bisecting fixing commit since 7aa823a959e1f50c0dab9e01c1940235eccc04cc
building syzkaller on 442206d76b974cca2d83ec763d4cf5ee829eb7d6
testing commit 7aa823a959e1f50c0dab9e01c1940235eccc04cc with gcc (GCC) 8.1.0
kernel signature: fa13bcb0836958efc08b980d95885d4df270c17fce363d4c797beb7a152f0028
all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run
testing current HEAD 6dd0e32665e591e9debe3edaf73c2f8135bf047e
testing commit 6dd0e32665e591e9debe3edaf73c2f8135bf047e with gcc (GCC) 8.1.0
kernel signature: e5611efc5c20b6cf9e5234d2caa1cc553c04003eb6ebbdea590235023bcc8be9
all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run
revisions tested: 2, total time: 24m6.882855498s (build: 17m13.73355317s, test: 6m9.303468798s)
the crash still happens on HEAD
commit msg: Linux 4.19.115
crash: WARNING in kvm_arch_vcpu_ioctl_run
8021q: adding VLAN 0 to HW filter on device batadv0
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: 7421 at arch/x86/kvm/x86.c:8108 kvm_arch_vcpu_ioctl_run+0x170/0x1340 arch/x86/kvm/x86.c:8108
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7421 Comm: syz-executor.2 Not tainted 4.19.115-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:8108
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 5f 52 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:ffff88808a5e7a98 EFLAGS: 00010282
RAX: 0000000000000024 RBX: ffff8880a400a000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff86ff2920 RDI: ffffffff89a816a0
RBP: ffff88808a5e7b10 R08: ffffed1015d65079 R09: ffffed1015d65078
R10: ffffed1015d65078 R11: ffff8880aeb283c7 R12: ffff88808c320618
R13: ffff88808c320598 R14: ffff88808c32095c R15: ffff88808c320540
 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:00007fe2675f4c78 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: 00007fe2675f56d4
R13: 00000000004c25fb R14: 00000000004d55b8 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..