watchdog: BUG: soft lockup - CPU#1 stuck for 22s! [syz.4.1508:9039]
Modules linked in:
irq event stamp: 4821
hardirqs last  enabled at (4820): [<ffff8000119475f4>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last  enabled at (4820): [<ffff8000119475f4>] exit_to_kernel_mode+0xcc/0xfc arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (4821): [<ffff800011945608>] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline]
hardirqs last disabled at (4821): [<ffff800011945608>] el1_interrupt+0x24/0x54 arch/arm64/kernel/entry-common.c:486
softirqs last  enabled at (400): [<ffff80000fd2ebc8>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (420): [<ffff80000ffa36a8>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (420): [<ffff80000ffa36a8>] sch_tree_lock+0x120/0x1d4 include/net/sch_generic.h:-1
CPU: 1 PID: 9039 Comm: syz.4.1508 Not tainted 6.1.144-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : check_preemption_disabled+0x34/0x104 lib/smp_processor_id.c:16
lr : check_preemption_disabled+0x28/0x104 lib/smp_processor_id.c:14
sp : ffff800022656c90
x29: ffff800022656ca0 x28: 1ffff0000273e894 x27: dfff800000000000
x26: 0000000000000000 x25: ffff0000dc9ae840 x24: ffff0000dec7a000
x23: dfff800000000000 x22: ffff800011f99960 x21: ffff800011f999a0
x20: ffff800011949488 x19: 0000000000000001 x18: ffff800011aabce0
x17: 1fffe00033eddf7e x16: ffff8000082d0f50 x15: 0000000000000002
x14: 00000000ffffffff x13: 0000000000ff0100 x12: 0000000000080000
x11: 000000000007ffff x10: ffff800027e59000 x9 : ffff80000a88c070
x8 : ffff800015003008 x7 : ffff80000febbedc x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000008 x1 : ffff800011f999a0 x0 : ffff80018a6ea000
Call trace:
 check_preemption_disabled+0x34/0x104 lib/smp_processor_id.c:14
 debug_smp_processor_id+0x20/0x2c lib/smp_processor_id.c:60
 rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
 rcu_is_watching+0x50/0x134 kernel/rcu/tree.c:721
 rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
 rcu_read_lock_held+0x18/0x50 kernel/rcu/update.c:309
 qdisc_lookup_rcu+0x334/0x668 net/sched/sch_api.c:330
 qdisc_tree_reduce_backlog+0x188/0x410 net/sched/sch_api.c:796
 fq_codel_change+0x870/0xbdc net/sched/sch_fq_codel.c:440
 fq_codel_init+0x284/0x7b8 net/sched/sch_fq_codel.c:477
 qdisc_create+0x6f0/0xe20 net/sched/sch_api.c:1310
 tc_modify_qdisc+0x954/0x1718 net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0x734/0xce4 net/core/rtnetlink.c:6153
 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2493
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6171
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x600/0x818 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0x6e8/0x9b0 net/netlink/af_netlink.c:1859
 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