rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=8474/1/0x4000000000000000 softirq=181739/181740 fqs=5237
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     7777          0            0
rcu: 	cputime:      178      52311            5   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=170533 q=2746 ncpus=2)
CPU: 0 UID: 0 PID: 455 Comm: syz.1.7017 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+0x154/0x980 net/sched/sch_taprio.c:726
Code: 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 9e b6 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 e8 b8 9e b6 f8 4d 8b
RSP: 0018:ffffc90000007c70 EFLAGS: 00000a02
RAX: 1ffffffff1f05567 RBX: ffff888033198000 RCX: 0000000000000100
RDX: ffff888039fa5b80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff896fcc56 R09: ffffffff8df41aa0
R10: 0000000000000001 R11: ffffffff89631050 R12: dffffc0000000000
R13: ffff888033e80000 R14: ffff888033198000 R15: ffffffff8f82ab38
FS:  0000000000000000(0000) GS:ffff888125e1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c34010b CR3: 000000000dd3a000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 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:5782
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:_compound_head include/linux/page-flags.h:286 [inline]
RIP: 0010:free_pages_and_swap_cache+0x14b/0x520 mm/swap_state.c:346
Code: 89 44 24 10 4c 8d 70 08 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 f7 e8 48 c9 08 00 4d 8b 36 <4c> 89 f6 48 83 e6 01 31 ff e8 e7 ad a2 ff 4c 89 f0 48 83 e0 01 0f
RSP: 0018:ffffc9001b7df560 EFLAGS: 00000246
RAX: 1ffffd40003ff421 RBX: ffff888033f2eda8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000001f
RBP: ffffc9001b7df7e8 R08: ffffea0001ffa0c7 R09: 1ffffd40003ff418
R10: dffffc0000000000 R11: fffff940003ff419 R12: 1ffff110067e5db5
R13: ffffea0001ffa100 R14: ffffea0001ffa0c8 R15: 00000000000001b3
 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu+0x3a0/0x680 mm/mmu_gather.c:404
 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497
 exit_mmap+0x439/0xb10 mm/mmap.c:1290
 __mmput+0x118/0x430 kernel/fork.c:1173
 exit_mm+0x169/0x230 kernel/exit.c:581
 do_exit+0x627/0x22f0 kernel/exit.c:959
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4e0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9667b8f749
Code: Unable to access opcode bytes at 0x7f9667b8f71f.
RSP: 002b:00007f966897d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: 0000000000000001 RBX: 00007f9667de5fa0 RCX: 00007f9667b8f749
RDX: 0492492492492627 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f9667c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 4000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9667de6038 R14: 00007f9667de5fa0 R15: 00007ffe42ddcdd8
 </TASK>
sched: DL replenish lagged too much