Re: USB-hotplugging fails with "failed to load cgroup BPF prog: Operation not permitted" on cgroups v2

Hi, Quoting Pavel Hrdina (2020-01-21 12:53:49) > Thanks for the logs, but it did not help to figure out where the issue > is. I was hoping to see some error output from the syscall but the line > that should contain it is empty: > > 2020-01-20 19:47:15.589+0000: 8579: debug : virBPFLoadProg:78 : > > Can you please check system logs and output of dmesg? > > I've managed to run into this article [1] that explains that even if you > have all permissions and no SELinux you can still be blocked by > something called kernel_lockdown and it should appear in dmesg. > > Pavel > > [1] <https://gehrcke.de/2019/09/running-an-ebpf-program-may-require-lifting-th... Unfortunately, nothing related to kernel lockdowns. My kernel sysrq also doesn't seem to recognize x, and neither dmesg nor system journal indicate the system is even booted with lockdowns. I don't run Secure Boot, so that makes sense. I do get an audit message but that doesn't really enlighten me any further; there's only 4 messages in the journal related to this action. <snip> I honestly don't know how to even begin debugging what's happening, what the reason for the rejection is.