rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (7534 ticks this GP) idle=31a/1/0x4000000000000000 softirq=11431/11432 fqs=156 
	(t=10500 jiffies g=10009 q=2785)
NMI backtrace for cpu 0
CPU: 0 PID: 9855 Comm: syz-executor966 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+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:arch_local_irq_restore arch/x86/include/asm/irqflags.h:85 [inline]
RIP: 0010:lock_acquire kernel/locking/lockdep.c:5440 [inline]
RIP: 0010:lock_acquire+0x2c7/0x740 kernel/locking/lockdep.c:5402
Code: 48 c7 c7 40 5f 4b 89 48 83 c4 20 e8 93 65 8f 07 b8 ff ff ff ff 65 0f c1 05 36 d2 ab 7e 83 f8 01 0f 85 36 03 00 00 ff 34 24 9d <e9> 3a fe ff ff 65 ff 05 dd c0 ab 7e 48 8b 05 16 bf 82 0b e8 21 5a
RSP: 0018:ffffc90000007b88 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 1ffff92000000f73 RCX: 0000000000000001
RDX: 1ffff110065917b2 RSI: 0000000000000102 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8ebaf6df
R10: fffffbfff1d75edb R11: 0000000000000001 R12: 0000000000000000
R13: ffff8880331e39a0 R14: 0000000000000000 R15: 0000000000000000
 __raw_write_lock include/linux/rwlock_api_smp.h:210 [inline]
 _raw_write_lock+0x2a/0x40 kernel/locking/spinlock.c:295
 addrconf_rs_timer+0x3fa/0x820 net/ipv6/addrconf.c:3878
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410
 expire_timers kernel/time/timer.c:1455 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747
 __run_timers kernel/time/timer.c:1728 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760
 __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:rcu_read_unlock_special kernel/rcu/tree_plugin.h:641 [inline]
RIP: 0010:__rcu_read_unlock+0x1d3/0x470 kernel/rcu/tree_plugin.h:399
Code: ff a4 7e 81 e2 00 00 0f 00 0f 85 0b 02 00 00 4d 85 ed 74 62 84 c0 74 5e bf 09 00 00 00 e8 e5 7f e5 ff e8 f0 d2 18 00 41 54 9d <e9> a5 fe ff ff 0f 0b 5b 5d 41 5c 41 5d 41 5e c3 e8 d8 92 54 00 e9
RSP: 0018:ffffc9000a5ff510 EFLAGS: 00000246
RAX: 0000000000dfcb97 RBX: ffff8880b9e35740 RCX: ffffffff8155a937
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff8b33f980 R08: 0000000000000001 R09: ffffffff8ebaf67f
R10: fffffbfff1d75ecf R11: 0000000000000001 R12: 0000000000000246
R13: 0000000000000200 R14: 0000000000000001 R15: 0000000000000005
 rcu_read_unlock include/linux/rcupdate.h:694 [inline]
 do_perf_sw_event kernel/events/core.c:9087 [inline]
 ___perf_sw_event+0x365/0x570 kernel/events/core.c:9115
 __perf_sw_event+0x54/0x130 kernel/events/core.c:9127
 perf_sw_event include/linux/perf_event.h:1165 [inline]
 mm_account_fault mm/memory.c:4570 [inline]
 handle_mm_fault+0x10d3/0x55d0 mm/memory.c:4621
 do_user_addr_fault+0x55b/0xb40 arch/x86/mm/fault.c:1372
 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:ffffc9000a5ff9d0 EFLAGS: 00050246
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 00000000000009fa
RDX: 0000000000000000 RSI: 0000000020e57ffb RDI: ffff88801bc03030
RBP: ffff88801bc00000 R08: 0000000000000001 R09: ffff88801bc07fff
R10: ffffed1003780fff R11: 0000000000000000 R12: 0000000020e54fcb
R13: 0000000020e5cfcb 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: 0033:0x445469
Code: e8 3c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 1b 02 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc8efaaee8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000445469
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000009000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000048 R15: 0000000000000004