Hello,

My system was stable with 5.13.0, though there was a KASAN warning. So, I upgrade to 5.13.5, and now it takes a very long time to fully boot to login prompt, and I see this splat in the logs.

I'm working on bisecting, but if someone has a clue, please let me know.

[ 2187.021338] irq 4: nobody cared (try booting with the "irqpoll" option) [ 2187.026825] CPU: 7 PID: 48 Comm: ksoftirqd/7 Not tainted 5.13.5+ #26 [ 2187.026830] Hardware name: Default string Default string/SKYBAY, BIOS 5.12 02/19/2019 [ 2187.026832] Call Trace: [ 2187.026834] <IRQ> [ 2187.026836] dump_stack+0x9b/0xce [ 2187.026844] __report_bad_irq+0x3d/0xd7 [ 2187.026848] note_interrupt.cold.9+0xa/0x8b [ 2187.026851] ? add_interrupt_randomness+0x15a/0x2a0 [ 2187.026857] handle_irq_event_percpu+0xd6/0xe0 [ 2187.026862] ? __handle_irq_event_percpu+0x250/0x250 [ 2187.026865] ? _raw_spin_lock+0x7c/0xd0 [ 2187.026872] ? _raw_read_lock+0x30/0x30 [ 2187.026876] handle_irq_event+0x4f/0x80 [ 2187.026879] handle_fasteoi_irq+0xf7/0x210 [ 2187.026885] __common_interrupt+0x3e/0xb0 [ 2187.026890] common_interrupt+0x77/0xa0 [ 2187.026893] </IRQ> [ 2187.026895] asm_common_interrupt+0x1e/0x40 [ 2187.026898] RIP: 0010:unwind_next_frame+0x727/0xa70 [ 2187.026902] Code: 80 3d 49 6d 88 02 00 0f 85 b6 fc ff ff e9 7a 1e 1b 01 48 8b 44 24 60 4c 89 ea 48 89 df 4c 8d 7b 34 48 8d 70 f8 48 89 44 24 28 <e8> 94 f8 ff ff 84 c0 0f 84 8c fc ff ff 4c 8b 6c 24 60 48 8b 3c 24 [ 2187.026906] RSP: 0018:ffff888108d5f680 EFLAGS: 00000246 [ 2187.026909] RAX: ffff888108d5fba0 RBX: ffff888108d5f798 RCX: ffffffff810ba1f9 [ 2187.026912] RDX: ffff888108d5f7e0 RSI: ffff888108d5fb98 RDI: ffff888108d5f798 [ 2187.026915] RBP: 1ffff110211abed8 R08: fffffbfff07eb294 R09: fffffbfff07eb294 [ 2187.026917] R10: ffffffff83f5949d R11: fffffbfff07eb293 R12: 0000000000000001 [ 2187.026919] R13: ffff888108d5f7e0 R14: ffffffff83f5949c R15: ffff888108d5f7cc [ 2187.026922] ? unwind_next_frame+0x529/0xa70 [ 2187.026926] ? packet_rcv+0x73/0x8e0 [ 2187.026931] ? packet_rcv+0x72/0x8e0 [ 2187.026934] ? deref_stack_reg+0x40/0x40 [ 2187.026937] ? unwind_next_frame+0x334/0xa70 [ 2187.026940] ? ret_from_fork+0x1f/0x30 [ 2187.026945] ? get_stack_info_noinstr+0x12/0xe0 [ 2187.026948] ? packet_rcv+0x73/0x8e0 [ 2187.026951] ? create_prof_cpu_mask+0x20/0x20 [ 2187.026955] arch_stack_walk+0x80/0xe0 [ 2187.026959] ? packet_rcv+0x73/0x8e0 [ 2187.026963] ? packet_rcv+0x73/0x8e0 [ 2187.026966] stack_trace_save+0x85/0xb0 [ 2187.026969] ? stack_trace_consume_entry+0x80/0x80 [ 2187.026973] kasan_save_stack+0x19/0x40 [ 2187.026977] ? kasan_save_stack+0x19/0x40 [ 2187.026981] ? kasan_set_track+0x1c/0x30 [ 2187.026984] ? kasan_set_free_info+0x20/0x30 [ 2187.026988] ? __kasan_slab_free+0xec/0x130 [ 2187.026991] ? kmem_cache_free+0x78/0x290 [ 2187.026994] ? packet_rcv+0x73/0x8e0 [ 2187.026998] ? kasan_save_stack+0x2f/0x40 [ 2187.027001] ? kasan_save_stack+0x19/0x40 [ 2187.027004] ? __kasan_slab_alloc+0x68/0x80 [ 2187.027007] ? kmem_cache_alloc+0xc5/0x1f0 [ 2187.027010] ? skb_clone+0x80/0x160 [ 2187.027015] ? dev_queue_xmit_nit+0x19d/0x410 [ 2187.027020] ? dev_hard_start_xmit+0x7f/0x330 [ 2187.027024] ? sch_direct_xmit+0x116/0x580 [ 2187.027030] ? __qdisc_run+0x23b/0x920 [ 2187.027033] ? net_tx_action+0x1a3/0x420 [ 2187.027036] ? __do_softirq+0xf0/0x3b8 [ 2187.027040] ? run_ksoftirqd+0x21/0x30 [ 2187.027046] ? smpboot_thread_fn+0x1b6/0x340 [ 2187.027051] ? kthread+0x1d4/0x210 [ 2187.027055] ? ret_from_fork+0x1f/0x30 [ 2187.027059] ? _raw_spin_unlock+0x9/0x20 [ 2187.027063] ? get_partial_node.isra.86.part.87+0xe0/0x280 [ 2187.027067] ? common_interrupt+0x1b/0xa0 [ 2187.027070] ? common_interrupt+0x1b/0xa0 [ 2187.027072] ? dma_map_page_attrs+0x16f/0x350 [ 2187.027077] ? common_interrupt+0x1b/0xa0 [ 2187.027080] ? asm_common_interrupt+0x1e/0x40 [ 2187.027083] ? bpf_skb_load_helper_16+0x6e/0xf0 [ 2187.027087] ? bpf_skb_load_helper_8_no_cache+0x120/0x120 [ 2187.027090] kasan_set_track+0x1c/0x30 [ 2187.027094] kasan_set_free_info+0x20/0x30 [ 2187.027097] __kasan_slab_free+0xec/0x130 [ 2187.027101] ? packet_rcv+0x73/0x8e0 [ 2187.027104] kmem_cache_free+0x78/0x290 [ 2187.027108] packet_rcv+0x73/0x8e0 [ 2187.027111] ? __skb_clone+0x271/0x2b0 [ 2187.027115] ? packet_create+0x3d0/0x3d0 [ 2187.027118] dev_queue_xmit_nit+0x401/0x410 [ 2187.027122] dev_hard_start_xmit+0x7f/0x330 [ 2187.027126] sch_direct_xmit+0x116/0x580 [ 2187.027130] ? dev_reset_queue.constprop.44+0xa0/0xa0 [ 2187.027135] ? fq_codel_dump_stats+0x310/0x310 [sch_fq_codel] [ 2187.027141] ? _raw_spin_unlock_irq+0x13/0x30 [ 2187.027144] __qdisc_run+0x23b/0x920 [ 2187.027148] net_tx_action+0x1a3/0x420 [ 2187.027152] __do_softirq+0xf0/0x3b8 [ 2187.027156] ? takeover_tasklets+0x2e0/0x2e0 [ 2187.027160] run_ksoftirqd+0x21/0x30 [ 2187.027163] smpboot_thread_fn+0x1b6/0x340 [ 2187.027167] ? smpboot_register_percpu_thread+0x180/0x180 [ 2187.027171] ? schedule+0xaa/0x140 [ 2187.027174] ? __kthread_parkme+0x94/0xb0 [ 2187.027178] ? smpboot_register_percpu_thread+0x180/0x180 [ 2187.027181] kthread+0x1d4/0x210 [ 2187.027185] ? set_kthread_struct+0x70/0x70 [ 2187.027188] ret_from_fork+0x1f/0x30 [ 2187.027193] handlers: [ 2187.028203] [<00000000ef8c02a2>] serial8250_interrupt [ 2187.032072] Disabling IRQ #4

Thanks, Ben