=============================
[ BUG: Invalid wait context ]
syzkaller #0 Not tainted
-----------------------------
syz.3.477/7106 is trying to lock:
ffff888031d55bc8 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x208/0x8d0 arch/x86/kvm/xen.c:1872
other info that might help us debug this:
context-{2:2}
locks held by syz.3.477/7106: 4, last CPU#1:
 #0: ffff88802c4f80a8 (&vcpu->mutex){+.+.}-{4:4}, at: kvm_vcpu_ioctl+0x27f/0xfd0 virt/kvm/kvm_main.c:4538
 #1: ffff888031d55b48 (&kvm->arch.xen.xen_lock){+.+.}-{4:4}, at: kvm_xen_vcpu_set_attr+0x4d/0x1230 arch/x86/kvm/xen.c:939
 #2: ffff888031d56118 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:213 [inline]
 #2: ffff888031d56118 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:320 [inline]
 #2: ffff888031d56118 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_vcpu_set_attr+0x8e/0x1230 arch/x86/kvm/xen.c:940
 #3: ffff888031d56118 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:213 [inline]
 #3: ffff888031d56118 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:320 [inline]
 #3: ffff888031d56118 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x1d2/0x8d0 arch/x86/kvm/xen.c:1870
stack backtrace:
CPU: 1 UID: 0 PID: 7106 Comm: syz.3.477 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_lock_invalid_wait_context kernel/locking/lockdep.c:4874 [inline]
 check_wait_context kernel/locking/lockdep.c:4946 [inline]
 __lock_acquire+0xf5b/0x2de0 kernel/locking/lockdep.c:5238
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:174 [inline]
 _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:271
 kvm_xen_set_evtchn_fast+0x208/0x8d0 arch/x86/kvm/xen.c:1872
 xen_timer_callback+0x109/0x220 arch/x86/kvm/xen.c:139
 __run_hrtimer kernel/time/hrtimer.c:2075 [inline]
 __hrtimer_run_queues+0x371/0xa10 kernel/time/hrtimer.c:2132
 hrtimer_interrupt+0x4cd/0xaa0 kernel/time/hrtimer.c:2251
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:221
Code: f7 e8 1d 34 a2 f5 f7 c3 00 02 00 00 74 05 e8 d0 c2 ce f5 9c 58 a9 00 02 00 00 75 29 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 24 2d 93 f5 65 48 8b 05 2c 10 dd 07 48 85 c0 74 18 5b 41 5e c3
RSP: 0018:ffffc900035ff3e8 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000246 RCX: 8000000000000001
RDX: 0000000000000007 RSI: ffffffff8e74f1c1 RDI: 0000000000000001
RBP: ffffc900035ff528 R08: ffffffff90bc9ebf R09: 1ffffffff21793d7
R10: dffffc0000000000 R11: fffffbfff21793d8 R12: 0000001cf9f40ccd
R13: ffff88802c4f9530 R14: ffff8880b85286c0 R15: dffffc0000000000
 hrtimer_start include/linux/hrtimer.h:222 [inline]
 kvm_xen_start_timer+0x37f/0x5f0 arch/x86/kvm/xen.c:308
 kvm_xen_vcpu_set_attr+0xb29/0x1230 arch/x86/kvm/xen.c:1166
 kvm_arch_vcpu_ioctl+0x1485/0x23b0 arch/x86/kvm/x86.c:3786
 kvm_vcpu_ioctl+0x7e3/0xfd0 virt/kvm/kvm_main.c:4747
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f22e1f9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f22e2ef9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f22e2225fa0 RCX: 00007f22e1f9e159
RDX: 0000200000600100 RSI: 000000004048aecb RDI: 0000000000000005
RBP: 00007f22e203506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f22e2226038 R14: 00007f22e2225fa0 R15: 00007fffdd78b588
 </TASK>
----------------
Code disassembly (best guess):
   0:	f7 e8                	imul   %eax
   2:	1d 34 a2 f5 f7       	sbb    $0xf7f5a234,%eax
   7:	c3                   	ret
   8:	00 02                	add    %al,(%rdx)
   a:	00 00                	add    %al,(%rax)
   c:	74 05                	je     0x13
   e:	e8 d0 c2 ce f5       	call   0xf5cec2e3
  13:	9c                   	pushf
  14:	58                   	pop    %rax
  15:	a9 00 02 00 00       	test   $0x200,%eax
  1a:	75 29                	jne    0x45
  1c:	f7 c3 00 02 00 00    	test   $0x200,%ebx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 24 2d 93 f5       	call   0xf5932d53 <-- trapping instruction
  2f:	65 48 8b 05 2c 10 dd 	mov    %gs:0x7dd102c(%rip),%rax        # 0x7dd1063
  36:	07
  37:	48 85 c0             	test   %rax,%rax
  3a:	74 18                	je     0x54
  3c:	5b                   	pop    %rbx
  3d:	41 5e                	pop    %r14
  3f:	c3                   	ret