rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8200
rcu: 	(detected by 1, t=10502 jiffies, g=23237, q=845 ncpus=2)
task:syz.1.898       state:R  running task     stack:26688 pid:8200  tgid:8199  ppid:5826   task_flags:0x400140 flags:0x00080000
Call Trace:
 <IRQ>
 sched_show_task+0x4aa/0x5f0 kernel/sched/core.c:8139
 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:1930 [inline]
 __hrtimer_run_queues+0x3bc/0xb10 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x455/0x950 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 6d 80 66 f6 f7 c3 00 02 00 00 74 05 e8 30 33 92 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 24 10 59 f6 65 8b 05 bd 12 3c 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc9001ce27568 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000080000001
RDX: 0000000000000003 RSI: ffffffff8d652953 RDI: 0000000000000001
RBP: ffffc9001ce27680 R08: ffffffff8f8d54f7 R09: 1ffffffff1f1aa9e
R10: dffffc0000000000 R11: fffffbfff1f1aa9f R12: dffffc0000000000
R13: 1ffff920039c4eb8 R14: ffff888067752588 R15: ffff888067752588
 unlock_rt_mutex_safe kernel/locking/rtmutex.c:350 [inline]
 rt_mutex_slowunlock+0x4a7/0x8b0 kernel/locking/rtmutex.c:1463
 page_pool_producer_unlock include/linux/ptr_ring.h:-1 [inline]
 page_pool_recycle_in_ring net/core/page_pool.c:809 [inline]
 page_pool_put_unrefed_netmem+0x741/0xa20 net/core/page_pool.c:927
 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:1430
 bpf_prog_test_run+0x2cd/0x340 kernel/bpf/syscall.c:4742
 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6266
 __do_sys_bpf kernel/bpf/syscall.c:6361 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6359 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6359
 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: 0033:0x7fc95af7c819
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:00007fc9591d6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fc95b1f5fa0 RCX: 00007fc95af7c819
RDX: 0000000000000050 RSI: 0000200000000b80 RDI: 000000000000000a
RBP: 00007fc95b012c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc95b1f6038 R14: 00007fc95b1f5fa0 R15: 00007ffe775ea6b8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10450 jiffies! g23237 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=14655
rcu: rcu_preempt kthread starved for 10451 jiffies! g23237 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:27768 pid:18    tgid:18    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5387 [inline]
 __schedule+0x169e/0x54f0 kernel/sched/core.c:7188
 __schedule_loop kernel/sched/core.c:7267 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7282
 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: 8200 Comm: syz.1.898 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 6d 80 66 f6 f7 c3 00 02 00 00 74 05 e8 30 33 92 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 24 10 59 f6 65 8b 05 bd 12 3c 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc9001ce27568 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000080000001
RDX: 0000000000000003 RSI: ffffffff8d652953 RDI: 0000000000000001
RBP: ffffc9001ce27680 R08: ffffffff8f8d54f7 R09: 1ffffffff1f1aa9e
R10: dffffc0000000000 R11: fffffbfff1f1aa9f R12: dffffc0000000000
R13: 1ffff920039c4eb8 R14: ffff888067752588 R15: ffff888067752588
FS:  00007fc9591d66c0(0000) GS:ffff888125fb4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efcb4457f74 CR3: 0000000037ec2000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 unlock_rt_mutex_safe kernel/locking/rtmutex.c:350 [inline]
 rt_mutex_slowunlock+0x4a7/0x8b0 kernel/locking/rtmutex.c:1463
 page_pool_producer_unlock include/linux/ptr_ring.h:-1 [inline]
 page_pool_recycle_in_ring net/core/page_pool.c:809 [inline]
 page_pool_put_unrefed_netmem+0x741/0xa20 net/core/page_pool.c:927
 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:1430
 bpf_prog_test_run+0x2cd/0x340 kernel/bpf/syscall.c:4742
 __sys_bpf+0x643/0x950 kernel/bpf/syscall.c:6266
 __do_sys_bpf kernel/bpf/syscall.c:6361 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6359 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6359
 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: 0033:0x7fc95af7c819
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:00007fc9591d6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fc95b1f5fa0 RCX: 00007fc95af7c819
RDX: 0000000000000050 RSI: 0000200000000b80 RDI: 000000000000000a
RBP: 00007fc95b012c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc95b1f6038 R14: 00007fc95b1f5fa0 R15: 00007ffe775ea6b8
 </TASK>