On Fri, Nov 25, 2011 at 12:37:04PM -0200, Luiz Capitulino wrote: > On Fri, 25 Nov 2011 16:12:37 +0200 > Alon Levy <al...@redhat.com> wrote: > > > On Thu, Nov 24, 2011 at 04:03:55PM -0200, Luiz Capitulino wrote: > > > Avi, > > > > > > > I have the same panic and the same bisection result. It doesn't happen > > with recent (3.2.0 rc1 and rc3) kernels. > > Would be nice to test a recent kernel with 66e3dd9 reverted. It'll be funny > if it fails :)
It doesn't - a recent kernel doesn't care. I'm using 3.2.0-rc3 (f1e652b). With 66e3dd9 reverted: 3.2.0 (66e3dd9 but also an rc1 commit I used before rebasing yesterday) passes 3.1.0-5 passes 3.1.1-1 passes Normally (not reverted): 3.2.0 (66e3dd9) passes 3.1.0-5 fails 3.1.1-1 fails > > > > > > I'm getting the following panic very early on boot on a F16 VM (latest > > > qemu.git head 40897c9): > > > > > > [ 0.068018] Kernel panic - not syncing: Boot APIC ID in local APIC > > > unexpected (-1 vs 0) > > > [ 0.070006] Pid: 1, comm: swapper Not tainted 3.1.0-7.fc16.x86_64 #1 > > > [ 0.071004] Call Trace: > > > [ 0.072035] [<ffffffff814acb8e>] panic+0x91/0x1a5 > > > [ 0.073027] [<ffffffff81b831ca>] native_smp_prepare_cpus+0x24c/0x300 > > > [ 0.075010] [<ffffffff81b76c0d>] kernel_init+0x85/0x158 > > > [ 0.075993] [<ffffffff810527eb>] ? schedule_tail+0x27/0x6c > > > [ 0.076017] [<ffffffff814be5f4>] kernel_thread_helper+0x4/0x10 > > > [ 0.077022] [<ffffffff81b76b88>] ? start_kernel+0x3b6/0x3b6 > > > [ 0.078009] [<ffffffff814be5f0>] ? gs_change+0x13/0x13 > > > > > > After some debugging and I found out that this only happens when '-cpu > > > host' > > > is passed, and according to git bisect it's caused by the following > > > commit: > > > > > > commit 66e3dd9282141b5ae75637c9676002cf3ceeb988 > > > Author: Avi Kivity <a...@redhat.com> > > > Date: Wed Nov 9 15:44:36 2011 +0200 > > > > > > i386: derive '-cpu host' from KVM_GET_SUPPORTED_CPUID > > > > > > Not sure if this is important, but here's procinfo information about > > > one of my host's cpus: > > > > > > processor : 0 > > > vendor_id : GenuineIntel > > > cpu family : 6 > > > model : 23 > > > model name : Intel(R) Core(TM)2 Duo CPU T9600 @ 2.80GHz > > > stepping : 6 > > > cpu MHz : 2801.000 > > > cache size : 6144 KB > > > physical id : 0 > > > siblings : 2 > > > core id : 0 > > > cpu cores : 2 > > > apicid : 0 > > > initial apicid : 0 > > > fpu : yes > > > fpu_exception : yes > > > cpuid level : 10 > > > wp : yes > > > flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge > > > mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe > > > syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni > > > dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm > > > tpr_shadow vnmi flexpriority > > > bogomips : 5585.87 > > > clflush size : 64 > > > cache_alignment : 64 > > > address sizes : 36 bits physical, 48 bits virtual > > > power management: > > > > > >
