bisecting fixing commit since bc2bccef19ee4353d759a12950088b968b5c6618 building syzkaller on 0a8d1a965a65f2d6cc93d1180443f5ad658919b1 testing commit bc2bccef19ee4353d759a12950088b968b5c6618 with gcc (GCC) 8.1.0 kernel signature: 46b60ec0f4ac5232b910e5ed713c636854a5f7bb all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run testing current HEAD b0cdffaa546e24acf92ab3b0d4e917a51aff6a82 testing commit b0cdffaa546e24acf92ab3b0d4e917a51aff6a82 with gcc (GCC) 8.1.0 kernel signature: 8c77ec4de292396aee07105e0125d4d93cf0f22e all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run revisions tested: 2, total time: 22m40.608962788s (build: 15m26.84611828s, test: 6m24.706677651s) the crash still happens on HEAD commit msg: Linux 4.14.163 crash: WARNING in kvm_arch_vcpu_ioctl_run IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready IPv6: ADDRCONF(NETDEV_UP): veth1_to_hsr: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6975 at arch/x86/kvm/x86.c:7531 kvm_arch_vcpu_ioctl_run+0xca/0xec0 arch/x86/kvm/x86.c:7531 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 6975 Comm: syz-executor.2 Not tainted 4.14.163-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xf7/0x13b lib/dump_stack.c:58 panic+0x1b0/0x358 kernel/panic.c:183 __warn.cold.8+0x25/0x2c kernel/panic.c:547 report_bug+0x1a4/0x1f3 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:177 [inline] do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963 RIP: 0010:kvm_arch_vcpu_ioctl_run+0xca/0xec0 arch/x86/kvm/x86.c:7531 RSP: 0018:ffff88809fed7b38 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ffff8880947a7000 RCX: 0000000000000000 RDX: 1ffff110104e8075 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff88809fed7bb0 R08: ffff888076b2ad20 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809ceb3a80 R13: ffff888082740258 R14: ffff88808274059c R15: ffff888082740180 kvm_vcpu_ioctl+0x45e/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2661 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x180/0xfb0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x74/0x80 fs/ioctl.c:692 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459519 RSP: 002b:00007f0633296c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459519 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f06332976d4 R13: 00000000004c284e R14: 00000000004d5af8 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..