watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [syz.6.688:7020]
Modules linked in:
irq event stamp: 1177293
hardirqs last  enabled at (1177292): [<ffff8000083c7520>] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline]
hardirqs last  enabled at (1177292): [<ffff8000083c7520>] timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
hardirqs last  enabled at (1177292): [<ffff8000083c7520>] timekeeping_get_ns+0x120/0x3b8 kernel/time/timekeeping.c:388
hardirqs last disabled at (1177293): [<ffff800011b9d1bc>] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline]
hardirqs last disabled at (1177293): [<ffff800011b9d1bc>] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486
softirqs last  enabled at (912): [<ffff800008031254>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (924): [<ffff80000ff07288>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
CPU: 0 PID: 7020 Comm: syz.6.688 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : __sanitizer_cov_trace_cmp4+0xa8/0xac kernel/kcov.c:284
lr : cake_heapify+0x250/0x464 net/sched/sch_cake.c:1499
sp : ffff8000210c6cd0
x29: ffff8000210c6ce0 x28: 00000000000198d0 x27: 000000000000149a
x26: ffff0000ef4402d8 x25: dfff800000000000 x24: 1fffe0001de8805a
x23: 0000000000000a4c x22: 0000000000000a4c x21: 0000000000000000
x20: ffff0000ef4402d0 x19: 0000000000000a4c x18: 0000000000000000
x17: 0000000000000000 x16: ffff8000082dd25c x15: 0000000000000002
x14: 0000000000000004 x13: 1ffff00002a74071 x12: 0000000000080000
x11: ff008000101a4b28 x10: 0000000000000002 x9 : ffff0000ff373800
x8 : ffff8000101a4b28 x7 : ffff8000083c7930 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000002 x1 : 0000000000000a4c x0 : 0000000000000a4c
Call trace:
 __sanitizer_cov_trace_cmp4+0xa8/0xac kernel/kcov.c:284
 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+0x24/0x34 include/linux/netdevice.h:3053
 packet_snd net/packet/af_packet.c:3160 [inline]
 packet_sendmsg+0x2de8/0x3d64 net/packet/af_packet.c:3191
 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