com >>>> http://lists.ximian.com/mailman/listinfo/mono-devel-list >> >> >> >> -- >> Studying for the Turing test > > > > -- > Studying for the Turing test -- Studying for the Turing test _______________________________________________ Mono-devel-list mailing list Mono-devel-list@lists.ximian.com http://lists.ximian.com/mailman/listinfo/mono-devel-list