rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=259c/1/0x4000000000000000 softirq=79770/79770 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=63541, q=469 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12469 Comm: kworker/u8:23 Not tainted 6.15.0-rc6-syzkaller-00052-g9f35e33144ae #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
RIP: 0010:__sanitizer_cov_trace_pc+0x66/0x70 kernel/kcov.c:235
Code: 82 18 16 00 00 83 f8 02 75 20 48 8b 8a 20 16 00 00 8b 92 1c 16 00 00 48 8b 01 48 83 c0 01 48 39 d0 73 07 48 89 01 48 89 34 c1 <c3> cc cc cc cc 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000a08e20 EFLAGS: 00000046
RAX: 0000000080010202 RBX: ffff88802b6c7340 RCX: 0000000000000000
RDX: ffff888028d9c880 RSI: ffffffff81a854ea RDI: ffff88802b6c7340
RBP: 0000000000000001 R08: 0000000000000000 R09: fffffbfff35a1d32
R10: ffffffff9ad0e993 R11: 0000000000000000 R12: ffff8880b8527840
R13: 184cf5f17b3d7ada R14: ffff88802b6c7340 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888124adf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34019ff8 CR3: 0000000050fe6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 arch_static_branch arch/x86/include/asm/jump_label.h:36 [inline]
 trace_hrtimer_cancel+0xa/0x200 include/trace/events/timer.h:317
 debug_deactivate kernel/time/hrtimer.c:491 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1729 [inline]
 __hrtimer_run_queues+0x477/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x3f0 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x62/0x350 kernel/locking/lockdep.c:5870
Code: e9 0b 12 83 f8 07 0f 87 bc 02 00 00 89 c0 48 0f a3 05 02 d8 ec 0e 0f 82 74 02 00 00 8b 35 9a 07 ed 0e 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 d9 e8 0b 12 0f 85 c7 02 00 00 48 83 c4
RSP: 0018:ffffc90003bdf5c8 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffff888063498908 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8dbbd24b RDI: ffffffff8bf48920
RBP: 0000000000000000 R08: 08ff86960d90ef62 R09: ffffffff96a159a0
R10: 0000000000000008 R11: 0000000000002bb0 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
 _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178
 spin_lock_bh include/linux/spinlock.h:356 [inline]
 dev_reset_queue+0xa9/0x1d0 net/sched/sch_generic.c:1309
 netdev_for_each_tx_queue include/linux/netdevice.h:2650 [inline]
 dev_deactivate_many+0x4e5/0xd50 net/sched/sch_generic.c:1375
 __dev_close_many+0x150/0x770 net/core/dev.c:1686
 dev_close_many+0x233/0x630 net/core/dev.c:1727
 unregister_netdevice_many_notify+0x578/0x26f0 net/core/dev.c:11940
 unregister_netdevice_many net/core/dev.c:12034 [inline]
 default_device_exit_batch+0x853/0xaf0 net/core/dev.c:12528
 ops_exit_list+0x128/0x180 net/core/net_namespace.c:177
 cleanup_net+0x5c1/0xb30 net/core/net_namespace.c:654
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g63541 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=26489
rcu: rcu_preempt kthread starved for 10502 jiffies! g63541 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:27704 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2248
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>