/srv/irclogs.ubuntu.com/2012/01/03/#ubuntu-kernel.txt

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aaschezIs it safe to have linux-headers-generic, linux-image-generic, linux, linux-headers-generic-pae, linux-headers-image-pae and linux-image installed after having linux-headers-3.0.0-14 generic?05:45
RAOFaaschez: It is (almost) always safe to have more packages than you need installed.05:51
RAOFThe more vaguely named ones (linux, linux-image-generic, etc) are metapackages; their only point is to ensure that the latest kernel is installed, even if the kernel package name changes (as it does, when you go from linux-image-3.0.0-13-generic to linux-image-3.0.0-14-generic, for example)05:52
aaschezRAOF: Certain applications require loading and compiling of modules in to running kernel, which package to instll for that?05:54
aaschezinstall05:54
RAOFlinux-headers-generic will always depend on the headers for the most recent kernel; this will not necessarily be the kernel that you're *running*, but if you keep linux-headers-generic installed and don't remove older kernel headers you'll have all the headers you need.05:55
aaschez'and don't remove older kernel headers ' ..why?05:56
aaschezAs far as I understand I'm running linux-headers-3.0.0-14-generic05:57
RAOFWell, you can select any of the previous kernels at boot.05:57
RAOFSo if you need to guarantee that any kernel you choose to run has associated headers, you need to keep the old headers around.05:57
RAOFIf, on the other hand, you only ever need to guarantee that module building will succeed against the most recent kernel, you don't need the older header packages.05:58
aaschezYes, but I think it safer to have atleast one old running kernel. Could you explain me what headers, image, generic means?05:59
aaschezs/but/so06:00
RAOFThe image is the kernel itself.  The headers are the stuff required to build out-of-tree modules against that kernel.06:03
aaschezOk, so headers are the ones required to build modules?06:03
aaschezok06:04
aaschezLastly, what is generic and generic-pae ?06:06
aaschezThanks a lot RAOF 06:10
RAOFAh.06:10
RAOF-generic-pae is a build with PAE (Physical Address Extensions) enabled.06:11
RAOFIt allows a 32bit kernel to address 48 bits of physical memory (ie: more memory than you have).06:11
RAOFI'm not sure if that's going to remain for Precise; there was talk about always having that enabled, as it only has a small performance impact.06:12
aaschezThanks for explaining me the basic terms related to kernel :)06:17
RAOFaashez: There's no problem with asking basic (relevant) questions; go ahead :)06:42
aashezRAOF: :) I just restarted after intsalling linux, linux-image-generic and linux-headers-generic packages. There was no error but when I'm trying to build kernel module it gives error06:45
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* apw looks miserably out at the world09:56
* jussi hugs apw10:13
smbjussi now is infected...10:13
jussi:(10:14
smbLuckily its "just" a cold ;)10:15
apwjussi, thanks but i don't recommend breathing near me10:16
jussiapw: colds arent catchable over the interwebs10:16
jussiso interwebs hugs are ok :D10:17
apwheres hoping you are right10:17
* LetoThe2nd suggests gluhwein to cure about everything :)10:35
apwsounds better than the honey and lemon i am being offered10:47
smbapw, how about ginger and honey. :)10:50
LetoThe2ndoO( gluhwein and gluhwein? or rather gluhwein and rum in severe cases )10:51
smbGloehwein macht gloecklich... :-P10:54
apwthat sounds rather rude :)11:09
brycehapw, only if you're a teetotaler.11:10
apwhny bryceh ... hows you11:12
* apw tries to imagine self as teetotal ... its not working11:13
brycehapw, good good11:14
brycehapw, my son and daughter share your cold11:14
bryceh(I guess)11:14
apwyay :/, that'll be amusing for you11:14
brycehapw, indeed11:14
brycehapw, invariably I'll catch it myself the day before the Budapest flight11:15
apwhense you are awake at this god forsaken time11:15
apwbryceh, so very true, hopefully it is the same one, so i am at least immune11:15
brycehcreature of the night I am11:15
apwthat seems to be the lot of fathers the world over11:15
ckingsounds like the Budapest rally will be a "share a cold virus" event11:35
brycehcking, :-/11:38
amitktalking about cold, Helsinki received its first real snowfall for the season. Much better than the wet greyness.11:38
