rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10503 jiffies, g=9785, q=342 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294955204-4294944701), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g9785 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=3318
rcu: rcu_preempt kthread starved for 10503 jiffies! g9785 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->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 stack:27160 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </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: 6624 Comm: syz.1.220 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:lock_release+0xf1/0x3e0
Code: 01 00 00 00 83 3d 2e 5a 06 0e 00 0f 84 96 01 00 00 41 8b 87 e8 0a 00 00 85 c0 0f 84 1d 01 00 00 4c 89 6c 24 18 48 89 5c 24 08 <44> 8d 60 ff 49 8d af f0 0a 00 00 4d 63 ec 48 89 04 24 83 f8 32 0f
RSP: 0018:ffffc90000007818 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000087 RCX: ea5140dd00ed3b00
RDX: 0000000000010000 RSI: ffffffff8d9cde26 RDI: ffffffff8be33e80
RBP: ffffc90000007918 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f00 R12: dffffc0000000000
R13: ffffffff81ada91e R14: ffff88804b027a98 R15: ffff8881072b5640
FS:  00007f3184ba76c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2ded84f5c0 CR3: 00000000391ca000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 _raw_spin_unlock_irqrestore+0x70/0x110
 hrtimer_try_to_cancel+0x3be/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:___slab_alloc+0xa3e/0x1420
Code: 24 60 00 00 00 00 9c 8f 44 24 60 f7 44 24 60 00 02 00 00 0f 85 68 08 00 00 f7 c5 00 02 00 00 74 01 fb 65 48 8b 05 22 09 88 10 <48> 3b 44 24 68 0f 85 b3 08 00 00 4c 89 f8 48 83 c4 70 5b 41 5c 41
RSP: 0018:ffffc900068c7a38 EFLAGS: 00000206
RAX: ea5140dd00ed3b00 RBX: ffff88804b03e700 RCX: ea5140dd00ed3b00
RDX: 0000000000000000 RSI: ffffffff8d9ba2f8 RDI: ffffffff8be33e80
RBP: 0000000000000286 R08: ffffffff8fa3aa37 R09: 1ffffffff1f47546
R10: dffffc0000000000 R11: fffffbfff1f47547 R12: ffff88804b03e700
R13: ffff88801a442140 R14: 0000000000000000 R15: ffff88802809e000
 __kmalloc_noprof+0x305/0x4f0
 bpf_test_init+0x9f/0x150
 bpf_prog_test_run_xdp+0x370/0xfd0
 bpf_prog_test_run+0x2c7/0x340
 __sys_bpf+0x581/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3183d8eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3184ba7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f3183fd5fa0 RCX: 00007f3183d8eba9
RDX: 0000000000000037 RSI: 0000200000000640 RDI: 000000000000000a
RBP: 00007f3183e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3183fd6038 R14: 00007f3183fd5fa0 R15: 00007ffff57523c8
 </TASK>
