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SubjectBUG: unable to handle kernel NULL pointer dereference at 0000000000000018
Hi all:

I got a kernel panic after execute "systemctl reboot".

Nov 24 09:02:06 desktop systemd[713]: Stopped target Timers.
Nov 24 09:02:06 desktop systemd[713]: Reached target Shutdown.
Nov 24 09:02:06 desktop systemd[713]: Starting Exit the Session...
Nov 24 09:02:06 desktop kernel: ------------[ cut here ]------------
Nov 24 09:02:06 desktop kernel: WARNING: CPU: 3 PID: 1 at
kernel/fork.c:414 __put_task_struct+0xd4/0x130
Nov 24 09:02:06 desktop kernel: Modules linked in: macvtap macvlan
vhost_net vhost tap algif_skcipher xt_CHECKSUM iptable_mangle
ipt_MASQUER
Nov 24 09:02:06 desktop kernel: ptp snd_pcm mei crc_itu_t pps_core
button nfsd sch_fq_codel auth_rpcgss nfs_acl lockd nct6775 grace
hwmon_v
Nov 24 09:02:06 desktop kernel: CPU: 3 PID: 1 Comm: systemd Not
tainted 4.14.1-gentoo_pure-x64-op #3
Nov 24 09:02:06 desktop kernel: Hardware name: System manufacturer
System Product Name/P9X79 WS, BIOS 4802 06/02/2015
Nov 24 09:02:06 desktop kernel: task: ffff88081bef0000 task.stack:
ffffc90000008000
Nov 24 09:02:06 desktop kernel: RIP: 0010:__put_task_struct+0xd4/0x130
Nov 24 09:02:06 desktop kernel: RSP: 0018:ffffc9000000bdd8 EFLAGS: 00010246
Nov 24 09:02:06 desktop kernel: RAX: 0000000000000000 RBX:
ffff8807fa3476c0 RCX: 0000000000000001
Nov 24 09:02:06 desktop kernel: RDX: ffffc9000000be38 RSI:
ffff8807fa3476c0 RDI: ffff8807fa3476c0
Nov 24 09:02:06 desktop kernel: RBP: ffffc9000000bf28 R08:
0000000000001000 R09: 0000000000000007
Nov 24 09:02:06 desktop kernel: R10: 000055928ae63660 R11:
ffff880815825006 R12: ffff880814701900
Nov 24 09:02:06 desktop kernel: R13: 0000000000001000 R14:
ffff8807fa3476c0 R15: ffff880814d79f80
Nov 24 09:02:06 desktop kernel: FS: 00007f1b5d6d88c0(0000)
GS:ffff88083fcc0000(0000) knlGS:0000000000000000
Nov 24 09:02:06 desktop kernel: CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Nov 24 09:02:06 desktop kernel: CR2: 000055928ae79088 CR3:
0000000819990006 CR4: 00000000001626e0
Nov 24 09:02:06 desktop kernel: Call Trace:
Nov 24 09:02:06 desktop kernel: css_task_iter_next+0x61/0x70
Nov 24 09:02:06 desktop kernel: kernfs_seq_next+0x1e/0x50
Nov 24 09:02:06 desktop kernel: ? cgroup_procs_show+0x21/0x30
Nov 24 09:02:06 desktop kernel: seq_read+0x2b8/0x380
Nov 24 09:02:06 desktop kernel: __vfs_read+0x1e/0x120
Nov 24 09:02:06 desktop kernel: vfs_read+0x8c/0x130
Nov 24 09:02:06 desktop kernel: SyS_read+0x3d/0x90
Nov 24 09:02:06 desktop kernel: entry_SYSCALL_64_fastpath+0x13/0x94
Nov 24 09:02:06 desktop kernel: RIP: 0033:0x7f1b5ba9a1ad
Nov 24 09:02:06 desktop kernel: RSP: 002b:00007ffcdf3da830 EFLAGS:
00000293 ORIG_RAX: 0000000000000000
Nov 24 09:02:06 desktop kernel: RAX: ffffffffffffffda RBX:
000000000000005d RCX: 00007f1b5ba9a1ad
Nov 24 09:02:06 desktop kernel: RDX: 0000000000001000 RSI:
000055928ae6ab40 RDI: 000000000000005d
Nov 24 09:02:06 desktop kernel: RBP: 00007f1b5d6d8730 R08:
0000000000001010 R09: 00007f1b5d6d88c0
Nov 24 09:02:06 desktop kernel: R10: 000055928ae63660 R11:
0000000000000293 R12: 0000000000000000
Nov 24 09:02:06 desktop kernel: R13: 0000000000000001 R14:
0000000000000000 R15: 0000000000000003
Nov 24 09:02:06 desktop kernel: Code: 48 85 d2 74 06 f0 ff 4a 4c 74 34
48 8b 3d 1d 24 09 01 48 89 ee e8 cd 42 10 00 48 89 df 5b 5d e9 f3 fe
Nov 24 09:02:06 desktop kernel: ---[ end trace 47a5e18e047da55e ]---
Nov 24 09:02:06 desktop kernel: BUG: unable to handle kernel NULL
pointer dereference at 0000000000000018
