rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10500 ticks this GP) idle=3284/1/0x4000000000000000 softirq=81886/81886 fqs=0
rcu: 	(t=10500 jiffies g=71645 q=6639 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g71645 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=38083
rcu: rcu_preempt kthread starved for 10500 jiffies! g71645 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:26664 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6878
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
CPU: 0 UID: 0 PID: 3 Comm: pool_workqueue_ Not tainted 6.16.0-rc1-syzkaller-00010-g2c4a1f3fe03e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x90 kernel/kcov.c:287
Code: 7c 11 10 48 89 74 11 18 48 89 44 11 20 e9 08 69 a8 09 cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 14 25 08 e0 9c 92 65 8b 0d 68 7f
RSP: 0018:ffffc90000007b40 EFLAGS: 00000212
RAX: 0000000000000000 RBX: 0000000000000010 RCX: ffff8881404f3c00
RDX: 0000000000000100 RSI: 0000000000000010 RDI: 000000000000000a
RBP: 1ffff1100f747072 R08: 0000000000000000 R09: ffffffff8984f816
R10: 0000000000000001 R11: ffffffff89786710 R12: dffffc0000000000
R13: ffff88807ba38390 R14: 000000000000000a R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff888125c52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30a11ff8 CR3: 000000000df38000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 taprio_next_tc_txq net/sched/sch_taprio.c:763 [inline]
 taprio_dequeue_tc_priority+0x20c/0x750 net/sched/sch_taprio.c:790
 taprio_dequeue+0x186/0x550 net/sched/sch_taprio.c:-1
 dequeue_skb net/sched/sch_generic.c:294 [inline]
 qdisc_restart net/sched/sch_generic.c:399 [inline]
 __qdisc_run+0x239/0x15f0 net/sched/sch_generic.c:417
 qdisc_run+0xc2/0x230 include/net/pkt_sched.h:127
 net_tx_action+0x7c9/0x980 net/core/dev.c:5624
 handle_softirqs+0x286/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lockdep_unregister_key+0x2c5/0x310 kernel/locking/lockdep.c:6619
Code: 65 48 8b 05 0d 86 fe 10 48 3b 44 24 10 0f 84 26 fe ff ff e8 bd 9d c7 09 e8 e8 9e c7 09 41 f7 c7 00 02 00 00 74 bd fb 40 84 ed <75> bc eb cd 90 0f 0b 90 e9 19 ff ff ff 90 0f 0b 90 e9 2a ff ff ff
RSP: 0018:ffffc90000087c00 EFLAGS: 00000246
RAX: b1a19cd34f35f400 RBX: ffff88807a9c8938 RCX: b1a19cd34f35f400
RDX: ffffffff9360a358 RSI: ffffffff8d994afa RDI: ffffffff8be28300
RBP: ffff88807a9c8900 R08: 0000000000000000 R09: ffffffff81ab4428
R10: dffffc0000000000 R11: fffffbfff1f4211f R12: 0000000000000000
R13: 0000000000001000 R14: 0000000000000001 R15: 0000000000000202
 wq_unregister_lockdep kernel/workqueue.c:4818 [inline]
 pwq_release_workfn+0x6d5/0x870 kernel/workqueue.c:5114
 kthread_worker_fn+0x504/0xb60 kernel/kthread.c:1010
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
sched: DL replenish lagged too much