rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P7707
rcu: 	(detected by 1, t=10502 jiffies, g=18089, q=556 ncpus=2)
task:syz.5.467       state:R  running task     stack:23032 pid:7707  tgid:7706  ppid:6647   task_flags:0x400140 flags:0x00004008
Call Trace:
 <TASK>
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10498 jiffies! g18089 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=7038
rcu: rcu_preempt kthread starved for 10499 jiffies! g18089 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I 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: 7707 Comm: syz.5.467 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_acquire+0x334/0xd20
Code: 09 d5 09 cd 44 09 f5 41 89 6c c7 20 45 89 44 c7 24 4c 89 7c 24 10 4d 8d 34 c7 81 e5 ff 1f 00 00 48 0f a3 2d 3e 2d 0b 12 73 10 <48> 69 c5 c8 00 00 00 48 8d 80 10 a3 49 93 eb 40 83 3d a5 bc 0e 18
RSP: 0018:ffffc90000007750 EFLAGS: 00000003
RAX: 0000000000000005 RBX: ffff88804b027a98 RCX: 0000000000000067
RDX: 0000000000080000 RSI: 0000000000004000 RDI: ffff888122ba8000
RBP: 0000000000000067 R08: 0000000000000000 R09: ffffffff81ada78b
R10: dffffc0000000000 R11: ffffed1009604f51 R12: 0000000000004000
R13: 0000000000000000 R14: ffff888122ba8b18 R15: ffff888122ba8af0
FS:  00007f63cf8016c0(0000) GS:ffff8880b8612000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f63cf7e0d58 CR3: 00000001116b8000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_acquire+0x120/0x360
 _raw_spin_lock_irqsave+0xa7/0xf0
 hrtimer_try_to_cancel+0x22b/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:pskb_expand_head+0x2d/0x1150
Code: fa 55 41 57 41 56 41 55 41 54 53 48 81 ec 80 00 00 00 41 89 cc 89 d5 41 89 f6 48 89 fb 65 48 8b 05 38 52 44 09 48 89 44 24 78 <49> bf 00 00 00 00 00 fc ff df e8 64 33 63 f8 48 89 5c 24 20 48 8d
RSP: 0018:ffffc90006da7650 EFLAGS: 00000286
RAX: ab1a34a5dd731e00 RBX: ffff8880119b6900 RCX: 0000000000000820
RDX: 0000000000000000 RSI: 0000000000000040 RDI: ffff8880119b6900
RBP: 0000000000000000 R08: ffff888122ba8007 R09: 1ffff11024575000
R10: dffffc0000000000 R11: ffffffffa0000810 R12: 0000000000000820
R13: ffff8880119b69d8 R14: 0000000000000040 R15: 1ffff11002336d3b
 __bpf_skb_change_head+0x238/0x510
 bpf_skb_change_head+0x34/0x1b0
 bpf_prog_7cb64275891df360+0x5f/0x68
 bpf_test_run+0x318/0x7b0
 bpf_prog_test_run_skb+0xb4e/0x1550
 bpf_prog_test_run+0x2c7/0x340
 __sys_bpf+0x55a/0x850
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f63ce98ec29
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:00007f63cf801038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f63cebd5fa0 RCX: 00007f63ce98ec29
RDX: 0000000000000050 RSI: 0000200000001300 RDI: 000000000000000a
RBP: 00007f63cea11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f63cebd6038 R14: 00007f63cebd5fa0 R15: 00007ffe793585a8
 </TASK>
