rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=472/1/0x4000000000000000 softirq=28659/28660 fqs=5240 
	(t=10502 jiffies g=41425 q=2671)
NMI backtrace for cpu 1
CPU: 1 PID: 16679 Comm: syz-executor.2 Not tainted 5.10.0-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+0x137/0x1be lib/dump_stack.c:118
 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x199/0x2b0 kernel/rcu/tree_stall.h:331
 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:637 [inline]
 rcu_pending kernel/rcu/tree.c:3694 [inline]
 rcu_sched_clock_irq+0x1852/0x2280 kernel/rcu/tree.c:2567
 update_process_times+0x197/0x200 kernel/time/timer.c:1709
 tick_sched_handle kernel/time/tick-sched.c:176 [inline]
 tick_sched_timer+0x25e/0x410 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x43d/0x960 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x3b3/0xe00 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1097
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:234 [inline]
RIP: 0010:pvclock_clocksource_read+0x91/0x6b0 arch/x86/kernel/pvclock.c:76
Code: 89 44 24 38 48 89 54 24 48 43 0f b6 04 33 84 c0 0f 85 35 01 00 00 42 0f b6 04 32 84 c0 0f 85 80 01 00 00 45 8b 65 00 0f 01 f9 <66> 90 48 89 c3 48 89 d5 48 c1 e5 20 48 8b 44 24 60 42 0f b6 04 30
RSP: 0018:ffffc90001b0f258 EFLAGS: 00000246
RAX: 000000007c269b9e RBX: ffffffff8bd66528 RCX: 0000000000000001
RDX: 00000000000000fe RSI: ffffffff8e93c05c RDI: ffffffff8e93c05d
RBP: ffffc90001b0f460 R08: ffffffff8e93c048 R09: ffffffff8e93c058
R10: ffffffff8e93c043 R11: 1ffffffff1d27808 R12: 0000000000000006
R13: ffffffff8e93c040 R14: dffffc0000000000 R15: ffffffff8e93c050
 kvm_clock_read arch/x86/kernel/kvmclock.c:90 [inline]
 kvm_sched_clock_read+0x15/0x40 arch/x86/kernel/kvmclock.c:102
 paravirt_sched_clock arch/x86/include/asm/paravirt.h:22 [inline]
 sched_clock+0x36/0x40 arch/x86/kernel/tsc.c:252
 sched_clock_cpu+0x18/0x3c0 kernel/sched/clock.c:371
 local_clock include/linux/sched/clock.h:84 [inline]
 cpu_clock_event_update kernel/events/core.c:10344 [inline]
 cpu_clock_event_read+0x17/0x50 kernel/events/core.c:10377
 perf_output_read_group kernel/events/core.c:6730 [inline]
 perf_output_read+0xd73/0x11e0 kernel/events/core.c:6769
 perf_output_sample+0x2bb/0x2100 kernel/events/core.c:6816
 __perf_event_output kernel/events/core.c:7197 [inline]
 perf_event_output_forward+0x10e/0x1c0 kernel/events/core.c:7211
 __perf_event_overflow+0x1b9/0x340 kernel/events/core.c:8867
 do_perf_sw_event kernel/events/core.c:9084 [inline]
 ___perf_sw_event+0x43f/0x590 kernel/events/core.c:9115
 __perf_sw_event+0x13f/0x270 kernel/events/core.c:9127
 mm_account_fault include/linux/perf_event.h:1165 [inline]
 handle_mm_fault+0x21ba/0x25a0 mm/memory.c:4621
 do_user_addr_fault+0x4ca/0xa40 arch/x86/mm/fault.c:1372
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0xa1/0x1e0 arch/x86/mm/fault.c:1485
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:583
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:ffffc90001b0fac8 EFLAGS: 00010206
RAX: ffffffff83bfa301 RBX: ffffc90001b0fdd8 RCX: 0000000000005fcb
RDX: 0000000000008000 RSI: 0000000020fa7000 RDI: ffff88807809a035
RBP: ffff888078098000 R08: dffffc0000000000 R09: ffffed100f014000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000008000
R13: 0000000020fa4fcb R14: 0000000020facfcb 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 lib/iov_iter.c:159 [inline]
 _copy_from_iter_full+0x2a9/0xa60 lib/iov_iter.c:795
 copy_from_iter_full include/linux/uio.h:155 [inline]
 skb_do_copy_data_nocache+0xf6/0x2f0 include/net/sock.h:2036
 skb_copy_to_page_nocache include/net/sock.h:2062 [inline]
 tcp_sendmsg_locked+0x1893/0x3fa0 net/ipv4/tcp.c:1347
 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1444
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 __sys_sendto+0x42a/0x5c0 net/socket.c:1992
 __do_sys_sendto net/socket.c:2004 [inline]
 __se_sys_sendto net/socket.c:2000 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2000
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45deb9
Code: 0d b4 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4a9dfa7c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000002e940 RCX: 000000000045deb9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000003
RBP: 000000000118bf78 R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffca4a4035f R14: 00007f4a9dfa89c0 R15: 000000000118bf2c