rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=7f2/1/0x4000000000000000 softirq=19880/19881 fqs=5089 
	(t=10500 jiffies g=26177 q=2287)
NMI backtrace for cpu 1
CPU: 1 PID: 12849 Comm: syz-executor.2 Not tainted 5.12.0-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:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 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/0x3e0 kernel/rcu/tree_stall.h:341
 print_cpu_stall kernel/rcu/tree_stall.h:624 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:699 [inline]
 rcu_pending kernel/rcu/tree.c:3911 [inline]
 rcu_sched_clock_irq.cold+0x3f1/0x74b kernel/rcu/tree.c:2649
 update_process_times+0x16d/0x200 kernel/time/timer.c:1796
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1373
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 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+0x146/0x540 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:632
RIP: 0010:arch_atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline]
RIP: 0010:atomic64_read include/asm-generic/atomic-instrumented.h:838 [inline]
RIP: 0010:perf_event_count kernel/events/core.c:4387 [inline]
RIP: 0010:perf_output_read_group kernel/events/core.c:6887 [inline]
RIP: 0010:perf_output_read+0xc66/0x1310 kernel/events/core.c:6924
Code: 44 24 10 be 08 00 00 00 4c 8d a0 b8 00 00 00 48 8b a8 b0 00 00 00 4c 89 e7 e8 56 4b 27 00 4c 89 e0 48 c1 e8 03 42 80 3c 28 00 <0f> 85 21 04 00 00 4c 8b 7c 24 10 31 ff 4c 8b 74 24 40 49 8b 87 b8
RSP: 0018:ffffc900184ef058 EFLAGS: 00000246
RAX: 1ffff11003e6a43f RBX: ffffc900184ef3a0 RCX: ffffffff818fa22a
RDX: ffffed1003e6a440 RSI: 0000000000000008 RDI: ffff88801f3521f8
RBP: 00000000000001ce R08: 0000000000000000 R09: ffff88801f3521ff
R10: ffffed1003e6a43f R11: 0000000000000001 R12: ffff88801f3521f8
R13: dffffc0000000000 R14: ffff88801f352140 R15: 0000000000000010
 perf_output_sample+0xd12/0x1be0 kernel/events/core.c:6971
 __perf_event_output kernel/events/core.c:7456 [inline]
 perf_event_output_forward+0x132/0x270 kernel/events/core.c:7470
 __perf_event_overflow+0x13c/0x3d0 kernel/events/core.c:9145
 perf_swevent_overflow kernel/events/core.c:9221 [inline]
 perf_swevent_event+0x347/0x550 kernel/events/core.c:9249
 do_perf_sw_event kernel/events/core.c:9362 [inline]
 ___perf_sw_event+0x31a/0x570 kernel/events/core.c:9393
 __perf_sw_event+0x54/0x130 kernel/events/core.c:9405
 perf_sw_event include/linux/perf_event.h:1172 [inline]
 mm_account_fault mm/memory.c:4514 [inline]
 handle_mm_fault+0x5da/0x7e0 mm/memory.c:4565
 do_user_addr_fault+0x483/0x1210 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:577
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:ffffc900184ef8f8 EFLAGS: 00010206
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000000fcb
RDX: 0000000000008000 RSI: 0000000020fcc000 RDI: ffff8880633ef035
RBP: ffff8880633e8000 R08: 0000000000000001 R09: ffff8880633effff
R10: ffffed100c67dfff R11: 0000000000000000 R12: 0000000020fc4fcb
R13: 0000000020fccfcb R14: 0000000000000000 R15: 0000000000008000
 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:200
 copyin lib/iov_iter.c:840 [inline]
 _copy_from_iter_full+0x299/0x11b0 lib/iov_iter.c:840
 copy_from_iter_full include/linux/uio.h:163 [inline]
 skb_do_copy_data_nocache+0x145/0x2c0 include/net/sock.h:2071
 skb_copy_to_page_nocache include/net/sock.h:2097 [inline]
 tcp_sendmsg_locked+0x1360/0x2e40 net/ipv4/tcp.c:1360
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:674
 __sys_sendto+0x21c/0x320 net/socket.c:1977
 __do_sys_sendto net/socket.c:1989 [inline]
 __se_sys_sendto net/socket.c:1985 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1985
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 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:00007fdbfa0e2188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000008
RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffed0bb036f R14: 00007fdbfa0e2300 R15: 0000000000022000