rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=dab/1/0x4000000000000000 softirq=93110/93110 fqs=5248 
	(t=10502 jiffies g=153865 q=1289)
NMI backtrace for cpu 0
CPU: 0 PID: 25581 Comm: syz-executor.0 Not tainted 5.17.0-rc2-syzkaller-00071-g1f2cfdd349b7 #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:check_kcov_mode+0x31/0x40 kernel/kcov.c:178
Code: 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b 96 a4 15 00 00 85 d2 74 0b 8b 86 80 15 00 00 39 f8 0f 94 c0 <c3> 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 31 c0 65 8b 15 e7 c5
RSP: 0018:ffffc90004dbf108 EFLAGS: 00000297
RAX: 0000000000000000 RBX: ffffc90004dbf460 RCX: 0000000000000004
RDX: 0000000000000000 RSI: ffff8880243e4140 RDI: 0000000000000003
RBP: 0000000001b9afb4 R08: 0000000000000000 R09: ffff888036b560bf
R10: ffffffff8196e422 R11: 0000000000000001 R12: ffff888036b560b8
R13: dffffc0000000000 R14: 0000000000000004 R15: ffff888036b56000
 write_comp_data kernel/kcov.c:221 [inline]
 __sanitizer_cov_trace_const_cmp8+0x1d/0x70 kernel/kcov.c:294
 perf_output_read_group kernel/events/core.c:7007 [inline]
 perf_output_read+0xc92/0x1310 kernel/events/core.c:7043
 perf_output_sample+0xd12/0x1d40 kernel/events/core.c:7090
 __perf_event_output kernel/events/core.c:7575 [inline]
 perf_event_output_forward+0x119/0x280 kernel/events/core.c:7589
 __perf_event_overflow+0x13c/0x3d0 kernel/events/core.c:9289
 perf_swevent_overflow kernel/events/core.c:9365 [inline]
 perf_swevent_event+0x347/0x550 kernel/events/core.c:9393
 do_perf_sw_event kernel/events/core.c:9506 [inline]
 ___perf_sw_event+0x31a/0x570 kernel/events/core.c:9537
 __perf_sw_event+0x54/0x130 kernel/events/core.c:9549
 perf_sw_event include/linux/perf_event.h:1178 [inline]
 mm_account_fault mm/memory.c:4766 [inline]
 handle_mm_fault+0x5ef/0x790 mm/memory.c:4817
 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/0x40 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 83 f8 12 74
RSP: 0018:ffffc90004dbf9a0 EFLAGS: 00050206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000006fcb
RDX: 0000000000008000 RSI: 0000000020f2e000 RDI: ffff88802fdf1035
RBP: ffff88802fdf0000 R08: 0000000000000001 R09: ffff88802fdf7fff
R10: ffffed1005fbefff R11: 0000000000000000 R12: 0000000020f2cfcb
R13: 0000000020f34fcb R14: 0000000000000000 R15: ffffc90004dbfd70
 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:166
 copyin lib/iov_iter.c:765 [inline]
 _copy_from_iter+0x2a3/0x1410 lib/iov_iter.c:765
 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:2189 [inline]
 skb_copy_to_page_nocache include/net/sock.h:2215 [inline]
 tcp_sendmsg_locked+0x12f3/0x3050 net/ipv4/tcp.c:1335
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1441
 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: 0033:0x7fc87fc0d059
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc87e582168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fc87fd1ff60 RCX: 00007fc87fc0d059
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000014
RBP: 00007fc87fc6708d R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd7f4c010f R14: 00007fc87e582300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	89 c2                	mov    %eax,%edx
   2:	81 e2 00 01 00 00    	and    $0x100,%edx
   8:	a9 00 01 ff 00       	test   $0xff0100,%eax
   d:	74 10                	je     0x1f
   f:	31 c0                	xor    %eax,%eax
  11:	85 d2                	test   %edx,%edx
  13:	74 15                	je     0x2a
  15:	8b 96 a4 15 00 00    	mov    0x15a4(%rsi),%edx
  1b:	85 d2                	test   %edx,%edx
  1d:	74 0b                	je     0x2a
  1f:	8b 86 80 15 00 00    	mov    0x1580(%rsi),%eax
  25:	39 f8                	cmp    %edi,%eax
  27:	0f 94 c0             	sete   %al
* 2a:	c3                   	retq <-- trapping instruction
  2b:	66 66 2e 0f 1f 84 00 	data16 nopw %cs:0x0(%rax,%rax,1)
  32:	00 00 00 00
  36:	0f 1f 00             	nopl   (%rax)
  39:	31 c0                	xor    %eax,%eax
  3b:	65                   	gs
  3c:	8b                   	.byte 0x8b
  3d:	15                   	.byte 0x15
  3e:	e7 c5                	out    %eax,$0xc5