rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10241 ticks this GP) idle=0d6/1/0x4000000000000000 softirq=25079/25081 fqs=5199 
	(t=10500 jiffies g=33593 q=1014)
NMI backtrace for cpu 0
CPU: 0 PID: 15554 Comm: syz-executor.5 Not tainted 5.10.0-rc5-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+0x107/0x163 lib/dump_stack.c:118
 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+0x1e3/0x21e 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.cold+0x472/0xee8 kernel/rcu/tree.c:2567
 update_process_times+0x77/0xd0 kernel/time/timer.c:1709
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191
Code: f8 5d c3 66 90 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 2a 5b 6e f8 48 89 ef e8 b2 0f 6f f8 f6 c7 02 75 1a 53 9d <bf> 01 00 00 00 e8 b1 7b 63 f8 65 8b 05 ba 25 1a 77 85 c0 74 0a 5b
RSP: 0018:ffffc90000007e10 EFLAGS: 00000286
RAX: 00000000011c6caa RBX: 0000000000000286 RCX: ffffffff8155a947
RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000000
RBP: ffff8880b9e26900 R08: 0000000000000001 R09: ffffffff8ebad70f
R10: fffffbfff1d75ae1 R11: 0000000000000001 R12: ffff8880b9e26900
R13: ffff8880b9e26b80 R14: ffffffff850f2a90 R15: dffffc0000000000
 __run_hrtimer kernel/time/hrtimer.c:1515 [inline]
 __hrtimer_run_queues+0x5c0/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1600
 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x132/0x200 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:lock_is_held_type+0xc2/0x100 kernel/locking/lockdep.c:5481
Code: 03 44 39 f0 41 0f 94 c4 48 c7 c7 40 5f 4b 89 e8 d4 0b 00 00 b8 ff ff ff ff 65 0f c1 05 07 99 1c 77 83 f8 01 75 23 ff 34 24 9d <48> 83 c4 08 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 45 31 e4 eb
RSP: 0018:ffffc90002def6a0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 1ffffffff19d9b2b
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff8b337820 R08: 0000000000000001 R09: ffffffff8ebad70f
R10: fffffbfff1d75ae1 R11: 0000000000000001 R12: 0000000000000000
R13: ffff88801addd7d8 R14: 00000000ffffffff R15: ffff88801addd7d8
 lock_is_held include/linux/lockdep.h:271 [inline]
 schedule_debug kernel/sched/core.c:4298 [inline]
 __schedule+0x13b3/0x2130 kernel/sched/core.c:4423
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:4789
 irqentry_exit_cond_resched kernel/entry/common.c:357 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:349 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x0/0x20 kernel/kcov.c:291
Code: 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 ae fe ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 <48> 8b 0c 24 48 89 f2 48 89 fe bf 07 00 00 00 e9 8c fe ff ff 66 90
RSP: 0018:ffffc90002def880 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880122ae540 RCX: ffffc90013e7e000
RDX: 0000000000040000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002def928 R08: 0000000000000001 R09: ffffffff8ebad70f
R10: fffffbfff1d75ae1 R11: 0000000000000000 R12: 0000000020e90000
R13: 0000000000000000 R14: 0000000000000200 R15: 0000000000000000
 do_user_addr_fault+0x1e1/0xb40 arch/x86/mm/fault.c:1278
 handle_page_fault arch/x86/mm/fault.c:1429 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1485
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:583
RIP: 0010:copy_user_generic_string+0x2c/0x40 arch/x86/lib/copy_user_64.S:169
Code: cb 83 fa 08 72 27 89 f9 83 e1 07 74 15 83 e9 08 f7 d9 29 ca 8a 06 88 07 48 ff c6 48 ff c7 ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 0f 1f 80 00 00 00 00 0f 01
RSP: 0018:ffffc90002def9d0 EFLAGS: 00050246
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 00000000000009fa
RDX: 0000000000000000 RSI: 0000000020e8fffb RDI: ffff888072cc3030
RBP: ffff888072cc0000 R08: 0000000000000001 R09: ffff888072cc7fff
R10: ffffed100e598fff R11: 0000000000000000 R12: 0000000020e8cfcb
R13: 0000000020e94fcb R14: 0000000000000000 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:52 [inline]
 copyin.part.0+0xe4/0x110 lib/iov_iter.c:159
 copyin lib/iov_iter.c:795 [inline]
 _copy_from_iter_full+0x22f/0x920 lib/iov_iter.c:795
 copy_from_iter_full include/linux/uio.h:155 [inline]
 skb_do_copy_data_nocache+0x145/0x2c0 include/net/sock.h:2036
 skb_copy_to_page_nocache include/net/sock.h:2062 [inline]
 tcp_sendmsg_locked+0x12ea/0x2d20 net/ipv4/tcp.c:1347
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1444
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:817
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:671
 __sys_sendto+0x21c/0x320 net/socket.c:1992
 __do_sys_sendto net/socket.c:2004 [inline]
 __se_sys_sendto net/socket.c:2000 [inline]
 __x64_sys_sendto+0xdd/0x1b0 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:00007fa9aad8ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000002e940 RCX: 000000000045deb9
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000005
RBP: 000000000118bf78 R08: 0000000000000000 R09: 0000000009000003
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffea37b19bf R14: 00007fa9aad8b9c0 R15: 000000000118bf2c