watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz.4.511:6617] Modules linked in: irq event stamp: 1253579 hardirqs last enabled at (1253578): [] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] hardirqs last enabled at (1253578): [] timekeeping_get_delta kernel/time/timekeeping.c:254 [inline] hardirqs last enabled at (1253578): [] timekeeping_get_ns+0x124/0x3b8 kernel/time/timekeeping.c:388 hardirqs last disabled at (1253579): [] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline] hardirqs last disabled at (1253579): [] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486 softirqs last enabled at (1358): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (1358): [] tipc_disc_reset+0x1dc/0x2f8 net/tipc/discover.c:417 softirqs last disabled at (1360): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 PID: 6617 Comm: syz.4.511 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : cake_heapify+0x4dc/0x530 net/sched/sch_cake.c:1510 lr : cake_heapify+0x4c4/0x530 net/sched/sch_cake.c:1503 sp : ffff800021b86a50 x29: ffff800021b86a60 x28: dfff800000000000 x27: 00000000000198d0 x26: 000000000003c166 x25: ffff0000db6fc2d8 x24: 0000000000000000 x23: ffff0000db6f82d0 x22: ffff0000db6fc2d8 x21: ffff0000db6f82c0 x20: 0000000000000500 x19: 0000000000000991 x18: ffff800011abbcc0 x17: ffff8000181f9000 x16: ffff8000082d22e0 x15: ffff800017cd9fc0 x14: ffff0000dab6ddd8 x13: 1ffff00002a180b1 x12: 0000000000080000 x11: 000000000007ffff x10: ffff80002aa72000 x9 : ffff80000ffc9c34 x8 : 0000000000080000 x7 : ffff8000083b9870 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : 0000000000000991 x0 : 0000000000000991 Call trace: cake_heapify+0x4dc/0x530 net/sched/sch_cake.c:1510 cake_drop net/sched/sch_cake.c:1575 [inline] cake_enqueue+0x32dc/0x6670 net/sched/sch_cake.c:1948 qdisc_enqueue include/net/sch_generic.h:816 [inline] netem_dequeue+0xa74/0x107c net/sched/sch_netem.c:737 dequeue_skb net/sched/sch_generic.c:292 [inline] qdisc_restart net/sched/sch_generic.c:397 [inline] __qdisc_run+0x1c4/0x1368 net/sched/sch_generic.c:415 __dev_xmit_skb net/core/dev.c:3970 [inline] __dev_queue_xmit+0xc18/0x309c net/core/dev.c:4312 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_reset+0x200/0x2f8 net/tipc/discover.c:419 tipc_reset_bearer+0x5c/0x84 net/tipc/bearer.c:387 tipc_l2_device_event+0x498/0x778 net/tipc/bearer.c:-1 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:2001 [inline] call_netdevice_notifiers_mtu+0x118/0x19c net/core/dev.c:2076 dev_set_mtu_ext+0x350/0x514 net/core/dev.c:8780 dev_set_mtu+0x50/0xe8 net/core/dev.c:8801 dev_ifsioc+0x250/0xed0 net/core/dev_ioctl.c:334 dev_ioctl+0x4c8/0xc8c net/core/dev_ioctl.c:588 sock_do_ioctl+0x18c/0x240 net/socket.c:1218 sock_ioctl+0x5c4/0x840 net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585