kvm: KVM_SET_TSS_ADDR need to be called before entering vcpu
WARNING: CPU: 0 PID: 4689 at arch/x86/kernel/traps.c:801 cond_local_irq_disable arch/x86/kernel/traps.c:86 [inline]
WARNING: CPU: 0 PID: 4689 at arch/x86/kernel/traps.c:801 do_debug+0x4d8/0x6e0 arch/x86/kernel/traps.c:815
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 4689 Comm: syz-executor6 Not tainted 4.15.0-rc5+ #147
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <#DB>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1061
RIP: 0010:cond_local_irq_disable arch/x86/kernel/traps.c:86 [inline]
RIP: 0010:do_debug+0x4d8/0x6e0 arch/x86/kernel/traps.c:815
RSP: 0018:fffffe800000ee98 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: fffffe800000ef58 RCX: 0000000000000006
RDX: 1fffffd000001dfc RSI: 1ffff1003838c53b RDI: ffffffff85ec81f8
RBP: fffffe800000ef48 R08: fffffe800000efe8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000e001
R13: ffff8801c1c62140 R14: 1fffffd000001dd8 R15: 0000000000004000
 debug+0x34/0x60 arch/x86/entry/entry_64.S:1214
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:180
RSP: 0018:ffff8801c167f020 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000020000000 RCX: 000000000000100f
RDX: 0000000000001010 RSI: 0000000020000001 RDI: ffff8801c18ac681
RBP: ffff8801c167f060 R08: ffff8801db002080 R09: ffff8801c18ac680
R10: 0000000000000202 R11: ffffed0038315ad1 R12: 0000000000001010
R13: 0000000000001010 R14: ffff8801c498f800 R15: ffff8801c18ac680
 </#DB>
 sctp_getsockopt_connectx3 net/sctp/socket.c:1456 [inline]
 sctp_getsockopt+0x3f0d/0x70c0 net/sctp/socket.c:7056
 compat_sock_common_getsockopt+0x104/0x140 net/core/sock.c:2940
 C_SYSC_getsockopt net/compat.c:523 [inline]
 compat_SyS_getsockopt+0x182/0x420 net/compat.c:506
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7f75c79
RSP: 002b:00000000f7f7108c EFLAGS: 00000296 ORIG_RAX: 000000000000016d
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000084
RDX: 000000000000006f RSI: 00000000205adff7 RDI: 00000000205adffc
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..