rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 2640 jiffies s: 196537 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 394 Comm: syz.4.9028 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:check_preemption_disabled+0x18/0x110 lib/smp_processor_id.c:14
Code: cc cc 48 c7 c7 00 1b df 8a 48 c7 c6 40 1b df 8a eb 00 55 41 57 41 56 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 <65> 8b 05 01 6f d3 75 65 8b 0d a2 c4 d3 75 f7 c1 ff ff ff 7f 74 1f
RSP: 0000:ffffc900001e08d0 EFLAGS: 00000082
RAX: 0539d4cf148af600 RBX: ffff8880b8f35800 RCX: ffffffff8a2ea102
RDX: 0000000000000000 RSI: ffffffff8a94e700 RDI: ffffffff8adf1b60
RBP: ffffc900001e09c8 R08: ffff8880b8f3580b R09: 1ffff110171e6b01
R10: dffffc0000000000 R11: ffffed10171e6b02 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff8880b8f00000 R15: 0000000000000000
FS:  00007fd01f09d6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fea776cfff8 CR3: 000000007c5d1000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ct_dynticks_nmi_nesting include/linux/context_tracking_state.h:92 [inline]
 ct_nmi_exit+0x145/0x1c0 kernel/context_tracking.c:224
 ct_irq_exit_irqson+0xaf/0x170 kernel/context_tracking.c:422
 trace_irq_enable_rcuidle+0xd8/0x140 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 82 22 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0000:ffffc900001e0ac0 EFLAGS: 00000206
RAX: 0539d4cf148af600 RBX: 1ffff9200003c160 RCX: 0539d4cf148af600
RDX: dffffc0000000000 RSI: ffffffff8a8c19a0 RDI: ffffffff8adf1b60
RBP: ffffc900001e0bb0 R08: ffffffff90afd24f R09: 1ffffffff215fa49
R10: dffffc0000000000 R11: fffffbfff215fa4a R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3b900 R15: 0000000000000002
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
 mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
 __run_hrtimer kernel/time/hrtimer.c:1747 [inline]
 __hrtimer_run_queues+0x54a/0xd50 kernel/time/hrtimer.c:1811
 hrtimer_run_softirq+0x183/0x2a0 kernel/time/hrtimer.c:1828
 handle_softirqs+0x2a1/0x930 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:212
Code: 2e 0f 1f 84 00 00 00 00 00 90 53 48 89 fb e8 17 00 00 00 48 8b 3d b0 87 9d 0c 48 89 de 5b e9 b7 42 50 00 00 00 cc cc 00 00 cc <48> 8b 04 24 65 48 8b 0d 84 e8 7f 7e 65 8b 15 85 e8 7f 7e 81 e2 00
RSP: 0000:ffffc90005cceda0 EFLAGS: 00000246
RAX: 1ffff1100b37b660 RBX: ffffffff8b97df80 RCX: 0000000000080000
RDX: ffffc9001ef64000 RSI: 000000000003000b RDI: 000000000003000c
RBP: ffff888059bdb2f0 R08: 0000000000000000 R09: 000000008b97d900
R10: dffffc0000000000 R11: ffffed100b37b67d R12: 0000000000000009
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888059bdb300
 insert_entry fs/proc/proc_sysctl.c:159 [inline]
 insert_header+0xa2d/0xdb0 fs/proc/proc_sysctl.c:252
 __register_sysctl_table+0xd84/0xe70 fs/proc/proc_sysctl.c:1385
 __addrconf_sysctl_register+0x271/0x3e0 net/ipv6/addrconf.c:7150
 addrconf_sysctl_register+0x15c/0x1b0 net/ipv6/addrconf.c:7197
 ipv6_add_dev+0xbe0/0x1120 net/ipv6/addrconf.c:451
 addrconf_notify+0x634/0xf40 net/ipv6/addrconf.c:3595
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline]
 call_netdevice_notifiers net/core/dev.c:2066 [inline]
 register_netdevice+0x163f/0x1b10 net/core/dev.c:10276
 internal_dev_create+0x3bf/0x570 net/openvswitch/vport-internal_dev.c:159
 ovs_vport_add+0x105/0x360 net/openvswitch/vport.c:203
 new_vport+0x1a/0x190 net/openvswitch/datapath.c:202
 ovs_dp_cmd_new+0x741/0xba0 net/openvswitch/datapath.c:1818
 genl_family_rcv_msg_doit+0x22a/0x330 net/netlink/genetlink.c:756
 genl_family_rcv_msg net/netlink/genetlink.c:833 [inline]
 genl_rcv_msg+0x604/0x790 net/netlink/genetlink.c:850
 netlink_rcv_skb+0x1fb/0x450 net/netlink/af_netlink.c:2511
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x74d/0x8d0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1872
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5be/0x970 net/socket.c:2518
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2572
 __sys_sendmsg net/socket.c:2601 [inline]
 __do_sys_sendmsg net/socket.c:2610 [inline]
 __se_sys_sendmsg+0x1bb/0x2a0 net/socket.c:2608
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd01e19ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd01f09d028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd01e416090 RCX: 00007fd01e19ce59
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000016
RBP: 00007fd01e232d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd01e416128 R14: 00007fd01e416090 R15: 00007ffe8fcc0338
 </TASK>