rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (3 ticks this GP) idle=295/1/0x4000000000000000 softirq=10922/10922 fqs=0 
	(detected by 0, t=11079 jiffies, g=12009, q=1487)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4233 Comm: kworker/u5:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: hci5 hci_power_on
RIP: 0010:check_wait_context kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:__lock_acquire+0x885/0x7d10 kernel/locking/lockdep.c:4962
Code: 98 00 00 00 75 24 48 8b 84 24 c0 00 00 00 42 0f b6 04 00 84 c0 0f 85 d8 64 00 00 41 83 3f 00 41 0f 94 c5 45 00 ed 41 80 c5 02 <48> 8b 84 24 88 00 00 00 42 0f b6 04 00 84 c0 0f 85 35 62 00 00 44
RSP: 0018:ffffc90000dd08e0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff888072b98ae8 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901d40c0
RBP: ffffc90000dd0b30 R08: dffffc0000000000 R09: 1ffffffff203a818
R10: dffffc0000000000 R11: fffffbfff203a819 R12: 0000000000000000
R13: ffff888072b98b02 R14: 0000000000000001 R15: ffff888072b98ad4
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb78d33aff8 CR3: 0000000074cdb000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
 rcu_read_lock include/linux/rcupdate.h:740 [inline]
 advance_sched+0x6ca/0x940 net/sched/sch_taprio.c:769
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4f2/0xb70 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:lock_acquire+0x208/0x400 kernel/locking/lockdep.c:5627
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 04 f8 0f 85 f1 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 43 c7 44 3d 08 00 00 00 00 65 48 8b 04
RSP: 0018:ffffc9000348fb20 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: fb2708eea951c700
RDX: ffffffff8fd43fe0 RSI: ffffffff8a2b3a20 RDI: ffffffff8a79f980
RBP: ffffc9000348fc28 R08: dffffc0000000000 R09: 0000000000021c95
R10: 1ffffffff2058c10 R11: fffffbfff1fa39d4 R12: ffff888057f43138
R13: 1ffff92000691f70 R14: 0000000000000246 R15: dffffc0000000000
 process_one_work+0x79b/0x1010 kernel/workqueue.c:2285
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 11078 jiffies! g12009 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=3526
rcu: rcu_preempt kthread starved for 11079 jiffies! g12009 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:27800 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4233 Comm: kworker/u5:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: hci5 hci_power_on
RIP: 0010:arch_atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline]
RIP: 0010:atomic64_read include/linux/atomic/atomic-instrumented.h:606 [inline]
RIP: 0010:taprio_set_budget net/sched/sch_taprio.c:556 [inline]
RIP: 0010:advance_sched+0x613/0x940 net/sched/sch_taprio.c:761
Code: 8b 44 24 28 8b 00 4c 69 e8 e8 03 00 00 4c 8d 65 a0 4c 89 e7 be 08 00 00 00 e8 49 58 a7 f9 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 <4c> 8b 74 24 50 74 08 4c 89 e7 e8 9e 56 a7 f9 4c 89 e8 31 d2 49 f7
RSP: 0018:ffffc90000dd0ca0 EFLAGS: 00000046
RAX: 1ffff1100f74505c RBX: ffff88805b8db220 RCX: ffffffff8816d5b7
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88807ba282e0
RBP: ffff88807ba28340 R08: ffff88807ba282e7 R09: 1ffff1100f74505c
R10: dffffc0000000000 R11: ffffed100f74505d R12: ffff88807ba282e0
R13: 0000000000319750 R14: dffffc0000000000 R15: 0000002bcd5e2876
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb78d33aff8 CR3: 0000000074cdb000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4f2/0xb70 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:lock_acquire+0x208/0x400 kernel/locking/lockdep.c:5627
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 04 f8 0f 85 f1 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 43 c7 44 3d 08 00 00 00 00 65 48 8b 04
RSP: 0018:ffffc9000348fb20 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: fb2708eea951c700
RDX: ffffffff8fd43fe0 RSI: ffffffff8a2b3a20 RDI: ffffffff8a79f980
RBP: ffffc9000348fc28 R08: dffffc0000000000 R09: 0000000000021c95
R10: 1ffffffff2058c10 R11: fffffbfff1fa39d4 R12: ffff888057f43138
R13: 1ffff92000691f70 R14: 0000000000000246 R15: dffffc0000000000
 process_one_work+0x79b/0x1010 kernel/workqueue.c:2285
 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>