ckingshare and enjoy ;-)11:38
ppisatiwe should rename Canonical's event after a famous Anthrax album: "Spreading the disease"!11:39
amitkthere is already 'ubuflu' which is a take away gift from the events :)11:40
ckingubuflu is something also free to share with the family when you get back home11:41
amitk...hence sticking to the spirit of ubuntu ;)11:42
ckingapart from the fact we don't get the source code to the cold virus 11:43
amitkcking: the source is available. We just don't know the programming language yet11:43
* cking consideres objdump on a virus...11:44
apwherton, bjf, ppisati, i have found a build error in maverick/ti-omap4, in the unreleased bit so i want to force the tip to fix it ... any of you playing with it?12:48
bjfapw, not I12:48
apwbjf, happy new year ... early for you isn't it ?12:49
hertonapw, no as well12:49
apwthen as ppisati can't be pushing it, i can ;)12:49
bjfapw, same to you. Yes, woke up at 3, couldn't get back to sleep12:49
apwbjf, now that sucks and no mistake12:49
apwherton, bjf, pushed ... was a missing header include in the top-down patches, now fixed12:52
* apw notes he is beign pretty random about who he is wishing new years to, strange ...12:55
apwhappy new years all round12:55
cking#include <happynewyear.h>13:03
ppisatiapw: not messing with m/omap413:04
ppisatiapw: *i'm13:04
apwppisati, thanks, all updated now13:04
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ppisatiback in 20m14:52
apwppisati, p/ti-omap4 is now a rebase tree against p/master-next right ?15:41
* ogasawara back in 2015:49
ppisatiapw: yep15:59
apwppisati, cool thanks16:00
apwjsalisbury, we got a top 10 meeting shortly ?16:00
jsalisburyapw, yes16:00
jsalisburyapw, 30 minutes16:01
apwack16:01
ppisatiisn't it 30min before kernel meeting?16:01
jsalisburyppetraki, correct16:02
jsalisburyAnd on that note:16:02
jsalisbury**16:02
jsalisbury** Ubuntu Kernel Team Meeting - Today @ 17:00 UTC - #ubuntu-meeting16:02
jsalisbury**16:02
smbppisati, I would say 1hr16:02
jsalisburysorry ppetraki, I meant ppisati correct.16:02
ppetrakijsalisbury, happens a lot :), hny16:03
jsalisbury:)16:03
smboh the top ten thing...16:03
brendandanyone here from the stable team?16:09
hertonbrendand, yes16:09
brendandherton - hi16:09
hertonhi16:11
brendandherton - we're considering re-testing for oneiric because of the reverted patch. the reversion seems to have fixed what looked like a seperate issue as well, so it seems significant16:11
hertonbrendand, yes, re-testing is needed, although it's a small change has considerable impact16:13
bjf[afk]brendand, can you explain what the "separate issue" is that it fixed ?16:15
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brendandbjf[afk] - this one https://bugs.launchpad.net/ubuntu/+source/linux/+bug/90745416:16
ubot2`Launchpad bug 907454 in linux "[Dell Precision M4500] offlining and then re-onlining CPUs makes the system unresponsive" [Medium,Confirmed]16:16
brendandwe had one other independent confirmation16:16
bjfbrendand, thanks, that is interesting16:17
tgardnerbjf, given that suspend offlines CPUs, I think this is likely the same symptom.16:17
bjftgardner: that was what I was thinking as well16:18
brendandbjf - now my colleague tells me that the system hit by that bug also couldn't resume from S3 so it seems almost certain they're related16:21
bjfbrendand: did they run into the issue as part of cert. testing ?16:23
brendandbjf - yep, sure did16:27
bjfbrendand: i'm "curious" why it didn't get raised with us (or did it?)16:28
brendandafair i did mention it here before the holidays16:30
bjfbrendand: thanks16:31
brendandbjf - the bug also has the regression-update tag. does that not bring it into view for you?16:32
bjfbrendand, no, at this point that tag is on so many bugs it's useless16:33
diwicogasawara, just a question, can I really cherry-pick to the precise kernel? I mean, the stuff that currently is in takashi's tree only, not in linus tree, and therefore not in the precise tree, and you cannot cherrypick between different trees, or can you?16:33
ogasawaradiwic: I believe if you fetch takashi's tree you should be able to cherry-pick16:35
diwicogasawara, hmm, so I would start with a precise tree and then "git remote add" for takashi's tree?16:35
argesjsalisbury, whats the link?16:37
