rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=ecf/1/0x4000000000000000 softirq=15131/15131 fqs=5161 
	(t=10500 jiffies g=21741 q=2483)
NMI backtrace for cpu 0
CPU: 0 PID: 5750 Comm: syz-executor.2 Not tainted 5.16.0-rc5-next-20211220-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:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 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+0x262/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:604 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
 rcu_pending kernel/rcu/tree.c:3927 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2625
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:224 [inline]
RIP: 0010:pvclock_clocksource_read+0xc2/0x530 arch/x86/kernel/pvclock.c:76
Code: 03 48 89 14 24 49 01 ed 4c 8d 43 18 48 01 e8 4c 8d 7b 10 48 89 44 24 20 4c 8d 53 17 4c 8d 73 1d 83 e1 fe 89 4c 24 08 0f 01 f9 <66> 90 48 c1 e2 20 48 8b 74 24 10 4c 89 c9 48 09 d0 41 0f b6 55 00
RSP: 0018:ffffc90004077018 EFLAGS: 00000202
RAX: 00000000abf22718 RBX: ffffffff8f1a8000 RCX: 0000000000000000
RDX: 00000000000000c2 RSI: ffffffff8196bf8a RDI: ffffffff8f1a801c
RBP: dffffc0000000000 R08: ffffffff8f1a8018 R09: ffffffff8f1a800f
R10: ffffffff8f1a8017 R11: 0000000000000001 R12: ffffffff8f1a8003
R13: fffffbfff1e35001 R14: ffffffff8f1a801d R15: ffffffff8f1a8010
 kvm_clock_read arch/x86/kernel/kvmclock.c:79 [inline]
 kvm_sched_clock_read+0x14/0x40 arch/x86/kernel/kvmclock.c:91
 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:10698 [inline]
 cpu_clock_event_read+0x16/0x50 kernel/events/core.c:10731
 perf_output_read_group kernel/events/core.c:6943 [inline]
 perf_output_read+0xf02/0x1310 kernel/events/core.c:6982
 perf_output_sample+0xd12/0x1d80 kernel/events/core.c:7029
 __perf_event_output kernel/events/core.c:7514 [inline]
 perf_event_output_forward+0x119/0x280 kernel/events/core.c:7528
 __perf_event_overflow+0x13c/0x3d0 kernel/events/core.c:9228
 perf_swevent_overflow kernel/events/core.c:9304 [inline]
 perf_swevent_event+0x347/0x550 kernel/events/core.c:9332
 do_perf_sw_event kernel/events/core.c:9445 [inline]
 ___perf_sw_event+0x31a/0x570 kernel/events/core.c:9476
 __perf_sw_event+0x54/0x130 kernel/events/core.c:9488
 perf_sw_event include/linux/perf_event.h:1187 [inline]
 mm_account_fault mm/memory.c:4744 [inline]
 handle_mm_fault+0x5ef/0x790 mm/memory.c:4795
 do_user_addr_fault+0x489/0x11c0 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1484 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1540
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x30 arch/x86/lib/copy_user_64.S:196
Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 0f 82 60 ff ff ff 89 d1 <f3> a4 31 c0 0f 01 ca c3 89 ca eb 06 66 0f 1f 44 00 00 89 d1 f3 a4
RSP: 0018:ffffc90004077998 EFLAGS: 00050206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000003fcb
RDX: 0000000000008000 RSI: 0000000020fd9000 RDI: ffff88802d50c035
RBP: ffff88802d508000 R08: 0000000000000001 R09: ffff88802d50ffff
R10: ffffed1005aa1fff R11: 0000000000000000 R12: 0000000020fd4fcb
R13: 0000000020fdcfcb R14: 0000000000000000 R15: ffffc90004077d70
 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:165
 copyin lib/iov_iter.c:764 [inline]
 _copy_from_iter+0x2a3/0x1590 lib/iov_iter.c:764
 copy_from_iter include/linux/uio.h:171 [inline]
 copy_from_iter_full include/linux/uio.h:177 [inline]
 skb_do_copy_data_nocache include/net/sock.h:2188 [inline]
 skb_copy_to_page_nocache include/net/sock.h:2214 [inline]
 tcp_sendmsg_locked+0x12e9/0x3190 net/ipv4/tcp.c:1334
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1440
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:725
 __sys_sendto+0x21c/0x320 net/socket.c:2037
 __do_sys_sendto net/socket.c:2049 [inline]
 __se_sys_sendto net/socket.c:2045 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2045
 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: 0033:0x7f92f4dade99
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:00007f92f3723168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f92f4ec0f60 RCX: 00007f92f4dade99
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 000000000000000c
RBP: 00007f92f4e07ff1 R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe63d40d1f R14: 00007f92f3723300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	03 48 89             	add    -0x77(%rax),%ecx
   3:	14 24                	adc    $0x24,%al
   5:	49 01 ed             	add    %rbp,%r13
   8:	4c 8d 43 18          	lea    0x18(%rbx),%r8
   c:	48 01 e8             	add    %rbp,%rax
   f:	4c 8d 7b 10          	lea    0x10(%rbx),%r15
  13:	48 89 44 24 20       	mov    %rax,0x20(%rsp)
  18:	4c 8d 53 17          	lea    0x17(%rbx),%r10
  1c:	4c 8d 73 1d          	lea    0x1d(%rbx),%r14
  20:	83 e1 fe             	and    $0xfffffffe,%ecx
  23:	89 4c 24 08          	mov    %ecx,0x8(%rsp)
  27:	0f 01 f9             	rdtscp
* 2a:	66 90                	xchg   %ax,%ax <-- trapping instruction
  2c:	48 c1 e2 20          	shl    $0x20,%rdx
  30:	48 8b 74 24 10       	mov    0x10(%rsp),%rsi
  35:	4c 89 c9             	mov    %r9,%rcx
  38:	48 09 d0             	or     %rdx,%rax
  3b:	41 0f b6 55 00       	movzbl 0x0(%r13),%edx