rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=820c/1/0x4000000000000000 softirq=172877/172878 fqs=5229 rcu: hardirqs softirqs csw/system rcu: number: 6030 0 0 rcu: cputime: 141 52347 3 ==> 52490(ms) rcu: (t=10500 jiffies g=119057 q=2285 ncpus=2) CPU: 0 UID: 0 PID: 24297 Comm: syz.1.4720 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:taprio_dequeue_from_txq+0x14d/0x980 net/sched/sch_taprio.c:726 Code: 00 48 89 6c 24 18 4c 89 f3 4d 8d 7e 18 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 da c5 c4 f8 4d 8b 3f 49 83 c7 38 <4c> 89 f8 48 c1 e8 03 42 80 3c 20 00 48 8b 6c 24 28 74 08 4c 89 ff RSP: 0018:ffffc90000007ad8 EFLAGS: 00000286 RAX: 1ffff1100ae7e203 RBX: ffff8880573f1000 RCX: 0000000000000100 RDX: ffff88802d741e40 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000002 R08: 0000000000000000 R09: ffffffff89605286 R10: 0000000000000001 R11: ffffffff89538e90 R12: dffffc0000000000 R13: ffff888048184000 R14: ffff8880573f1000 R15: ffffffff8f7d9b78 FS: 00007f345104a6c0(0000) GS:ffff888126132000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000bfa000 CR3: 0000000053eca000 CR4: 00000000003526f0 Call Trace: 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/0x1540 net/sched/sch_generic.c:420 qdisc_run+0xc7/0x300 include/net/pkt_sched.h:120 net_tx_action+0x7c9/0xa10 net/core/dev.c:5781 handle_softirqs+0x286/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:htab_unlock_bucket+0x23a/0x2e0 kernel/bpf/hashtab.c:162 Code: dd ff e8 b9 2e 51 ff e9 74 ff ff ff e8 4f fa dd ff e8 9a f8 65 09 48 85 db 74 c7 e8 40 fa dd ff fb 48 c7 44 24 20 0e 36 e0 45 <48> 8b 44 24 18 4a c7 04 20 00 00 00 00 65 48 8b 05 81 d6 8c 10 48 RSP: 0018:ffffc9000df579a0 EFLAGS: 00000246 RAX: ffffffff81e20980 RBX: 0000000000000200 RCX: 0000000000080000 RDX: ffffc9001c1f2000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc9000df57a60 R08: ffffffff8f7d1477 R09: 1ffffffff1efa28e R10: dffffc0000000000 R11: fffffbfff1efa28f R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880b883b4c8 htab_map_update_elem_in_place+0x2e9/0x5b0 kernel/bpf/hashtab.c:1319 bpf_percpu_hash_update+0x13d/0x200 kernel/bpf/hashtab.c:2414 bpf_map_update_value+0x45b/0x920 kernel/bpf/syscall.c:270 generic_map_update_batch+0x5bf/0x7f0 kernel/bpf/syscall.c:2045 bpf_map_do_batch+0x39b/0x630 kernel/bpf/syscall.c:5633 __sys_bpf+0x690/0x860 kernel/bpf/syscall.c:-1 __do_sys_bpf kernel/bpf/syscall.c:6260 [inline] __se_sys_bpf kernel/bpf/syscall.c:6258 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6258 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f345018f749 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:00007f345104a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f34503e5fa0 RCX: 00007f345018f749 RDX: 0000000000000038 RSI: 0000200000000000 RDI: 000000000000001a RBP: 00007f3450213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f34503e6038 R14: 00007f34503e5fa0 R15: 00007ffd2de7d378 sched: DL replenish lagged too much