rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=e5d/1/0x4000000000000000 softirq=9119/9119 fqs=5091 
	(t=10500 jiffies g=12013 q=1595)
NMI backtrace for cpu 0
CPU: 0 PID: 4332 Comm: syz-executor.0 Not tainted 5.16.0-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: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+0x5c/0x759 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+0x50/0x60 kernel/kcov.c:206
Code: 35 8b 82 a4 15 00 00 85 c0 74 2b 8b 82 80 15 00 00 83 f8 02 75 20 48 8b 8a 88 15 00 00 8b 92 84 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 41 54 49 89
RSP: 0018:ffffc9000f3e7110 EFLAGS: 00000216
RAX: 0000000000040000 RBX: ffffc9000f3e7460 RCX: ffffc90002d89000
RDX: 0000000000040000 RSI: ffffffff8195e80f RDI: ffff8880285b65f0
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff88807a60e457
R10: ffffffff8195ea64 R11: 0000000000000001 R12: ffffc9000f3e7260
R13: dffffc0000000000 R14: ffff8880285b65e0 R15: 0000000000000010
 perf_event_count kernel/events/core.c:4418 [inline]
 perf_output_read_group kernel/events/core.c:6928 [inline]
 perf_output_read+0xc0f/0x1310 kernel/events/core.c:6965
 perf_output_sample+0xd12/0x1d80 kernel/events/core.c:7012
 __perf_event_output kernel/events/core.c:7497 [inline]
 perf_event_output_forward+0x119/0x280 kernel/events/core.c:7511
 __perf_event_overflow+0x13c/0x3d0 kernel/events/core.c:9211
 perf_swevent_overflow kernel/events/core.c:9287 [inline]
 perf_swevent_event+0x347/0x550 kernel/events/core.c:9315
 do_perf_sw_event kernel/events/core.c:9428 [inline]
 ___perf_sw_event+0x31a/0x570 kernel/events/core.c:9459
 __perf_sw_event+0x54/0x130 kernel/events/core.c:9471
 perf_sw_event include/linux/perf_event.h:1185 [inline]
 mm_account_fault mm/memory.c:4747 [inline]
 handle_mm_fault+0x5ef/0x790 mm/memory.c:4798
 do_user_addr_fault+0x489/0x11c0 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1485 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1541
 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 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 83 f8 12 74
RSP: 0018:ffffc9000f3e79b8 EFLAGS: 00050206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000004fcb
RDX: 0000000000008000 RSI: 0000000020f38000 RDI: ffff88803751b035
RBP: ffff888037518000 R08: 0000000000000001 R09: ffff88803751ffff
R10: ffffed1006ea3fff R11: 0000000000000000 R12: 0000000020f34fcb
R13: 0000000020f3cfcb R14: 0000000000000000 R15: ffffc9000f3e7d70
 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:2189 [inline]
 skb_copy_to_page_nocache include/net/sock.h:2215 [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:819
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:725
 __sys_sendto+0x21c/0x320 net/socket.c:2040
 __do_sys_sendto net/socket.c:2052 [inline]
 __se_sys_sendto net/socket.c:2048 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2048
 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: 0033:0x7fe4f8b52eb9
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:00007fe4f74c8168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fe4f8c65f60 RCX: 00007fe4f8b52eb9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 000000000000000f
RBP: 00007fe4f8bad08d R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe506b90ef R14: 00007fe4f74c8300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	35 8b 82 a4 15       	xor    $0x15a4828b,%eax
   5:	00 00                	add    %al,(%rax)
   7:	85 c0                	test   %eax,%eax
   9:	74 2b                	je     0x36
   b:	8b 82 80 15 00 00    	mov    0x1580(%rdx),%eax
  11:	83 f8 02             	cmp    $0x2,%eax
  14:	75 20                	jne    0x36
  16:	48 8b 8a 88 15 00 00 	mov    0x1588(%rdx),%rcx
  1d:	8b 92 84 15 00 00    	mov    0x1584(%rdx),%edx
  23:	48 8b 01             	mov    (%rcx),%rax
  26:	48 83 c0 01          	add    $0x1,%rax
* 2a:	48 39 c2             	cmp    %rax,%rdx <-- trapping instruction
  2d:	76 07                	jbe    0x36
  2f:	48 89 34 c1          	mov    %rsi,(%rcx,%rax,8)
  33:	48 89 01             	mov    %rax,(%rcx)
  36:	c3                   	retq
  37:	0f 1f 00             	nopl   (%rax)
  3a:	41 55                	push   %r13
  3c:	41 54                	push   %r12
  3e:	49                   	rex.WB
  3f:	89                   	.byte 0x89