=============================
[ BUG: Invalid wait context ]
6.15.0-rc6-syzkaller-00051-g405e6c37c89e #0 Not tainted
-----------------------------
syz.1.127/6420 is trying to lock:
ffffc9001b3ea410 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x1fb/0x9a0 arch/x86/kvm/xen.c:1819
other info that might help us debug this:
context-{2:2}
1 lock held by syz.1.127/6420:
 #0: ffffc9001b3ea958 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
 #0: ffffc9001b3ea958 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
 #0: ffffc9001b3ea958 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x1c3/0x9a0 arch/x86/kvm/xen.c:1817
stack backtrace:
CPU: 1 UID: 0 PID: 6420 Comm: syz.1.127 Not tainted 6.15.0-rc6-syzkaller-00051-g405e6c37c89e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_lock_invalid_wait_context kernel/locking/lockdep.c:4831 [inline]
 check_wait_context kernel/locking/lockdep.c:4903 [inline]
 __lock_acquire+0xbcf/0xd20 kernel/locking/lockdep.c:5185
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
 _raw_read_lock_irqsave+0xaf/0x100 kernel/locking/spinlock.c:236
 kvm_xen_set_evtchn_fast+0x1fb/0x9a0 arch/x86/kvm/xen.c:1819
 xen_timer_callback+0x109/0x220 arch/x86/kvm/xen.c:140
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x4e0/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x89/0x2b0 mm/kasan/generic.c:189
Code: 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 41 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 <0f> 85 de 01 00 00 49 ff c3 48 ff c3 75 ee e9 21 01 00 00 44 89 dd
RSP: 0018:ffffc9001b16f920 EFLAGS: 00000246
RAX: 1ffff110041f3b01 RBX: ffffffffffffffff RCX: ffffffff819209da
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88807dbbdac0
RBP: ffffc9001b16f9b0 R08: ffff88807dbbdac3 R09: 1ffff1100fb77b58
R10: dffffc0000000000 R11: ffffed100fb77b58 R12: 0000000000000001
R13: dffffc0000000000 R14: ffffed100fb77b59 R15: 1ffff1100fb77b58
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
 membarrier_mm_sync_core_before_usermode include/linux/sched/mm.h:543 [inline]
 finish_task_switch+0x2fa/0x950 kernel/sched/core.c:5274
 context_switch kernel/sched/core.c:5385 [inline]
 __schedule+0x16ea/0x4cd0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6860
 do_nanosleep+0x1c7/0x600 kernel/time/hrtimer.c:2100
 hrtimer_nanosleep+0x169/0x360 kernel/time/hrtimer.c:2147
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1407 [inline]
 __se_sys_clock_nanosleep+0x2f1/0x380 kernel/time/posix-timers.c:1384
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0ffafc1225
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007f0ffb2dfb20 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007f0ffb1b5fa0 RCX: 00007f0ffafc1225
RDX: 00007f0ffb2dfb60 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f0ffb1b7ba0 R08: 0000000000000000 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000023bb2
R13: 00007f0ffb1b6240 R14: ffffffffffffffff R15: 00007f0ffb2dfca0
 </TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	df 4d 8d             	fisttps -0x73(%rbp)
   3:	34 19                	xor    $0x19,%al
   5:	4d 89 f4             	mov    %r14,%r12
   8:	4d 29 dc             	sub    %r11,%r12
   b:	49 83 fc 10          	cmp    $0x10,%r12
   f:	7f 29                	jg     0x3a
  11:	4d 85 e4             	test   %r12,%r12
  14:	0f 84 41 01 00 00    	je     0x15b
  1a:	4c 89 cb             	mov    %r9,%rbx
  1d:	48 f7 d3             	not    %rbx
  20:	4c 01 fb             	add    %r15,%rbx
  23:	41 80 3b 00          	cmpb   $0x0,(%r11)
* 27:	0f 85 de 01 00 00    	jne    0x20b <-- trapping instruction
  2d:	49 ff c3             	inc    %r11
  30:	48 ff c3             	inc    %rbx
  33:	75 ee                	jne    0x23
  35:	e9 21 01 00 00       	jmp    0x15b
  3a:	44 89 dd             	mov    %r11d,%ebp