rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7524
rcu: 	(detected by 1, t=10502 jiffies, g=20277, q=855 ncpus=2)
task:syz.2.732       state:R  running task     stack:26688 pid:7524  tgid:7521  ppid:5609   task_flags:0x400140 flags:0x00080000
Call Trace:
 <IRQ>
 sched_show_task+0x4aa/0x5f0 kernel/sched/core.c:8148
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
 print_other_cpu_stall+0xfca/0x1380 kernel/rcu/tree_stall.h:681
 check_cpu_stall kernel/rcu/tree_stall.h:856 [inline]
 rcu_pending kernel/rcu/tree.c:3679 [inline]
 rcu_sched_clock_irq+0x939/0x1050 kernel/rcu/tree.c:2716
 update_process_times+0x234/0x2d0 kernel/time/timer.c:2475
 tick_sched_handle kernel/time/tick-sched.c:298 [inline]
 tick_nohz_handler+0x42b/0x770 kernel/time/tick-sched.c:319
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x3bc/0xb10 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x455/0x950 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:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5874
Code: ff ff ff e8 f1 1d 88 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 cb a8 cf 10 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 18 98 ed
RSP: 0018:ffffc9001d0cf580 EFLAGS: 00000282
RAX: c5a0e9834ded8900 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000be83f900 RSI: ffffffff8d88874d RDI: ffffffff8ba85b60
RBP: ffffffff8914617c R08: ffffffff8914617c R09: ffff88803f8985e0
R10: dffffc0000000000 R11: fffff940001a95a7 R12: 0000000000000000
R13: ffff88803f8985e0 R14: 0000000000000001 R15: 0000000000000246
 rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
 page_pool_producer_lock include/linux/bottom_half.h:-1 [inline]
 page_pool_recycle_in_ring net/core/page_pool.c:810 [inline]
 page_pool_put_unrefed_netmem+0x5cc/0xa10 net/core/page_pool.c:932
 xdp_test_run_batch net/bpf/test_run.c:341 [inline]
 bpf_test_run_xdp_live+0xd6d/0x1cf0 net/bpf/test_run.c:379
 bpf_prog_test_run_xdp+0x81c/0x1160 net/bpf/test_run.c:1465
 bpf_prog_test_run+0x2cd/0x340 kernel/bpf/syscall.c:4747
 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6271
 __do_sys_bpf kernel/bpf/syscall.c:6366 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6364 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6364
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa7b4b3cdd9
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:00007fa7b2d8e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa7b4db5fa0 RCX: 00007fa7b4b3cdd9
RDX: 0000000000000050 RSI: 0000200000000900 RDI: 000000000000000a
RBP: 00007fa7b4bd2d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa7b4db6038 R14: 00007fa7b4db5fa0 R15: 00007ffdb05d77f8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10451 jiffies! g20277 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=10756
rcu: rcu_preempt kthread starved for 10452 jiffies! g20277 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:27736 pid:18    tgid:18    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16f9/0x5500 kernel/sched/core.c:7197
 __schedule_loop kernel/sched/core.c:7276 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7291
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11b0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 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: 7524 Comm: syz.2.732 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5874
Code: ff ff ff e8 f1 1d 88 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 cb a8 cf 10 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d 18 98 ed
RSP: 0018:ffffc9001d0cf580 EFLAGS: 00000282
RAX: c5a0e9834ded8900 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 00000000be83f900 RSI: ffffffff8d88874d RDI: ffffffff8ba85b60
RBP: ffffffff8914617c R08: ffffffff8914617c R09: ffff88803f8985e0
R10: dffffc0000000000 R11: fffff940001a95a7 R12: 0000000000000000
R13: ffff88803f8985e0 R14: 0000000000000001 R15: 0000000000000246
FS:  00007fa7b2d8e6c0(0000) GS:ffff88812601f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd614a44878 CR3: 0000000036b24000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 rt_spin_lock+0x83/0x400 kernel/locking/spinlock_rt.c:56
 page_pool_producer_lock include/linux/bottom_half.h:-1 [inline]
 page_pool_recycle_in_ring net/core/page_pool.c:810 [inline]
 page_pool_put_unrefed_netmem+0x5cc/0xa10 net/core/page_pool.c:932
 xdp_test_run_batch net/bpf/test_run.c:341 [inline]
 bpf_test_run_xdp_live+0xd6d/0x1cf0 net/bpf/test_run.c:379
 bpf_prog_test_run_xdp+0x81c/0x1160 net/bpf/test_run.c:1465
 bpf_prog_test_run+0x2cd/0x340 kernel/bpf/syscall.c:4747
 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6271
 __do_sys_bpf kernel/bpf/syscall.c:6366 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6364 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6364
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa7b4b3cdd9
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:00007fa7b2d8e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa7b4db5fa0 RCX: 00007fa7b4b3cdd9
RDX: 0000000000000050 RSI: 0000200000000900 RDI: 000000000000000a
RBP: 00007fa7b4bd2d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa7b4db6038 R14: 00007fa7b4db5fa0 R15: 00007ffdb05d77f8
 </TASK>