On 11/21/2016 01:15 AM, taii...@gmx.com wrote: > Specs: > blob free coreboot on a kgpe-d16 (amd opteron) > > > Happens with both the livecd/usb and a kernel I compiled on another > machine (however with that one I simply get a black screen and a bootloop)
Look at CONFIG_PANIC_TIMEOUT. If it's set to anything other than 0 your kernel will reboot itself on panic after the timeout. It's probably panicing when initialing the video drivers since you get a blank screen so you'll probably want to boot with a vga fb driver (blacklist or delete all other video modules) and post the backtrace if it still panics. > Other distros kernels work fine, it is just gentoo. Then I suggest you try grabbing the kernel's config file from another distro and use that as a starting point to configure your kernel > The livecd and compiled kernel work fine on all my other computers/VMM's. > > Upon loading I get to amd performance counters, it freezes and 5-10 secs > later I receive stack trace for kthreadd "hung" (amd_pmu_init - seems to > be the primary reason) I never get to a login prompt. > > It isn't microcode related as I removed the microcode packages from the > other distros I tried. > > Any ideas? Is there any additional info that would be helpful? How can I > dump the boot text? It's gonna be trial and error. Keep disabling features and try a different kernel version (the one that worked with other distros) until you pinpoint the problem. The only hints you got are the panic backtrces and boot output. Then file a bug. As for dumping the boot output if you can't get to userland I think the only way is with a serial or net console. Also look at CONFIG_BOOT_PRINTK_DELAY, it can setup a delay before every printk message so you at least get time to read it. -- Fernando Rodriguez
