rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=f52/1/0x4000000000000000 softirq=33156/33157 fqs=4705 
	(t=10500 jiffies g=56493 q=37121)
NMI backtrace for cpu 0
CPU: 0 PID: 17297 Comm: syz-executor.5 Not tainted 5.14.0-rc7-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:105
 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:342
 print_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:700 [inline]
 rcu_pending kernel/rcu/tree.c:3922 [inline]
 rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2641
 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:1421
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x60 kernel/kcov.c:196
Code: 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 65 8b 05 99 11 8d 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 <65> 48 8b 14 25 40 f0 01 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82
RSP: 0018:ffffc90018627090 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffc900186273e0 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff819221f1 RDI: ffff88804075c3e8
RBP: 0000000000000010 R08: 0000000000000000 R09: ffff88804075c1bf
R10: ffffffff81922142 R11: 0000000000000001 R12: ffffc900186271d0
R13: dffffc0000000000 R14: 1ffff920030c4e81 R15: ffff88804075c100
 __output_copy kernel/events/internal.h:178 [inline]
 perf_output_read_group kernel/events/core.c:6889 [inline]
 perf_output_read+0xd41/0x1310 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+0x119/0x280 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:4754 [inline]
 handle_mm_fault+0x5ef/0x790 mm/memory.c:4805
 do_user_addr_fault+0x48b/0x11c0 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:ffffc90018627910 EFLAGS: 00010206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000004fcb
RDX: 0000000000008000 RSI: 0000000020ff8000 RDI: ffff88806d13b035
RBP: ffff88806d138000 R08: 0000000000000001 R09: ffff88806d13ffff
R10: ffffed100da27fff R11: 0000000000000000 R12: 0000000020ff4fcb
R13: 0000000020ffcfcb R14: 0000000000000000 R15: ffffc90018627d70
 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:718 [inline]
 _copy_from_iter+0x2a3/0x1320 lib/iov_iter.c:718
 copy_from_iter include/linux/uio.h:148 [inline]
 copy_from_iter_full include/linux/uio.h:154 [inline]
 skb_do_copy_data_nocache+0x145/0x310 include/net/sock.h:2081
 skb_copy_to_page_nocache include/net/sock.h:2107 [inline]
 tcp_sendmsg_locked+0x1239/0x2f10 net/ipv4/tcp.c:1361
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1461
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:703 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:723
 __sys_sendto+0x21c/0x320 net/socket.c:2019
 __do_sys_sendto net/socket.c:2031 [inline]
 __se_sys_sendto net/socket.c:2027 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2027
 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: 0033:0x4665f9
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:00007f4c0e25e188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007fff71ea857f R14: 00007f4c0e25e300 R15: 0000000000022000
----------------
Code disassembly (best guess):
   0:	00 4d 8b             	add    %cl,-0x75(%rbp)
   3:	03 48 0f             	add    0xf(%rax),%ecx
   6:	bd ca 49 8b 45       	mov    $0x458b49ca,%ebp
   b:	00 48 63             	add    %cl,0x63(%rax)
   e:	c9                   	leaveq
   f:	e9 64 ff ff ff       	jmpq   0xffffff78
  14:	0f 1f 00             	nopl   (%rax)
  17:	65 8b 05 99 11 8d 7e 	mov    %gs:0x7e8d1199(%rip),%eax        # 0x7e8d11b7
  1e:	89 c1                	mov    %eax,%ecx
  20:	48 8b 34 24          	mov    (%rsp),%rsi
  24:	81 e1 00 01 00 00    	and    $0x100,%ecx
* 2a:	65 48 8b 14 25 40 f0 	mov    %gs:0x1f040,%rdx <-- trapping instruction
  31:	01 00
  33:	a9 00 01 ff 00       	test   $0xff0100,%eax
  38:	74 0e                	je     0x48
  3a:	85 c9                	test   %ecx,%ecx
  3c:	74 35                	je     0x73
  3e:	8b                   	.byte 0x8b
  3f:	82                   	.byte 0x82