Public bug reported:
Server freezes in week period approximately with this syslog message:
Feb 18 11:26:32 server kernel: [849924.991842] ------------[ cut here
]------------
Feb 18 11:26:32 server kernel: [849924.991867] WARNING: CPU: 19 PID: 32274 at
/build/linux-lts-vivid-LIqOuh/linux-lts-vivid-3.19.0/include/linux/kref.h:47
kref_get.part.0+0x1e/0x27()
Feb 18 11:26:32 server kernel: [849924.991870] Modules linked in: btrfs xor
raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c ipmi_devintf
xt_recent xt_multiport quota_v2 quota_tree ipt_REJ
ECT nf_reject_ipv4 xt_comment nf_log_ipv4 nf_log_common xt_LOG xt_tcpudp
xt_limit xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack
ip6table_filter ast ip6_tables ttm iptable_filter drm_kms_helper ip
mi_ssif intel_rapl ip_tables iosf_mbi drm x_tables syscopyarea sysfillrect
x86_pkg_temp_thermal intel_powerclamp kvm_intel sysimgblt kvm joydev
crct10dif_pclmul crc32_pclmul lpc_ich cryptd sb_edac mei_me eda
c_core mei ipmi_si ipmi_msghandler 8250_fintek nf_conntrack_ftp nf_conntrack
wmi shpchp ioatdma coretemp acpi_pad acpi_power_meter mac_hid lp parport igb
hid_generic i2c_algo_bit dca usbhid megaraid_sas ahci
ptp hid libahci pps_core
Feb 18 11:26:32 server kernel: [849924.991960] CPU: 19 PID: 32274 Comm: pop3
Not tainted 3.19.0-49-generic #55~14.04.1-Ubuntu
Feb 18 11:26:32 server kernel: [849924.991963] Hardware name: Supermicro
X10DRW/X10DRW-i, BIOS 1.0b 10/29/2014
Feb 18 11:26:32 server kernel: [849924.991965] ffffffff81a91160
ffff8805ca80b878 ffffffff817b01b5 0000000000000000
Feb 18 11:26:32 server kernel: [849924.991970] 0000000000000000
ffff8805ca80b8b8 ffffffff81074dea ffff88086afa3840
Feb 18 11:26:32 server kernel: [849924.991973] ffff88046b217100
ffff88046b217100 ffff88046b218030 ffff88086af2f430
Feb 18 11:26:32 server kernel: [849924.991978] Call Trace:
Feb 18 11:26:32 server kernel: [849924.991987] [<ffffffff817b01b5>]
dump_stack+0x45/0x57
Feb 18 11:26:32 server kernel: [849924.991994] [<ffffffff81074dea>]
warn_slowpath_common+0x8a/0xc0
Feb 18 11:26:32 server kernel: [849924.991998] [<ffffffff81074eda>]
warn_slowpath_null+0x1a/0x20
Feb 18 11:26:32 server kernel: [849924.992002] [<ffffffff817afee1>]
kref_get.part.0+0x1e/0x27
Feb 18 11:26:32 server kernel: [849924.992014] [<ffffffff8134df15>]
aa_label_merge+0x445/0x7c0
Feb 18 11:26:32 server kernel: [849924.992020] [<ffffffff8134ac42>]
update_file_cxt+0x32/0x80
Feb 18 11:26:32 server kernel: [849924.992024] [<ffffffff8134b86a>]
aa_file_perm+0x11a/0x440
Feb 18 11:26:32 server kernel: [849924.992033] [<ffffffff81202f7c>] ?
prepend_path+0xcc/0x2a0
Feb 18 11:26:32 server kernel: [849924.992038] [<ffffffff81348b8a>]
common_file_perm+0x4a/0x100
Feb 18 11:26:32 server kernel: [849924.992043] [<ffffffff81348c91>]
apparmor_file_receive+0x51/0x60
Feb 18 11:26:32 server kernel: [849924.992050] [<ffffffff81308a66>]
security_file_receive+0x16/0x20
Feb 18 11:26:32 server kernel: [849924.992059] [<ffffffff816a0768>]
scm_detach_fds+0x148/0x260
Feb 18 11:26:32 server kernel: [849924.992070] [<ffffffff8174b0d1>]
unix_stream_recvmsg+0x681/0x950
Feb 18 11:26:32 server kernel: [849924.992075] [<ffffffff81352b41>] ?
aa_sock_msg_perm+0x81/0x150
Feb 18 11:26:32 server kernel: [849924.992081] [<ffffffff8168f862>]
sock_recvmsg+0xa2/0xd0
Feb 18 11:26:32 server kernel: [849924.992086] [<ffffffff8168f4fe>] ?
copy_msghdr_from_user+0x15e/0x1f0
Feb 18 11:26:32 server kernel: [849924.992090] [<ffffffff8168f683>]
___sys_recvmsg+0xf3/0x230
Feb 18 11:26:32 server kernel: [849924.992096] [<ffffffff81230947>] ?
ep_send_events_proc+0xa7/0x1c0
Feb 18 11:26:32 server kernel: [849924.992100] [<ffffffff812308a0>] ?
ep_read_events_proc+0xc0/0xc0
Feb 18 11:26:32 server kernel: [849924.992104] [<ffffffff81231249>] ?
ep_scan_ready_list.isra.8+0x199/0x1c0
Feb 18 11:26:32 server kernel: [849924.992108] [<ffffffff812313a0>] ?
ep_poll+0x110/0x350
Feb 18 11:26:32 server kernel: [849924.992112] [<ffffffff81690aa2>]
__sys_recvmsg+0x42/0x80
Feb 18 11:26:32 server kernel: [849924.992116] [<ffffffff81690af2>]
SyS_recvmsg+0x12/0x20
Feb 18 11:26:32 server kernel: [849924.992127] [<ffffffff817b7c0d>]
system_call_fastpath+0x16/0x1b
Feb 18 11:26:32 server kernel: [849924.992130] ---[ end trace 59885196d131ae8e
]---
Feb 18 11:26:32 server kernel: [849925.019773] BUG: unable to handle kernel
NULL pointer dereference at 0000000000000098
Feb 18 11:26:32 server kernel: [849925.019849] IP: [<ffffffff8134db17>]
aa_label_merge+0x47/0x7c0
Feb 18 11:26:32 server kernel: [849925.019917] PGD 0
Feb 18 11:26:32 server kernel: [849925.019938] Oops: 0000 [#1] SMP
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-extra-3.19.0-49-generic 3.19.0-49.55~14.04.1
ProcVersionSignature: Ubuntu 3.19.0-49.55~14.04.1-generic 3.19.8-ckt12
Uname: Linux 3.19.0-49-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
Date: Thu Feb 18 13:42:09 2016
InstallationDate: Installed on 2015-08-12 (190 days ago)
InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64
(20150805)
SourcePackage: linux-lts-vivid
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-lts-vivid (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1547011
Title:
kernel error
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