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| hallyn | hm, having a weird corruption issue on 4.13 kernel on artful. Create an empty file (truncate -s 30G), qemu-nbd attach it, create pv/vg/lv and thinpool-provision; setup a slew of filesystems; umount, disconnect, and ... corruption | 13:20 |
|---|---|---|
| hallyn | serge@lxd1:~/sandbox$ sudo qemu-nbd -f raw -c /dev/nbd0 /var/lib/lxd/disks/disk2.img | 13:20 |
| hallyn | Failed to set NBD socket | 13:20 |
| hallyn | Disconnect client, due to: End of file | 13:20 |
| hallyn | ohei. nbd1 doesn't complain though. | 13:21 |
| hallyn | (on zesty this all worked fine, exact same recipe, worked many times on zesty, failed 3x on artful) | 13:21 |
| hallyn | ok so let's try a reboot - though that didn't work last night, but there could always be >1 issues | 13:22 |
| cpaelzer | hi hallyn: you point to 4.13 - did you already have a chance to run the same with the zesty kernel but the artful lvm/nbd tools? | 13:23 |
| hallyn | cpaelzer: no, i haven't. i was kind of constrained in where i coudl run for the results i wanted, but i guess for reproducing this i can be anywhere. | 13:35 |
| hallyn | well this is frustrating :) | 13:36 |
| cpaelzer | hallyn: still corrupted? | 13:37 |
| cpaelzer | hallyn: do you have your "reate pv/vg/lv and thinpool-provision; setup a slew of filesystems" in a way you could share it to cross check over here? | 13:37 |
| hallyn | cpaelzer: yeah, mostly - it's kindof a general tool so there's extra cruft, but it's mainly using https://github.com/atom-deps/lpack/blob/master/setup_lvm.sh and https://github.com/atom-deps/lpack/blob/master/lpack_unpack.sh | 13:38 |
| hallyn | TBh kernel commit 7a362ea96d0df873397be04f4556e92f7e37c5ec looks suspect: "nbd: clear disconnected on reconnect" | 13:39 |
| hallyn | All right let me (1) setup a zesty vm and reproduce there, (2) do-release-upgrade -d there but not reboot, then finally reboot into artful kernel; and see which of those three work | 13:40 |
| hallyn | but imma do that at the coffee shop, back in a afew | 13:42 |
| cpaelzer | I tried with losetup but things worked for me (slightly reduced e.g. no snapshotting) | 13:53 |
| cpaelzer | interested what you'll see in your test in the zesty vm | 13:54 |
| hallyn | note this is using nbd not losetup | 13:58 |
| hallyn | lol maybe https://lkml.org/lkml/2017/7/21/294 | 14:00 |
| hallyn | cpaelzer: weeeeeel crap. cannot reproduce on vm on my own host. | 15:03 |
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| hallyn | oh, well, maybe it's a race. now it's acting funky. | 15:24 |
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