rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10197 ticks this GP) idle=8de/1/0x4000000000000000 softirq=30483/30486 fqs=5141 
	(t=10500 jiffies g=45117 q=73)
NMI backtrace for cpu 0
CPU: 0 PID: 19707 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+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 fa 3a 6e f8 48 89 ef e8 82 ef 6e f8 f6 c7 02 75 1a 53 9d <bf> 01 00 00 00 e8 91 5b 63 f8 65 8b 05 9a 05 1a 77 85 c0 74 0a 5b
RSP: 0018:ffffc90000007eb0 EFLAGS: 00000246
RAX: 0000000002bdf206 RBX: 0000000000000246 RCX: ffffffff8155a937
RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000000
RBP: ffff8880180c9408 R08: 0000000000000001 R09: ffffffff8ebaf67f
R10: fffffbfff1d75ecf R11: 0000000000000001 R12: ffff8880131a7280
R13: ffff8880180c9408 R14: ffff8880131a7c80 R15: 0000000000000001
 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
 skb_dequeue+0x125/0x180 net/core/skbuff.c:3036
 ieee80211_tasklet_handler+0x37/0x130 net/mac80211/main.c:228
 tasklet_action_common.constprop.0+0x22f/0x2d0 kernel/softirq.c:560
 __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:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:4789
Code: 55 53 65 48 8b 1c 25 00 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 82 4c 64 f8 e8 4d b2 8e f8 fb bf 01 00 00 00 <e8> 82 d1 ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 f0 34 64
RSP: 0018:ffffc9001663f668 EFLAGS: 00000202
RAX: 0000000001b3c7df RBX: ffff888069f9b480 RCX: ffffffff8155a937
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed100d3f3690 R08: 0000000000000001 R09: ffffffff8ebaf67f
R10: fffffbfff1d75ecf R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 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:linear_page_index include/linux/pagemap.h:558 [inline]
RIP: 0010:__handle_mm_fault mm/memory.c:4430 [inline]
RIP: 0010:handle_mm_fault+0x332/0x55d0 mm/memory.c:4607
Code: 89 9c 24 84 00 00 00 80 3c 02 00 0f 85 58 34 00 00 48 8b 5c 24 08 49 8d be 98 00 00 00 48 b8 00 00 00 00 00 fc ff df 49 2b 1e <48> 89 fa 48 c1 ea 03 48 c1 eb 0c 80 3c 02 00 0f 85 20 34 00 00 48
RSP: 0018:ffffc9001663f738 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 0000000000f6e000 RCX: ffffc9000d885000
RDX: 1ffff1100301b96b RSI: ffffffff81a21cf7 RDI: ffff8880180dcbf0
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8cec9627
R10: 0000000000000000 R11: 1ffffffff1667f48 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880180dcb58 R15: ffff8880180dcba8
 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:ffffc9001663f9d0 EFLAGS: 00050246
RAX: 0000000000000001 RBX: 0000000000008000 RCX: 0000000000000dfa
RDX: 0000000000000000 RSI: 0000000020f6dffb RDI: ffff888014b39030
RBP: ffff888014b38000 R08: 0000000000000001 R09: ffff888014b3ffff
R10: ffffed1002967fff R11: 0000000000000000 R12: 0000000020f6cfcb
R13: 0000000020f74fcb 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: 0033:0x45de79
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:00007f296dcf6c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000045de79
RDX: ffffffffffffffef RSI: 0000000020d7cfcb RDI: 0000000000000005
RBP: 000000000118bf78 R08: 0000000000000000 R09: 0000000000000053
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007fffe4e2c3ff R14: 00007f296dcf79c0 R15: 000000000118bf2c