Nov 24 09:02:06 desktop kernel: IP: exit_creds+0x16/0x40
Nov 24 09:02:06 desktop kernel: PGD 0 P4D 0
Nov 24 09:02:06 desktop kernel: Oops: 0002 [#1] PREEMPT SMP
Nov 24 09:02:06 desktop kernel: Modules linked in: macvtap macvlan
vhost_net vhost tap algif_skcipher xt_CHECKSUM iptable_mangle
ipt_MASQUER
Nov 24 09:02:06 desktop kernel: ptp snd_pcm mei crc_itu_t pps_core
button nfsd sch_fq_codel auth_rpcgss nfs_acl lockd nct6775 grace
hwmon_v
Nov 24 09:02:06 desktop kernel: CPU: 3 PID: 1 Comm: systemd Tainted: G
W 4.14.1-gentoo_pure-x64-op #3
Nov 24 09:02:06 desktop kernel: Hardware name: System manufacturer
System Product Name/P9X79 WS, BIOS 4802 06/02/2015
Nov 24 09:02:06 desktop kernel: task: ffff88081bef0000 task.stack:
ffffc90000008000
Nov 24 09:02:06 desktop kernel: RIP: 0010:exit_creds+0x16/0x40
Nov 24 09:02:06 desktop kernel: RSP: 0018:ffffc9000000bdc8 EFLAGS: 00010246
Nov 24 09:02:06 desktop kernel: RAX: 0000000000000001 RBX:
ffff8807fa3476c0 RCX: 0000000000000000
Nov 24 09:02:06 desktop kernel: RDX: 0000000055ed9557 RSI:
0000000000000000 RDI: 0000000000000018
Nov 24 09:02:06 desktop kernel: RBP: ffffc9000000bf28 R08:
0000000000001000 R09: 0000000000000007
Nov 24 09:02:06 desktop kernel: R10: 000055928ae63660 R11:
ffff880815825006 R12: ffff880814701900
Nov 24 09:02:06 desktop kernel: R13: 0000000000001000 R14:
ffff8807fa3476c0 R15: ffff880814d79f80
Nov 24 09:02:06 desktop kernel: FS: 00007f1b5d6d88c0(0000)
GS:ffff88083fcc0000(0000) knlGS:0000000000000000
Nov 24 09:02:06 desktop kernel: CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Nov 24 09:02:06 desktop kernel: CR2: 0000000000000018 CR3:
0000000819990006 CR4: 00000000001626e0
Nov 24 09:02:06 desktop kernel: Call Trace:
Nov 24 09:02:06 desktop kernel: __put_task_struct+0x48/0x130
Nov 24 09:02:06 desktop kernel: css_task_iter_next+0x61/0x70
Nov 24 09:02:06 desktop kernel: kernfs_seq_next+0x1e/0x50
Nov 24 09:02:06 desktop kernel: ? cgroup_procs_show+0x21/0x30
Nov 24 09:02:06 desktop kernel: seq_read+0x2b8/0x380
Nov 24 09:02:06 desktop kernel: __vfs_read+0x1e/0x120
Nov 24 09:02:06 desktop kernel: vfs_read+0x8c/0x130
Nov 24 09:02:06 desktop kernel: SyS_read+0x3d/0x90
Nov 24 09:02:06 desktop kernel: entry_SYSCALL_64_fastpath+0x13/0x94
Nov 24 09:02:06 desktop kernel: RIP: 0033:0x7f1b5ba9a1ad
Nov 24 09:02:06 desktop kernel: RSP: 002b:00007ffcdf3da830 EFLAGS:
00000293 ORIG_RAX: 0000000000000000
Nov 24 09:02:06 desktop kernel: RAX: ffffffffffffffda RBX:
000000000000005d RCX: 00007f1b5ba9a1ad
Nov 24 09:02:06 desktop kernel: RDX: 0000000000001000 RSI:
000055928ae6ab40 RDI: 000000000000005d
Nov 24 09:02:06 desktop kernel: RBP: 00007f1b5d6d8730 R08:
0000000000001010 R09: 00007f1b5d6d88c0
Nov 24 09:02:06 desktop kernel: R10: 000055928ae63660 R11:
0000000000000293 R12: 0000000000000000
Nov 24 09:02:06 desktop kernel: R13: 0000000000000001 R14:
0000000000000000 R15: 0000000000000003
Nov 24 09:02:06 desktop kernel: Code: df e8 9f fb ff ff 31 db 48 89 d8
5b 5d c3 e8 f2 fc ff ff 66 90 53 48 89 fb 48 8b bf f0 05 00 00 48 c7
Nov 24 09:02:06 desktop kernel: RIP: exit_creds+0x16/0x40 RSP: ffffc9000000bdc8

$ uname -a
Linux desktop 4.14.1-gentoo_pure-x64-op #3 SMP PREEMPT Wed Nov 22
09:46:21 WET 2017 x86_64 Intel(R) Core(TM) i7-4820K CPU @ 3.70GHz
GenuineIntel GNU/Linux

Please let me know if you need more detailed system information.

Thanks for your time, your work and your attention.

Kind regards,
Jesús Rodríguez Acosta

--
http://es.linkedin.com/in/jesusrodriguezacosta

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