Message-Id: <1513512885.3653140.1207725096.395A9CCC@webmail.messagingengine.com>
Date:   Sun, 17 Dec 2017 12:14:45 +0000
From:   Bronek Kozicki <brok@...orrekt.com>
To:     linux-kernel@...r.kernel.org
Subject: PROBLEM: NULL pointer dereference in kernel 4.14.6

Hello


I noticed my system is less stable after upgrade from kernel 4.13 to
4.14.6 yesterday. There was a soft CPU lockup, hard CPU lockup and one
kernel panic while shutting down the system, all on the same day. There
was little diagnostic information collected at the time, but since then
I've enabled some debugging options (SLUB_DEBUG_ON ,
DEBUG_STACKOVERFLOW, DEBUG_LIST, BUG_ON_DATA_CORRUPTION, UBSAN,
UBSAN_SANITIZE_ALL and UBSAN_NULL - a full kernel config is attached).
My distribution is ArchLinux but I configure and build my own kernel. In
case that matters, the hardware is : two Xeon E5-2667 v2 @ 3.30GH ,
128GB RAM (with ECC) of which 80GB is reserved as huge pages for virtual
machines, total memory utilisation usually between 100GB - 110GB (swap
configured but not used).

Today I captured the below. This happened when I tried to start
"systemctl status" twice, the process was immediately killed on both
occasions. As you will notice my kernel is tainted - I am running ZFS as
my root filesystem, built from
https://github.com/zfsonlinux/zfs/tree/zfs-0.7.4 (package based on
https://github.com/archzfs/archzfs ). Hope that does not make this
report *totally* useless. In case it is considered to be useless, please
tell me so, as I do not want to create distraction.

I will send followup if I see further problems (unless told not to).
Please note I am not a subscriber to lkml, so Cc will be appreciated. I
have not noticed similar problems with kernel 4.13 , but I cannot run
bisect (the machine is in use, most of the time).


2017-12-17T11:06:45,938214+0000 ------------[ cut here ]------------
2017-12-17T11:06:45,938224+0000 WARNING: CPU: 9 PID: 22368 at
kernel/fork.c:414 __put_task_struct+0x160/0x230
2017-12-17T11:06:45,938225+0000 Modules linked in: ebtable_filter
ebtables ip6table_filter ip6_tables iptable_filter devlink joydev
hid_logitech_hidpp mxm_wmi intel_rapl sb_edac x86_pkg_temp_thermal
intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul
crc32c_i
ntel ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd
glue_helper cryptd ext4 intel_cstate crc16 mbcache jbd2 fscrypto
nls_iso8859_1 nls_cp437 vfat fat evdev input_leds led_class
intel_rapl_perf hid_logitech_dj mac_hid pcspkr igb ptp pps_core i2c_i801
lpc_ich i2c_al
go_bit tpm_tis mei_me ioatdma tpm_tis_core mei shpchp dca tpm wmi button
sch_fq_codel sg ip_tables x_tables usbhid hid zfs(PO) zunicode(PO)
zavl(PO) icp(PO) sd_mod serio_raw atkbd libps2 ahci isci xhci_pci
libahci mpt3sas libsas ehci_pci raid_class xhci_hcd ehci_hcd libata
2017-12-17T11:06:45,938266+0000  scsi_transport_sas usbcore scsi_mod
usb_common i8042 serio zcommon(PO) znvpair(PO) spl(O) nvme nvme_core
