rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10485 ticks this GP) idle=44a/1/0x4000000000000000 softirq=55206/55212 fqs=5178 
	(t=10500 jiffies g=93665 q=923)
NMI backtrace for cpu 1
CPU: 1 PID: 22773 Comm: syz-executor.1 Not tainted 5.10.0-rc4-next-20201123-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+0x107/0x163 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:165 [inline]
 rcu_dump_cpu_stacks+0x211/0x295 kernel/rcu/tree_stall.h:342
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:702 [inline]
 rcu_pending kernel/rcu/tree.c:3770 [inline]
 rcu_sched_clock_irq.cold+0x4d9/0x11be kernel/rcu/tree.c:2595
 update_process_times+0x16d/0x200 kernel/time/timer.c:1782
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:206
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1358
 __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:1085 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102
 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:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1b/0x60 kernel/kcov.c:197
Code: 24 08 48 8b 34 24 e9 a1 fd ff ff 0f 1f 40 00 65 48 8b 14 25 00 f0 01 00 65 8b 05 90 64 91 7e a9 00 01 ff 00 48 8b 34 24 74 0f <f6> c4 01 74 35 8b 82 b4 14 00 00 85 c0 74 2b 8b 82 90 14 00 00 83
RSP: 0018:ffffc90000d90908 EFLAGS: 00000206
RAX: 0000000000000303 RBX: dffffc0000000000 RCX: ffffffff81572ab0
RDX: ffff888024c58000 RSI: ffffffff88524195 RDI: ffffc90000d908a0
RBP: ffff888057985280 R08: 0000000000000001 R09: 0000000000000003
R10: fffff520001b2114 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff888057985280 R14: ffffc90000d90d48 R15: ffffc90000d90d68
 __skb_unlink include/linux/skbuff.h:2062 [inline]
 __skb_dequeue include/linux/skbuff.h:2082 [inline]
 ieee80211_rx_handlers+0x135/0xae50 net/mac80211/rx.c:3770
 ieee80211_invoke_rx_handlers net/mac80211/rx.c:3833 [inline]
 ieee80211_prepare_and_rx_handle+0x2414/0x61c0 net/mac80211/rx.c:4513
 __ieee80211_rx_handle_packet net/mac80211/rx.c:4574 [inline]
 ieee80211_rx_list+0x1121/0x2500 net/mac80211/rx.c:4754
 ieee80211_rx_napi+0xf7/0x3d0 net/mac80211/rx.c:4777
 ieee80211_rx include/net/mac80211.h:4507 [inline]
 ieee80211_tasklet_handler+0xd4/0x130 net/mac80211/main.c:235
 tasklet_action_common.constprop.0+0x1d7/0x2d0 kernel/softirq.c:558
 __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:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:radix_tree_iter_replace+0x40/0x60 lib/radix-tree.c:933
Code: fd 48 8d 7b 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 18 48 8b 73 18 4c 89 e9 4c 89 e2 48 89 ef 5b <5d> 41 5c 41 5d e9 b6 fc ff ff e8 11 0c e0 fd eb e1 0f 1f 44 00 00
RSP: 0018:ffffc90002207268 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc900022073a0 RCX: ffff88804f715ae0
RDX: ffff888065694b40 RSI: ffff888065694b00 RDI: ffff888010200810
RBP: ffff888010200810 R08: 0000000000000000 R09: ffff888065694d2f
R10: fffffffffffff000 R11: 0000000000000000 R12: ffff888065694b40
R13: ffff88804f715ae0 R14: 0000000000000000 R15: ffffc900022072d0
 idr_alloc_u32+0x1dc/0x2d0 lib/idr.c:52
 idr_alloc_cyclic+0x102/0x230 lib/idr.c:125
 __kernfs_new_node+0x117/0x8b0 fs/kernfs/dir.c:633
 kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:689
 __kernfs_create_file+0x51/0x350 fs/kernfs/file.c:1002
 sysfs_add_file_mode_ns+0x226/0x540 fs/sysfs/file.c:306
 create_files fs/sysfs/group.c:64 [inline]
 internal_create_group+0x328/0xb20 fs/sysfs/group.c:149
 add_port drivers/infiniband/core/sysfs.c:1134 [inline]
 ib_setup_port_attrs+0x94b/0x14f0 drivers/infiniband/core/sysfs.c:1395
 add_one_compat_dev+0x4ab/0x800 drivers/infiniband/core/device.c:949
 rdma_dev_init_net+0x2dc/0x480 drivers/infiniband/core/device.c:1165
 ops_init+0xaf/0x470 net/core/net_namespace.c:152
 setup_net+0x2de/0x850 net/core/net_namespace.c:342
 copy_net_ns+0x319/0x760 net/core/net_namespace.c:483
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x385/0x470 kernel/nsproxy.c:179
 copy_process+0x2a87/0x6fb0 kernel/fork.c:2100
 kernel_clone+0xe7/0xab0 kernel/fork.c:2462
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2579
 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:00007fd299e15c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000002040 RCX: 000000000045deb9
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 00000000e1004d7c
RBP: 000000000118bf70 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffe1b1c2f1f R14: 00007fd299e169c0 R15: 000000000118bf2c