On 05/14/19 at 04:09pm, Ingo Molnar wrote: > > * Dave Young <dyoung@xxxxxxxxxx> wrote: > > > On 05/14/19 at 01:38pm, Peter Zijlstra wrote: > > > On Tue, May 14, 2019 at 04:48:41PM +0800, Dave Young wrote: > > > > > > > > I did some tests on the laptop, thing is: > > > > > 1. apply the 3 patches (two you posted + Boris's revert commit 52b922c3d49c) > > > > > on latest Linus master branch, everything works fine. > > > > > > > > > > 2. build and test the tip/next-merge-window branch, kernel hangs early > > > > > without output, (both 1st boot and kexec boot) > > > > > > > > Update about 2. It should be not early rsdp related, I got the boot log > > > > Since can not reproduce with Linus master branch it may have been fixed. > > > > > > Nothing was changed here since PTI. > > > > > > > [ 0.685374][ T1] rcu: Hierarchical SRCU implementation. > > > > [ 0.686414][ T1] general protection fault: 0000 [#1] SMP PTI > > > > [ 0.687328][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.1.0-rc6+ #877 > > > > [ 0.687328][ T1] Hardware name: LENOVO 4236NUC/4236NUC, BIOS 83ET82WW (1.52 ) 06/04/2018 > > > > [ 0.687328][ T1] RIP: 0010:reserve_ds_buffers+0x34e/0x450 > > > > > > > [ 0.687328][ T1] Call Trace: > > > > [ 0.687328][ T1] ? hardlockup_detector_event_create+0x50/0x50 > > > > [ 0.687328][ T1] x86_reserve_hardware+0x173/0x180 > > > > [ 0.687328][ T1] x86_pmu_event_init+0x39/0x220 > > > > > > The DS buffers are special in that they're part of cpu_entrt_area. If > > > this comes apart it might mean your pagetables are dodgy. > > > > Hmm, it seems caused by some WIP branch patches, I suspect below: > > commit 124d6af5a5f559e516ed2c6ea857e889ed293b43 > > x86/paravirt: Standardize 'insn_buff' variable names > > This commit had a bug which I fixed - could you try the latest -tip? Will do, but I do not use tip tree often, not sure which branch includes the fix. https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/ Is it tip/master or tip/tip? Thanks Dave _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
