BUG: Bad rss-counter state mm:f4f57600 idx:1 val:1
BUG: unable to handle kernel NULL pointer dereference at 00000004
IP: release_task+0x19/0x460
*pdpt = 00000000346c6001 *pde = 0000000000000000 

Oops: 0002 [#3] SMP
Modules linked in: gpio_ich dell_laptop dell_smm_hwmon coretemp snd_hda_codec_idt snd_hda_codec_generic joydev input_leds dell_wmi snd_hda_intel serio_raw dell_smbios wl(POE) dcdbas snd_hda_codec sparse_keymap cfg80211 snd_hda_core wmi_bmof snd_hwdep snd_pcm snd_timer lpc_ich shpchp snd soundcore mac_hid binfmt_misc parport_pc ppdev lp parport dm_crypt ip_tables x_tables autofs4 raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear ums_realtek uas usb_storage i915 psmouse i2c_algo_bit drm_kms_helper syscopyarea ahci sysfillrect sysimgblt sky2 fb_sys_fops libahci drm wmi video
CPU: 0 PID: 526 Comm: set-cpufreq Tainted: P      D W  OE   4.13.0-16-generic #19-Ubuntu
Hardware name: Dell Inc. Inspiron 1545                   /0G848F, BIOS A08 06/03/2009
task: f0f75000 task.stack: f3e1e000
EIP: release_task+0x19/0x460
EFLAGS: 00010286 CPU: 0
EAX: 00000000 EBX: f0c83c00 ECX: 00000000 EDX: 00000000
ESI: 00000010 EDI: f0c83c00 EBP: f3e1fe2c ESP: f3e1fe00
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
CR0: 80050033 CR2: 00000004 CR3: 33eec260 CR4: 000406f0
Call Trace:
 wait_consider_task+0x9c6/0xa20
 do_wait+0x10b/0x210
 kernel_wait4+0x7c/0x120
 ? task_stopped_code+0x60/0x60
 SyS_wait4+0x77/0x90
 ? __do_page_fault+0x228/0x500
 do_fast_syscall_32+0x71/0x150
 entry_SYSENTER_32+0x4e/0x7c
EIP: 0xb7fb6cf9
EFLAGS: 00000286 CPU: 0
EAX: ffffffda EBX: ffffffff ECX: bfd9ada4 EDX: 00000000
ESI: 00000000 EDI: 00453e54 EBP: bfd9ada4 ESP: bfd9ad34
 DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
 ? dmi_scan_machine+0xc1/0x1d9
 ? dmi_scan_machine+0xc1/0x1d9
 ? dmi_scan_machine+0xc1/0x1d9
 ? dmi_scan_machine+0xc1/0x1d9
Code: 89 fa ff d1 8b 0b 85 c9 75 f0 eb b5 8d b6 00 00 00 00 66 66 66 66 90 55 89 e5 57 56 53 89 c7 83 ec 20 8b 87 e0 04 00 00 8b 40 68 <f0> ff 48 04 89 f8 e8 cc 4d 20 00 b8 c0 c1 b8 cc e8 d2 db 7c 00
EIP: release_task+0x19/0x460 SS:ESP: 0068:f3e1fe00
CR2: 0000000000000004
---[ end trace 1346bf65fd99bcbe ]---