=============================
[ BUG: Invalid wait context ]
syzkaller #0 Not tainted
-----------------------------
dhcpcd/5321 is trying to lock:
ffff8880520e5bb0 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x1f4/0x9a0 arch/x86/kvm/xen.c:1822
other info that might help us debug this:
context-{2:2}
2 locks held by dhcpcd/5321:
 #0: ffff88801255d038 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_downgrade include/linux/mmap_lock.h:586 [inline]
 #0: ffff88801255d038 (&mm->mmap_lock){++++}-{4:4}, at: vms_complete_munmap_vmas+0x224/0xbe0 mm/vma.c:1340
 #1: ffff8880520e6110 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:187 [inline]
 #1: ffff8880520e6110 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:294 [inline]
 #1: ffff8880520e6110 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x1bc/0x9a0 arch/x86/kvm/xen.c:1820
stack backtrace:
CPU: 0 UID: 0 PID: 5321 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
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+0xe39/0x2cf0 kernel/locking/lockdep.c:5187
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:174 [inline]
 _raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:240
 kvm_xen_set_evtchn_fast+0x1f4/0x9a0 arch/x86/kvm/xen.c:1822
 xen_timer_callback+0x109/0x220 arch/x86/kvm/xen.c:140
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x371/0xa10 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2215
 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:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x10/0x70 kernel/kcov.c:217
Code: de 5b e9 53 ab 63 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 48 5e a6 11 <65> 8b 15 69 5e a6 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc9000e0bf818 EFLAGS: 00000297
RAX: ffffffff8225d8ff RBX: ffff8880430c8dc0 RCX: ffff888000704a80
RDX: 0000000000000000 RSI: 00007fd3f8a84000 RDI: 00007fd3f8a84000
RBP: ffffc9000e0bf950 R08: ffff888000704a80 R09: 0000000000000005
R10: 0000000000000004 R11: 0000000000000000 R12: 00007fd3f8a84000
R13: 0000000000000010 R14: dffffc0000000000 R15: 0000000000000000
 validate_mm+0x36f/0x4f0 mm/vma.c:-1
 vms_complete_munmap_vmas+0x925/0xbe0 mm/vma.c:1364
 do_vmi_align_munmap+0x3b7/0x4b0 mm/vma.c:1604
 do_vmi_munmap+0x252/0x2d0 mm/vma.c:1652
 __vm_munmap+0x241/0x3e0 mm/vma.c:3288
 __do_sys_munmap mm/mmap.c:1079 [inline]
 __se_sys_munmap mm/mmap.c:1076 [inline]
 __x64_sys_munmap+0x60/0x70 mm/mmap.c:1076
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd3f8cce2e7
Code: 00 00 00 b8 0a 00 00 00 0f 05 48 3d 01 f0 ff ff 73 01 c3 48 8d 0d c9 3f 01 00 f7 d8 89 01 48 83 c8 ff c3 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8d 0d a9 3f 01 00 f7 d8 89 01 48 83
RSP: 002b:00007ffdff82fd08 EFLAGS: 00000202 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 000055e066cca960 RCX: 00007fd3f8cce2e7
RDX: 0000000000000001 RSI: 0000000000029910 RDI: 00007fd3f8a90000
RBP: 00007ffdff82fe10 R08: 00000000000004f0 R09: 0000000000000002
R10: 00007ffdff82fc40 R11: 0000000000000202 R12: 00007ffdff82fd48
R13: 00007fd3f8ce1000 R14: 000055e066cca960 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	de 5b e9             	ficomps -0x17(%rbx)
   3:	53                   	push   %rbx
   4:	ab                   	stos   %eax,%es:(%rdi)
   5:	63 00                	movsxd (%rax),%eax
   7:	cc                   	int3
   8:	cc                   	int3
   9:	cc                   	int3
   a:	90                   	nop
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	f3 0f 1e fa          	endbr64
  1e:	48 8b 04 24          	mov    (%rsp),%rax
  22:	65 48 8b 0d 48 5e a6 	mov    %gs:0x11a65e48(%rip),%rcx        # 0x11a65e72
  29:	11
* 2a:	65 8b 15 69 5e a6 11 	mov    %gs:0x11a65e69(%rip),%edx        # 0x11a65e9a <-- trapping instruction
  31:	81 e2 00 01 ff 00    	and    $0xff0100,%edx
  37:	74 11                	je     0x4a
  39:	81 fa 00 01 00 00    	cmp    $0x100,%edx
  3f:	75                   	.byte 0x75