rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=549/1/0x4000000000000000 softirq=12034/12034 fqs=5187 
	(t=10500 jiffies g=15301 q=910)
NMI backtrace for cpu 1
CPU: 1 PID: 5800 Comm: syz.2.238 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x22f/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31d/0x5f0 kernel/rcu/tree_stall.h:633
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x6d8/0x1110 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4fe/0xc40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:qdisc_dev include/net/sch_generic.h:589 [inline]
RIP: 0010:qdisc_match_from_root net/sched/sch_api.c:263 [inline]
RIP: 0010:qdisc_lookup+0xd7/0x650 net/sched/sch_api.c:304
Code: fc ff df 4d 8d be 50 04 00 00 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 63 fa ce f9 4d 8b 3f 4d 8d 67 40 4c 89 e0 <48> c1 e8 03 42 80 3c 28 00 74 08 4c 89 e7 e8 46 fa ce f9 4c 89 34
RSP: 0018:ffffc9000450ef10 EFLAGS: 00000246
RAX: ffff88807ba89840 RBX: 00000000ffff0000 RCX: 0000000000080000
RDX: ffffc90004ef9000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000001 R08: ffff88807f450000 R09: 0000000000000002
R10: 00000000ffffffff R11: 0000000000000002 R12: ffff88807ba89840
R13: dffffc0000000000 R14: ffff8880195b2000 R15: ffff88807ba89800
 qdisc_tree_reduce_backlog+0x190/0x430 net/sched/sch_api.c:783
 fq_pie_change+0xaac/0x1030 net/sched/sch_fq_pie.c:369
 fq_pie_init+0x38f/0x820 net/sched/sch_fq_pie.c:431
 qdisc_create+0x7bd/0x1170 net/sched/sch_api.c:1255
 tc_modify_qdisc+0xaa1/0x1770 net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0x7ff/0xe90 net/core/rtnetlink.c:5684
 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:706 [inline]
 __sock_sendmsg net/socket.c:718 [inline]
 ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2446
 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2500
 __sys_sendmsg net/socket.c:2529 [inline]
 __do_sys_sendmsg net/socket.c:2538 [inline]
 __se_sys_sendmsg+0x190/0x250 net/socket.c:2536
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f0c6e70d749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0c6c974038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f0c6e963fa0 RCX: 00007f0c6e70d749
RDX: 00000000000400c4 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f0c6e791f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0c6e964038 R14: 00007f0c6e963fa0 R15: 00007ffc8bcc4f68
 </TASK>