=============================
[ BUG: Invalid wait context ]
syzkaller #0 Tainted: G                   Y
-----------------------------
syz.0.84/6085 is trying to lock:
ffff8880691adbc8 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x255/0xd70 arch/x86/kvm/xen.c:1872
other info that might help us debug this:
context-{2:2}
locks held by syz.0.84/6085: 4, last CPU#1:
 #0: ffff88807a09a928 (&vcpu->mutex){+.+.}-{4:4}, at: kvm_vcpu_ioctl+0x322/0x17b0 virt/kvm/kvm_main.c:4543
 #1: ffff8880691adb48 (&kvm->arch.xen.xen_lock){+.+.}-{4:4}, at: kvm_xen_vcpu_set_attr+0x49/0x13a0 arch/x86/kvm/xen.c:939
 #2: ffff8880691ae118 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:213 [inline]
 #2: ffff8880691ae118 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:320 [inline]
 #2: ffff8880691ae118 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_vcpu_set_attr+0xa6/0x13a0 arch/x86/kvm/xen.c:940
 #3: ffff8880691ae118 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:213 [inline]
 #3: ffff8880691ae118 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:320 [inline]
 #3: ffff8880691ae118 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x23b/0xd70 arch/x86/kvm/xen.c:1870
stack backtrace:
CPU: 1 UID: 0 PID: 6085 Comm: syz.0.84 Tainted: G                   Y syzkaller #0 PREEMPT(full) 
Tainted: [Y]=FORCED_BIND
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 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+0xfcc/0x1f40 kernel/locking/lockdep.c:5238
 lock_acquire kernel/locking/lockdep.c:5942 [inline]
 lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:174 [inline]
 _raw_read_lock_irqsave+0x46/0x90 kernel/locking/spinlock.c:271
 kvm_xen_set_evtchn_fast+0x255/0xd70 arch/x86/kvm/xen.c:1872
 xen_timer_callback+0x1db/0x2a0 arch/x86/kvm/xen.c:139
 __run_hrtimer kernel/time/hrtimer.c:2075 [inline]
 __hrtimer_run_queues+0x135/0x9a0 kernel/time/hrtimer.c:2132
 hrtimer_interrupt+0x441/0xaa0 kernel/time/hrtimer.c:2251
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x9e/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+0x31/0x80 kernel/locking/spinlock.c:221
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 86 64 00 f6 48 89 df e8 0e bb 00 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 05 81 ef f5 65 48 83 3d 04 b0 cd 09 00 74 16 5b
RSP: 0018:ffffc90006077728 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff8880b8128840 RCX: 0000000000000080
RDX: 0000000000000001 RSI: ffffffff8e613628 RDI: ffffffff8c831080
RBP: 0000000000000246 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88807a09bdc0
R13: 0000000000000001 R14: ffff88807a09bdb0 R15: ffff88807a09bdb8
 hrtimer_start include/linux/hrtimer.h:222 [inline]
 kvm_xen_start_timer+0x360/0x740 arch/x86/kvm/xen.c:308
 kvm_xen_vcpu_set_attr+0xaec/0x13a0 arch/x86/kvm/xen.c:1166
 kvm_arch_vcpu_ioctl+0xc95/0x39f0 arch/x86/kvm/x86.c:3843
 kvm_vcpu_ioctl+0x8a3/0x17b0 virt/kvm/kvm_main.c:4752
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff6d2b9f559
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:00007ff6d3af1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff6d2e26090 RCX: 00007ff6d2b9f559
RDX: 0000200000001040 RSI: 000000004048aecb RDI: 0000000000000005
RBP: 00007ff6d2c36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff6d2e26128 R14: 00007ff6d2e26090 R15: 00007fff435c85f8
 </TASK>
----------------
Code disassembly (best guess):
   0:	f5                   	cmc
   1:	53                   	push   %rbx
   2:	48 8b 74 24 10       	mov    0x10(%rsp),%rsi
   7:	48 89 fb             	mov    %rdi,%rbx
   a:	48 83 c7 18          	add    $0x18,%rdi
   e:	e8 86 64 00 f6       	call   0xf6006499
  13:	48 89 df             	mov    %rbx,%rdi
  16:	e8 0e bb 00 f6       	call   0xf600bb29
  1b:	f7 c5 00 02 00 00    	test   $0x200,%ebp
  21:	75 23                	jne    0x46
  23:	9c                   	pushf
  24:	58                   	pop    %rax
  25:	f6 c4 02             	test   $0x2,%ah
  28:	75 37                	jne    0x61
* 2a:	bf 01 00 00 00       	mov    $0x1,%edi <-- trapping instruction
  2f:	e8 05 81 ef f5       	call   0xf5ef8139
  34:	65 48 83 3d 04 b0 cd 	cmpq   $0x0,%gs:0x9cdb004(%rip)        # 0x9cdb041
  3b:	09 00
  3d:	74 16                	je     0x55
  3f:	5b                   	pop    %rbx