rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (2 ticks this GP) idle=ebf4/1/0x4000000000000000 softirq=90675/90675 fqs=79
rcu: 	(detected by 1, t=10502 jiffies, g=98921, q=478 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10062 Comm: syz.0.1231 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:lock_acquire+0x14f/0x350 kernel/locking/lockdep.c:5872
Code: 01 0f 85 ae 00 00 00 9c 58 a9 00 02 00 00 0f 85 c1 00 00 00 f7 44 24 08 00 02 00 00 0f 85 c6 00 00 00 65 48 8b 05 d1 5d 9a 11 <48> 3b 44 24 58 0f 84 c3 00 00 00 e9 f0 00 00 00 65 8b 05 8a a2 9a
RSP: 0000:ffffc90000007c60 EFLAGS: 00000046
RAX: 44b7b7728b657700 RBX: 0000000000000000 RCX: 0000000000010002
RDX: 0000000000000000 RSI: ffffffff8c293c00 RDI: ffffffff8c293bc0
RBP: ffffffff89bb67e2 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff89bb6720 R12: 0000000000000000
R13: ffff8880788182c0 R14: 0000000000000000 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88812525d000(0063) knlGS:00000000f53d6b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000080076018 CR3: 000000006567c000 CR4: 00000000003526f0
DR0: 0000000000000009 DR1: 00000000000000c9 DR2: 00000000000000f3
DR3: 00000000000000c0 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158
 spin_lock include/linux/spinlock.h:342 [inline]
 advance_sched+0xc2/0xc80 net/sched/sch_taprio.c:930
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__io_cqring_overflow_flush+0x49/0x9a0 io_uring/io_uring.c:526
Code: 44 24 20 49 bd 00 00 00 00 00 fc ff df e8 0f ed 1c fd 48 c7 c0 00 bc 31 90 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 79 08 00 00 <8b> 2d b1 87 88 0b 31 ff 89 ee e8 28 f1 1c fd 85 ed 74 2e 48 8d bb
RSP: 0000:ffffc90006257a08 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88802bc5e000 RCX: ffff888057185d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88802bc5e000
RBP: ffffc90006257cf0 R08: ffffffff903188f7 R09: 1ffffffff206311e
R10: dffffc0000000000 R11: fffffbfff206311f R12: ffff88802bc5e318
R13: dffffc0000000000 R14: ffff88802bc5e040 R15: dffffc0000000000
 io_cqring_do_overflow_flush+0x27/0x40 io_uring/io_uring.c:590
 io_cqring_wait+0x13af/0x2050 io_uring/wait.c:296
 __do_sys_io_uring_enter io_uring/io_uring.c:2685 [inline]
 __se_sys_io_uring_enter+0x176c/0x1bb0 io_uring/io_uring.c:2595
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x23e/0x6f0 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f170ec
Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8
RSP: 002b:00000000f53d650c EFLAGS: 00000206 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000002cbe
RDX: 0000000000007f66 RSI: 0000000000000013 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 9778 jiffies! g98921 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:28408 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7322
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 9c 7b 02 c3 cc cc cc cc 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 03 48 1c 00 fb f4 <e9> 7c 03 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc90000197e40 EFLAGS: 00000246
RAX: ffff88812535d000 RBX: ffffffff819a612c RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8c293c00 RDI: ffffffff819a612c
RBP: ffffc90000197f10 R08: ffff8880b87338db R09: 1ffff110170e671b
R10: dffffc0000000000 R11: ffffed10170e671c R12: 0000000000000000
R13: 1ffff11003b5f000 R14: 1ffff92000032fd0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88812535d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555589c73008 CR3: 00000000771d0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:766 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x1cc/0x540 kernel/sched/idle.c:355
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x157
 </TASK>