bridge stp llc vhost_net tun tap vhost vfio_pci irqbypass vfio_virqfd
vfio_iommu_type1 vfio
2017-12-17T11:06:45,938278+0000 CPU: 9 PID: 22368 Comm: systemctl
Tainted: P           O    4.14.6-2-ARCH #1
2017-12-17T11:06:45,938279+0000 Hardware name: Supermicro
X9DA7/E/X9DA7/E, BIOS 3.0a 07/02/2014
2017-12-17T11:06:45,938280+0000 task: ffffa03a7f2f3100 task.stack:
ffffaed1fcf64000
2017-12-17T11:06:45,938282+0000 RIP: 0010:__put_task_struct+0x160/0x230
2017-12-17T11:06:45,938283+0000 RSP: 0018:ffffaed1fcf67d50 EFLAGS:
00010246
2017-12-17T11:06:45,938284+0000 RAX: 0000000000000000 RBX:
ffffa03dc6cda018 RCX: 0000000000000001
2017-12-17T11:06:45,938284+0000 RDX: ffffaed1fcf67df8 RSI:
ffffa03dc6cda018 RDI: ffffa03dc6cda018
2017-12-17T11:06:45,938285+0000 RBP: ffffffffa11e51a0 R08:
0000000000ffff0a R09: 0000000000000008
2017-12-17T11:06:45,938286+0000 R10: ffffaed1fcf67cf8 R11:
0000000000000000 R12: ffffaed1fcf67df8
2017-12-17T11:06:45,938286+0000 R13: ffffa03dc6cda018 R14:
ffffa03dc6cda018 R15: ffffa048a5d893f8
2017-12-17T11:06:45,938287+0000 FS:  00007fbc477598c0(0000)
GS:ffffa0583fa40000(0000) knlGS:0000000000000000
2017-12-17T11:06:45,938288+0000 CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
2017-12-17T11:06:45,938289+0000 CR2: 000055acab282f88 CR3:
00000002da550005 CR4: 00000000001626e0
2017-12-17T11:06:45,938289+0000 Call Trace:
2017-12-17T11:06:45,938294+0000  ? seq_printf+0x4e/0x70
2017-12-17T11:06:45,938297+0000  css_task_iter_next+0x74/0x90
2017-12-17T11:06:45,938300+0000  kernfs_seq_next+0x58/0x110
2017-12-17T11:06:45,938301+0000  seq_read+0x36c/0x620
2017-12-17T11:06:45,938306+0000  ? __handle_mm_fault+0xb10/0x1630
2017-12-17T11:06:45,938309+0000  __vfs_read+0x54/0x2e0
2017-12-17T11:06:45,938310+0000  vfs_read+0x9d/0x200
2017-12-17T11:06:45,938311+0000  SyS_read+0x52/0xc0
2017-12-17T11:06:45,938317+0000  entry_SYSCALL_64_fastpath+0x1a/0xa5
2017-12-17T11:06:45,938319+0000 RIP: 0033:0x7fbc47072a11
2017-12-17T11:06:45,938319+0000 RSP: 002b:00007fff8b1e5758 EFLAGS:
00000246 ORIG_RAX: 0000000000000000
2017-12-17T11:06:45,938320+0000 RAX: ffffffffffffffda RBX:
00007fbc4733daa0 RCX: 00007fbc47072a11
2017-12-17T11:06:45,938321+0000 RDX: 0000000000001000 RSI:
000055acab281f80 RDI: 0000000000000008
2017-12-17T11:06:45,938321+0000 RBP: 00007fbc4733db00 R08:
0000000000000003 R09: ffffffffffffffb0
2017-12-17T11:06:45,938322+0000 R10: 0000000000001000 R11:
0000000000000246 R12: 0000000000001010
2017-12-17T11:06:45,938323+0000 R13: 00007fbc4733db00 R14:
0000000000001000 R15: 0000000000000001
2017-12-17T11:06:45,938324+0000 Code: 44 24 10 65 48 33 04 25 28 00 00
00 0f 85 85 00 00 00 48 83 c4 18 48 89 df 5b 5d 41 5c 41 5d e9 27 fe ff
ff 0f ff e9 ee fe ff ff <0f> ff e9 d2 fe ff ff 0f ff e9 f2 fe ff ff 4d
8d ac 24 d0 03 00
2017-12-17T11:06:45,938342+0000 ---[ end trace 8979357ae8817e59 ]---
2017-12-17T11:06:45,938343+0000
