rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=81177, q=234 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295006212-4294995710), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g81177 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:28656 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7322
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 13438 Comm: syz.3.2114 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:advance_sched+0x106/0xd20 net/sched/sch_taprio.c:931
Code: 89 44 24 40 e8 ab 65 f4 01 e8 76 75 f1 01 31 ff 89 c5 89 c6 e8 6b 3e 67 f8 85 ed 0f 85 b2 07 00 00 e8 ae 43 67 f8 48 8b 04 24 <48> 83 e8 18 48 89 c2 48 89 44 24 38 48 b8 00 00 00 00 00 fc ff df
RSP: 0018:ffffc90000007de8 EFLAGS: 00000046
RAX: ffff888077265300 RBX: ffff888077265300 RCX: ffffffff89a22ca5
RDX: ffff8880344e0000 RSI: ffffffff89a22cb2 RDI: ffff8880344e0000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: ffffc90000007ff8 R12: ffff888077265300
R13: ffffffff89a22bb0 R14: ffff8880b8428640 R15: ffff8880b8428690
FS:  00007ff7ee7ed6c0(0000) GS:ffff888124332000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff7eda4f270 CR3: 00000000276a7000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x9e/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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 46 71 4e f6 48 89 df e8 ce c0 4e f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 15 cf 3d f6 65 8b 05 1e 49 78 08 85 c0 74 16 5b
RSP: 0018:ffffc90005d57ad8 EFLAGS: 00000246
RAX: 0000000000000046 RBX: ffff888052c30a78 RCX: ffffffff8211b23f
RDX: 0000000000000000 RSI: ffffffff8c1cef00 RDI: ffffffff8b969722
RBP: 0000000000000206 R08: 0000000000000000 R09: fffffbfff21b3292
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880b853b340
R13: ffff8880b853c220 R14: ffff888052c30a78 R15: ffff888052c30000
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:571 [inline]
 try_to_wake_up+0xd8d/0x1c90 kernel/sched/core.c:4292
 wake_up_process kernel/sched/core.c:4547 [inline]
 wake_up_q+0xa1/0x130 kernel/sched/core.c:1173
 futex_wake+0x4f4/0x5e0 kernel/futex/waitwake.c:225
 do_futex+0x2b2/0x440 kernel/futex/syscalls.c:138
 __do_sys_futex kernel/futex/syscalls.c:210 [inline]
 __se_sys_futex kernel/futex/syscalls.c:191 [inline]
 __x64_sys_futex+0x34f/0x4d0 kernel/futex/syscalls.c:191
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff7ed99ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff7ee7ed0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007ff7edc15fa8 RCX: 00007ff7ed99ce59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007ff7edc15fac
RBP: 00007ff7edc15fa0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff7edc16038 R14: 00007ffc6a0ec8b0 R15: 00007ffc6a0ec998
 </TASK>