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| caribou | apw: remember the vm.min_free_kbytes issue with kdump ? | 14:34 |
|---|---|---|
| caribou | Bug: #1528101 | 14:35 |
| ubot5` | bug 1528101 in kexec-tools (Ubuntu) "ISST-LTE: kdump failed: second kernel booting hangs after /scripts/init-bottom when large min_free_kbytes value being set" [Undecided,Confirmed] https://launchpad.net/bugs/1528101 | 14:35 |
| apw | caribou, let me say vaguely | 14:36 |
| caribou | apw: well, whe vm.min_free_kbytes is higher than crashkernel value, OOM kicks in & doesn't let kdump run | 14:42 |
| caribou | apw: anyhow, it is much more complex to fix than what I thought : nowadays systemd-sysctl systemd unit takes care of loading the sysctl values and not procs | 14:43 |
| apw | caribou, of course it does | 14:49 |
| caribou | apw: well, since the bug was reported on Trusty I didn't bother to check Xenial | 14:49 |
| apw | (i wasn't expecting you to have noticed, just expressing my frustration that systemd had changed the way something worked) | 14:50 |
| caribou | apw: but just hacking propc to detect /proc/vmcore won't work & I don't feel like changing systemd.service-sysctl | 14:50 |
| caribou | apw: :) | 14:50 |
| apw | so you are saying that systemd is reading procps's config files directly and applying them | 14:50 |
| apw | when we have a perfectly good program to do that alrady | 14:51 |
| caribou | apw: yes; it applies everything in /etc/sysctl.d & add a symlink in there toward /etc/sysctl.conf | 14:51 |
| apw | caribou, dammit | 14:52 |
| apw | caribou, when we boot in kdump world do we boot a different "target" in systemd land | 14:53 |
| caribou | apw: I force it to go to systemd.unit=kdump-tools.service but in that corner case, it never makes it to that target | 14:54 |
| caribou | apw: I'm not tempted to bend over backward to fix a corner case where the user has set a kernel value that is not coherent with the use of crashkernel= | 14:55 |
| caribou | apw: they should just raise crashkernel in that case (which is the workaround I proposed in the bug) | 14:55 |
| caribou | I can always fix Trusty for that, but it will be a Trusty-only solution | 14:56 |
| diwic | is it expected to get a "warning: file-aligned section .text extends beyond end of file" when installing linux-signed-image 4.4.0-2.16 ? | 14:57 |
| diwic | probably not. filed https://bugs.launchpad.net/bugs/1540406 | 15:00 |
| ubot5` | Launchpad bug 1540406 in linux-signed (Ubuntu) "warning: file-aligned section .text extends beyond end of file" [Undecided,New] | 15:00 |
| apw | diwic, do you have secure-boot enabled, and if so does it at least boot ok ? | 15:01 |
| diwic | apw, I think secure-boot is disabled | 15:02 |
| apw | caribou, i think that there are more than one way the cat gets skinned in userspace that we may be forced to do ti in the kernel | 15:05 |
| apw | *that as there are* | 15:05 |
| caribou | apw: do we _really_ want to go that far for such a limited set of possibilities ? (though I agree that allowing vm.min_free_kbytes to be larger than the whole memory makes no sense) | 15:07 |
| apw | right, i am inclined to think we could at least reject that combination and get 95% of the way there | 15:07 |
| diwic | apw, I enabled secure boot and booted the kernel, seems to work | 15:09 |
| apw | diwic, ok, so at least that is something, could you shove that info in the bug pls. | 15:10 |
| caribou | apw: your call; I will propose to add a simple upstart job that sets the value to what they want for Trusty for that bug | 15:10 |
| diwic | apw, will do | 15:10 |
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