rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=38a/1/0x4000000000000000 softirq=11996/11996 fqs=5087 
	(t=10500 jiffies g=14949 q=1124)
NMI backtrace for cpu 0
CPU: 0 PID: 10414 Comm: syz-executor.0 Tainted: G        W         5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:341
 print_cpu_stall kernel/rcu/tree_stall.h:624 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:699 [inline]
 rcu_pending kernel/rcu/tree.c:3911 [inline]
 rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2649
 update_process_times+0x16d/0x200 kernel/time/timer.c:1796
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__pvclock_read_cycles arch/x86/include/asm/pvclock.h:84 [inline]
RIP: 0010:pvclock_clocksource_read+0xef/0x530 arch/x86/kernel/pvclock.c:76
Code: c1 e2 20 48 8b 74 24 10 4c 89 c9 48 09 d0 41 0f b6 55 00 48 c1 e9 03 0f b6 0c 29 83 e6 07 40 38 f2 40 0f 9e c6 84 d2 0f 95 c2 <40> 84 d6 0f 85 71 03 00 00 4c 89 ca 83 e2 07 38 d1 40 0f 9e c6 84
RSP: 0018:ffffc90017926f58 EFLAGS: 00000246
RAX: 000000a05d0bde21 RBX: ffffffff8f69c000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8f69c01c
RBP: dffffc0000000000 R08: ffffffff8f69c018 R09: ffffffff8f69c00f
R10: ffffffff8f69c017 R11: 0000000000000001 R12: ffffffff8f69c003
R13: fffffbfff1ed3801 R14: ffffffff8f69c01d R15: ffffffff8f69c010
 kvm_clock_read arch/x86/kernel/kvmclock.c:88 [inline]
 kvm_sched_clock_read+0x14/0x40 arch/x86/kernel/kvmclock.c:100
 sched_clock_cpu+0x15/0x1f0 kernel/sched/clock.c:371
 local_clock include/linux/sched/clock.h:84 [inline]
 cpu_clock_event_update kernel/events/core.c:10617 [inline]
 cpu_clock_event_read+0x16/0x50 kernel/events/core.c:10650
 perf_output_read_group kernel/events/core.c:6883 [inline]
 perf_output_read+0xf02/0x1310 kernel/events/core.c:6922
 perf_output_sample+0xd12/0x1d80 kernel/events/core.c:6969
 __perf_event_output kernel/events/core.c:7454 [inline]
 perf_event_output_forward+0x132/0x270 kernel/events/core.c:7468
 __perf_event_overflow+0x13c/0x3d0 kernel/events/core.c:9140
 perf_swevent_overflow kernel/events/core.c:9216 [inline]
 perf_swevent_event+0x347/0x550 kernel/events/core.c:9244
 do_perf_sw_event kernel/events/core.c:9357 [inline]
 ___perf_sw_event+0x31a/0x570 kernel/events/core.c:9388
 __perf_sw_event+0x54/0x130 kernel/events/core.c:9400
 perf_sw_event include/linux/perf_event.h:1170 [inline]
 mm_account_fault mm/memory.c:4616 [inline]
 handle_mm_fault+0x5e6/0x7f0 mm/memory.c:4667
 do_user_addr_fault+0x483/0x1210 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:206
Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 1f 00 c3 0f 1f 80 00 00 00 00 0f 1f 00 83 fa 40 0f 82 70 ff ff ff 89 d1 <f3> a4 31 c0 0f 1f 00 c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 83 f8
RSP: 0018:ffffc900179278f8 EFLAGS: 00010206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000003fcb
RDX: 0000000000008000 RSI: 0000000020ff9000 RDI: ffff888081eb4035
RBP: ffff888081eb0000 R08: 0000000000000001 R09: ffff888081eb7fff
R10: ffffed10103d6fff R11: 0000000000000000 R12: 0000000020ff4fcb
R13: 0000000020ffcfcb R14: 0000000000000000 R15: ffffc90017927da0
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline]
 copyin.part.0+0xe4/0x110 lib/iov_iter.c:201
 copyin lib/iov_iter.c:834 [inline]
 _copy_from_iter_full+0x299/0x11c0 lib/iov_iter.c:834
 copy_from_iter_full include/linux/uio.h:163 [inline]
 skb_do_copy_data_nocache+0x145/0x2c0 include/net/sock.h:2078
 skb_copy_to_page_nocache include/net/sock.h:2104 [inline]
 tcp_sendmsg_locked+0x1360/0x2e60 net/ipv4/tcp.c:1361
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1458
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:702 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:722
 __sys_sendto+0x21c/0x320 net/socket.c:2012
 __do_sys_sendto net/socket.c:2024 [inline]
 __se_sys_sendto net/socket.c:2020 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2020
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbc594b3188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000007
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fff2d8e470f R14: 00007fbc594b3300 R15: 0000000000022000
vkms_vblank_simulate: vblank timer overrun