rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=652/1/0x4000000000000002 softirq=29557/29558 fqs=4719 
rcu: 	 (t=10500 jiffies g=14741 q=23123)
NMI backtrace for cpu 1
CPU: 1 PID: 9630 Comm: syz-executor649 Not tainted 4.19.97-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:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x189/0x1d5 kernel/rcu/tree.c:1340
 print_cpu_stall kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0x5e3/0xd90 kernel/rcu/tree.c:2682
 update_process_times+0x32/0x80 kernel/time/timer.c:1638
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:164
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1401 [inline]
 __hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
 </IRQ>
RIP: 0010:perf_output_read_group kernel/events/core.c:6172 [inline]
RIP: 0010:perf_output_read+0xf65/0x1390 kernel/events/core.c:6211
Code: ff 0f 85 fb fc ff ff e9 09 f7 ff ff e8 34 29 eb ff 49 8d be 98 00 00 00 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 67 03 00 00 <49> 8b 9e 98 00 00 00 48 8d bb a0 00 00 00 48 89 f8 48 c1 e8 03 42
RSP: 0018:ffff8880a7f97020 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff11012f12423 RBX: 0000000000000001 RCX: ffffffff817fe9c2
RDX: 0000000000000000 RSI: ffffffff817fec8c RDI: ffff888097892118
RBP: ffff8880a7f97208 R08: ffff8880987f4500 R09: ffffed101152eadf
R10: ffffed101152eade R11: ffff88808a9756f7 R12: 0000000000000010
R13: dffffc0000000000 R14: ffff888097892080 R15: ffff8880a7f97388
 perf_output_sample+0x13b6/0x1a90 kernel/events/core.c:6253
 __perf_event_output kernel/events/core.c:6575 [inline]
 perf_event_output_forward+0x150/0x290 kernel/events/core.c:6588
 __perf_event_overflow+0x141/0x370 kernel/events/core.c:7834
 perf_swevent_overflow+0xaa/0x140 kernel/events/core.c:7910
 perf_swevent_event+0x1f7/0x2f0 kernel/events/core.c:7943
 do_perf_sw_event kernel/events/core.c:8051 [inline]
 ___perf_sw_event+0x31c/0x570 kernel/events/core.c:8082
 __perf_sw_event+0x51/0xa0 kernel/events/core.c:8094
 perf_sw_event include/linux/perf_event.h:1064 [inline]
 __do_page_fault+0x7a6/0xe90 arch/x86/mm/fault.c:1431
 do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1465
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1204
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20 arch/x86/lib/copy_user_64.S:181
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 0f 1f 00 83
RSP: 0018:ffff8880a7f97a08 EFLAGS: 00010206
RAX: ffffed1012a37e9c RBX: 00000000000074e0 RCX: 0000000000001fcb
RDX: 00000000000074e0 RSI: 0000000020e23000 RDI: ffff8880951bd515
RBP: ffff8880a7f97a40 R08: ffffed1012a37e9c R09: 0000000000000004
R10: ffffed1012a37e9b R11: ffff8880951bf4df R12: 0000000020e1daeb
R13: ffff8880951b8000 R14: 0000000020e24fcb R15: 00007ffffffff000
 _copy_from_iter_full+0x1f2/0x800 lib/iov_iter.c:724
 copy_from_iter_full include/linux/uio.h:124 [inline]
 skb_do_copy_data_nocache include/net/sock.h:1965 [inline]
 skb_copy_to_page_nocache include/net/sock.h:1991 [inline]
 tcp_sendmsg_locked+0x1364/0x3290 net/ipv4/tcp.c:1355
 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1454
 inet_sendmsg+0x141/0x5d0 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:632
 __sys_sendto+0x262/0x380 net/socket.c:1787
 __do_sys_sendto net/socket.c:1799 [inline]
 __se_sys_sendto net/socket.c:1795 [inline]
 __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1795
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x448799
Code: e8 8c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 fb 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6714a21da8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00000000006ddc48 RCX: 0000000000448799
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006
RBP: 00000000006ddc40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006ddc4c
R13: 00007fffb675867f R14: 00007f6714a229c0 R15: 00000000006ddc4c