From mboxrd@z Thu Jan 1 00:00:00 1970 From: jordan Subject: Re: BUG: spinlock trylock failure on UP - reverting timer patches helps Date: Fri, 18 Apr 2014 11:09:16 -0400 Message-ID: References: <534C3606.7010206@meduna.org> <534C731F.1050406@meduna.org> <534DADF1.6060608@meduna.org> <53500184.4050309@meduna.org> <53505BD7.9050004@meduna.org> <53513A7E.5050907@meduna.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Cc: "linux-rt-users@vger.kernel.org" , Linux ARM Kernel , "linux-kernel@vger.kernel.org" , Sebastian Andrzej Siewior , Steven Rostedt , Thomas Gleixner To: Stanislav Meduna Return-path: In-Reply-To: <53513A7E.5050907@meduna.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org Hey slavo > many thanks for the tests. I probably botched something during > the reverting - I now tried some more experiments and the system > now runs without BUGs and without kernel leak - of course > it needs some more uptime to be really sure. No problem. It's good to hear that is working. My AMD Phenom II 965 has 1day, 10hours uptime. Hopefully that foreshadows your system running well. > My combined revert patch from 3.12.15-rt25 is at > http://pastebin.com/MYLqbmZw > That was all that was needed. Yup. I suggest anyone from the list who can't get their machines to boot with those commits applied, test that patch. >> Yeah, i know a handful of people [amd users] that have now reported >> success booting into 3.14-rt1 reverting those patches. Personally, I >> have disabled NO_HZ_FULL and have switched back to 'old tick' method >> in kconfig. I don't think the latest no_hz stuff is stable enough... > > My problems were with periodic timers (I am on an embedded system > that runs things periodically anyway and I have also my doubts > regarding the stability), so the latest code did not break > only NO_HZ_FULL. ah, thanks for the clarification [ i must have missed that bit - i was just glad someone else had verified on the list that those commits were problematic, as i hadn't gotten any response]. NO_HZ_FULL had been alright for me, for a while - so i didn't really notice the breakage with periodic timers, but that is good to know. I think periodic timers + reverting those patches + resurrecting sirq threads on seems to be the best on 3.14-rt, afaict. Jordan > Thanks > -- > Stano >