Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
On Wed, Apr 23, 2008 at 04:25:43AM -, QuentinHartman wrote: @Colin King: On my machine I have hpet, acpi_pm, jiffies, and tsc as available clock sources. hpet seems to be the default. Here are my results using the daily from the 21st (I think...) hpet: stalls acpi_pm: stalls (perhaps worse than hpet) jiffies: Works! If this does not eliminate the stalls, it at least makes them so short they are easily confused with normal processing tsc: stalls really badly, worse than hpet or acpi_pm I'm going to test jiffies a couple more times, but the one run though worked great! Remember that this is on real hardware, not KVM! The problem originally described in this bug report has been isolated, and found to be specific to KVM, thus yours is not the same bug. Please move discussion of your problem back to the bug report you filed (#217849) to avoid confusion. -- - mdz -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
On Mon, Apr 21, 2008 at 09:19:23PM -, Colin Watson wrote: Derek: There's no screensaver in d-i. Screen blanking is a distant possibility, though. The default screen blanking interval set by the kernel is 10 minutes, and d-i doesn't change this; if the failure happens after 10 minutes (or nearby, to allow for possible clock skew inside kvm) then that would provide some circumstantial support for this. If that were the case, I'd expect the progress bar to jump if it was paused for a few minutes, though no one has mentioned that. -- - mdz -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Server Team, which is a direct subscriber. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
On Mon, Apr 21, 2008 at 09:19:23PM -, Colin Watson wrote: Derek: There's no screensaver in d-i. Screen blanking is a distant possibility, though. The default screen blanking interval set by the kernel is 10 minutes, and d-i doesn't change this; if the failure happens after 10 minutes (or nearby, to allow for possible clock skew inside kvm) then that would provide some circumstantial support for this. If that were the case, I'd expect the progress bar to jump if it was paused for a few minutes, though no one has mentioned that. -- - mdz -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
On Tue, Apr 22, 2008 at 4:26 AM, Colin King [EMAIL PROTECTED] wrote: It maybe worth booting with clocksource set to one of the alternative clocksources available on your machine. One can see which clocksources are available using: cat /sys/devices/system/clocksource/clocksource0/available_clocksource and then boot with clocksource=xxx (where xxx is one of the clocksoures). I cannot test this as I don't have the ability to run kvm on my hardware setup here. Can somebody try this and checks if it helps or not. I'll try using different clock sources tonight. -- -Regards- -Quentin Hartman- ** Attachment added: unnamed http://launchpadlibrarian.net/13825761/unnamed -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
On Mon, Apr 21, 2008 at 10:13 AM, davmor2 [EMAIL PROTECTED] wrote: There is no fault on the test I just ran using the image 20080421 on hardware. If possible could the original report please test and see if he still has the issue with the new cd? I am downloading the that ISO now, I will run it on my problem machine and report back tonight. -- -Regards- -Quentin Hartman- ** Attachment added: unnamed http://launchpadlibrarian.net/13653944/unnamed -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Server Team, which is a direct subscriber. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
On Mon, Apr 21, 2008 at 7:16 PM, Soren Hansen [EMAIL PROTECTED] wrote: If further testing reveals that disabling the tsc actually helps, I've prepared a kernel patch that will fix it for us: http://kernel.ubuntu.com/git?p=soren/ubuntu- hardy.git;a=commit;h=c472835957c7bce42c56aa2c57caa2e80a5bdb1a Mind you, the code is completely untested (it's getting rather late here), but it looks plausible. Well I tested this on my machine here and I still see the problem, though with notsc it seems less frequent. I'm concerned that may be wishful thinking on my part. I have noticed a new behavior where the install red-screen fails during the selecting and installing packages bit towards the end of the install. I get a stall like before, but this time when I hit a key to continue, rather than carrying it, it drops me out to the red screen. Even if I go go back a few steps in the install process, it keeps giving me a red screen A installation step has failed or the like. I need to do some more testing and see if I can get it to reliably correlate to something I'm changing, but as you pointed out, it's getting late here too... -- -Regards- -Quentin Hartman- ** Attachment added: unnamed http://launchpadlibrarian.net/13777800/unnamed -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Server Team, which is a direct subscriber. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
