rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=865c/0/0x3 softirq=18689/18697 fqs=1
rcu: 	(detected by 0, t=10502 jiffies, g=12561, q=310 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4868 [inline]
RIP: 0010:__lock_acquire+0x431/0xd20 kernel/locking/lockdep.c:5187
Code: 20 66 85 c0 0f 88 d6 01 00 00 0f b6 89 c5 00 00 00 84 c9 0f b6 d3 44 0f b6 e9 44 0f 44 ea 44 8b a7 e8 0a 00 00 41 8d 4c 24 ff <83> f9 ff bd ff ff ff ff 0f 4c e9 ff c5 45 8d 7c 24 01 49 ff cc 44
RSP: 0018:ffffc90000a08650 EFLAGS: 00000046
RAX: 00000000000c6961 RBX: 0000000000000003 RCX: 00000000ffffffff
RDX: 0000000000000003 RSI: 0000000000006000 RDI: ffff88801ceb5a00
RBP: 0000000000000961 R08: 0000000000000000 R09: ffffffff899b7d14
R10: dffffc0000000000 R11: ffffffff899b7c50 R12: 0000000000000000
R13: 0000000000000003 R14: ffff88801ceb64f0 R15: ffff88801ceb64f0
FS:  0000000000000000(0000) GS:ffff888125d16000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000600 CR3: 000000007a820000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0xc4/0xc90 net/sched/sch_taprio.c:929
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1050
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 cb 89 4a f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> e3 2e 13 f6 65 8b 05 6c c1 23 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90000a08be0 EFLAGS: 00000206
RAX: f3ce523260da0200 RBX: 0000000000000a02 RCX: f3ce523260da0200
RDX: 0000000000000000 RSI: ffffffff8d9b9907 RDI: 0000000000000001
RBP: ffffc90000a08c60 R08: ffffffff8fa38837 R09: 1ffffffff1f47106
R10: dffffc0000000000 R11: fffffbfff1f47107 R12: dffffc0000000000
R13: ffff8880252eed50 R14: ffff8880252eed00 R15: 1ffff9200014117c
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 flush_end_io+0xc19/0xe60 block/blk-flush.c:-1
 __blk_mq_end_request+0x46a/0x630 block/blk-mq.c:1141
 scsi_end_request+0x4b3/0x830 drivers/scsi/scsi_lib.c:670
 scsi_io_completion+0x131/0x390 drivers/scsi/scsi_lib.c:1078
 blk_complete_reqs block/blk-mq.c:1226 [inline]
 blk_done_softirq+0x10a/0x160 block/blk-mq.c:1231
 handle_softirqs+0x283/0x870 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
 common_interrupt+0xbb/0xe0 arch/x86/kernel/irq.c:318
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: 53 e8 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d b3 e9 0d 00 f3 0f 1e fa fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c2
RAX: f3ce523260da0200 RBX: ffffffff819693f8 RCX: f3ce523260da0200
RDX: 0000000000000001 RSI: ffffffff8d9b9907 RDI: ffffffff8be33c00
RBP: ffffc90000197f20 R08: ffff8880b8732f9b R09: 1ffff110170e65f3
R10: dffffc0000000000 R11: ffffed10170e65f4 R12: ffffffff8fa38830
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff110039d6b40
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:757
 default_idle_call+0x74/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:190 [inline]
 do_idle+0x1e8/0x510 kernel/sched/idle.c:330
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:315
 common_startup_64+0x13e/0x147
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g12561 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=6051
rcu: rcu_preempt kthread starved for 10500 jiffies! g12561 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:27160 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>