watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [syz.5.1532:9798] Modules linked in: irq event stamp: 1213041 hardirqs last enabled at (1213040): [] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] hardirqs last enabled at (1213040): [] timekeeping_get_delta kernel/time/timekeeping.c:254 [inline] hardirqs last enabled at (1213040): [] timekeeping_get_ns+0x120/0x3b8 kernel/time/timekeeping.c:388 hardirqs last disabled at (1213041): [] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline] hardirqs last disabled at (1213041): [] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486 softirqs last enabled at (866): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (928): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 0 PID: 9798 Comm: syz.5.1532 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : __sanitizer_cov_trace_pc+0x64/0x90 kernel/kcov.c:215 lr : cake_heapify+0x30/0x464 net/sched/sch_cake.c:1472 sp : ffff800022a26500 x29: ffff800022a26520 x28: 0000000000000000 x27: ffff0000f03f8000 x26: 0000000000000000 x25: dfff800000000000 x24: 1fffe0001e07f85b x23: ffff0000f03fc2d8 x22: ffff0000f03f82c0 x21: ffff0000f03fc328 x20: 0000000000000500 x19: 000000000000008a x18: 000000000004fffe x17: ffff8000154671c0 x16: ffff8000082dd284 x15: 000000000004ffff x14: 0000000000000001 x13: 1ffff00002a78071 x12: 0000000000080000 x11: ff008000101b34e4 x10: 0000000000000002 x9 : ffff8000101b34e4 x8 : ffff0000cf69b800 x7 : ffff8000083c7974 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000002 x1 : 000000000000008a x0 : ffff0000f03f82c0 Call trace: __sanitizer_cov_trace_pc+0x64/0x90 kernel/kcov.c:212 cake_drop net/sched/sch_cake.c:1571 [inline] cake_enqueue+0x36c0/0x6a18 net/sched/sch_cake.c:1945 qdisc_enqueue include/net/sch_generic.h:855 [inline] netem_dequeue+0xa00/0x1018 net/sched/sch_netem.c:736 dequeue_skb net/sched/sch_generic.c:295 [inline] qdisc_restart net/sched/sch_generic.c:400 [inline] __qdisc_run+0x1b4/0x1300 net/sched/sch_generic.c:418 __dev_xmit_skb net/core/dev.c:3995 [inline] __dev_queue_xmit+0xc38/0x3154 net/core/dev.c:4337 dev_queue_xmit include/linux/netdevice.h:3053 [inline] tipc_l2_send_msg+0x2a0/0x364 net/tipc/bearer.c:519 tipc_bearer_xmit_skb+0x240/0x380 net/tipc/bearer.c:578 tipc_enable_bearer net/tipc/bearer.c:368 [inline] __tipc_nl_bearer_enable+0xe1c/0x1170 net/tipc/bearer.c:1050 __tipc_nl_compat_doit net/tipc/netlink_compat.c:379 [inline] tipc_nl_compat_doit+0x348/0x568 net/tipc/netlink_compat.c:401 tipc_nl_compat_handle net/tipc/netlink_compat.c:-1 [inline] tipc_nl_compat_recv+0x684/0x988 net/tipc/netlink_compat.c:1329 genl_family_rcv_msg_doit+0x210/0x308 net/netlink/genetlink.c:756 genl_family_rcv_msg net/netlink/genetlink.c:833 [inline] genl_rcv_msg+0x424/0x600 net/netlink/genetlink.c:850 netlink_rcv_skb+0x220/0x3ec net/netlink/af_netlink.c:2516 genl_rcv+0x38/0x50 net/netlink/genetlink.c:861 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x5fc/0x80c net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6f0/0x9d8 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x588/0x90c net/socket.c:2519 ___sys_sendmsg net/socket.c:2573 [inline] __sys_sendmsg+0x288/0x374 net/socket.c:2602 __do_sys_sendmsg net/socket.c:2611 [inline] __se_sys_sendmsg net/socket.c:2609 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2609 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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