================================================================================
2017-12-17T11:06:45,946841+0000 UBSAN: Undefined behaviour in
kernel/cgroup/pids.c:67:9
2017-12-17T11:06:45,953117+0000 member access within null pointer of
type 'struct pids_cgroup'
2017-12-17T11:06:45,960032+0000 CPU: 9 PID: 22368 Comm: systemctl
Tainted: P        W  O    4.14.6-2-ARCH #1
2017-12-17T11:06:45,960033+0000 Hardware name: Supermicro
X9DA7/E/X9DA7/E, BIOS 3.0a 07/02/2014
2017-12-17T11:06:45,960033+0000 Call Trace:
2017-12-17T11:06:45,960038+0000  dump_stack+0x70/0xae
2017-12-17T11:06:45,960043+0000  ubsan_epilogue+0x9/0x40
2017-12-17T11:06:45,960045+0000 
__ubsan_handle_type_mismatch+0x104/0x180
2017-12-17T11:06:45,960057+0000  pids_free+0x99/0xb0
2017-12-17T11:06:45,960058+0000  cgroup_free+0xaa/0x190
2017-12-17T11:06:45,960060+0000  __put_task_struct+0x68/0x230
2017-12-17T11:06:45,960062+0000  ? seq_printf+0x4e/0x70
2017-12-17T11:06:45,960063+0000  css_task_iter_next+0x74/0x90
2017-12-17T11:06:45,960064+0000  kernfs_seq_next+0x58/0x110
2017-12-17T11:06:45,960066+0000  seq_read+0x36c/0x620
2017-12-17T11:06:45,960068+0000  ? __handle_mm_fault+0xb10/0x1630
2017-12-17T11:06:45,960069+0000  __vfs_read+0x54/0x2e0
2017-12-17T11:06:45,960070+0000  vfs_read+0x9d/0x200
2017-12-17T11:06:45,960072+0000  SyS_read+0x52/0xc0
2017-12-17T11:06:45,960073+0000  entry_SYSCALL_64_fastpath+0x1a/0xa5
2017-12-17T11:06:45,960074+0000 RIP: 0033:0x7fbc47072a11
2017-12-17T11:06:45,960075+0000 RSP: 002b:00007fff8b1e5758 EFLAGS:
00000246 ORIG_RAX: 0000000000000000
2017-12-17T11:06:45,960076+0000 RAX: ffffffffffffffda RBX:
00007fbc4733daa0 RCX: 00007fbc47072a11
2017-12-17T11:06:45,960077+0000 RDX: 0000000000001000 RSI:
000055acab281f80 RDI: 0000000000000008
2017-12-17T11:06:45,960077+0000 RBP: 00007fbc4733db00 R08:
0000000000000003 R09: ffffffffffffffb0
2017-12-17T11:06:45,960078+0000 R10: 0000000000001000 R11:
0000000000000246 R12: 0000000000001010
2017-12-17T11:06:45,960079+0000 R13: 00007fbc4733db00 R14:
0000000000001000 R15: 0000000000000001
2017-12-17T11:06:45,960080+0000
================================================================================
2017-12-17T11:06:45,969848+0000 BUG: unable to handle kernel NULL
pointer dereference at 00000000000000b0
2017-12-17T11:06:45,977727+0000 IP: pids_free+0x28/0xb0
2017-12-17T11:06:45,981213+0000 PGD 0 P4D 0
2017-12-17T11:06:45,983783+0000 Oops: 0000 [#1] SMP
2017-12-17T11:06:45,986934+0000 Modules linked in: ebtable_filter
ebtables ip6table_filter ip6_tables iptable_filter devlink joydev
hid_logitech_hidpp mxm_wmi intel_rapl sb_edac x86_pkg_temp_thermal
intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul
crc32c_i
ntel ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd
glue_helper cryptd ext4 intel_cstate crc16 mbcache jbd2 fscrypto
nls_iso8859_1 nls_cp437 vfat fat evdev input_leds led_class
intel_rapl_perf hid_logitech_dj mac_hid pcspkr igb ptp pps_core i2c_i801
lpc_ich i2c_al