On Mon, Apr 21, 2008 at 10:21:46AM -, Colin King wrote: A couple of points worth mulling over to corner this one.. 1. Is the hanging a function of memory size - for example, the buffer cache filling up after a certain amount of time and then pdflush kicking in very aggressively doing dirty data writing backs as fast as it can. In which case, one may see the system resume again after a (long) period of time once pdflush is complete. It may be worth tweaking with the /proc/sys/vm/dirty* options to see if this trips the problem more frequently. Also, it may be worth seeing if doing the install with small memory kvm virtual machines shows this problem earlier than large memory virtual machines just to see if it is a buffer cache write back cpu starvation issue. 2. From my understanding dd is being used to zero the encrypted disk. Does changing the dd block size to a very large size trip this bug earlier as one gets more throughput than the normal (small) block size default? It's a custom program, actually, blockdev-wipe (in the partman-crypto package). 3. Is the hanging resumed by an external interrupt (keyboard, mouse) because of the scheduler boosts interactive sessions temporarily and hence interfering (in a positive way) to the balancing of the encryption kernel space thread, dd and pdflush? Note also that there are reports of similar behaviour in other parts of the installer, which aren't necessarily as I/O intensive. -- - mdz -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
On Mon, Apr 21, 2008 at 10:13 AM, davmor2 [EMAIL PROTECTED] wrote: There is no fault on the test I just ran using the image 20080421 on hardware. If possible could the original report please test and see if he still has the issue with the new cd? I am downloading the that ISO now, I will run it on my problem machine and report back tonight. -- -Regards- -Quentin Hartman- ** Attachment added: unnamed http://launchpadlibrarian.net/13653944/unnamed -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
On Mon, Apr 21, 2008 at 7:16 PM, Soren Hansen [EMAIL PROTECTED] wrote: If further testing reveals that disabling the tsc actually helps, I've prepared a kernel patch that will fix it for us: http://kernel.ubuntu.com/git?p=soren/ubuntu- hardy.git;a=commit;h=c472835957c7bce42c56aa2c57caa2e80a5bdb1a Mind you, the code is completely untested (it's getting rather late here), but it looks plausible. Well I tested this on my machine here and I still see the problem, though with notsc it seems less frequent. I'm concerned that may be wishful thinking on my part. I have noticed a new behavior where the install red-screen fails during the selecting and installing packages bit towards the end of the install. I get a stall like before, but this time when I hit a key to continue, rather than carrying it, it drops me out to the red screen. Even if I go go back a few steps in the install process, it keeps giving me a red screen A installation step has failed or the like. I need to do some more testing and see if I can get it to reliably correlate to something I'm changing, but as you pointed out, it's getting late here too... -- -Regards- -Quentin Hartman- ** Attachment added: unnamed http://launchpadlibrarian.net/13777800/unnamed -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
Current thinking is that there are probably two separate issues here: 1. A problem specific to the KVM virtual environment 2. A problem specific to a particular hardware type. As such, I've un-duped bug 217849. -- - mdz -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
On Fri, Apr 18, 2008 at 10:28 AM, Dustin Kirkland [EMAIL PROTECTED] wrote: So thinking much earlier in the installer, anything come to mind? Particularly something that might have been added since Gutsy as we now believe this is a regression? The only thing I can think of that should be relying on entropy would be the lvm-crypt and disk-wiping stuff that goes along with it, and this problem gets triggered even when those aren't in use. -- -Regards- -Quentin Hartman- -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 217815] Re: Installation stalls randomly until a key is pressed
On Fri, Apr 18, 2008 at 06:24:50PM -, Rick Clark wrote: I think we can consider kvm a hardware type for these purposes. Only if the bug is in the guest kernel. This could be an issue with KVM itself, or with the host side. -- - mdz -- Installation stalls randomly until a key is pressed https://bugs.launchpad.net/bugs/217815 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
