rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (3 ticks this GP) idle=000c/1/0x4000000000000000 softirq=16614/16616 fqs=0
rcu: 	(t=29976 jiffies g=11609 q=226 ncpus=2)
rcu: rcu_preempt kthread starved for 29976 jiffies! g11609 f0x0 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:27536 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x389/0x470
 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1379 Comm: aoe_tx0 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+0x197b/0x2cf0
Code: 14 25 ff 0f 00 00 39 05 9f 75 9f 12 73 06 89 05 97 75 9f 12 48 8b 02 48 89 df 4c 39 e8 0f 84 2c fe ff ff 4c 89 60 30 48 8b 00 <4c> 39 e8 75 f4 48 89 df e9 18 fe ff ff 48 89 fb 48 c7 c7 30 ae 82
RSP: 0000:ffffc90008396f48 EFLAGS: 00000006
RAX: ffffffff96c5cf48 RBX: 00000000000003dd RCX: 000000000000000c
RDX: ffffffff96c52898 RSI: ffff888169dab130 RDI: 00000000000003dd
RBP: 85ffa4a0ac1a50e8 R08: ffffc90008396f10 R09: 0000000000000020
R10: 0000000000000003 R11: ffffffff81a22380 R12: ffffffff96c6fe08
R13: ffffffff93e2ab88 R14: ffff888169daa500 R15: 000000000000000b
FS:  0000000000000000(0000) GS:ffff88818dc89000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3ed69aa866 CR3: 00000001bbbd9000 CR4: 0000000000352ef0
DR0: 000000000000000b DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x106/0x350
 seqcount_lockdep_reader_access+0x55/0x100
 ktime_expiry_to_cycles+0x4e/0x1e0
 clockevents_program_event+0x199/0x630
 __hrtimer_rearm_deferred+0x270/0x450
 irqentry_exit+0x6d5/0x760
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:vprintk_emit+0x45d/0x560
Code: 0f 84 44 ff ff ff e8 62 28 21 00 fb eb 44 e8 5a 28 21 00 e8 e5 88 04 0a 4d 85 f6 74 94 e8 4b 28 21 00 fb 48 c7 c7 c0 f0 94 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 cb 18
RSP: 0000:ffffc900083973a0 EFLAGS: 00000293
RAX: ffffffff81a49c45 RBX: ffffffff81a49abf RCX: ffff888169daa500
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e94f0c0
RBP: ffffc90008397450 R08: ffffffff9030ccf7 R09: 1ffffffff206199e
R10: dffffc0000000000 R11: fffffbfff206199f R12: 0000000000000000
R13: 000000000000002d R14: 0000000000000200 R15: 1ffff92001072e78
 dev_vprintk_emit+0x355/0x420
 dev_printk_emit+0xee/0x140
 __netdev_printk+0x3e1/0x480
 netdev_warn+0x11e/0x180
 ieee802154_subif_start_xmit+0x136/0x190
 dev_hard_start_xmit+0x2cd/0x830
 sch_direct_xmit+0x251/0x4c0
 __dev_queue_xmit+0x180f/0x3950
 tx+0x6b/0x190
 kthread+0x1e0/0x3f0
 kthread+0x389/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
CPU: 1 UID: 0 PID: 5991 Comm: syz.0.73 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:vcpu_run+0x5a02/0x7860
Code: 4c 8b a4 24 28 01 00 00 4c 89 e3 48 c1 eb 03 42 0f b6 04 3b 84 c0 0f 85 1c 0b 00 00 41 c6 04 24 01 e8 62 ed 85 00 fb 4c 89 f0 <48> c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 db ff e8 00 49 ff 06
RSP: 0018:ffffc90009be75e0 EFLAGS: 00000206
RAX: ffff88810d1d1d60 RBX: 1ffff11021a3a187 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dfac14f RDI: ffffffff8c28b660
RBP: ffffc90009be79b0 R08: ffffffff9030ccf7 R09: 1ffffffff206199e
R10: dffffc0000000000 R11: fffffbfff206199f R12: ffff88810d1d0c3a
R13: ffff88810d1d0000 R14: ffff88810d1d1d60 R15: dffffc0000000000
FS:  00007f1ac79f66c0(0000) GS:ffff8882a9289000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000174ddc000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 kvm_arch_vcpu_ioctl_run+0x11e6/0x20d0
 kvm_vcpu_ioctl+0xa62/0xfd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1ac979ce59
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:00007f1ac79f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1ac9a15fa0 RCX: 00007f1ac979ce59
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000008
RBP: 00007f1ac9832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1ac9a16038 R14: 00007f1ac9a15fa0 R15: 00007ffcd32be4d8
 </TASK>
