rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=87545, q=268133 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295007618-4294997116), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g87545 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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  running task     stack:27656 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 24731 Comm: syz.9.5545 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:mark_lock+0x2f/0x190
Code: 41 55 41 54 53 8b 46 20 89 c1 81 e1 00 00 03 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08 0f 45 da bd 01 00 00 00 89 d9 d3 e5 <25> ff 1f 00 00 48 0f a3 05 74 5a 82 12 73 10 48 69 c0 c8 00 00 00
RSP: 0000:ffffc90000007260 EFLAGS: 00000002
RAX: 00000000000c606a RBX: 0000000000000004 RCX: 0000000000000004
RDX: 0000000000000004 RSI: ffff888106f54628 RDI: ffff888106f53a80
RBP: 0000000000000010 R08: ffffffff81b267fa R09: ffff888121028298
R10: dffffc0000000000 R11: ffffffff81b26700 R12: 0000000000000002
R13: ffff888106f54628 R14: ffff888106f53a80 R15: 0000000000000001
FS:  00007f9d765b96c0(0000) GS:ffff88818de5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000b000c000a CR3: 00000001128fa000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __lock_acquire+0x689/0x2cf0
 lock_acquire+0xf0/0x2e0
 _raw_spin_lock_irqsave+0x40/0x60
 hrtimer_interrupt+0xfa/0x1010
 __sysvec_apic_timer_interrupt+0x102/0x460
 sysvec_apic_timer_interrupt+0x52/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__read_once_word_nocheck+0x3/0x10
Code: 00 48 ba 00 00 00 00 00 fc ff df e9 88 fc ff ff 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 07 <e9> 98 0a 3b 0a cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0000:ffffc90000007698 EFLAGS: 00000202
RAX: ffffc90000007950 RBX: ffffc90000000000 RCX: 0000000000000001
RDX: ffffc90000007868 RSI: dffffc0000000000 RDI: ffffc900000078b0
RBP: 1ffff92000000f05 R08: ffffc900000078b0 R09: 0000000000000000
R10: ffffc90000007878 R11: fffff52000000f11 R12: 1ffff92000000f06
R13: 1ffff92000000f07 R14: ffffc90000008000 R15: dffffc0000000000
 deref_stack_reg+0x19f/0x230
 unwind_next_frame+0x18c6/0x23c0
 __unwind_start+0x5b8/0x760
 arch_stack_walk+0xe3/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_mempool_unpoison_object+0x9f/0x130
 napi_skb_cache_get+0x3c8/0x780
 __alloc_skb+0x19a/0x7d0
 wg_packet_send_keepalive+0x65/0x2c0
 call_timer_fn+0x192/0x640
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:irqentry_exit+0x14e/0x620
Code: 00 00 c0 4c 8d a0 00 e0 ff 3f bd ff ff ff 9f 4c 8d 7c 24 18 f7 c7 37 03 00 00 74 64 49 89 fd e8 f8 af 1e f6 4c 89 e8 fb a8 30 <74> 08 e8 4b 23 01 00 4c 89 e8 a9 00 01 00 00 74 0b 4c 89 f7 e8 c9
RSP: 0000:ffffc900085efee8 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff888106f53a80 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8def9047 RDI: ffffffff8c27ca00
RBP: 000000009fffffff R08: ffffffff9011b4b7 R09: 1ffffffff2023696
R10: dffffc0000000000 R11: fffffbfff2023697 R12: 00000000ffffe000
R13: 0000000000000002 R14: ffffc900085eff48 R15: ffffc900085eff00
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0033:0x7f9d7579c819
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:00007f9d765b90e8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 00007f9d75a15fa8 RCX: 00007f9d7579c819
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f9d75a15fac
RBP: 00007f9d75a15fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9d75a16038 R14: 00007fff1d654820 R15: 00007fff1d654908
 </TASK>
