bisecting fixing commit since bc2bccef19ee4353d759a12950088b968b5c6618
building syzkaller on 0a8d1a965a65f2d6cc93d1180443f5ad658919b1
testing commit bc2bccef19ee4353d759a12950088b968b5c6618 with gcc (GCC) 8.1.0
kernel signature: 4824a12cbe8d641b3d6ce89354bbc4b13646b3ba
all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run
testing current HEAD a844dc4c544291470aa69edbe2434b040794e269
testing commit a844dc4c544291470aa69edbe2434b040794e269 with gcc (GCC) 8.1.0
kernel signature: 810e93abd6b681bc3572bf5720636ec7aa443762
all runs: crashed: WARNING in kvm_arch_vcpu_ioctl_run
revisions tested: 2, total time: 22m48.698654863s (build: 15m14.240871702s, test: 6m42.692931783s)
the crash still happens on HEAD
commit msg: Linux 4.14.158
crash: WARNING in kvm_arch_vcpu_ioctl_run
IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
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: 7294 at arch/x86/kvm/x86.c:7525 kvm_arch_vcpu_ioctl_run+0xca/0xec0 arch/x86/kvm/x86.c:7525
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7294 Comm: syz-executor.5 Not tainted 4.14.158-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
kobject: 'kvm' (ffff8880a6eb3450): kobject_uevent_env
 __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
kobject: 'kvm' (ffff8880a6eb3450): kobject_uevent_env
 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:7525
kobject: 'kvm' (ffff8880a6eb3450): fill_kobj_path: path = '/devices/virtual/misc/kvm'
RSP: 0018:ffff888096867b38 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff888090489000 RCX: 0000000000000000
RDX: 1ffff110129661c5 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff888096867bb0 R08: ffff88808814ada0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809bde9f00
R13: ffff888094b30cd8 R14: ffff888094b3101c R15: ffff888094b30c00
kobject: 'kvm' (ffff8880a6eb3450): fill_kobj_path: path = '/devices/virtual/misc/kvm'
 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
kobject: 'kvm' (ffff8880a6eb3450): kobject_uevent_env
 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
kobject: 'kvm' (ffff8880a6eb3450): fill_kobj_path: path = '/devices/virtual/misc/kvm'
RIP: 0033:0x459519
RSP: 002b:00007f0b686f6c78 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: 00007f0b686f76d4
R13: 00000000004c284e R14: 00000000004d5af8 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..