go_bit tpm_tis mei_me ioatdma tpm_tis_core mei shpchp dca tpm wmi button
sch_fq_codel sg ip_tables x_tables usbhid hid zfs(PO) zunicode(PO)
zavl(PO) icp(PO) sd_mod serio_raw atkbd libps2 ahci isci xhci_pci
libahci mpt3sas libsas ehci_pci raid_class xhci_hcd ehci_hcd libata
2017-12-17T11:06:46,057445+0000  scsi_transport_sas usbcore scsi_mod
usb_common i8042 serio zcommon(PO) znvpair(PO) spl(O) nvme nvme_core
bridge stp llc vhost_net tun tap vhost vfio_pci irqbypass vfio_virqfd
vfio_iommu_type1 vfio
2017-12-17T11:06:46,076039+0000 CPU: 0 PID: 22368 Comm: systemctl
Tainted: P        W  O    4.14.6-2-ARCH #1
2017-12-17T11:06:46,084121+0000 Hardware name: Supermicro
X9DA7/E/X9DA7/E, BIOS 3.0a 07/02/2014
2017-12-17T11:06:46,091081+0000 task: ffffa03a7f2f3100 task.stack:
ffffaed1fcf64000
2017-12-17T11:06:46,097000+0000 RIP: 0010:pids_free+0x28/0xb0
2017-12-17T11:06:46,101013+0000 RSP: 0018:ffffaed1fcf67ce8 EFLAGS:
00010282
2017-12-17T11:06:46,106239+0000 RAX: 0000000000000000 RBX:
0000000000000000 RCX: 0000000000000006
2017-12-17T11:06:46,113371+0000 RDX: 0000000000000000 RSI:
0000000000000202 RDI: 0000000000000202
2017-12-17T11:06:46,120513+0000 RBP: ffffa03dc6cda018 R08:
00000000000007bd R09: 0000000000000000
2017-12-17T11:06:46,127645+0000 R10: 00000000001f6ed8 R11:
00000000000ea650 R12: 000000005ee1a648
2017-12-17T11:06:46,134777+0000 R13: ffffffffa11e59c0 R14:
ffffa03db233a900 R15: ffffffffa11d44a0
2017-12-17T11:06:46,141910+0000 FS:  00007fbc477598c0(0000)
GS:ffffa047ffa00000(0000) knlGS:0000000000000000
2017-12-17T11:06:46,150031+0000 CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
2017-12-17T11:06:46,155845+0000 CR2: 000055bf3e43f9f0 CR3:
00000002da550006 CR4: 00000000001626f0
2017-12-17T11:06:46,163004+0000 Call Trace:
2017-12-17T11:06:46,165514+0000  cgroup_free+0xaa/0x190
2017-12-17T11:06:46,169019+0000  __put_task_struct+0x68/0x230
2017-12-17T11:06:46,173028+0000  ? seq_printf+0x4e/0x70
2017-12-17T11:06:46,176527+0000  css_task_iter_next+0x74/0x90
2017-12-17T11:06:46,180541+0000  kernfs_seq_next+0x58/0x110
2017-12-17T11:06:46,184380+0000  seq_read+0x36c/0x620
2017-12-17T11:06:46,187702+0000  ? __handle_mm_fault+0xb10/0x1630
2017-12-17T11:06:46,192060+0000  __vfs_read+0x54/0x2e0
2017-12-17T11:06:46,195463+0000  vfs_read+0x9d/0x200
2017-12-17T11:06:46,198696+0000  SyS_read+0x52/0xc0
2017-12-17T11:06:46,201847+0000  entry_SYSCALL_64_fastpath+0x1a/0xa5
2017-12-17T11:06:46,206463+0000 RIP: 0033:0x7fbc47072a11
2017-12-17T11:06:46,210039+0000 RSP: 002b:00007fff8b1e5758 EFLAGS:
00000246 ORIG_RAX: 0000000000000000
2017-12-17T11:06:46,217604+0000 RAX: ffffffffffffffda RBX:
00007fbc4733daa0 RCX: 00007fbc47072a11
2017-12-17T11:06:46,224737+0000 RDX: 0000000000001000 RSI:
000055acab281f80 RDI: 0000000000000008
2017-12-17T11:06:46,231861+0000 RBP: 00007fbc4733db00 R08:
0000000000000003 R09: ffffffffffffffb0
2017-12-17T11:06:46,238984+0000 R10: 0000000000001000 R11:
