rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=b75/1/0x4000000000000000 softirq=29073/29074 fqs=5073 
	(t=10500 jiffies g=45749 q=2186)
NMI backtrace for cpu 1
CPU: 1 PID: 14809 Comm: syz-executor.3 Not tainted 5.16.0-rc2-next-20211123-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+0x25e/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:3919 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2617
 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:__sanitizer_cov_trace_pc+0x4c/0x60 kernel/kcov.c:205
Code: 0e 85 c9 74 35 8b 82 ac 15 00 00 85 c0 74 2b 8b 82 88 15 00 00 83 f8 02 75 20 48 8b 8a 90 15 00 00 8b 92 8c 15 00 00 48 8b 01 <48> 83 c0 01 48 39 c2 76 07 48 89 34 c1 48 89 01 c3 0f 1f 00 41 55
RSP: 0018:ffffc90002acf110 EFLAGS: 00000246
RAX: 000000000003ffff RBX: ffffc90002acf460 RCX: ffffc9000f35e000
RDX: 0000000000040000 RSI: ffffffff819688ef RDI: ffff88807b8a8010
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88807f59062f
R10: ffffffff81968b44 R11: 0000000000000001 R12: ffffc90002acf260
R13: dffffc0000000000 R14: ffff88807b8a8000 R15: 0000000000000010
 perf_event_count kernel/events/core.c:4414 [inline]
 perf_output_read_group kernel/events/core.c:6941 [inline]
 perf_output_read+0xc0f/0x1310 kernel/events/core.c:6978
 perf_output_sample+0xd12/0x1d80 kernel/events/core.c:7025
 __perf_event_output kernel/events/core.c:7510 [inline]
 perf_event_output_forward+0x119/0x280 kernel/events/core.c:7524
 __perf_event_overflow+0x13c/0x3d0 kernel/events/core.c:9224
 perf_swevent_overflow kernel/events/core.c:9300 [inline]
 perf_swevent_event+0x347/0x550 kernel/events/core.c:9328
 do_perf_sw_event kernel/events/core.c:9441 [inline]
 ___perf_sw_event+0x31a/0x570 kernel/events/core.c:9472
 __perf_sw_event+0x54/0x130 kernel/events/core.c:9484
 perf_sw_event include/linux/perf_event.h:1176 [inline]
 mm_account_fault mm/memory.c:4743 [inline]
 handle_mm_fault+0x5ef/0x790 mm/memory.c:4794
 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:206
Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 0f 1f 80 00 00 00 00 0f 01 cb 83 fa 40 0f 82 70 ff ff ff 89 d1 <f3> a4 31 c0 0f 01 ca c3 66 2e 0f 1f 84 00 00 00 00 00 89 d1 f3 a4
RSP: 0018:ffffc90002acf9b8 EFLAGS: 00050206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000003fcb
RDX: 0000000000008000 RSI: 0000000020f99000 RDI: ffff88804cd9c035
RBP: ffff88804cd98000 R08: 0000000000000001 R09: ffff88804cd9ffff
R10: ffffed10099b3fff R11: 0000000000000000 R12: 0000000020f94fcb
R13: 0000000020f9cfcb R14: 0000000000000000 R15: ffffc90002acfd70
 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:168
 copyin lib/iov_iter.c:767 [inline]
 _copy_from_iter+0x2a3/0x1320 lib/iov_iter.c:767
 copy_from_iter include/linux/uio.h:164 [inline]
 copy_from_iter_full include/linux/uio.h:170 [inline]
 skb_do_copy_data_nocache include/net/sock.h:2175 [inline]
 skb_copy_to_page_nocache include/net/sock.h:2201 [inline]
 tcp_sendmsg_locked+0x12f3/0x3050 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:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 __sys_sendto+0x21c/0x320 net/socket.c:2036
 __do_sys_sendto net/socket.c:2048 [inline]
 __se_sys_sendto net/socket.c:2044 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2044
 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: 0033:0x7f242bb76ae9
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:00007f24290ec188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f242bc89f60 RCX: 00007f242bb76ae9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006
RBP: 00007f242bbd0f6d R08: 0000000000000000 R09: 0000000000000053
R10: 00000000fffffff1 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc3c2bb20f R14: 00007f24290ec300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	85 c9                	test   %ecx,%ecx
   2:	74 35                	je     0x39
   4:	8b 82 ac 15 00 00    	mov    0x15ac(%rdx),%eax
   a:	85 c0                	test   %eax,%eax
   c:	74 2b                	je     0x39
   e:	8b 82 88 15 00 00    	mov    0x1588(%rdx),%eax
  14:	83 f8 02             	cmp    $0x2,%eax
  17:	75 20                	jne    0x39
  19:	48 8b 8a 90 15 00 00 	mov    0x1590(%rdx),%rcx
  20:	8b 92 8c 15 00 00    	mov    0x158c(%rdx),%edx
  26:	48 8b 01             	mov    (%rcx),%rax
* 29:	48 83 c0 01          	add    $0x1,%rax <-- trapping instruction
  2d:	48 39 c2             	cmp    %rax,%rdx
  30:	76 07                	jbe    0x39
  32:	48 89 34 c1          	mov    %rsi,(%rcx,%rax,8)
  36:	48 89 01             	mov    %rax,(%rcx)
  39:	c3                   	retq
  3a:	0f 1f 00             	nopl   (%rax)
  3d:	41 55                	push   %r13