Created attachment 765757 [details] screenshots + .config files Please see attachment which contains kernel panic screenshots + two kernel .config files. The last working one (kernel 5.13.19) and the last one with kernel panic (5.16.10). There is only little difference between these configs - make oldconfig mostly. Screenshots has been taken using special .config with debug info and EFI framebuffer since standard kernel graphic driver (amdgpu) do not initialize properly - debug .config not included.
>CONFIG_DRM_SIMPLEDRM=y Unsure if related but the option did give me an unbootable kernel before. Not that I really dug into the issue, and that option is new in 5.14+ Disabling could be worth trying (I don't think I can help beyond that).
Ionen, thanks. I've been already experimenting with SIMPLEDRM settings but no success. Big change in 5.14 was the amdgpu, I guess this is the wrong part. I use these kernel configs slightly modified to Intel platform and it works on some aging Xeon without problems.
Which kernel was this ?
The source comments around that BUG are: /* * The location is not an op that we were expecting. * Something went wrong. Crash the box, as something could be * corrupting the kernel. you could up the log level to get some more details, (CONFIG_DEFAULT_MESSAGE_LOGLEVEL) (7 is debug [1] ) but you're probably going to need to do a git bisect between a working kernel and the first non-working kernel. [1] https://elinux.org/Debugging_by_printing
(In reply to Mike Pagano from comment #3) > Which kernel was this ? sys-kernel/gentoo-sources-5.16.10 I'm going to provide some more info in the near future according to your suggestions.
(In reply to j.l. from comment #5) > (In reply to Mike Pagano from comment #3) > > Which kernel was this ? > > sys-kernel/gentoo-sources-5.16.10 > > I'm going to provide some more info in the near future according to your > suggestions. Any progress here?
I deselected CONFIG_MNATIVE_AMD and replaced it by manual CPU selection (CONFIG_MSTEAMROLLER) and it works flawlessly. Vanilla kernel (both git checkout and sys-kernel/vanilla-sources) works out of the box since there is no modern archs support and compilation defaults to generic x86_64. Errors appearing during kernel compilation: init/main.o: warning: objtool: kernel_init_freeable()+0x92: can't find jump dest instruction at .init.text+0x1ac4 arch/x86/events/amd/core.o: warning: objtool: amd_pmu_handle_irq()+0x28: stack state mismatch: cfa1=4+8 cfa2=4+0 I guess it is compiler fault which accidentally works prior to kernel 5.14. Portage utilizes -mnative on the same machine with no known problems.
