I get this (seemingly harmless) backtrace in a VM's dmesg on my AMD machine: 0.031000] Performance Events: [ 0.031000] ------------[ cut here ]------------ [ 0.031000] WARNING: at arch/x86/kernel/cpu/perf_event_amd.c:772 amd_pmu_init+0x18c/0x249() [ 0.031000] Hardware name: Bochs [ 0.031000] Odd, counter constraints enabled but no core perfctrs detected! [ 0.031000] Modules linked in: [ 0.031000] Pid: 1, comm: swapper/0 Not tainted 3.9.0-0.rc1.git0.4.fc19.x86_64 #1 [ 0.031000] Call Trace: [ 0.031000] [<ffffffff81d10c67>] ? amd_pmu_init+0x18c/0x249 [ 0.031000] [<ffffffff8105c9a0>] warn_slowpath_common+0x70/0xa0 [ 0.031000] [<ffffffff81d106b3>] ? check_bugs+0x2d/0x2d [ 0.031000] [<ffffffff8105ca1c>] warn_slowpath_fmt+0x4c/0x50 [ 0.031000] [<ffffffff81d10c67>] amd_pmu_init+0x18c/0x249 [ 0.031000] [<ffffffff81d106e7>] init_hw_perf_events+0x34/0x428 [ 0.031000] [<ffffffff81d106b3>] ? check_bugs+0x2d/0x2d [ 0.031000] [<ffffffff8100210a>] do_one_initcall+0x10a/0x160 [ 0.031000] [<ffffffff81d06fa5>] kernel_init_freeable+0xcf/0x1fa [ 0.031000] [<ffffffff81629800>] ? rest_init+0x80/0x80 [ 0.031000] [<ffffffff8162980e>] kernel_init+0xe/0x190 [ 0.031000] [<ffffffff8164e22c>] ret_from_fork+0x7c/0xb0 [ 0.031000] [<ffffffff81629800>] ? rest_init+0x80/0x80 [ 0.031000] ---[ end trace a1e57d3cb8668105 ]--- Seen it on 3.6 and up, that trace is from 3.9.0-0.rc1.git0.4.fc19.x86_64 . qemu-kvm -cpu host and -cpu Opteron_G4 reproduce it on my AMD machine. -cpu Opteron_G4 does not reproduce it on an intel machine. F18 and rawhide qemu packages affected. Guest uname -a: Linux localhost.localdomain 3.9.0-0.rc1.git0.4.fc19.x86_64 #1 SMP Thu Mar 7 01:22:13 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux Hose uname -a: Linux colepc 3.8.1-201.fc18.x86_64 #1 SMP Thu Feb 28 19:23:08 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux Reproducing qemu command: sudo qemu-kvm -cpu host -drive file=/mnt/data/devel/images/frawhide.qcow2,if=none,id=drive-virtio-disk0,format=qcow2 -device virtio-blk-pci,drive=drive-virtio-disk0
Created attachment 710159 [details] Guest dmesg
Created attachment 710160 [details] Guest /proc/cpuinfo
Created attachment 710161 [details] Host /proc/cpuinfo
Gleb, any insight? (since this is KVM + PMU related)
The warning should be removed from the kernel. The kernel does not expect to find AMD familiy 15h processor without PMU support, but that it exactly what we have in KVM. May be not remove completely, but make it printk instead of WARN.
