It's a problem that it's a production server, I cannot play too much with it :-/ It was a freshly installed 16.04LTS according to the operators who did the install. According to the logs, the problematic kernel was:
Linux version 4.4.0-34-generic (buildd@lgw01-20) (gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2.1) ) #53-Ubuntu SMP Wed Jul 27 16:06:39 UTC 2016 (Ubuntu 4.4.0-34.53-generic 4.4.15) It was installed with: Linux version 4.4.0-31-generic (buildd@lgw01-16) (gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2.1) ) #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016 (Ubuntu 4.4.0- 31.50-generic 4.4.13) The -34- was already a kernel since upgrade packages. Now I have -36-, I haven't experienced with the bug yet since then at least. Additionaly, after the panic msg, every processes was stuck in 'D' state trying to do anything with apparmor (etc profile reload) including the postinst script of lxd which seems does that. After a reboot with -36- kernel, I could finish the upgrade with "dpkg --configure -a" though. If I again experience the bug, I'll try to test with latest upstream as you suggested (unfortunately, as I've told, I cannot "play" with this machine if it seems to be OK ...) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1615082 Title: kernel NULL pointer dereference on apparmor profile update Status in linux package in Ubuntu: Incomplete Bug description: I've used aa-logprof to find more things out to be added to my custom apache2 apparmor file. Since PHP created tons of files in /tmp in the form of /tmp/php* I've decided to add this: /tmp/php* rw, I'm not sure if it caused the problem, but after this /etc/init.d/apparmor reload froze and there was the following in the output of dmesg command: [13838.909880] audit: type=1400 audit(1471631019.426:1488): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/apache2" pid=23590 comm="apparmor_parser" [13838.920067] ------------[ cut here ]------------ [13838.920079] WARNING: CPU: 0 PID: 23590 at /build/linux-5vkMGy/linux-4.4.0/security/apparmor/label.c:142 profile_cmp+0xed/0x180() [13838.920083] AppArmor WARN profile_cmp: ((!b)): [13838.920085] Modules linked in: [13838.920088] binfmt_misc nf_conntrack_ftp nf_conntrack_irc ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipt_REJECT nf_reject_ipv4 xt_NFLOG nfnetlink_log nfnetlink xt_tcpudp xt_pkttype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack iptable_filter ip_tables x_tables gpio_ich ipmi_devintf coretemp ipmi_ssif kvm dcdbas irqbypass i5000_edac serio_raw edac_core lpc_ich joydev input_leds i5k_amb ipmi_si 8250_fintek ipmi_msghandler shpchp mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear ses enclosure amdkfd amd_iommu_v2 radeon i2c_algo_bit ttm drm_kms_helper [13838.920166] syscopyarea sysfillrect sysimgblt hid_generic fb_sys_fops usbhid uas e1000e ptp hid usb_storage psmouse drm megaraid_sas bnx2 pps_core pata_acpi fjes [13838.920188] CPU: 0 PID: 23590 Comm: apparmor_parser Not tainted 4.4.0-34-generic #53-Ubuntu [13838.920192] Hardware name: Dell Inc. PowerEdge 1950/0DT097, BIOS 2.7.0 10/30/2010 [13838.920195] 0000000000000086 0000000088f44738 ffff880128bffc00 ffffffff813f11b3 [13838.920199] ffff880128bffc48 ffffffff81cf08e8 ffff880128bffc38 ffffffff81081102 [13838.920204] ffff8800c8d7d400 0000000000000000 000000000000000a 0000000000000000 [13838.920208] Call Trace: [13838.920218] [<ffffffff813f11b3>] dump_stack+0x63/0x90 [13838.920224] [<ffffffff81081102>] warn_slowpath_common+0x82/0xc0 [13838.920228] [<ffffffff8108119c>] warn_slowpath_fmt+0x5c/0x80 [13838.920232] [<ffffffff813ffc40>] ? u32_swap+0x10/0x10 [13838.920236] [<ffffffff8139072d>] profile_cmp+0xed/0x180 [13838.920239] [<ffffffff81391843>] aa_vec_unique+0x163/0x240 [13838.920244] [<ffffffff81395ab7>] __aa_labelset_update_subtree+0x687/0x820 [13838.920249] [<ffffffff811b332d>] ? kzfree+0x2d/0x40 [13838.920254] [<ffffffff8138897b>] aa_replace_profiles+0x59b/0xb70 [13838.920259] [<ffffffff811ecf4e>] ? __kmalloc+0x22e/0x250 [13838.920263] [<ffffffff8137d69f>] policy_update+0x9f/0x1f0 [13838.920267] [<ffffffff8137d803>] profile_replace+0x13/0x20 [13838.920272] [<ffffffff8120c9d8>] __vfs_write+0x18/0x40 [13838.920275] [<ffffffff8120d369>] vfs_write+0xa9/0x1a0 [13838.920279] [<ffffffff8120c2ff>] ? do_sys_open+0x1bf/0x2a0 [13838.920282] [<ffffffff8120e025>] SyS_write+0x55/0xc0 [13838.920288] [<ffffffff8182def2>] entry_SYSCALL_64_fastpath+0x16/0x71 [13838.920291] ---[ end trace a19473a0fd8d9556 ]--- [13838.920305] BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 [13838.920475] IP: [<ffffffff8139066f>] profile_cmp+0x2f/0x180 [13838.920582] PGD 128a7d067 