jsalisburyarges, http://reports.qa.ubuntu.com/reports/kernel-bugs/reports/_kernel_hot_.html16:37
argesthanks16:37
jsalisburyarges, Then sort by heat16:37
argesok I was looking at the right page then16:37
ogasawaradiwic: you could do that or I think you can just do 'git fetch ...'16:38
diwicogasawara, ok, I'll try that. Thanks!16:38
ogasawaradiwic: a lot of times I do "git fetch <repo> <branch>" and then just "git cherry-pick FETCH_HEAD" (assuming the patch I want is at the tip)16:40
jonohey all16:50
jonomy wireless keeps dropping and dmesg is giving me a stack of [21740.360855] wlan0: deauthenticating from 3c:ea:4f:85:07:d1 by local choice (reason=3)16:50
jono errors16:50
jonoit looks like I get that error whenever it disconnects16:51
jonoany idea what the possible cause could be?16:51
apwjono, does that happen randomly a few times a day ?16:52
jonoapw, yeah16:52
jonoit seems to be happening at least once an hour16:52
apwwhat wireless do you have ?16:52
jonocfg8021116:52
jonoIntel16:52
apwjono, sounds like what i am seeing, where likely rekeying is being exposed16:52
apwbut no idea as to cause, why are you seeing it all of a sudden?16:53
jonoI saw a few bugs in LP that suggest others are seeing this too16:53
jonoapw, I have seen this ever since I upgraded to 12.0416:53
jonooddly, it varies between APs I think16:53
jonosee these issues with my AP, but less with my parents16:53
jonoI thought it might be the power saving, but that is off on my machine16:53
apwjono, yep i'd say there is an ap component.  but rekeying time is AP specific16:54
apwi started seeing it when i upgraded my AP to WPA16:54
jonowhat is rekeying time?16:54
apwwpa requires rekeying (making up new keys) effectivly a reassociation though it should be transparent16:55
jonoright16:55
jonoso does the AP basically kick me off the AP and then it should automatically create the new key and connect?16:55
apwjono, i am unsure as to what should happen, the 'error' whcih is reported implies that the local end decided it wanted off the AP16:56
jonoapw, the bug I saw reported was https://bugs.launchpad.net/ubuntu/+source/linux/+bug/548992 and 16:58
ubot2`Launchpad bug 548992 in debian "Wireless connection frequently drops [deauthenticating by local choice (reason=3)]" [Undecided,Confirmed]16:58
brendandbjf - what's going to happen with https://bugs.launchpad.net/ubuntu/+source/linux/+bug/910894 then? how long is it staying in verification for?17:08
ubot2`Launchpad bug 910894 in kernel-sru-workflow/verification-testing "linux: 3.0.0-15.25 -proposed tracker" [Undecided,In progress]17:08
argesjsalisbury, i was wondering why https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/836250 wasn't high in heat... but I think its because its been updated recently perhaps17:11
ubot2`Launchpad bug 836250 in linux "[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor networking, packet loss and very slow Lenovo X201 and T500 laptops" [Critical,In progress]17:11
bjfbrendand, good question. I guess I'd like to see it stay in verification this week17:11
jsalisburyarges, that's a good question.  17:12
brendandbjf - so we'll leave our retesting for next week then i guess17:15
bjfbrendand, i think it would be safe to test this week if you wanted 17:24
tgardnerbjf, Greg has added 'Revert "clockevents: Set noop handler in clockevents_exchange_device()' to all of the maintained stable trees beginning with 2.6.32.y17:43
bjftgardner: ack, herton, we should revert and respin17:45
bjftgardner: only lucid has the bad commit, we'll respin that17:58
tgardnerbjf, right.17:58
jonoapw, is there anything I can do to resolve this wireless dropping issue, it is disrupting my work18:06
jonoknow of any workarounds?18:06
tgardnerjono, ethernet18:06
jonotgardner, I might need to do that18:07
apwjono, no i have yet to find anything that helps18:07
jonono worries, thanks for looking into apw18:07
jonoobviously if you want to look at my machine in budapest, that is fine18:07
tgardnerjono, I'm stuck on Maverick on one of my laptops 'cause wireless just goes to hell with a newer kernel18:07
jonotgardner, yikes18:07
jonotgardner, you having the same dropouts issues?18:08
apwjono, i have the same issue on my natty box at home, thats the first time i noticed it, but also the first time i had wpa, which is uspect has always been broke in this way18:08