0000000000000246 R12: 0000000000001010
2017-12-17T11:06:46,246117+0000 R13: 00007fbc4733db00 R14:
0000000000001000 R15: 0000000000000001
2017-12-17T11:06:46,253253+0000 Code: 44 00 00 0f 1f 44 00 00 48 81 ff
c8 f7 ff ff 55 53 48 89 fb 74 4c 48 8b 9b 38 08 00 00 48 85 db 74 7c 48
8b 5b 50 48 85 db 74 63 <48> 83 bb b0 00 00 00 00 74 2a 48 c7 c5 60 a2
1e a1 48 89 df e8
2017-12-17T11:06:46,272137+0000 RIP: pids_free+0x28/0xb0 RSP:
ffffaed1fcf67ce8
2017-12-17T11:06:46,277621+0000 CR2: 00000000000000b0
2017-12-17T11:06:46,281044+0000 ---[ end trace 8979357ae8817e5a ]---
2017-12-17T11:06:54,977759+0000 ------------[ cut here ]------------
2017-12-17T11:06:54,982387+0000 WARNING: CPU: 3 PID: 23507 at
kernel/fork.c:414 __put_task_struct+0x160/0x230
2017-12-17T11:06:54,990551+0000 Modules linked in: ebtable_filter
ebtables ip6table_filter ip6_tables iptable_filter devlink joydev
hid_logitech_hidpp mxm_wmi intel_rapl sb_edac x86_pkg_temp_thermal
intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul
crc32c_intel ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd
glue_helper cryptd ext4 intel_cstate crc16 mbcache jbd2 fscrypto
nls_iso8859_1 nls_cp437 vfat fat evdev input_leds led_class
intel_rapl_perf hid_logitech_dj mac_hid pcspkr igb ptp pps_core i2c_i801
lpc_ich i2c_algo_bit tpm_tis mei_me ioatdma tpm_tis_core mei shpchp dca
tpm wmi button sch_fq_codel sg ip_tables x_tables usbhid hid zfs(PO)
zunicode(PO) zavl(PO) icp(PO) sd_mod serio_raw atkbd libps2 ahci isci
xhci_pci libahci mpt3sas libsas ehci_pci raid_class xhci_hcd ehci_hcd
libata
2017-12-17T11:06:55,060998+0000  scsi_transport_sas usbcore scsi_mod
usb_common i8042 serio zcommon(PO) znvpair(PO) spl(O) nvme nvme_core
bridge stp llc vhost_net tun tap vhost vfio_pci irqbypass vfio_virqfd
vfio_iommu_type1 vfio
2017-12-17T11:06:55,079579+0000 CPU: 3 PID: 23507 Comm: systemctl
Tainted: P      D W  O    4.14.6-2-ARCH #1
2017-12-17T11:06:55,087662+0000 Hardware name: Supermicro
X9DA7/E/X9DA7/E, BIOS 3.0a 07/02/2014
2017-12-17T11:06:55,094613+0000 task: ffffa03ace590040 task.stack:
ffffaed2046f4000
2017-12-17T11:06:55,100528+0000 RIP: 0010:__put_task_struct+0x160/0x230
2017-12-17T11:06:55,105402+0000 RSP: 0018:ffffaed2046f7d50 EFLAGS:
00010246
2017-12-17T11:06:55,110620+0000 RAX: 0000000000000000 RBX:
ffffa03dc3280598 RCX: 0000000000000001
2017-12-17T11:06:55,117743+0000 RDX: ffffaed2046f7df8 RSI:
ffffa03dc3280598 RDI: ffffa03dc3280598
2017-12-17T11:06:55,124869+0000 RBP: ffffffffa11e51a0 R08:
0000000000ffff0a R09: 0000000000000008
2017-12-17T11:06:55,131992+0000 R10: ffffaed2046f7cf8 R11:
0000000000000000 R12: ffffaed2046f7df8
2017-12-17T11:06:55,139116+0000 R13: ffffa03dc3280598 R14:
ffffa03dc3280598 R15: ffffa03b3b4d3bd8
2017-12-17T11:06:55,146240+0000 FS:  00007fd9e00178c0(0000)
GS:ffffa047ffac0000(0000) knlGS:0000000000000000
2017-12-17T11:06:55,154318+0000 CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
