rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=2b2/1/0x4000000000000002 softirq=36090/36090 fqs=5224 
	(t=10500 jiffies g=40837 q=802)
NMI backtrace for cpu 0
CPU: 0 PID: 13840 Comm: syz-executor.4 Not tainted 5.5.0-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:77 [inline]
 dump_stack+0x1fb/0x318 lib/dump_stack.c:118
 nmi_cpu_backtrace+0xaa/0x190 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x16f/0x290 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq+0x1521/0x1ab0 kernel/rcu/tree.c:2271
 update_process_times+0x12d/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:171 [inline]
 tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1314
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x3f3/0x840 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x37c/0xda0 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:check_memory_region+0x222/0x2f0 mm/kasan/generic.c:192
Code: 03 4d 89 cf 49 8d 5e 07 4d 85 f6 49 0f 49 de 48 83 e3 f8 49 29 de 74 11 45 0f b6 1f 45 84 db 75 65 49 ff c7 49 ff ce 75 ef 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 45 84 db 75 50 45 8a 59 01 45 84 db
RSP: 0018:ffffc90002e9f220 EFLAGS: 00000256 ORIG_RAX: ffffffffffffff13
RAX: 1ffff920005d3e01 RBX: 0000000000000010 RCX: ffffffff818f5876
RDX: 0000000000000000 RSI: 0000000000000010 RDI: ffffc90002e9f2f0
RBP: ffffc90002e9f240 R08: dffffc0000000000 R09: fffff520005d3e60
R10: fffff520005d3e60 R11: 0000000000000000 R12: 1ffff920005d3e5e
R13: dffffc0000000001 R14: 0000000000000002 R15: ffff88809af59730
 memcpy+0x28/0x60 mm/kasan/common.c:125
 memcpy_common kernel/events/internal.h:174 [inline]
 __output_copy kernel/events/internal.h:178 [inline]
 perf_output_read_group kernel/events/core.c:6511 [inline]
 perf_output_read+0xf46/0x1210 kernel/events/core.c:6544
 perf_output_sample+0x2b5/0x1f10 kernel/events/core.c:6586
 __perf_event_output kernel/events/core.c:6946 [inline]
 perf_event_output_forward+0x10d/0x1c0 kernel/events/core.c:6960
 __perf_event_overflow+0x1c6/0x350 kernel/events/core.c:8427
 perf_swevent_event+0x30e/0x580 kernel/events/core.c:8503
 do_perf_sw_event kernel/events/core.c:8644 [inline]
 ___perf_sw_event+0x41f/0x560 kernel/events/core.c:8675
 __perf_sw_event+0x142/0x230 kernel/events/core.c:8687
 do_user_addr_fault+0x697/0xaf0 include/linux/perf_event.h:1138
 __do_page_fault+0xd3/0x1f0 arch/x86/mm/fault.c:1506
 do_page_fault+0x99/0xb0 arch/x86/mm/fault.c:1530
 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:ffffc90002e9f9e8 EFLAGS: 00010206
RAX: ffffffff83982001 RBX: 0000000020e1cfcb RCX: 0000000000006fcb
RDX: 0000000000008000 RSI: 0000000020e16000 RDI: ffff88804f919035
RBP: ffffc90002e9fa18 R08: dffffc0000000000 R09: ffffed1009f24000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000008000
R13: 00007ffffffff000 R14: 0000000020e14fcb R15: ffff88804f918000
 _copy_from_iter_full+0x1f9/0x860 lib/iov_iter.c:789
 copy_from_iter_full include/linux/uio.h:156 [inline]
 skb_do_copy_data_nocache+0xf5/0x2e0 include/net/sock.h:1992
 skb_copy_to_page_nocache include/net/sock.h:2018 [inline]
 tcp_sendmsg_locked+0x17b1/0x3eb0 net/ipv4/tcp.c:1336
 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1434
 inet_sendmsg+0x147/0x310 net/ipv4/af_inet.c:807
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg net/socket.c:659 [inline]
 __sys_sendto+0x43c/0x5e0 net/socket.c:1985
 __do_sys_sendto net/socket.c:1997 [inline]
 __se_sys_sendto net/socket.c:1993 [inline]
 __x64_sys_sendto+0xe5/0x100 net/socket.c:1993
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b349
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5d2d6fcc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f5d2d6fd6d4 RCX: 000000000045b349
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007
R13: 00000000000009a8 R14: 00000000004cb1dc R15: 0000000000000000