Warning: Permanently added '10.128.0.139' (ED25519) to the list of known hosts. executing program [ 175.864564][ C1] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 175.871615][ C1] (detected by 1, t=10502 jiffies, g=4393, q=43) [ 175.878035][ C1] rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294954707-4294944207), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 175.891390][ C1] rcu: rcu_preempt kthread starved for 10500 jiffies! g4393 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 175.902492][ C1] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. [ 175.912449][ C1] rcu: RCU grace-period kthread stack dump: [ 175.918342][ C1] task:rcu_preempt state:R running task stack:27008 pid: 15 ppid: 2 flags:0x00004000 [ 175.929131][ C1] Call Trace: [ 175.932402][ C1] [ 175.935334][ C1] __schedule+0x11b8/0x43b0 [ 175.939861][ C1] ? _raw_spin_lock_irqsave+0x7f/0xf0 [ 175.945234][ C1] ? _raw_spin_unlock_irqrestore+0x82/0x100 [ 175.951129][ C1] ? _raw_spin_unlock_irqrestore+0xaa/0x100 [ 175.957018][ C1] ? _raw_spin_unlock+0x40/0x40 [ 175.961873][ C1] ? rcu_is_watching+0x11/0xa0 [ 175.966634][ C1] ? release_firmware_map_entry+0x190/0x190 [ 175.972544][ C1] schedule+0x11b/0x1e0 [ 175.976703][ C1] schedule_timeout+0x15c/0x280 [ 175.981549][ C1] ? console_conditional_schedule+0x40/0x40 [ 175.987434][ C1] ? _raw_spin_unlock_irqrestore+0x82/0x100 [ 175.993330][ C1] ? update_process_times+0x200/0x200 [ 175.998702][ C1] ? prepare_to_swait_event+0x331/0x350 [ 176.004253][ C1] rcu_gp_fqs_loop+0x29e/0x11b0 [ 176.009132][ C1] ? dump_blkd_tasks+0x7e0/0x7e0 [ 176.014064][ C1] ? rcu_gp_init+0x10e0/0x10e0 [ 176.018824][ C1] ? _raw_spin_unlock_irq+0x1f/0x40 [ 176.024016][ C1] ? lockdep_hardirqs_on+0x94/0x140 [ 176.029216][ C1] rcu_gp_kthread+0x98/0x350 [ 176.033815][ C1] ? rcu_report_qs_rsp+0x1a0/0x1a0 [ 176.038920][ C1] ? _raw_spin_unlock_irqrestore+0xaa/0x100 [ 176.044815][ C1] ? __kthread_parkme+0x157/0x1b0 [ 176.049842][ C1] kthread+0x436/0x520 [ 176.053903][ C1] ? rcu_report_qs_rsp+0x1a0/0x1a0 [ 176.059005][ C1] ? kthread_blkcg+0xd0/0xd0 [ 176.063675][ C1] ret_from_fork+0x1f/0x30 [ 176.068103][ C1] [ 176.071116][ C1] rcu: Stack dump where RCU GP kthread last ran: [ 176.077434][ C1] NMI backtrace for cpu 1 [ 176.081766][ C1] CPU: 1 PID: 4202 Comm: syz-executor194 Not tainted 5.15.185-syzkaller #0 [ 176.090342][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 [ 176.100385][ C1] Call Trace: [ 176.103658][ C1] [ 176.106496][ C1] dump_stack_lvl+0x168/0x230 [ 176.111176][ C1] ? show_regs_print_info+0x20/0x20 [ 176.116367][ C1] ? load_image+0x3b0/0x3b0 [ 176.120875][ C1] ? irq_work_queue+0xbf/0x140 [ 176.125639][ C1] nmi_cpu_backtrace+0x397/0x3d0 [ 176.130580][ C1] ? nmi_trigger_cpumask_backtrace+0x280/0x280 [ 176.136732][ C1] ? _printk+0xcc/0x110 [ 176.140888][ C1] ? cpu_online+0x1d/0x30 [ 176.145211][ C1] ? load_image+0x3b0/0x3b0 [ 176.149707][ C1] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 176.155769][ C1] nmi_trigger_cpumask_backtrace+0x163/0x280 [ 176.161745][ C1] rcu_check_gp_kthread_starvation+0x1cd/0x250 [ 176.167899][ C1] print_other_cpu_stall+0x10c8/0x1220 [ 176.173358][ C1] ? print_cpu_stall+0x5f0/0x5f0 [ 176.178302][ C1] ? rcu_qs+0xc1/0x160 [ 176.182366][ C1] ? rcu_softirq_qs+0x280/0x280 [ 176.187224][ C1] rcu_sched_clock_irq+0x831/0x1110 [ 176.192421][ C1] ? rcutree_dead_cpu+0x20/0x20 [ 176.197265][ C1] ? hrtimer_run_queues+0x162/0x440 [ 176.202557][ C1] ? account_process_tick+0x227/0x3a0 [ 176.207927][ C1] update_process_times+0x193/0x200 [ 176.213127][ C1] tick_sched_timer+0x37d/0x560 [ 176.217977][ C1] __hrtimer_run_queues+0x4fe/0xc40 [ 176.223177][ C1] ? tick_setup_sched_timer+0x2c0/0x2c0 [ 176.228729][ C1] ? hrtimer_interrupt+0x8d0/0x8d0 [ 176.233835][ C1] ? ktime_get_update_offsets_now+0x3ce/0x3e0 [ 176.239900][ C1] hrtimer_interrupt+0x3bb/0x8d0 [ 176.244857][ C1] __sysvec_apic_timer_interrupt+0x137/0x4a0 [ 176.250832][ C1] sysvec_apic_timer_interrupt+0x9b/0xc0 [ 176.256462][ C1] [ 176.259386][ C1] [ 176.262310][ C1] asm_sysvec_apic_timer_interrupt+0x16/0x20 [ 176.268394][ C1] RIP: 0010:lock_acquire+0x1f2/0x3f0 [ 176.273686][ C1] Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f6 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b [ 176.293305][ C1] RSP: 0018:ffffc90002f6f9e0 EFLAGS: 00000206 [ 176.299384][ C1] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 8f8dc71cb4cc1300 [ 176.307352][ C1] RDX: 0000000000000000 RSI: ffffffff8a0b2460 RDI: ffffffff8a59a740 [ 176.315320][ C1] RBP: ffffc90002f6faf8 R08: dffffc0000000000 R09: fffffbfff1ff361f [ 176.323292][ C1] R10: fffffbfff1ff361f R11: 1ffffffff1ff361e R12: ffff888079da1d28 [ 176.331256][ C1] R13: 1ffff920005edf48 R14: 0000000000000246 R15: dffffc0000000000 [ 176.339255][ C1] ? __might_sleep+0xf0/0xf0 [ 176.343849][ C1] ? read_lock_is_recursive+0x10/0x10 [ 176.349219][ C1] ? lockdep_hardirqs_on_prepare+0x3fc/0x760 [ 176.355202][ C1] ? mark_lock+0x94/0x320 [ 176.359535][ C1] __might_fault+0xb3/0x110 [ 176.364292][ C1] ? __might_fault+0x90/0x110 [ 176.368980][ C1] fpu__restore_sig+0x203/0xf50 [ 176.373845][ C1] ? copy_fpstate_to_sigframe+0xb90/0xb90 [ 176.379590][ C1] ? __might_fault+0xb3/0x110 [ 176.384280][ C1] ? _copy_from_user+0x111/0x170 [ 176.389230][ C1] __ia32_sys_rt_sigreturn+0x649/0x790 [ 176.394718][ C1] ? load_gs_index+0x120/0x120 [ 176.399500][ C1] ? lock_chain_count+0x20/0x20 [ 176.404364][ C1] ? vtime_user_exit+0x2dc/0x400 [ 176.409503][ C1] ? lockdep_hardirqs_on+0x94/0x140 [ 176.414719][ C1] do_syscall_64+0x4c/0xa0 [ 176.419139][ C1] ? clear_bhb_loop+0x30/0x80 [ 176.423813][ C1] ? clear_bhb_loop+0x30/0x80 [ 176.428492][ C1] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 176.434396][ C1] RIP: 0033:0x7f4532670899 [ 176.438820][ C1] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 19 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 01 48 [ 176.458424][ C1] RSP: 002b:00007ffcc3c88a08 EFLAGS: 00000246 [ 176.464493][ C1] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f4532670899 [ 176.472891][ C1] RDX: 000020000006b000 RSI: 0000000000000000 RDI: 0000000000000000 [ 176.480858][ C1] RBP: 0000000000000000 R08: 00007f4532630990 R09: 00007f4532630990 [ 176.488825][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f45326ce33c [ 176.496789][ C1] R13: 00007f45326c8106 R14: 00007ffcc3c88a40 R15: 0000000000000000 [ 176.504773][ C1]