2017-12-17T11:06:55,160054+0000 CR2: 0000565393a1d038 CR3:
0000000310850003 CR4: 00000000001626e0
2017-12-17T11:06:55,167180+0000 Call Trace:
2017-12-17T11:06:55,169627+0000  ? seq_printf+0x4e/0x70
2017-12-17T11:06:55,173117+0000  css_task_iter_next+0x74/0x90
2017-12-17T11:06:55,177122+0000  kernfs_seq_next+0x58/0x110
2017-12-17T11:06:55,180959+0000  seq_read+0x36c/0x620
2017-12-17T11:06:55,184272+0000  __vfs_read+0x54/0x2e0
2017-12-17T11:06:55,187676+0000  vfs_read+0x9d/0x200
2017-12-17T11:06:55,190901+0000  SyS_read+0x52/0xc0
2017-12-17T11:06:55,194039+0000  entry_SYSCALL_64_fastpath+0x1a/0xa5
2017-12-17T11:06:55,198657+0000 RIP: 0033:0x7fd9df930a11
2017-12-17T11:06:55,202228+0000 RSP: 002b:00007fff897b16e8 EFLAGS:
00000246 ORIG_RAX: 0000000000000000
2017-12-17T11:06:55,209783+0000 RAX: ffffffffffffffda RBX:
0000000000000008 RCX: 00007fd9df930a11
2017-12-17T11:06:55,216909+0000 RDX: 0000000000001000 RSI:
0000565393a1c020 RDI: 0000000000000008
2017-12-17T11:06:55,224032+0000 RBP: 0000565393a02860 R08:
0000000000000003 R09: ffffffffffffffb0
2017-12-17T11:06:55,231157+0000 R10: 0000000000001000 R11:
0000000000000246 R12: 0000000000000000
2017-12-17T11:06:55,238281+0000 R13: 0000000000000000 R14:
0000565393a023b0 R15: 0000000000000000
2017-12-17T11:06:55,245405+0000 Code: 44 24 10 65 48 33 04 25 28 00 00
00 0f 85 85 00 00 00 48 83 c4 18 48 89 df 5b 5d 41 5c 41 5d e9 27 fe ff
ff 0f ff e9 ee fe ff ff <0f> ff e9 d2 fe ff ff 0f ff e9 f2 fe ff ff 4d
8d ac 24 d0 03 00
2017-12-17T11:06:55,264247+0000 ---[ end trace 8979357ae8817e5b ]---
2017-12-17T11:06:55,268889+0000 BUG: unable to handle kernel NULL
pointer dereference at 00000000000000b0
2017-12-17T11:06:55,276710+0000 IP: pids_free+0x28/0xb0
2017-12-17T11:06:55,280201+0000 PGD 0 P4D 0
2017-12-17T11:06:55,282733+0000 Oops: 0000 [#2] SMP
2017-12-17T11:06:55,285870+0000 Modules linked in: ebtable_filter
ebtables ip6table_filter ip6_tables iptable_filter devlink joydev
hid_logitech_hidpp mxm_wmi intel_rapl sb_edac x86_pkg_temp_thermal
intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul
crc32c_intel ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd
glue_helper cryptd ext4 intel_cstate crc16 mbcache jbd2 fscrypto
nls_iso8859_1 nls_cp437 vfat fat evdev input_leds led_class
intel_rapl_perf hid_logitech_dj mac_hid pcspkr igb ptp pps_core i2c_i801
lpc_ich i2c_algo_bit tpm_tis mei_me ioatdma tpm_tis_core mei shpchp dca
tpm wmi button sch_fq_codel sg ip_tables x_tables usbhid hid zfs(PO)
zunicode(PO) zavl(PO) icp(PO) sd_mod serio_raw atkbd libps2 ahci isci
xhci_pci libahci mpt3sas libsas ehci_pci raid_class xhci_hcd ehci_hcd
libata
2017-12-17T11:06:55,356310+0000  scsi_transport_sas usbcore scsi_mod
usb_common i8042 serio zcommon(PO) znvpair(PO) spl(O) nvme nvme_core
bridge stp llc vhost_net tun tap vhost vfio_pci irqbypass vfio_virqfd
vfio_iommu_type1 vfio
2017-12-17T11:06:55,374886+0000 CPU: 3 PID: 23507 Comm: systemctl
Tainted: P      D W  O    4.14.6-2-ARCH #1
