On Sat, Nov 12, 2016 at 2:56 AM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote: > Hello, > > The following program triggers WARNING in kvm_apic_accept_events: > https://gist.githubusercontent.com/dvyukov/95b845a2e637485568ea1ef181a72370/raw/d90717dd67128b21715c5e794568a1600f613d97/gistfile1.txt > > On commit 015ed9433be2b476ec7e2e6a9a411a56e3b5b035 (Nov 11). > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 23523 at arch/x86/kvm/lapic.c:2330 > kvm_apic_accept_events+0x3f6/0x460 > Modules linked in:[ 55.632648] CPU: 1 PID: 2812 Comm: a.out Not > tainted 4.9.0-rc4+ #41 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > ffff88006be77978 ffffffff81c2f79b 0000000000000000 0000000000000000 > ffffffff8322d6a0 ffffffff81127426 ffff88006be779c0 ffffffff8123ffef > ffffffff811acc46 ffffffff0000091a ffffffff8322d6a0 000000000000091a > Call Trace: > [< inline >] __dump_stack lib/dump_stack.c:15 > [<ffffffff81c2f79b>] dump_stack+0xb3/0x118 lib/dump_stack.c:51 > [<ffffffff8123ffef>] __warn+0x19f/0x1e0 kernel/panic.c:550 > [<ffffffff812401fc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585 > [<ffffffff81127426>] kvm_apic_accept_events+0x3f6/0x460 > arch/x86/kvm/lapic.c:2330 > [< inline >] vcpu_block arch/x86/kvm/x86.c:6793 > [< inline >] vcpu_run arch/x86/kvm/x86.c:6828 > [<ffffffff810b8f20>] kvm_arch_vcpu_ioctl_run+0x1580/0x5a90 > 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 > [<ffffffff831ebd01>] entry_SYSCALL_64_fastpath+0x1f/0xc2 > arch/x86/entry/entry_64.S:209 > ---[ end trace b2415ddd1b26dce6 ]--- ping
