rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=1e24/1/0x4000000000000000 softirq=161745/161746 fqs=5175 rcu: hardirqs softirqs csw/system rcu: number: 8264 0 0 rcu: cputime: 487 51991 19 ==> 52480(ms) rcu: (t=10500 jiffies g=151237 q=6025 ncpus=2) CPU: 0 UID: 0 PID: 27346 Comm: syz.4.5422 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__sanitizer_cov_trace_pc+0x5d/0x70 kernel/kcov.c:235 Code: 48 16 00 00 83 fa 02 75 21 48 8b 91 50 16 00 00 48 8b 32 48 8d 7e 01 8b 89 4c 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 0e 27 9c 09 cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 RSP: 0018:ffffc90000007c68 EFLAGS: 00000246 RAX: ffffffff8970cc2a RBX: ffff88807b417000 RCX: ffff888025cadb80 RDX: 0000000000000100 RSI: 0000000000000009 RDI: ffff88807b417000 RBP: 1ffff1100f682e6a R08: ffffffff89702086 R09: ffffffff8df41aa0 R10: 0000000000000001 R11: ffffffff89634ae0 R12: dffffc0000000000 R13: ffff88807b417354 R14: ffff88805337f800 R15: 0000000000000009 FS: 00007fd66db496c0(0000) GS:ffff888125e1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c29ba1f CR3: 000000006b2c4000 CR4: 00000000003526f0 Call Trace: taprio_dequeue_from_txq+0x2a/0x980 net/sched/sch_taprio.c:709 taprio_dequeue_tc_priority+0x1ac/0x750 net/sched/sch_taprio.c:793 taprio_dequeue+0x186/0x550 net/sched/sch_taprio.c:-1 dequeue_skb net/sched/sch_generic.c:297 [inline] qdisc_restart net/sched/sch_generic.c:402 [inline] __qdisc_run+0x23f/0x1510 net/sched/sch_generic.c:420 qdisc_run+0xc7/0x300 include/net/pkt_sched.h:120 net_tx_action+0x717/0x900 net/core/dev.c:5795 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lockdep_unregister_key+0x2ce/0x350 kernel/locking/lockdep.c:6616 Code: 41 5d 41 5e 41 5f 5d e9 a0 f1 08 00 89 c7 e8 79 07 00 00 e9 6c fe ff ff e8 df 0d bc 09 41 f7 c7 00 02 00 00 74 bb fb 40 84 ed <75> ba eb cb 90 0f 0b 90 e9 2e ff ff ff 90 0f 0b 90 e9 36 ff ff ff RSP: 0018:ffffc9000512f028 EFLAGS: 00000246 RAX: 0000000000000046 RBX: ffff888066233268 RCX: 0000000000000046 RDX: ffffffff95884630 RSI: ffffffff8d7a85e9 RDI: ffffffff8bc086e0 RBP: ffff888025cadb00 R08: ffffffff81ab3b98 R09: ffffffff8df41aa0 R10: dffffc0000000000 R11: ffffffff89635300 R12: 0000000000000000 R13: ffff888066233269 R14: 0000000000001000 R15: 0000000000000a87 __qdisc_destroy+0x166/0x400 net/sched/sch_generic.c:1079 taprio_destroy+0x263/0x550 net/sched/sch_taprio.c:2043 __qdisc_destroy+0x153/0x400 net/sched/sch_generic.c:1077 taprio_attach+0x25a/0x380 net/sched/sch_taprio.c:2161 qdisc_graft+0x1175/0x1590 net/sched/sch_api.c:1162 __tc_modify_qdisc net/sched/sch_api.c:1761 [inline] tc_modify_qdisc+0x16d3/0x2020 net/sched/sch_api.c:1817 rtnetlink_rcv_msg+0x77c/0xb70 net/core/rtnetlink.c:6967 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x820 net/socket.c:2592 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd66cd8f749 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:00007fd66db49038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd66cfe5fa0 RCX: 00007fd66cd8f749 RDX: 0000000000000000 RSI: 00002000000007c0 RDI: 0000000000000004 RBP: 00007fd66ce13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd66cfe6038 R14: 00007fd66cfe5fa0 R15: 00007ffcd769fa58 sched: DL replenish lagged too much