rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P23937
rcu: 	(detected by 0, t=10502 jiffies, g=114741, q=206 ncpus=2)
task:syz.7.4285      state:R  running task     stack:26688 pid:23937 tgid:23936 ppid:15322  task_flags:0x400140 flags:0x00080000
Call Trace:
 <IRQ>
 sched_show_task+0x4aa/0x5f0
 print_other_cpu_stall+0xfca/0x1380
 rcu_sched_clock_irq+0x939/0x1050
 update_process_times+0x234/0x2d0
 tick_nohz_handler+0x42b/0x770
 __hrtimer_run_queues+0x3bc/0xb10
 hrtimer_interrupt+0x455/0x950
 __sysvec_apic_timer_interrupt+0x102/0x430
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:rcu_is_watching+0x15/0xb0
Code: 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 65 ff 05 70 6d c6 10 e8 bb fd 7e 09 <89> c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 90
RSP: 0018:ffffc900080ef5d0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88811b6cc588 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8ba85b40 RDI: ffffffff8ba85b00
RBP: ffff88811b6cc000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f1597f R12: 0000000000000200
R13: ffffffff891463c2 R14: ffff88811b6cc5e0 R15: dffffc0000000000
 lock_release+0x4b/0x3c0
 rt_spin_unlock+0x29/0x200
 page_pool_put_unrefed_netmem+0x752/0xa10
 bpf_test_run_xdp_live+0xd6d/0x1cf0
 bpf_prog_test_run_xdp+0x81c/0x1160
 bpf_prog_test_run+0x2cd/0x340
 __sys_bpf+0x643/0x950
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0d844bcdd9
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:00007f0d8270e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f0d84735fa0 RCX: 00007f0d844bcdd9
RDX: 0000000000000050 RSI: 0000200000000900 RDI: 000000000000000a
RBP: 00007f0d84552d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d84736038 R14: 00007f0d84735fa0 R15: 00007fff8dd353f8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10442 jiffies! g114741 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=49550
rcu: rcu_preempt kthread starved for 10443 jiffies! g114741 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:25208 pid:18    tgid:18    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x16f9/0x5500
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11b0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:pv_native_safe_halt+0xf/0x20
Code: 6b 64 02 e9 83 cc 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 43 eb 20 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0000:ffffc900001e7e20 EFLAGS: 00000202
RAX: 00000000002be7fd RBX: ffffffff81997aaa RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8d62701a RDI: ffffffff8ba85b60
RBP: ffffc900001e7f10 R08: ffff88823c633d1b R09: 1ffff110478c67a3
R10: dffffc0000000000 R11: ffffed10478c67a4 R12: 0000000000000001
R13: 1ffff1102c096000 R14: 0000000000000001 R15: 1ffff1102c096000
FS:  0000000000000000(0000) GS:ffff8882a9f1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f51c887e9a2 CR3: 000000016c588000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 default_idle+0x9/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x36a/0x5f0
 cpu_startup_entry+0x43/0x60
 start_secondary+0x101/0x110
 common_startup_64+0x13e/0x157
 </TASK>
