| === Guest4747 is now known as ogra | ||
| ChmEarl | running xen in noble 24.04 with kernel-6.5, I see UBSAN kernel errors in xen-blkback and xen-netback drivers when domU launch | 16:39 |
|---|---|---|
| ChmEarl | but everything works | 16:39 |
| ChmEarl | in dmesg: UBSAN: array-index-out-of-bounds in /build/linux-D15vQj/linux-6.5.0/drivers/block/xen-blkback/blkback.c:1227:4 | 16:40 |
| lotuspsychje | ChmEarl: since noble development is still early and i dont see xen related bugs on your case, might be worth a new bug? | 16:44 |
| lotuspsychje | unless some of our server testers can try to reproduce that first | 16:44 |
| ChmEarl | lotuspsychje, ty, I was trying to see if there are any reproduce cases yet | 16:45 |
| ChmEarl | my CPU is ancient, CORE2quad | 16:45 |
| lotuspsychje | ChmEarl: there are some other bugs with your ubsan error around though | 16:47 |
| lotuspsychje | bug #2002842 would be one | 16:47 |
| -ubottu:#ubuntu-next- Bug 2008157 in linux (Ubuntu) "[SRU][Ubuntu 22.04.1]: Observed 'Array Index out of bounds' Call Trace multiple times on Ubuntu 22.04.1 OS during boot" [Medium, In Progress] [duplicate: 2002842] https://launchpad.net/bugs/2008157 | 16:47 | |
| ChmEarl | I might try to run it on ivy-bridge soon | 16:47 |
| lotuspsychje | so, not sure its noble specific? | 16:47 |
| lotuspsychje | ChmEarl: an idea arising could be booting a previous kernel, to see if this is kernel related | 16:54 |
| ChmEarl | lotuspsychje, not sure if I can run a kernel from mantic? or jammy? | 16:56 |
| ChmEarl | there is only 1 kernel for noble | 16:56 |
| ChmEarl | I was worried that its related to CPU support for stuff like: avx or aes | 16:57 |
| lotuspsychje | well its only for a test, if we assume your UBSAN error would only arise from kernel 6.5 for example | 16:58 |
| ChmEarl | yes, thinking its specific to very recent kernel | 16:58 |
| lotuspsychje | im also thinking so | 16:59 |
| lotuspsychje | im seeing those UBSAN kernel errors in different bugs all over, not only xen | 17:00 |
| ChmEarl | trying with 4 files from lunar: 6.2.0.20.20 | 17:19 |
| ChmEarl | noble made no complaint | 17:20 |
| lotuspsychje | ok tnx for the test ChmEarl | 17:23 |
| lotuspsychje | so now to findout its really a useful warning to xen; or just an UBSAN default warning since a kernel version | 17:29 |
| ChmEarl | lotuspsychje, the install of the lunar 6.2.0-20 packages worked, but xen/kernel-6.2 won't boot | 17:44 |
| ChmEarl | at least I didn't waste hardly any time trying | 17:44 |
| lotuspsychje | what you can do is messing with later mainline kernels too | 17:45 |
| lotuspsychje | i didnt test xen myself so cant help there | 17:46 |
| ChmEarl | the XEN & UBSAN configs are the same for the 2 kernels | 17:49 |
| === tomreyn_ is now known as tomreyn | ||
| ChmEarl | requesting a kernel-6.5 build with # CONFIG_UBSAN is not set | 22:15 |
| ChmEarl | or turn-off array bound checks | 22:15 |
| ChmEarl | xen domU is flooded with ubsan errors | 22:16 |
| === JanC is now known as Guest2259 | ||
| === JanC_ is now known as JanC | ||
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