*** Bug 929427 has been marked as a duplicate of this bug. ***
I emailed upstream with Gleb's suggestion. We'll see what they say. http://thread.gmane.org/gmane.linux.kernel/1492071
Description of problem: Intalled xfce version of fedora 18 64bit in a virtualbox under windows. I am now getting this error on boot up Version-Release number of selected component: kernel Additional info: reporter: libreport-2.1.4 cmdline: BOOT_IMAGE=/boot/vmlinuz-3.9.4-200.fc18.x86_64 root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/swap rd.md=0 rd.dm=0 rd.luks=0 vconsole.keymap=us rd.lvm.lv=fedora/root rhgb quiet LANG=en_US.UTF-8 kernel: 3.9.4-200.fc18.x86_64 runlevel: unknown type: Kerneloops Truncated backtrace: WARNING: at arch/x86/kernel/cpu/perf_event_amd.c:772 amd_pmu_init+0x18c/0x24b() Hardware name: VirtualBox Odd, counter constraints enabled but no core perfctrs detected! Modules linked in: Pid: 1, comm: swapper/0 Not tainted 3.9.4-200.fc18.x86_64 #1 Call Trace: [<ffffffff8105f125>] warn_slowpath_common+0x75/0xa0 [<ffffffff81d0d5b8>] ? check_bugs+0x2d/0x2d [<ffffffff8105f206>] warn_slowpath_fmt+0x46/0x50 [<ffffffff81d0db84>] amd_pmu_init+0x18c/0x24b [<ffffffff81d0d5f7>] init_hw_perf_events+0x3f/0x440 [<ffffffff81d0d5b8>] ? check_bugs+0x2d/0x2d [<ffffffff8100215a>] do_one_initcall+0x12a/0x180 [<ffffffff81d03f90>] kernel_init_freeable+0xad/0x1df [<ffffffff81646300>] ? rest_init+0x80/0x80 [<ffffffff8164630e>] kernel_init+0xe/0xf0 [<ffffffff81669eac>] ret_from_fork+0x7c/0xb0 [<ffffffff81646300>] ? rest_init+0x80/0x80
*** Bug 972538 has been marked as a duplicate of this bug. ***
This should be fixed in linux-next (and 3.11). https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?h=perf/x86&id=1b45adcd9a503428e6de6b39bc6892d86c9c1d41 We'll look at backporting later.
Thanks
Description of problem: Problem happened at initial reboot after install. This is also running on as a VM using virtualbox. Version-Release number of selected component: kernel Additional info: reporter: libreport-2.1.4 cmdline: BOOT_IMAGE=/vmlinuz-3.9.2-301.fc19.i686 root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/swap rd.md=0 rd.dm=0 vconsole.keymap=us rd.luks=0 vconsole.font=latarcyrheb-sun16 rd.lvm.lv=fedora/root rhgb quiet kernel: 3.9.2-301.fc19.i686 runlevel: unknown type: Kerneloops Truncated backtrace: WARNING: at arch/x86/kernel/cpu/perf_event_amd.c:772 amd_pmu_init+0x180/0x231() Hardware name: VirtualBox Odd, counter constraints enabled but no core perfctrs detected! Modules linked in: Pid: 1, comm: swapper/0 Not tainted 3.9.2-301.fc19.i686 #1 Call Trace: [<c043e603>] warn_slowpath_common+0x63/0x80 [<c0c3c328>] ? amd_pmu_init+0x180/0x231 [<c0c3c328>] ? amd_pmu_init+0x180/0x231 [<c0c3bd89>] ? check_bugs+0xc8/0xc8 [<c043e653>] warn_slowpath_fmt+0x33/0x40 [<c0c3c328>] amd_pmu_init+0x180/0x231 [<c0c3bd89>] ? check_bugs+0xc8/0xc8 [<c0c3bdb4>] init_hw_perf_events+0x2b/0x41f [<c0c37ad8>] ? set_real_mode_permissions+0x5d/0x65 [<c0c3bd89>] ? check_bugs+0xc8/0xc8 [<c04011fa>] do_one_initcall+0x10a/0x150 [<c0c417d9>] ? native_smp_prepare_cpus+0x2e1/0x2e6 [<c0c35b1a>] kernel_init_freeable+0x9a/0x1c9 [<c095ed90>] kernel_init+0x10/0x140 [<c097d7f7>] ret_from_kernel_thread+0x1b/0x28 [<c095ed80>] ? rest_init+0x60/0x60