watchdog: BUG: soft lockup - CPU#1 stuck for 26s! [syz.0.155:5319]
Modules linked in:
irq event stamp: 14177
hardirqs last  enabled at (14176): [<ffff8000118fc2fc>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last  enabled at (14176): [<ffff8000118fc2fc>] exit_to_kernel_mode+0xcc/0xfc arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (14177): [<ffff8000118fa310>] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline]
hardirqs last disabled at (14177): [<ffff8000118fa310>] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486
softirqs last  enabled at (8592): [<ffff80000fcde094>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (8600): [<ffff80000ff72bf4>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (8600): [<ffff80000ff72bf4>] sch_tree_lock include/net/sch_generic.h:-1 [inline]
softirqs last disabled at (8600): [<ffff80000ff72bf4>] hhf_change+0x290/0xbb8 net/sched/sch_hhf.c:534
CPU: 1 PID: 5319 Comm: syz.0.155 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : arch_local_irq_restore+0x8/0x10 arch/arm64/include/asm/irqflags.h:131
lr : lock_is_held_type+0x140/0x198 kernel/locking/lockdep.c:5707
sp : ffff800020fb6d00
x29: ffff800020fb6d00 x28: 1ffff0000273452c x27: dfff800000000000
x26: ffff0000d473b780 x25: ffff800014fa5d00 x24: ffff8000150f72a0
x23: 0000000000000002 x22: ffff0000d473c248 x21: ffff800015227400
x20: 0000000000000001 x19: 0000000000000000 x18: 00000000836c327b
x17: ffff800018184000 x16: ffff8000082d2558 x15: 0000000000000002
x14: 00000000ffffffff x13: 0000000000ff0100 x12: 0000000000080000
x11: 000000000007ffff x10: 0000000000000003 x9 : 0000000000000000
x8 : 00000000000000c0 x7 : ffff80000fe6a5e0 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000008 x1 : ffff800011a5e980 x0 : 0000000000000000
Call trace:
 arch_local_irq_restore+0x8/0x10 arch/arm64/include/asm/irqflags.h:122
 lock_is_held include/linux/lockdep.h:283 [inline]
 rcu_read_lock_held+0x34/0x50 kernel/rcu/update.c:311
 qdisc_lookup_rcu+0x74/0x668 net/sched/sch_api.c:324
 qdisc_tree_reduce_backlog+0x188/0x410 net/sched/sch_api.c:791
 hhf_change+0x6c4/0xbb8 net/sched/sch_hhf.c:567
 hhf_init+0x1b0/0x6fc net/sched/sch_hhf.c:593
 qdisc_create+0x6f0/0xe20 net/sched/sch_api.c:1305
 tc_modify_qdisc+0x950/0x178c net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0x734/0xce4 net/core/rtnetlink.c:6150
 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2511
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6168
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x60c/0x824 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x6e8/0x9b0 net/netlink/af_netlink.c:1872
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5b8/0x918 net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x25c/0x320 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+0x98/0x2bc 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