=============================
[ BUG: Invalid wait context ]
syzkaller #0 Not tainted
-----------------------------
syz.5.497/7906 is trying to lock:
ffff88802501d2e0 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x1fb/0x9b0 arch/x86/kvm/xen.c:1819
other info that might help us debug this:
context-{2:2}
2 locks held by syz.5.497/7906:
 #0: ffff8880348db1b8 (&u->iolock){+.+.}-{4:4}, at: __unix_dgram_recvmsg+0x1e2/0xd50 net/unix/af_unix.c:2568
 #1: ffff88802501d840 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:187 [inline]
 #1: ffff88802501d840 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:294 [inline]
 #1: ffff88802501d840 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x1c3/0x9b0 arch/x86/kvm/xen.c:1817
stack backtrace:
CPU: 1 UID: 0 PID: 7906 Comm: syz.5.497 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_lock_invalid_wait_context kernel/locking/lockdep.c:4830 [inline]
 check_wait_context kernel/locking/lockdep.c:4902 [inline]
 __lock_acquire+0xec1/0x2cf0 kernel/locking/lockdep.c:5187
 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:172 [inline]
 _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:236
 kvm_xen_set_evtchn_fast+0x1fb/0x9b0 arch/x86/kvm/xen.c:1819
 xen_timer_callback+0x109/0x220 arch/x86/kvm/xen.c:140
 __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
 __hrtimer_run_queues+0x4e7/0xcc0 kernel/time/hrtimer.c:1849
 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x460 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:finish_task_switch+0x245/0x920 kernel/sched/core.c:5152
Code: 00 00 48 85 db 0f 85 e8 01 00 00 e9 56 05 00 00 4c 8b 75 d0 49 83 c4 48 4c 89 e7 e8 25 8d 1b 0a e8 20 8e 38 00 fb 4c 8b 65 c0 <49> 8d bc 24 70 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90004bb7258 EFLAGS: 00000206
RAX: 000000000001758b RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8def4afe RDI: ffffffff8c27b380
RBP: ffffc90004bb72b0 R08: ffffffff9011aab7 R09: 1ffffffff2023556
R10: dffffc0000000000 R11: fffffbfff2023557 R12: ffff8880285e5b80
R13: dffffc0000000000 R14: ffff888026360000 R15: ffff8880b873b918
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15e5/0x52d0 kernel/sched/core.c:6908
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7092
 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
 __mutex_lock_common kernel/locking/mutex.c:624 [inline]
 __mutex_lock+0x32d/0x1300 kernel/locking/mutex.c:776
 __unix_dgram_recvmsg+0x1e2/0xd50 net/unix/af_unix.c:2568
 sock_recvmsg_nosec+0x10c/0x140 net/socket.c:1078
 ____sys_recvmsg+0x3e3/0x4a0 net/socket.c:2810
 ___sys_recvmsg+0x215/0x590 net/socket.c:2854
 do_recvmmsg+0x334/0x800 net/socket.c:2949
 __sys_recvmmsg net/socket.c:3023 [inline]
 __do_sys_recvmmsg net/socket.c:3046 [inline]
 __se_sys_recvmmsg net/socket.c:3039 [inline]
 __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3039
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f31a079c799
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:00007f31a16d5028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f31a0a16090 RCX: 00007f31a079c799
RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000009
RBP: 00007f31a0832bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f31a0a16128 R14: 00007f31a0a16090 R15: 00007f31a0b3fa48
 </TASK>
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	48 85 db             	test   %rbx,%rbx
   5:	0f 85 e8 01 00 00    	jne    0x1f3
   b:	e9 56 05 00 00       	jmp    0x566
  10:	4c 8b 75 d0          	mov    -0x30(%rbp),%r14
  14:	49 83 c4 48          	add    $0x48,%r12
  18:	4c 89 e7             	mov    %r12,%rdi
  1b:	e8 25 8d 1b 0a       	call   0xa1b8d45
  20:	e8 20 8e 38 00       	call   0x388e45
  25:	fb                   	sti
  26:	4c 8b 65 c0          	mov    -0x40(%rbp),%r12
* 2a:	49 8d bc 24 70 16 00 	lea    0x1670(%r12),%rdi <-- trapping instruction
  31:	00
  32:	48 89 f8             	mov    %rdi,%rax
  35:	48 c1 e8 03          	shr    $0x3,%rax
  39:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
  3e:	84 c0                	test   %al,%al