PUD 12a6be067 PMD 0 [13838.920684] Oops: 0000 [#1] SMP [13838.920755] Modules linked in: binfmt_misc nf_conntrack_ftp nf_conntrack_irc ip6t_REJECT nf_reject_ipv6 nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipt_REJECT nf_reject_ipv4 xt_NFLOG nfnetlink_log nfnetlink xt_tcpudp xt_pkttype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack iptable_filter ip_tables x_tables gpio_ich ipmi_devintf coretemp ipmi_ssif kvm dcdbas irqbypass i5000_edac serio_raw edac_core lpc_ich joydev input_leds i5k_amb ipmi_si 8250_fintek ipmi_msghandler shpchp mac_hid ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear ses enclosure amdkfd amd_iommu_v2 radeon i2c_algo_bit [13838.922791] ttm drm_kms_helper syscopyarea sysfillrect sysimgblt hid_generic fb_sys_fops usbhid uas e1000e ptp hid usb_storage psmouse drm megaraid_sas bnx2 pps_core pata_acpi fjes [13838.923223] CPU: 0 PID: 23590 Comm: apparmor_parser Tainted: G W 4.4.0-34-generic #53-Ubuntu [13838.923369] Hardware name: Dell Inc. PowerEdge 1950/0DT097, BIOS 2.7.0 10/30/2010 [13838.923485] task: ffff880035b86400 ti: ffff880128bfc000 task.ti: ffff880128bfc000 [13838.923599] RIP: 0010:[<ffffffff8139066f>] [<ffffffff8139066f>] profile_cmp+0x2f/0x180 [13838.923734] RSP: 0018:ffff880128bffcb0 EFLAGS: 00010086 [13838.923816] RAX: 0000000000000000 RBX: ffff8800c8d7d400 RCX: 0000000000000006 [13838.923916] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000009 [13838.924017] RBP: ffff880128bffcc0 R08: 000000000000000a R09: 0000000000000562 [13838.924025] R10: ffff8801289ba410 R11: 0000000000000562 R12: 0000000000000000 [13838.924025] R13: 000000000000000a R14: 0000000000000000 R15: ffff880034fdcf50 [13838.924025] FS: 00007f0e5cb28740(0000) GS:ffff88012fc00000(0000) knlGS:0000000000000000 [13838.924025] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [13838.924025] CR2: 0000000000000038 CR3: 0000000129458000 CR4: 00000000000006f0 [13838.924025] Stack: [13838.924025] 000000000000000b ffff880034fdcfa8 ffff880128bffd08 ffffffff81391843 [13838.924025] 0000000134db7fb0 ffff88010000000b ffff880034fdcf50 ffff8800c8d7d760 [13838.924025] ffff8801289ba3c8 ffff880034fdcf00 ffff8801289ba3c0 ffff880128bffd98 [13838.924025] Call Trace: [13838.924025] [<ffffffff81391843>] aa_vec_unique+0x163/0x240 [13838.924025] [<ffffffff81395ab7>] __aa_labelset_update_subtree+0x687/0x820 [13838.924025] [<ffffffff811b332d>] ? kzfree+0x2d/0x40 [13838.924025] [<ffffffff8138897b>] aa_replace_profiles+0x59b/0xb70 [13838.924025] [<ffffffff811ecf4e>] ? __kmalloc+0x22e/0x250 [13838.924025] [<ffffffff8137d69f>] policy_update+0x9f/0x1f0 [13838.924025] [<ffffffff8137d803>] profile_replace+0x13/0x20 [13838.924025] [<ffffffff8120c9d8>] __vfs_write+0x18/0x40 [13838.924025] [<ffffffff8120d369>] vfs_write+0xa9/0x1a0 [13838.924025] [<ffffffff8120c2ff>] ? do_sys_open+0x1bf/0x2a0 [13838.924025] [<ffffffff8120e025>] SyS_write+0x55/0xc0 [13838.924025] [<ffffffff8182def2>] entry_SYSCALL_64_fastpath+0x16/0x71 [13838.924025] Code: 90 55 48 85 ff 48 89 e5 41 54 53 49 89 f4 48 89 fb 0f 84 8b 00 00 00 4d 85 e4 0f 84 aa 00 00 00 48 83 7b 38 00 0f 84 c9 00 00 00 <49> 83 7c 24 38 00 0f 84 e8 00 00 00 48 83 7b 08 00 0f 84 07 01 [13838.924025] RIP [<ffffffff8139066f>] profile_cmp+0x2f/0x180 [13838.924025] RSP <ffff880128bffcb0> [13838.924025] CR2: 0000000000000038 [13838.924025] ---[ end trace a19473a0fd8d9557 ]--- ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-34-generic 4.4.0-34.53 ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15 Uname: Linux 4.4.0-34-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Aug 19 16:33 seq crw-rw---- 1 root audio 116, 33 Aug 19 16:33 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Fri Aug 19 20:32:38 2016 HibernationDevice: RESUME=UUID=5fd6de9a-b76c-49f1-b051-ebb1d40d4436 InstallationDate: Installed on 2016-08-17 (2 days ago) InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' MachineType: Dell Inc. PowerEdge 1950 PciMultimedia: ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-34-generic root=UUID=165f1d9c-dc78-412c-86a3-b96a8a94a97a ro RelatedPackageVersions: linux-restricted-modules-4.4.0-34-generic N/A linux-backports-modules-4.4.0-34-generic N/A linux-firmware 1.157.3 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/30/2010 dmi.bios.vendor: Dell Inc. dmi.bios.version: 2.7.0 dmi.board.name: 0DT097 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 23 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr2.7.0:bd10/30/2010:svnDellInc.:pnPowerEdge1950:pvr:rvnDellInc.:rn0DT097:rvrA00:cvnDellInc.:ct23:cvr: dmi.product.name: PowerEdge 1950 dmi.sys.vendor: Dell Inc. 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