rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=595c/1/0x4000000000000000 softirq=26041/26041 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=17933, q=86 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7937 Comm: syz.2.574 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:hrtimer_try_to_cancel+0x22b/0x420
Code: 2c 24 49 81 fd 00 db 15 8e 74 66 4c 89 eb 48 c1 eb 03 42 80 3c 33 00 74 08 4c 89 ef e8 ae 9c 75 00 49 8b 7d 00 e8 c5 53 cf 09 <49> 89 c7 48 8b 44 24 10 42 80 3c 30 00 74 08 4c 89 e7 e8 8e 9c 75
RSP: 0018:ffffc90000007928 EFLAGS: 00000046
RAX: 0000000000000802 RBX: 1ffff11009604f60 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000007800
RBP: 000000000019af42 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000000f00 R12: ffff8880249352d8
R13: ffff88804b027b00 R14: dffffc0000000000 R15: ffff88804b027b00
FS:  00007f024b3f26c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f024b3b0d58 CR3: 0000000043b76000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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:unwind_next_frame+0x7cd/0x2390
Code: 0f 84 d3 0d 00 00 48 83 c7 38 e8 0e 28 00 00 49 89 c4 48 8b 34 24 e9 a9 02 00 00 49 8d 5e 40 48 89 d8 48 c1 e8 03 80 3c 28 00 <74> 11 48 89 df e8 69 6b b0 00 48 8b 34 24 48 8b 54 24 08 4c 8b 23
RSP: 0018:ffffc9000483f4d8 EFLAGS: 00000246
RAX: 1ffff92000907ebd RBX: ffffc9000483f5e8 RCX: ffffffff8fbf7a64
RDX: ffffffff903f78e0 RSI: ffffffff903f78e4 RDI: ffffffff8be33e20
RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff8172d195
R10: ffffc9000483f5f8 R11: ffffffff81ac4d00 R12: ffffffff903f78e5
R13: ffffc9000483f5f8 R14: ffffc9000483f5a8 R15: ffffc9000483f5e0
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_node_noprof+0x234/0x3d0
 __get_vm_area_node+0x13f/0x300
 __vmalloc_node_range_noprof+0x301/0x12f0
 __vmalloc_noprof+0xb1/0xf0
 bpf_prog_alloc_no_stats+0x4a/0x4d0
 bpf_prog_alloc+0x3c/0x1a0
 __get_filter+0xff/0x400
 sk_attach_filter+0x24/0x140
 tun_attach_filter+0x180/0x2a0
 __tun_chr_ioctl+0x15d9/0x1df0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f024a58eba9
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:00007f024b3f2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f024a7d6090 RCX: 00007f024a58eba9
RDX: 0000200000000040 RSI: 00000000401054d5 RDI: 0000000000000004
RBP: 00007f024a611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f024a7d6128 R14: 00007f024a7d6090 R15: 00007ffe75a2e858
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g17933 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=5969
rcu: rcu_preempt kthread starved for 10502 jiffies! g17933 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>
