Warning: Permanently added '10.128.1.19' (ED25519) to the list of known hosts. executing program [ 159.021519][ C1] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 159.028746][ C1] (detected by 1, t=10502 jiffies, g=4185, q=26) [ 159.035254][ C1] rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294953059-4294942557), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 159.048710][ C1] rcu: rcu_preempt kthread starved for 10502 jiffies! g4185 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 159.059825][ C1] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. [ 159.069887][ C1] rcu: RCU grace-period kthread stack dump: [ 159.075775][ C1] task:rcu_preempt state:R running task stack:27848 pid: 15 ppid: 2 flags:0x00004000 [ 159.086753][ C1] Call Trace: [ 159.090042][ C1] [ 159.092988][ C1] __schedule+0x11b8/0x43b0 [ 159.097531][ C1] ? _raw_spin_lock_irqsave+0x7f/0xf0 [ 159.103011][ C1] ? _raw_spin_unlock_irqrestore+0x82/0x100 [ 159.108919][ C1] ? _raw_spin_unlock_irqrestore+0xaa/0x100 [ 159.115001][ C1] ? _raw_spin_unlock+0x40/0x40 [ 159.119886][ C1] ? rcu_is_watching+0x11/0xa0 [ 159.124743][ C1] ? release_firmware_map_entry+0x190/0x190 [ 159.130655][ C1] schedule+0x11b/0x1e0 [ 159.134829][ C1] schedule_timeout+0x15c/0x280 [ 159.139698][ C1] ? console_conditional_schedule+0x40/0x40 [ 159.145601][ C1] ? update_process_times+0x200/0x200 [ 159.151046][ C1] ? prepare_to_swait_event+0x331/0x350 [ 159.156621][ C1] rcu_gp_fqs_loop+0x29e/0x11b0 [ 159.161485][ C1] ? lockdep_hardirqs_on+0x94/0x140 [ 159.166702][ C1] ? rcu_gp_init+0xd58/0x10e0 [ 159.171428][ C1] ? rcu_gp_init+0x10e0/0x10e0 [ 159.176245][ C1] ? _raw_spin_unlock_irq+0x1f/0x40 [ 159.181569][ C1] ? lockdep_hardirqs_on+0x94/0x140 [ 159.186794][ C1] rcu_gp_kthread+0x98/0x350 [ 159.191411][ C1] ? rcu_report_qs_rsp+0x1a0/0x1a0 [ 159.196970][ C1] ? _raw_spin_unlock_irqrestore+0xaa/0x100 [ 159.202875][ C1] ? __kthread_parkme+0x157/0x1b0 [ 159.207914][ C1] kthread+0x436/0x520 [ 159.211991][ C1] ? rcu_report_qs_rsp+0x1a0/0x1a0 [ 159.217111][ C1] ? kthread_blkcg+0xd0/0xd0 [ 159.221711][ C1] ret_from_fork+0x1f/0x30 [ 159.226149][ C1] [ 159.229179][ C1] rcu: Stack dump where RCU GP kthread last ran: [ 159.235501][ C1] NMI backtrace for cpu 1 [ 159.239838][ C1] CPU: 1 PID: 4194 Comm: syz-executor252 Not tainted 5.15.189-syzkaller #0 [ 159.248429][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 [ 159.258583][ C1] Call Trace: [ 159.261870][ C1] [ 159.264721][ C1] dump_stack_lvl+0x168/0x230 [ 159.269415][ C1] ? show_regs_print_info+0x20/0x20 [ 159.274621][ C1] ? load_image+0x3b0/0x3b0 [ 159.279228][ C1] ? irq_work_queue+0xbf/0x140 [ 159.284012][ C1] nmi_cpu_backtrace+0x397/0x3d0 [ 159.288965][ C1] ? nmi_trigger_cpumask_backtrace+0x280/0x280 [ 159.295130][ C1] ? _printk+0xcc/0x110 [ 159.299299][ C1] ? cpu_online+0x1d/0x30 [ 159.303654][ C1] ? load_image+0x3b0/0x3b0 [ 159.308170][ C1] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 159.314244][ C1] nmi_trigger_cpumask_backtrace+0x163/0x280 [ 159.320239][ C1] rcu_check_gp_kthread_starvation+0x1cd/0x250 [ 159.326410][ C1] print_other_cpu_stall+0x10c8/0x1220 [ 159.331893][ C1] ? print_cpu_stall+0x5f0/0x5f0 [ 159.336837][ C1] ? timekeeping_advance+0x7f6/0xac0 [ 159.342133][ C1] ? __lock_acquire+0x7c60/0x7c60 [ 159.347182][ C1] rcu_sched_clock_irq+0x831/0x1110 [ 159.352397][ C1] ? rcutree_dead_cpu+0x20/0x20 [ 159.357259][ C1] ? hrtimer_run_queues+0x162/0x440 [ 159.362475][ C1] ? account_process_tick+0x227/0x3a0 [ 159.367866][ C1] update_process_times+0x193/0x200 [ 159.373083][ C1] tick_sched_timer+0x37d/0x560 [ 159.378148][ C1] __hrtimer_run_queues+0x4fe/0xc40 [ 159.383362][ C1] ? tick_setup_sched_timer+0x2c0/0x2c0 [ 159.388931][ C1] ? hrtimer_interrupt+0x8d0/0x8d0 [ 159.394055][ C1] ? ktime_get_update_offsets_now+0x3ce/0x3e0 [ 159.400136][ C1] hrtimer_interrupt+0x3bb/0x8d0 [ 159.405117][ C1] __sysvec_apic_timer_interrupt+0x137/0x4a0 [ 159.411110][ C1] sysvec_apic_timer_interrupt+0x9b/0xc0 [ 159.416754][ C1] [ 159.419690][ C1] [ 159.422638][ C1] asm_sysvec_apic_timer_interrupt+0x16/0x20 [ 159.428631][ C1] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 [ 159.434617][ C1] Code: f6 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 7e db aa f7 48 89 df e8 46 b0 ab f7 e8 91 46 cc f7 fb bf 01 00 00 00 76 d4 9f f7 65 8b 05 17 d4 50 76 85 c0 74 02 5b c3 e8 c4 de 4e [ 159.454254][ C1] RSP: 0018:ffffc90002e0fbc0 EFLAGS: 00000282 [ 159.460350][ C1] RAX: 989c8e6f3f2dec00 RBX: ffff88802a64c0c0 RCX: 989c8e6f3f2dec00 [ 159.468344][ C1] RDX: dffffc0000000000 RSI: ffffffff8a0b15c0 RDI: 0000000000000001 [ 159.476411][ C1] RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed10054c9819 [ 159.484396][ C1] R10: ffffed10054c9819 R11: 1ffff110054c9818 R12: ffff88802a64c0c0 [ 159.492386][ C1] R13: 0000000000000021 R14: dffffc0000000000 R15: 000000001c000004 [ 159.500436][ C1] get_signal+0x11d6/0x12c0 [ 159.504980][ C1] arch_do_signal_or_restart+0xc1/0x1300 [ 159.510623][ C1] ? _copy_from_user+0x111/0x170 [ 159.515578][ C1] ? __ia32_sys_rt_sigreturn+0x660/0x790 [ 159.521227][ C1] ? load_gs_index+0x120/0x120 [ 159.526001][ C1] ? get_sigframe_size+0x10/0x10 [ 159.530979][ C1] ? exit_to_user_mode_loop+0x3b/0x130 [ 159.536458][ C1] exit_to_user_mode_loop+0x9e/0x130 [ 159.541759][ C1] exit_to_user_mode_prepare+0xb1/0x140 [ 159.547337][ C1] syscall_exit_to_user_mode+0x16/0x40 [ 159.552823][ C1] do_syscall_64+0x58/0xa0 [ 159.557260][ C1] ? clear_bhb_loop+0x30/0x80 [ 159.561968][ C1] ? clear_bhb_loop+0x30/0x80 [ 159.566678][ C1] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 159.572854][ C1] RIP: 0033:0x7f392c4c9f17 [ 159.577291][ C1] Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 [ 159.597169][ C1] RSP: 002b:00007f392c48a178 EFLAGS: 00000246 [ 159.603254][ C1] RAX: 00000000000000ca RBX: 00007f392c554308 RCX: 00007f392c4c9f19 [ 159.611243][ C1] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f392c554308 [ 159.619318][ C1] RBP: 00007f392c554300 R08: 00007f392c48a6c0 R09: 00007f392c48a6c0 [ 159.627413][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f392c55430c [ 159.635409][ C1] R13: 0000000000000000 R14: 00007ffd033e2050 R15: 00007ffd033e2138 [ 159.643490][ C1]