=============================
[ BUG: Invalid wait context ]
syzkaller #0 Not tainted
-----------------------------
syz.2.1359/10723 is trying to lock:
ffff88802a7a9430 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x254/0xeb0 arch/x86/kvm/xen.c:1820
other info that might help us debug this:
context-{2:2}
1 lock held by syz.2.1359/10723:
 #0: ffff88802a7a9980 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
 #0: ffff88802a7a9980 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
 #0: ffff88802a7a9980 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x23a/0xeb0 arch/x86/kvm/xen.c:1818
stack backtrace:
CPU: 0 UID: 0 PID: 10723 Comm: syz.2.1359 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 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+0xa12/0x1c90 kernel/locking/lockdep.c:5187
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5825
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
 _raw_read_lock_irqsave+0x46/0x90 kernel/locking/spinlock.c:236
 kvm_xen_set_evtchn_fast+0x254/0xeb0 arch/x86/kvm/xen.c:1820
 xen_timer_callback+0x1db/0x2a0 arch/x86/kvm/xen.c:140
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x5ed/0xad0 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x8/0x20 kernel/kcov.c:320
Code: 00 00 00 e9 2a fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 0c 24 <48> 89 f2 48 89 fe bf 07 00 00 00 e9 f8 fd ff ff 0f 1f 84 00 00 00
RSP: 0018:ffffc9000358f3b8 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffea0000d3f740 RCX: ffffffff820159a6
RDX: 1ffffd40001a7ee9 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0000d3f740
R13: 0000000000000000 R14: ffffc9000358f718 R15: 000000000000001e
 const_folio_flags.constprop.0+0x36/0x70 include/linux/page-flags.h:351
 folio_test_swapcache include/linux/page-flags.h:634 [inline]
 folio_mapping+0xf9/0x190 mm/util.c:700
 folio_needs_release mm/internal.h:521 [inline]
 truncate_cleanup_folio+0xc6/0x490 mm/truncate.c:159
 truncate_inode_folio+0x3f/0x70 mm/truncate.c:175
 shmem_undo_range+0x376/0x1150 mm/shmem.c:1116
 shmem_truncate_range mm/shmem.c:1232 [inline]
 shmem_evict_inode+0x3a1/0xbe0 mm/shmem.c:1360
 evict+0x3e6/0x920 fs/inode.c:810
 iput_final fs/inode.c:1914 [inline]
 iput.part.0+0x6a9/0xb00 fs/inode.c:1966
 iput+0x35/0x40 fs/inode.c:1929
 dentry_unlink_inode+0x29c/0x480 fs/dcache.c:466
 __dentry_kill+0x1d0/0x600 fs/dcache.c:669
 dput.part.0+0x4b1/0x9b0 fs/dcache.c:911
 dput+0x1f/0x30 fs/dcache.c:901
 __fput+0x51c/0xb70 fs/file_table.c:476
 task_work_run+0x150/0x240 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x86f/0x2bf0 kernel/exit.c:966
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1107
 get_signal+0x2671/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x7c0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:40 [inline]
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 irqentry_exit_to_user_mode+0x176/0x310 kernel/entry/common.c:73
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f9b2ad8efc9
Code: Unable to access opcode bytes at 0x7f9b2ad8ef9f.
RSP: 002b:0000200000000181 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000058 RCX: 00007f9b2ad8efc9
RDX: 00007f9b2bbd6f20 RSI: 0000000000000058 RDI: 00007f9b2bbd6f20
RBP: 00007f9b2ae11f91 R08: 0000000000000000 R09: 0000000000000058
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9b2afe6038 R14: 00007f9b2afe5fa0 R15: 00007fff422f2fc8
 </TASK>
vkms_vblank_simulate: vblank timer overrun
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	00 00                	add    %al,(%rax)
   2:	e9 2a fe ff ff       	jmp    0xfffffe31
   7:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   e:	00 00 00
  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:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	f3 0f 1e fa          	endbr64
  25:	48 8b 0c 24          	mov    (%rsp),%rcx
* 29:	48 89 f2             	mov    %rsi,%rdx <-- trapping instruction
  2c:	48 89 fe             	mov    %rdi,%rsi
  2f:	bf 07 00 00 00       	mov    $0x7,%edi
  34:	e9 f8 fd ff ff       	jmp    0xfffffe31
  39:	0f                   	.byte 0xf
  3a:	1f                   	(bad)
  3b:	84 00                	test   %al,(%rax)