watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/0:5:4360] Modules linked in: irq event stamp: 620413 hardirqs last enabled at (620412): [] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] hardirqs last enabled at (620412): [] timekeeping_get_delta kernel/time/timekeeping.c:254 [inline] hardirqs last enabled at (620412): [] timekeeping_get_ns+0x124/0x3b8 kernel/time/timekeeping.c:388 hardirqs last disabled at (620413): [] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline] hardirqs last disabled at (620413): [] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486 softirqs last enabled at (265560): [] local_bh_enable+0xc/0x2c include/linux/bottom_half.h:32 softirqs last disabled at (265719): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 CPU: 0 PID: 4360 Comm: kworker/0:5 Not tainted 6.1.146-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: rcu_gp process_srcu pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __sanitizer_cov_trace_pc+0x88/0x94 kernel/kcov.c:234 lr : cake_heapify+0x4c4/0x530 net/sched/sch_cake.c:1503 sp : ffff8000080070c0 x29: ffff8000080070e0 x28: 1fffe0001bb2f85b x27: 00000000000198d0 x26: 0000000000001c14 x25: 0000000000000e09 x24: 0000000000000e09 x23: dfff800000000000 x22: 0000000000000e09 x21: 0000000000000000 x20: ffff0000dd9782d0 x19: 0000000000000e09 x18: 0000000094ca7d75 x17: 0000000000000000 x16: ffff8000082d2400 x15: 0000000000000000 x14: 0000000000000004 x13: 1ffff00002a160b1 x12: 0000000000ff0100 x11: ff0080000ffb95b4 x10: 0000000000000000 x9 : ffff80000ffb95b4 x8 : ffff0000c85c3780 x7 : ffff8000083b9900 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : 0000000000000e09 x0 : 0000000000000e09 Call trace: __sanitizer_cov_trace_pc+0x88/0x94 kernel/kcov.c:232 cake_drop net/sched/sch_cake.c:1575 [inline] cake_enqueue+0x333c/0x6880 net/sched/sch_cake.c:1945 qdisc_enqueue include/net/sch_generic.h:816 [inline] sfb_enqueue+0x794/0x1294 net/sched/sch_sfb.c:405 dev_qdisc_enqueue+0x5c/0x38c net/core/dev.c:3863 __dev_xmit_skb net/core/dev.c:3952 [inline] __dev_queue_xmit+0xad0/0x309c net/core/dev.c:4300 dev_queue_xmit include/linux/netdevice.h:3051 [inline] tipc_l2_send_msg+0x29c/0x35c net/tipc/bearer.c:518 tipc_bearer_xmit_skb+0x244/0x384 net/tipc/bearer.c:577 tipc_disc_timeout+0x4c8/0x608 net/tipc/discover.c:338 call_timer_fn+0x1b8/0x964 kernel/time/timer.c:1504 expire_timers kernel/time/timer.c:1549 [inline] __run_timers+0x460/0x6bc kernel/time/timer.c:1820 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:1833 handle_softirqs+0x318/0xc6c kernel/softirq.c:596 __do_softirq+0x14/0x20 kernel/softirq.c:630 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 call_on_irq_stack+0x24/0x30 arch/arm64/kernel/entry.S:849 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85 invoke_softirq kernel/softirq.c:477 [inline] __irq_exit_rcu+0x23c/0x43c kernel/softirq.c:679 irq_exit_rcu+0x14/0x84 kernel/softirq.c:691 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline] el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:486 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581 preempt_count arch/arm64/include/asm/preempt.h:13 [inline] check_kcov_mode kernel/kcov.c:182 [inline] __sanitizer_cov_trace_pc+0x14/0x94 kernel/kcov.c:216 __delay+0x1c8/0x280 arch/arm64/lib/delay.c:48 __const_udelay arch/arm64/lib/delay.c:55 [inline] __udelay+0x60/0x70 arch/arm64/lib/delay.c:61 try_check_zero+0x388/0x3b8 kernel/rcu/srcutree.c:975 srcu_advance_state kernel/rcu/srcutree.c:1549 [inline] process_srcu+0x16c/0xffc kernel/rcu/srcutree.c:1651 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:849