rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2666 jiffies s: 31185 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5522 Comm: kworker/u4:16 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: netns cleanup_net
RIP: 0010:raw_irqentry_exit_cond_resched+0x7/0x30 kernel/entry/common.c:390
Code: 41 94 7e c1 c1 1b 0f 31 31 c8 65 89 05 62 41 94 7e e9 07 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 65 8b 05 91 96 94 7e <a9> ff ff ff 7f 75 1a e8 2d 35 fd ff 65 48 8b 05 75 96 94 7e 48 f7
RSP: 0018:ffffc90000007b68 EFLAGS: 00000046
RAX: 0000000000000100 RBX: 0000000000000000 RCX: cf7c4517447b6800
RDX: 1ffffffff1f3ee00 RSI: 0000000000000000 RDI: ffffc90000007b78
RBP: 0000000000000000 R08: ffffffff8f9f7008 R09: ffffffff8f9f7018
R10: ffffffff8f9f7010 R11: ffffffff8f9f7003 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f93b8df9d58 CR3: 000000007e785000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x84/0x500 kernel/rcu/tree_plugin.h:685
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 0d 93 96 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc90000007c20 EFLAGS: 00000206
RAX: cf7c4517447b6800 RBX: 1ffff92000000f8c RCX: cf7c4517447b6800
RDX: dffffc0000000000 RSI: ffffffff8a8c0580 RDI: ffffffff8adef3a0
RBP: ffffc90000007d08 R08: dffffc0000000000 R09: fffffbfff215c44a
R10: fffffbfff215c44a R11: 1ffffffff215c449 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8e3b900 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
 rcu_read_unlock include/linux/rcupdate.h:823 [inline]
 rebalance_domains+0x89c/0x9d0 kernel/sched/fair.c:11044
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x12f/0x220 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:should_resched arch/x86/include/asm/preempt.h:103 [inline]
RIP: 0010:__local_bh_enable_ip+0x132/0x1b0 kernel/softirq.c:428
Code: 8a e8 d2 65 c9 08 65 66 8b 05 4a 2e b5 7e 66 85 c0 75 54 bf 01 00 00 00 e8 bb 45 09 00 e8 16 bd 38 00 fb 65 8b 05 36 fd b3 7e <85> c0 75 05 e8 85 0e b2 ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc90003587a80 EFLAGS: 00000282
RAX: 0000000080000000 RBX: 0000000000000201 RCX: cf7c4517447b6800
RDX: dffffc0000000000 RSI: ffffffff8a8c0580 RDI: ffffffff8adef3a0
RBP: ffffc90003587b08 R08: dffffc0000000000 R09: fffffbfff215c44a
R10: fffffbfff215c44a R11: 1ffffffff215c449 R12: ffffffff88ae20d0
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920006b0f50
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 tcp_metrics_flush_all+0x280/0x330 net/ipv4/tcp_metrics.c:917
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x77b/0xb80 net/core/net_namespace.c:640
 process_one_work+0x898/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>