bisecting fixing commit since 7aa823a959e1f50c0dab9e01c1940235eccc04cc building syzkaller on 442206d76b974cca2d83ec763d4cf5ee829eb7d6 testing commit 7aa823a959e1f50c0dab9e01c1940235eccc04cc with gcc (GCC) 8.1.0 kernel signature: 13d56dba1a9bec27480aa3245777a990c2ac284d all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run testing current HEAD 3d40d7117e353b84627c1e8c5ed9ae0b1237ef5c testing commit 3d40d7117e353b84627c1e8c5ed9ae0b1237ef5c with gcc (GCC) 8.1.0 kernel signature: 43639006922488fa81a65bebb987d87425b04fc0 all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run revisions tested: 2, total time: 23m57.776395978s (build: 16m47.405155037s, test: 6m27.234713315s) the crash still happens on HEAD commit msg: Linux 4.19.93 crash: WARNING in kvm_arch_vcpu_ioctl_run 8021q: adding VLAN 0 to HW filter on device batadv0 IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7283 at arch/x86/kvm/x86.c:8067 kvm_arch_vcpu_ioctl_run+0x170/0x1340 arch/x86/kvm/x86.c:8067 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 7283 Comm: syz-executor.5 Not tainted 4.19.93-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x123/0x177 lib/dump_stack.c:118 panic+0x1cd/0x375 kernel/panic.c:186 __warn.cold.8+0x1b/0x3e kernel/panic.c:541 report_bug+0x1a4/0x200 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037 RIP: 0010:kvm_arch_vcpu_ioctl_run+0x170/0x1340 arch/x86/kvm/x86.c:8067 Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 7a 10 00 00 49 83 bf 20 2c 00 00 00 0f 84 22 08 00 00 48 c7 c7 a0 16 c2 86 e8 2f 27 42 00 <0f> 0b 48 8d 7b 01 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea RSP: 0018:ffff888072e5fa98 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff888096476000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff86ff23a0 RDI: ffffffff89a7e6a0 RBP: ffff888072e5fb10 R08: ffffed1015d65079 R09: ffffed1015d65078 R10: ffffed1015d65078 R11: ffff8880aeb283c7 R12: ffff88809b8d0158 R13: ffff88809b8d00d8 R14: ffff88809b8d049c R15: ffff88809b8d0080 kvm_vcpu_ioctl+0x535/0xb60 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2667 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688 ksys_ioctl+0x62/0x90 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4592c9 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa14550bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004592c9 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa14550c6d4 R13: 00000000004c25fb R14: 00000000004d55b8 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..