On Sat, Nov 12, 2016 at 4:57 AM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > Hello, > > The following program triggers WARNING in kvm_load_guest_fpu: > https://gist.githubusercontent.com/dvyukov/5bc076073b48772e22b5f33acbe2b743/raw/1000df869f0d58a5c6e637268453c711280b255d/gistfile1.txt > > On commit 015ed9433be2b476ec7e2e6a9a411a56e3b5b035 (Nov 11). > > WARNING: CPU: 3 PID: 23924 at > ./arch/x86/include/asm/fpu/internal.h:164 > kvm_load_guest_fpu.part.163+0xf1/0x340 > Kernel panic - not syncing: panic_on_warn set ... > > CPU: 3 PID: 23924 Comm: syz-executor Not tainted 4.9.0-rc4+ #44 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > ffff88006ce67920 ffffffff81c2f79b ffffffff83271fc0 ffff88006ce679f8 > ffffffff8321c300 ffffffff81096631 ffff88006ce679e8 ffffffff81548463 > 0000000041b58ab3 ffffffff837cd505 ffffffff815482ac ffffffff815490e9 > Call Trace: > [< inline >] __dump_stack lib/dump_stack.c:15 > [<ffffffff81c2f79b>] dump_stack+0xb3/0x118 lib/dump_stack.c:51 > [<ffffffff81548463>] panic+0x1b7/0x3a3 kernel/panic.c:179 > [<ffffffff81240014>] __warn+0x1c4/0x1e0 kernel/panic.c:542 > [<ffffffff812401fc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 > [< inline >] copy_kernel_to_fxregs > arch/x86/include/asm/fpu/internal.h:164 > [< inline >] __copy_kernel_to_fpregs > arch/x86/include/asm/fpu/internal.h:454 > [<ffffffff81096631>] kvm_load_guest_fpu.part.163+0xf1/0x340 > arch/x86/kvm/x86.c:7383 > [< inline >] kvm_load_guest_fpu arch/x86/kvm/x86.c:6456 > [< inline >] vcpu_enter_guest arch/x86/kvm/x86.c:6660 > [< inline >] vcpu_run arch/x86/kvm/x86.c:6826 > [<ffffffff810bb493>] kvm_arch_vcpu_ioctl_run+0x3b13/0x5a90 > arch/x86/kvm/x86.c:6984 > [<ffffffff8106091e>] kvm_vcpu_ioctl+0x61e/0xdd0 > arch/x86/kvm/../../../virt/kvm/kvm_main.c:2557 > [< inline >] vfs_ioctl fs/ioctl.c:43 > [<ffffffff816b16fc>] do_vfs_ioctl+0x18c/0x1040 fs/ioctl.c:679 > [< inline >] SYSC_ioctl fs/ioctl.c:694 > [<ffffffff816b263f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 > [<ffffffff831ebdc1>] entry_SYSCALL_64_fastpath+0x1f/0xc2 > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > reboot: cpu_has_vmx: ecx=80a02021 1 ping this may be an information leak
