rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=1c5/1/0x4000000000000000 softirq=80700/80700 fqs=5231 
	(t=10502 jiffies g=142241 q=743)
NMI backtrace for cpu 1
CPU: 1 PID: 31019 Comm: syz-executor.1 Not tainted 5.16.0-rc4-next-20211207-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:bytes_is_nonzero mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0xde/0x180 mm/kasan/generic.c:189
Code: 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 50 80 38 00 <74> f2 eb d4 41 bc 08 00 00 00 48 89 ea 45 29 dc 4d 8d 1c 2c eb 0c
RSP: 0018:ffffc900050170d8 EFLAGS: 00000246
RAX: ffffed10093ac1a1 RBX: ffffed10093ac1a3 RCX: ffffffff8196a23a
RDX: ffffed10093ac1a3 RSI: 0000000000000010 RDI: ffff888049d60d08
RBP: ffffed10093ac1a1 R08: 0000000000000001 R09: ffff888049d60d17
R10: ffffed10093ac1a2 R11: 0000000000000001 R12: 0000000000000010
R13: ffff888049d60d08 R14: 1ffff92000a02e91 R15: 0000000000000010
 memcpy+0x39/0x60 mm/kasan/shadow.c:66
 memcpy include/linux/fortify-string.h:225 [inline]
 memcpy_common kernel/events/internal.h:174 [inline]
 __output_copy kernel/events/internal.h:178 [inline]
 perf_output_read_group kernel/events/core.c:6945 [inline]
 perf_output_read+0xd7a/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:ffffc900050179b8 EFLAGS: 00050206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000001fcb
RDX: 0000000000008000 RSI: 0000000020f7b000 RDI: ffff88804a9c6035
RBP: ffff88804a9c0000 R08: 0000000000000001 R09: ffff88804a9c7fff
R10: ffffed1009538fff R11: 0000000000000000 R12: 0000000020f74fcb
R13: 0000000020f7cfcb R14: 0000000000000000 R15: ffffc90005017d70
 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+0x2a3/0x11c0 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:2185 [inline]
 skb_copy_to_page_nocache include/net/sock.h:2211 [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: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: 0033:0x7fcb0868caf9
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:00007fcb07602188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fcb0879ff60 RCX: 00007fcb0868caf9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006
RBP: 00007fcb086e6ff7 R08: 0000000000000000 R09: 0000000000000053
R10: 00000000fffffff1 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc12ab7def R14: 00007fcb07602300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	74 f2                	je     0xfffffff4
   2:	48 89 c2             	mov    %rax,%rdx
   5:	b8 01 00 00 00       	mov    $0x1,%eax
   a:	48 85 d2             	test   %rdx,%rdx
   d:	75 56                	jne    0x65
   f:	5b                   	pop    %rbx
  10:	5d                   	pop    %rbp
  11:	41 5c                	pop    %r12
  13:	c3                   	retq
  14:	48 85 d2             	test   %rdx,%rdx
  17:	74 5e                	je     0x77
  19:	48 01 ea             	add    %rbp,%rdx
  1c:	eb 09                	jmp    0x27
  1e:	48 83 c0 01          	add    $0x1,%rax
  22:	48 39 d0             	cmp    %rdx,%rax
  25:	74 50                	je     0x77
  27:	80 38 00             	cmpb   $0x0,(%rax)
* 2a:	74 f2                	je     0x1e <-- trapping instruction
  2c:	eb d4                	jmp    0x2
  2e:	41 bc 08 00 00 00    	mov    $0x8,%r12d
  34:	48 89 ea             	mov    %rbp,%rdx
  37:	45 29 dc             	sub    %r11d,%r12d
  3a:	4d 8d 1c 2c          	lea    (%r12,%rbp,1),%r11
  3e:	eb 0c                	jmp    0x4c