Am Montag, 25. November 2013, 16:32:19 schrieb Boaz Harrosh: > On 11/25/2013 04:15 PM, Richard Weinberger wrote: > > On Fri, Nov 22, 2013 at 7:02 AM, Yuanhan Liu > > > > <yuanhan.liu@xxxxxxxxxxxxxxx> wrote: > >> Greetings, > >> > >> I got the below dmesg and the first bad commit is > >> > >> commit 20545536cd8ea949c61527b6395ec8c0d2c237b1 > >> Author: Boaz Harrosh <bharrosh@xxxxxxxxxxx> > >> Date: Thu Jul 19 15:22:37 2012 +0300 > >> > >> RFC: do_xor_speed Broken on UML do to jiffies > >> > >> Remember that hang I reported a while back on UML. Well > >> I'm at it again, and it still hangs and I found why. > >> > >> I have dprinted jiffies and it never advances during the > >> loop at do_xor_speed. There for it is stuck in an endless > >> loop. I have also dprinted current_kernel_time() and it > >> returns the same constant value as well. > >> > >> Note that it does usually work on UML, only during > >> the modprobe of xor.ko while that test is running. It looks > >> like some lucking is preventing the clock from ticking. > >> > >> However ktime_get_ts does work for me so I changed the code > >> as below, so I can work. See how I put several safety > >> guards, to never get hangs again. > >> And I think my time based approach is more accurate then > >> previous system. > >> > >> UML guys please investigate the jiffies issue? what is > >> xor.ko not doing right? > > > > This patch never hit my mailbox... > > > >> Signed-off-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx> > > Sir Richard > > I never followed on this patch. Sorry. I do think it is in > the right direction, but it has a dev-by-zero problem and > a 32 bitness problem. (So I never sent it, beyond the initial > query) > > [It stopped to be very important for me since I stopped using > UM very much. Ever since FC17 I'm unable to produce a running > image. It just will not boot, an image that a kvm would. So > very sad me, but no UML for me anymore.] Sad to hear. Did you try one from http://fs.devloop.org.uk/? Just booted a FC18 on UML. Works fine. In the past we've had some issues with systemd-enabled distros. systemd uncovered problem in the UML tty driver. > If you want to investigate. try doing a modprobe xor.ko on > a uml and see. since xor.ko is only built on demand for example > enabling exofs or object-layout-driver will select it. ,or MD-raid5. Ok. Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
