rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=813/1/0x4000000000000000 softirq=41560/41564 fqs=4777 
	(t=10500 jiffies g=62465 q=2613)
NMI backtrace for cpu 0
CPU: 0 PID: 15960 Comm: syz.7.2442 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x22d/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31f/0x5f0 kernel/rcu/tree_stall.h:633
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x6ec/0x1120 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:2021
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4b0/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x397/0x8b0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:kcov_remote_start+0x15c/0x5e0 kernel/kcov.c:909
Code: 23 06 00 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 0f 85 fd 02 00 00 41 f7 c4 00 02 00 00 74 05 fb eb 02 0f 0b <48> 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 44 00 00 4d 8b
RSP: 0018:ffffc90000007998 EFLAGS: 00000206
RAX: 6adb50cbfd1cb400 RBX: ffff888065251dc0 RCX: 6adb50cbfd1cb400
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4b80
RBP: ffffc90000007bf0 R08: ffffffff902140cf R09: 1ffffffff2042819
R10: dffffc0000000000 R11: fffffbfff204281a R12: 0000000000000246
R13: ffff888033851a00 R14: 0000000000000000 R15: ffff88806705b3b0
 kcov_remote_start_common include/linux/kcov.h:50 [inline]
 ieee80211_rx_list+0x5e4/0x25e0 net/mac80211/rx.c:4979
 ieee80211_rx_napi+0x17f/0x390 net/mac80211/rx.c:5020
 ieee80211_rx include/net/mac80211.h:4573 [inline]
 ieee80211_handle_queued_frames+0x104/0x1a0 net/mac80211/main.c:237
 tasklet_action_common+0x2ad/0x410 kernel/softirq.c:806
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:preempt_schedule_irq+0xb6/0x160 kernel/sched/core.c:6799
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 7f bf 01 00 00 00 e8 75 f4 87 f7 e8 f0 eb b4 f7 fb bf 01 00 00 00 <e8> d5 b5 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc9000303f500 EFLAGS: 00000286
RAX: 6adb50cbfd1cb400 RBX: 0000000000000000 RCX: 6adb50cbfd1cb400
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000000001
RBP: ffffc9000303f5b0 R08: ffffffff902140cf R09: 1ffffffff2042819
R10: dffffc0000000000 R11: fffffbfff204281a R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000607ea0
 irqentry_exit+0x63/0x70 kernel/entry/common.c:435
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_is_held_type+0x13a/0x190 kernel/locking/lockdep.c:5813
Code: 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 46 41 f7 c5 00 02 00 00 74 01 fb 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 75 3c 89 e8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9000303f678 EFLAGS: 00000206
RAX: 6adb50cbfd1cb400 RBX: ffff888065251dc0 RCX: 6adb50cbfd1cb400
RDX: 0000000000000000 RSI: ffffffff8a2b3e80 RDI: ffffffff8a7a4b80
RBP: 0000000000000000 R08: ffffffff8d8b2bef R09: 1ffffffff1b1657d
R10: dffffc0000000000 R11: fffffbfff1b1657e R12: 0000000000000001
R13: 0000000000000246 R14: ffffffff8c31f000 R15: ffff8880652528d8
 lock_is_held include/linux/lockdep.h:292 [inline]
 ___might_sleep+0x9b/0x610 kernel/sched/core.c:9624
 cond_resched_rcu+0x9d/0x130 include/linux/sched.h:2088
 ip_vs_conn_flush net/netfilter/ipvs/ip_vs_conn.c:1379 [inline]
 ip_vs_conn_net_cleanup+0x37b/0x540 net/netfilter/ipvs/ip_vs_conn.c:1461
 __ip_vs_cleanup_batch+0x6f/0xf0 net/netfilter/ipvs/ip_vs_core.c:2470
 ops_exit_list net/core/net_namespace.c:177 [inline]
 setup_net+0x842/0xa10 net/core/net_namespace.c:365
 copy_net_ns+0x33e/0x5b0 net/core/net_namespace.c:503
 create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110
 copy_namespaces+0x378/0x3d0 kernel/nsproxy.c:178
 copy_process+0x17f0/0x3e70 kernel/fork.c:2295
 kernel_clone+0x23f/0x990 kernel/fork.c:2682
 __do_sys_clone kernel/fork.c:2799 [inline]
 __se_sys_clone kernel/fork.c:2783 [inline]
 __x64_sys_clone+0x19a/0x210 kernel/fork.c:2783
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc1be45c199
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:00007fc1bc671fd8 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007fc1be6e4180 RCX: 00007fc1be45c199
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000c0126080
RBP: 00007fc1be4f38e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fc1be6e4218 R14: 00007fc1be6e4180 R15: 00007ffed618ca68
 </TASK>