rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=5a14/1/0x4000000000000000 softirq=79809/79809 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5344/1:b..l
rcu: 	(detected by 1, t=28027 jiffies, g=59317, q=90 ncpus=2)
task:dhcpcd          state:R  running task     stack:24120 pid:5344  tgid:5344  ppid:1      task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 preempt_schedule_notrace+0x57/0x90
 preempt_schedule_notrace_thunk+0x16/0x30
 rcu_is_watching+0x7f/0xb0
 lock_release+0x4b/0x3c0
 dev_load+0x153/0x1f0
 dev_ioctl+0x680/0x1150
 sock_do_ioctl+0x23e/0x320
 sock_ioctl+0x5c6/0x7f0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc255556d49
RSP: 002b:00007ffe4badcac8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00005587c848f310 RCX: 00007fc255556d49
RDX: 00007ffe4badcad0 RSI: 0000000000008921 RDI: 0000000000000011
RBP: 0000000000000000 R08: 0000000000000008 R09: 0000000000000035
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe4badcad0
R13: 00005587acd0ff88 R14: 00005587c848f310 R15: 00005587c849a2d0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 28037 jiffies! g59317 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=13453
rcu: rcu_preempt kthread starved for 28038 jiffies! g59317 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
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:27536 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 12115 Comm: syz.4.1438 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:preempt_schedule_irq+0x48/0xa0
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 e3 5b ea f5 e8 8e 6e 24 f6 fb bf 01 00 00 00 <e8> 13 a3 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 54 70 24 f6 bf 01
RSP: 0018:ffffc90006386be0 EFLAGS: 00000206
RAX: 0000000000329639 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000007 RSI: ffffffff8dfa5c57 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff9030a7f7 R09: 1ffffffff20614fe
R10: dffffc0000000000 R11: fffffbfff20614ff R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007fbdafbce6c0(0000) GS:ffff8882a9290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001b84fe000 CR4: 0000000000352ef0
DR0: 000000000000000b DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 irqentry_exit+0x14f/0x730
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:vmx_read_guest_seg_selector+0x3a1/0x5d0
Code: 48 8d 9b c0 b1 c4 8b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 0f 85 9b 01 00 00 8b 1b 41 0f 78 de <0f> 86 0a 02 00 00 e8 e4 03 6a 00 4c 89 f8 48 c1 e8 03 48 b9 00 00
RSP: 0018:ffffc90006386d08 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000802 RCX: dffffc0000000000
RDX: ffffc9002c94e000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 0000000000000000 R08: ffff88810f2d5617 R09: 1ffff11021e5aac2
R10: dffffc0000000000 R11: ffffed1021e5aac3 R12: ffff88810f2d76c0
R13: 1ffff11021e5aed8 R14: 0000000000000030 R15: ffff88810f2d76e0
 vmx_get_segment+0x5be/0xaf0
 emulator_get_segment+0xd5/0x5a0
 __do_insn_fetch_bytes+0x3fb/0x700
 x86_decode_insn+0x38e/0x5df0
 x86_emulate_instruction+0x64a/0x2100
 kvm_mmu_page_fault+0x91a/0xb70
 vmx_handle_exit+0xd70/0x16f0
 vcpu_run+0x5c77/0x7860
 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: 0033:0x7fbdaed9cdd9
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:00007fbdafbce028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbdaf015fa0 RCX: 00007fbdaed9cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000007
RBP: 00007fbdaee32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbdaf016038 R14: 00007fbdaf015fa0 R15: 00007fff1a3903f8
 </TASK>