tgardnerapw, try Maverick with WPA. I think you'll find that works OK18:08
jonoapw, gotcha18:09
apwtgardner, yeah i had moved forword from M before i moved to wpa, will try that out when i get back to the machine18:10
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apwtgardner, and i am not sure its limited to intel, so i suspect this is either a 80211 stack issue, or an NM issue18:12
tgardnerapw, Johannes Burg has been working on this with arges since before Xmas. dunno what that status is, but I agree that it looks like a stack issue.18:13
argestgardner, yea I built a test kernel with Johannes patch to get some debug info. he was looking at the tx/rx aggregation code in the kernel18:14
hertontgardner, I noticed that smb announced 2.6.32.52+drm33.21 with only the clockevents revert, I'll apply it as a stable update (create-stable-tracker)18:15
argestgardner, unfortunately I'm not sure that bug is just *1* issue, it seems like there could be multiple issues at work18:15
tgardnerherton, good, was just gonna ask about that18:16
smbherton, Yeah, Greg just did the same18:16
tgardnerarges, it seems power saving mode is wadded up in the general symptoms18:16
apwarges, if you have some test kernels, or patches point me at them and i can try them on my kit18:16
jonotgardner, yeah I thought it was the power saving issues, but I switched off power saving and the issues are still there18:17
argesapw, do you have a wifi card that exhibits the issue?18:17
apwarges, i have two machines at least which show this behaviour in my home yes18:17
tgardnerarges, you can also abuse jono18:17
jonobring it!18:17
argesawesome18:17
apwi think i have three, which are the three i use routinely, so it could be more18:17
argeshttps://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/83625018:18
ubot2`Launchpad bug 836250 in linux "[Oneiric] [Regression] Intel Corporation Centrino Ultimate-N 6300 poor networking, packet loss and very slow Lenovo X201 and T500 laptops" [Critical,In progress]18:18
jonobrb, nipping out to get some longer ethernet18:18
smbherton, I wonder whether in this special case I could wait till tomorrow and then use the current make ec2 topic branch tracking bug created today which I have not touched, yet...18:18
* smb is lazy18:18
argesapw, jono: #124 has a build with gives us multiple options for disabling n mode in the kernel18:18
hertonsmb, yes, just ignore the current tracking bug, the bot will open a new one after the build of new kernel18:18
bjfsmb, i'm ok with that18:18
apwarges, i don't thnk i have any N capable kit involved18:19
argesJohannes Berg wanted to know how those various parameters related18:19
argesapw, oh, which card(s) do you have that would relate to this?18:19
smbherton, bjf Oh, if the bot creates a new one anyway... I take whatever is latest then18:19
apwsomething intel, and something brcm at least18:19
apwi haven't got the h/w in hand right not, but my constant disconnects is occuring at home18:20
argesapw, ok this is a different bug than I've been looking at18:20
smbogasawara, actually I guess you may be interested to be aware of bug 911204, too. Not sure the change I have in there will be embraced but it seems to help the xen case...18:21
ubot2`Launchpad bug 911204 in linux "precise ec2 images fail to boot with kernel oops" [Critical,Confirmed] https://launchpad.net/bugs/91120418:21
ogasawarasmb: ack18:21
argesapw, essentially wifi worked in natty, then stopped working in oneiric. in oneiric if n mode is disabled (11n_disable=1) wireless works again.   the periodic disconnections sounds pretty different18:22
ogasawarasmb: you plan on shooting that upstream?18:24
smbogasawara, Yes, sent it already. Though rather to the stable with both from the sob cc'ed. I found that thread more quickly18:25
apwsmb, we shall see what they say i gues18:26
smbapw, Right, if there is no response I need to shoot wider18:26
ogasawarasmb: I'll apply it as sauce for now and we can follow up later18:27
smbJust was meant as a note to let you know.18:27
smbogasawara, Hmmmm. Maybe I should test on real hw before...18:28
ogasawarasmb: oh, I thought you had tested18:28
smbJust booted as a xen guest18:28
smbwhich failed before...18:28
smbogasawara, So let me do the proper testing18:29
ogasawarasmb: ack18:29
tgardnerogasawara, where did 'fs: limit filesystem stacking depth' come from in Precise ?18:33
