rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=932/1/0x4000000000000002 softirq=28859/28859 fqs=5246 
	(t=10502 jiffies g=46529 q=2302)
NMI backtrace for cpu 1
CPU: 1 PID: 15390 Comm: syz-executor.3 Not tainted 5.7.0-rc6-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+0x188/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x19b/0x1e5 kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:549 [inline]
 rcu_pending kernel/rcu/tree.c:3225 [inline]
 rcu_sched_clock_irq.cold+0x55d/0xcfa kernel/rcu/tree.c:2296
 update_process_times+0x25/0x60 kernel/time/timer.c:1727
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1320
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x5ca/0xed0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:perf_output_read_group kernel/events/core.c:6689 [inline]
RIP: 0010:perf_output_read+0xb87/0x11f0 kernel/events/core.c:6729
Code: 4c 39 2c 24 74 40 e8 28 3b e7 ff 49 8d bd a8 00 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 74 08 3c 03 0f 8e 4c 05 00 00 <41> 8b 9d a8 00 00 00 bf 01 00 00 00 89 de e8 66 3c e7 ff 83 fb 01
RSP: 0018:ffffc90006217140 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000010 RCX: ffffc90010945000
RDX: 0000000000040000 RSI: ffffffff818bf9f8 RDI: ffff88808a8890a8
RBP: 0000000000000c28 R08: ffff88808a898380 R09: ffffed1013263a7d
R10: ffff88809931d3e7 R11: ffffed1013263a7c R12: dffffc0000000000
R13: ffff88808a889000 R14: ffffc90006217298 R15: ffffc90006217498
 perf_output_sample+0xe17/0x1c20 kernel/events/core.c:6776
 __perf_event_output kernel/events/core.c:7157 [inline]
 perf_event_output_forward+0x12f/0x270 kernel/events/core.c:7171
 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:8743
 perf_swevent_overflow+0xac/0x150 kernel/events/core.c:8819
 perf_swevent_event+0x1e9/0x2e0 kernel/events/core.c:8852
 do_perf_sw_event kernel/events/core.c:8960 [inline]
 ___perf_sw_event+0x31c/0x570 kernel/events/core.c:8991
 __perf_sw_event+0x4b/0xa0 kernel/events/core.c:9003
 perf_sw_event include/linux/perf_event.h:1158 [inline]
 do_user_addr_fault arch/x86/mm/fault.c:1501 [inline]
 do_page_fault+0xb07/0x13da arch/x86/mm/fault.c:1535
 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x30 arch/x86/lib/copy_user_64.S:205
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 f3 a4
RSP: 0018:ffffc90006217a58 EFLAGS: 00010206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000007fcb
RDX: 0000000000008000 RSI: 0000000020fd5000 RDI: ffff888052368035
RBP: ffff888052368000 R08: ffffed100a46e000 R09: 0000000000000000
R10: ffff88805236ffff R11: ffffed100a46dfff R12: 0000000020fd4fcb
R13: 0000000020fdcfcb R14: 00007ffffffff000 R15: 0000000000000000
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_from_user arch/x86/include/asm/uaccess_64.h:68 [inline]
 copyin+0x107/0x140 lib/iov_iter.c:151
 _copy_from_iter_full+0x20a/0x870 lib/iov_iter.c:789
 copy_from_iter_full include/linux/uio.h:156 [inline]
 skb_do_copy_data_nocache include/net/sock.h:2036 [inline]
 skb_copy_to_page_nocache include/net/sock.h:2062 [inline]
 tcp_sendmsg_locked+0x131a/0x3210 net/ipv4/tcp.c:1343
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1441
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:807
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 __sys_sendto+0x220/0x330 net/socket.c:2000
 __do_sys_sendto net/socket.c:2012 [inline]
 __se_sys_sendto net/socket.c:2008 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2008
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45ca29
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fad312e5c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00000000005011c0 RCX: 000000000045ca29
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0f0000000000e803
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a0e R14: 00000000004cce56 R15: 00007fad312e66d4