| cyking | i find these instructions a bit ambiguous https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1453391/comments/14 | 09:40 |
|---|---|---|
| ubot5 | Ubuntu bug 1453391 in linux (Ubuntu) "Very slow Qualcomm Atheros AR8121/AR8113/AR8114 Gigabit or Fast Ethernet (rev b0)" [Medium,Confirmed] | 09:40 |
| ePirat | Hello | 10:38 |
| ePirat | I filed a kernel bug and was asked to do a full commit bisect | 10:39 |
| ePirat | but I can't follow the guide on the wiki | 10:39 |
| ePirat | as I can't find the debian.master file where to make the changes | 10:39 |
| ePirat | should I just adjust the version number in makefile instead? | 10:40 |
| Taloth | ePirat: try ./debian.master/changelog | 12:05 |
| ePirat | Taloth, there is no debian.master folder | 12:26 |
| Taloth | http://kernel.ubuntu.com/git/ubuntu/ubuntu-trusty.git/tree/debian.master | 12:26 |
| Taloth | which version were you supposed to bisect? | 12:27 |
| ePirat | I am using the vivid repo | 12:27 |
| ePirat | 3.18.6 to 3.19.x (most recent one I guess) | 12:28 |
| Taloth | you already bisected the released versions (package)? | 12:28 |
| ePirat | yes, those are the working/non-working versions I identified, I can't narrow down more as other 3.18 versions higher mess up everything making reproducing my bug impossible there | 12:30 |
| ePirat | the issue is that wifi stops working after some time/data downloaded | 12:30 |
| ePirat | even though it still shows up as connected it behaves like it is not | 12:31 |
| ePirat | for testing I need to be able to run the system for at least an hour while downloading stuff | 12:31 |
| Taloth | In the bugreport you mentioned 3.18.6 working while 3.18.11 doesn't. | 12:31 |
| Taloth | so I assume you'll be commit bisecting from there on. | 12:32 |
| ePirat | 3.18.11 shows different non working behavior than I have actually observed in 3.19 (i get popups that errors occured in the system but those seems to not really be related to wifi) | 12:33 |
| Taloth | what's the next lower version you checked? | 12:33 |
| Taloth | 3.18.0-10 or something else? | 12:34 |
| ePirat | let me check (need to boot the affected machine) | 12:36 |
| ePirat | 3.18.6-031806 was the last working version for me, 3.18.11-031811 was the one I could not test properly with | 12:38 |
| Taloth | As for your original question, if you check out the repo from http://kernel.ubuntu.com/git/ubuntu/ubuntu-vivid.git the ./debian.master dir should be there. | 12:38 |
| Taloth | Maybe you're bisecting the upstream kernel tree? which wouldn't have debian.master | 12:39 |
| ePirat | I cloned from git://kernel.ubuntu.com/ubuntu/ubuntu-vivid.git | 12:40 |
| ePirat | I do have a debian.master folder in master, but not in my branch which I am using for bisect (which is currently at 0ce3c06) | 12:42 |
| Taloth | which branch are you bisecting on? seems to me like you should be using master. | 12:47 |
| ePirat | I followed the guide linked in the bug ticket, so I branched from master in a branch called mybisect and started the bisect | 12:48 |
| Taloth | which commit did you mark as good? | 12:54 |
| ePirat | bad: 83f803a good: f8e80fa | 12:56 |
| Taloth | but yeah, you're in the commit history of the upstream kernel, hence the missing debian.master. tbh, not sure how to normally deal with that. | 12:58 |
| ePirat | oh | 13:00 |
| ePirat | ok | 13:00 |
| Taloth | but did you install 3.18.0-14.15 from package? | 13:01 |
| ePirat | not sure… could you explain me how this versioning stuff works? I am confused by all the -x.x suffixes | 13:04 |
| Taloth | that's because ubuntu is based on the mainline kernel, which uses different version numbers. | 13:06 |
| Taloth | Your problem boils down to https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_bisect_the_upstream_kernel.3F | 13:07 |
| ePirat | ah | 13:08 |
| Taloth | welcome down the rabbit hole btw. | 13:08 |
| Taloth | :D | 13:08 |
| ePirat | :P | 13:09 |
| ePirat | I wish my bug would at least be easier to reproduce | 13:09 |
| Taloth | i had a bug that made mono crash on users systems at unpredictable times. sometimes minutes sometimes days. Took quite some time till I isolated the kernel commit breaking it. | 13:11 |
| Taloth | fortunately wasn't hardware related like your wifi issue | 13:11 |
| ePirat | usually I would just have used an older versions but there my trackpoint click buttons do not work properly… | 13:13 |
| Taloth | On the other hand, now you'll helping to make the world a better place :P | 13:14 |
| ePirat | it seems switching kernels so often messed something up as I now get the system error popup even on previously fine kernel versions… great… | 13:15 |
| ePirat | and I can't even report those as report fails with some error… | 13:15 |
| ePirat | I wonder why no other thinkpad x250 user has had this wifi problem yet | 13:18 |
| Taloth | they quite possibly did, and are angry atm but don't know how to fix it. | 13:18 |
| ePirat | tbh, reporting the ubuntu kernel bug was one of the hardest bug reporting experiences I ever had | 13:20 |
| ePirat | I wonder if it wouldn't be possible to narrow it down to a few commits, since it is some wifi related thing? | 13:26 |
| Taloth | that's where a bisect comes in. | 13:30 |
| Taloth | from what I could see the bisect is 13 steps, over 7000 commits. It's going to take a while. | 13:33 |
| ePirat | indeed, specially since reproducing the bug takes hours sometimes | 13:35 |
| Taloth | but don't give up, take your time, you'll be helping out the devs immensely. It will be near impossible for them to reproduce, much less fix. | 13:38 |
| ePirat | ok :) | 13:40 |
| ePirat | I think I will reinstall ubuntu later (specially since 15.04 is officially released now) and try to narrow it a bit more down with packaged kernel versions | 13:41 |
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