INFO: rcu detected stall in ip

Kernel	Title	Rank 🛈	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in ip_expire (2) net	1	1	1792d	1792d	0/29	auto-closed as invalid on 2021/04/09 11:48
linux-6.1	INFO: rcu detected stall in ip_expire	1	1	441d	441d	0/3	auto-obsoleted due to no activity on 2024/12/30 13:44
linux-5.15	INFO: rcu detected stall in ip_expire	1	1	8d14h	8d14h	0/3	upstream: reported on 2025/11/28 05:26

rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=c36/1/0x4000000000000000 softirq=312931/312932 fqs=5236 (t=10501 jiffies g=580645 q=150106) NMI backtrace for cpu 0 CPU: 0 PID: 10589 Comm: syz-executor.4 Not tainted 5.9.0-rc1-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:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:318 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline] check_cpu_stall kernel/rcu/tree_stall.h:625 [inline] rcu_pending kernel/rcu/tree.c:3637 [inline] rcu_sched_clock_irq.cold+0x5b3/0xccd kernel/rcu/tree.c:2519 update_process_times+0x25/0xa0 kernel/time/timer.c:1710 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1524 [inline] __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1588 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] sysvec_apic_timer_interrupt+0x4c/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x8c/0xe0 kernel/locking/spinlock.c:191 Code: 48 c7 c0 c8 3b b6 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 37 48 83 3d f3 ef bf 01 00 74 22 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 95 67 59 f9 65 8b 05 8e b2 0b 78 RSP: 0018:ffffc90000007b60 EFLAGS: 00000286 RAX: 1ffffffff136c779 RBX: 0000000000000286 RCX: 0000000000000002 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000286 RBP: ffffffff8cb73df8 R08: 0000000000000001 R09: ffffffff8c5f3aef R10: fffffbfff18be75d R11: 0000000000000001 R12: ffff88805a6736c8 R13: dffffc0000000000 R14: 1ffff92000000f71 R15: ffffffff89bd6780 debug_object_activate+0x1b3/0x3e0 lib/debugobjects.c:670 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] __call_rcu kernel/rcu/tree.c:2880 [inline] call_rcu+0x2c/0x7e0 kernel/rcu/tree.c:2968 inet_frag_destroy+0x106/0x170 net/ipv4/inet_fragment.c:269 inet_frag_put include/net/inet_frag.h:134 [inline] ipq_put net/ipv4/ip_fragment.c:110 [inline] ip_expire+0x32c/0x830 net/ipv4/ip_fragment.c:197 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768 __do_softirq+0x2de/0xa24 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 </IRQ> __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/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+0x1f3/0x230 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:generic_exec_single+0x309/0x480 kernel/smp.c:172 Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 63 01 00 00 48 83 3d ef 09 4d 08 00 0f 84 dc 00 00 00 e8 2c 0d 0b 00 48 89 df 57 9d <0f> 1f 44 00 00 45 31 e4 e9 e1 fd ff ff e8 15 0d 0b 00 0f 0b e9 42 RSP: 0018:ffffc900065efb08 EFLAGS: 00000212 RAX: 000000000000112c RBX: 0000000000000212 RCX: ffffc90013037000 RDX: 0000000000040000 RSI: ffffffff816931e4 RDI: 0000000000000212 RBP: 0000000000000200 R08: 0000000000000001 R09: ffffffff8c5f3abf R10: fffffbfff18be757 R11: 0000000000000001 R12: ffffc900065efb80 R13: ffffffff818db660 R14: ffffc900065efc48 R15: 1ffff92000cbdf9e smp_call_function_single+0x186/0x4f0 kernel/smp.c:379 task_function_call+0xd7/0x160 kernel/events/core.c:116 perf_install_in_context+0x2cb/0x550 kernel/events/core.c:2895 __do_sys_perf_event_open+0x1c31/0x2cb0 kernel/events/core.c:11992 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: 5d 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0b6563ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000024780 RCX: 000000000045d5b9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 RBP: 000000000118cf90 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffe39e7392f R14: 00007f0b6563f9c0 R15: 000000000118cf4c