ogasawaratgardner: hrm, don't recall off the top of my head.  just a sec and lemme look.18:33
tgardnerogasawara, it ain't upstream, so I was kind of curious18:33
ogasawaratgardner: ah, I think that's part of the overlayfs bits18:34
tgardnerah18:34
tgardnerogasawara, perhaps we should have marked those SAUCE or somethinig18:34
ogasawaratgardner: I think we'd prefixed those with "overlayfs:" or something similar.  I'll get em cleaned up and marked sauce 18:35
tgardnerogasawara, I noticed it whilst reviewing tyhicks statfs reporting patch.18:37
tyhicksyes, I remember seeing that patch in the overlayfs patchset18:41
tyhickstgardner, ogasawara: FWIW, the eCryptfs changes looked good to me18:42
tgardnertyhicks, is the patch on the mailing list the same as whats in linux-next ?18:43
tyhickstgardner: BTW, I've got a working statfs reporting patch with a single code path. I just need a little time to go back and clean some things up.18:43
tyhickstgardner: Sorry, are you talking about the eCryptfs patch in the overlayfs patchset or the eCryptfs statfs patch?18:44
tgardnertyhicks, the statfs patch on the Ubuntu k-team list18:44
tgardnerI was just about to push that one. despite our comments it does work.18:45
tyhickstgardner: The statfs patch in linux-next and the Ubuntu k-team list are the same. I'm working on an improved version for the 3.3 merge window.18:45
tyhickstgardner: It will incorporate the changes suggested by you and apw18:46
tgardnertyhicks, ok, then I'll push the one I've got.18:46
tyhickssounds good, thanks18:46
tgardnertyhicks, I'm still getting hate mail about bug #509180. Have you review it recently ?19:16
ubot2`Launchpad bug 509180 in ecryptfs "ecryptfs sometimes seems to add trailing garbage to encrypted files" [High,Fix released] https://launchpad.net/bugs/50918019:16
tyhickstgardner: Yes. A lot of those comments are not helpful, but I looked at a bug yesterday which had helpful steps to reproduce the issue - bug 84264719:27
ubot2`Launchpad bug 842647 in ecryptfs "[git] file blocks duplicated at the end of the file" [High,In progress] https://launchpad.net/bugs/84264719:27
tyhickstgardner: I'm almost done with that patch. It should go upstream by the end of the week.19:28
tgardnertyhicks, cool. if it looks like the same symptoms, then mark 509180 as a duplicate when you've got a patch ready to go.19:29
* tgardner --> lunchtime errands19:29
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apwtgardner-afk, bah ... we need to fix the 'going to apply' protocol ... we just clashed :)19:35
lamontI have a few Dell poweredge machines that have recently started seeing ntp step back and forth OTOO .2 seconds... any known fuzziness in the kernel's ntp world?19:36
lamont(lucid and hardy both, so I'm suspecting that the hardware is just plain getting old)19:37
lamontjust wondering if the ticks/sec there is consistent with other machines, or if said hardware has something special of its own19:48
=== jsalisbury changed the topic of #ubuntu-kernel to: Home: https://wiki.ubuntu.com/Kernel/ || Ubuntu Kernel Team Meeting - Tues Jan 17, 2012 - 17:00 UTC || If you have a question just ask, and do wait around for an answer!
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* herton -> eod20:18
=== bjf[afk] is now known as bjf
BeanowOh wow, accidentally changed status of a bug I had nothing to do with.21:16
Beanowhttps://bugs.launchpad.net/ubuntu/+source/linux/+bug/90456921:16
ubot2`Launchpad bug 904569 in linux "Linux 3.0.0-15 causes laptops to fail to resume from suspend (Dell XPS 1645, Sony Vaio VPCF1390)" [Medium,Fix released]21:16
BeanowAnyone in here that can revert Oneiric status to Fix Commited?21:17
bjfBeanow: done21:18
ohsixsomeone that can will see the change and fix it, most likely21:18
BeanowThanks and apologies.21:18
Beanow(How do I even have permission for that?)21:19
Beanowjsalisbury: just reading back on the first kernel meeting I saw. I'm impressed. Neatly organized.21:30
jsalisburyBeanow, thanks, glad the notes can help21:30
Beanowjsalisbury, actually got it in my chat here but pretty much the same thing21:31
BeanowAnd yeah they helped. Now I know my suspend problem is going to be fixed quickly. :P21:32
jsalisburyBeanow, yes, the commit that caused the bug has been identified.21:36

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