2017-12-17T11:06:55,382969+0000 Hardware name: Supermicro
X9DA7/E/X9DA7/E, BIOS 3.0a 07/02/2014
2017-12-17T11:06:55,389923+0000 task: ffffa03ace590040 task.stack:
ffffaed2046f4000
2017-12-17T11:06:55,395844+0000 RIP: 0010:pids_free+0x28/0xb0
2017-12-17T11:06:55,399853+0000 RSP: 0018:ffffaed2046f7ce8 EFLAGS:
00010282
2017-12-17T11:06:55,405071+0000 RAX: 0000000000000000 RBX:
0000000000000000 RCX: 0000000000000000
2017-12-17T11:06:55,412196+0000 RDX: 0000000000000058 RSI:
0000000000000000 RDI: ffffffffa11ea2a0
2017-12-17T11:06:55,419319+0000 RBP: ffffa03dc3280598 R08:
0000000000ffff0a R09: 0000000000000008
2017-12-17T11:06:55,426443+0000 R10: ffffaed2046f7cf8 R11:
0000000000000000 R12: 000000005ee1a648
2017-12-17T11:06:55,433567+0000 R13: ffffffffa11e59c0 R14:
ffffa03c147618c0 R15: ffffffffa11d44a0
2017-12-17T11:06:55,440691+0000 FS:  00007fd9e00178c0(0000)
GS:ffffa047ffac0000(0000) knlGS:0000000000000000
2017-12-17T11:06:55,448768+0000 CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
2017-12-17T11:06:55,454504+0000 CR2: 00000000000000b0 CR3:
0000000310850003 CR4: 00000000001626e0
2017-12-17T11:06:55,461630+0000 Call Trace:
2017-12-17T11:06:55,464077+0000  cgroup_free+0xaa/0x190
2017-12-17T11:06:55,467570+0000  __put_task_struct+0x68/0x230
2017-12-17T11:06:55,471581+0000  ? seq_printf+0x4e/0x70
2017-12-17T11:06:55,475071+0000  css_task_iter_next+0x74/0x90
2017-12-17T11:06:55,479077+0000  kernfs_seq_next+0x58/0x110
2017-12-17T11:06:55,482916+0000  seq_read+0x36c/0x620
2017-12-17T11:06:55,486228+0000  __vfs_read+0x54/0x2e0
2017-12-17T11:06:55,489631+0000  vfs_read+0x9d/0x200
2017-12-17T11:06:55,492856+0000  SyS_read+0x52/0xc0
2017-12-17T11:06:55,495997+0000  entry_SYSCALL_64_fastpath+0x1a/0xa5
2017-12-17T11:06:55,500613+0000 RIP: 0033:0x7fd9df930a11
2017-12-17T11:06:55,504192+0000 RSP: 002b:00007fff897b16e8 EFLAGS:
00000246 ORIG_RAX: 0000000000000000
2017-12-17T11:06:55,511760+0000 RAX: ffffffffffffffda RBX:
0000000000000008 RCX: 00007fd9df930a11
2017-12-17T11:06:55,518891+0000 RDX: 0000000000001000 RSI:
0000565393a1c020 RDI: 0000000000000008
2017-12-17T11:06:55,526014+0000 RBP: 0000565393a02860 R08:
0000000000000003 R09: ffffffffffffffb0
2017-12-17T11:06:55,533138+0000 R10: 0000000000001000 R11:
0000000000000246 R12: 0000000000000000
2017-12-17T11:06:55,540262+0000 R13: 0000000000000000 R14:
0000565393a023b0 R15: 0000000000000000
2017-12-17T11:06:55,547388+0000 Code: 44 00 00 0f 1f 44 00 00 48 81 ff
c8 f7 ff ff 55 53 48 89 fb 74 4c 48 8b 9b 38 08 00 00 48 85 db 74 7c 48
8b 5b 50 48 85 db 74 63 <48> 83 bb b0 00 00 00 00 74 2a 48 c7 c5 60 a2
1e a1 48 89 df e8
2017-12-17T11:06:55,566241+0000 RIP: pids_free+0x28/0xb0 RSP:
ffffaed2046f7ce8
2017-12-17T11:06:55,571722+0000 CR2: 00000000000000b0
2017-12-17T11:06:55,575101+0000 ---[ end trace 8979357ae8817e5c ]---



-- 
  Bronek Kozicki
  brok@...orrekt.com


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