After upgrading for 14.04 to 15.10 (through 15.04), my system became unstable with random crashes.
System: Lenovo L440
lspci:
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05)
00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-V (rev 05)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d5)
00:1c.1 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #2 (rev d5)
00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 (rev d5)
00:1c.4 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #5 (rev d5)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation HM86 Express LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 05)
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 05)
02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8192EE PCIe Wireless Network Adapter
08:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader (rev 01)
Below you can find a traceback from a crash under kernel 4.2.0-19
[ 2390.551649] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 2390.551710] IP: [<ffffffffc07300cf>] rtl92ee_set_desc+0x2f/0x1d0 [rtl8192ee]
[ 2390.551758] PGD 0
[ 2390.551772] Oops: 0000 [#1] SMP
[ 2390.551795] Modules linked in: drbg ansi_cprng ctr ccm ip6table_filter ip6_tables iptable_filter ip_tables x_tables binfmt_misc rfcomm bnep nls_iso8859_1 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm uvcvideo crct10dif_pclmul crc32_pclmul videobuf2_vmalloc cryptd videobuf2_memops videobuf2_core v4l2_common arc4 joydev serio_raw rtl8192ee videodev btcoexist rtl_pci rtlwifi input_leds snd_hda_codec_hdmi lpc_ich mac80211 media snd_hda_codec_realtek snd_hda_codec_generic rtsx_pci_ms btusb btrtl cfg80211 btbcm memstick btintel bluetooth snd_hda_intel shpchp snd_hda_codec snd_hda_core snd_hwdep mei_me mei snd_pcm thinkpad_acpi ie31200_edac edac_core nvram snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer snd soundcore mac_hid parport_pc ppdev lp parport
[ 2390.552294] autofs4 hid_generic usbhid hid rtsx_pci_sdmmc i915 ahci e1000e psmouse rtsx_pci i2c_algo_bit libahci drm_kms_helper ptp pps_core drm wmi video
[ 2390.552393] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G W 4.2.0-19-generic #23-Ubuntu
[ 2390.552440] Hardware name: LENOVO 20ATCTO1WW/20ATCTO1WW, BIOS J4ET67WW(1.67) 08/13/2014
[ 2390.552485] task: ffff880119c9b700 ti: ffff880119cb0000 task.ti: ffff880119cb0000
[ 2390.552527] RIP: 0010:[<ffffffffc07300cf>] [<ffffffffc07300cf>] rtl92ee_set_desc+0x2f/0x1d0 [rtl8192ee]
[ 2390.552585] RSP: 0018:ffff88011f2838a8 EFLAGS: 00010046
[ 2390.552615] RAX: ffffffffc0732f60 RBX: 0000000000000000 RCX: 0000000000000007
[ 2390.552653] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff880034e406a0
[ 2390.552693] RBP: ffff88011f283900 R08: ffff88011f2838c4 R09: 0000160000000000
[ 2390.552733] R10: ffffea0002ad4180 R11: 0000000000000001 R12: ffff880034e406a0
[ 2390.552772] R13: 00000000000000a2 R14: ffff88004b4cbe00 R15: ffff880034e41440
[ 2390.552809] FS: 0000000000000000(0000) GS:ffff88011f280000(0000) knlGS:0000000000000000
[ 2390.552852] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2390.552882] CR2: 0000000000000000 CR3: 0000000002c0c000 CR4: 00000000001406e0
[ 2390.552920] Stack:
[ 2390.552933] ffffffffc0590fbf 0000000000000002 0000000000000000 0b80404001283900
[ 2390.552979] e3beecd6839eaf48 ffffffff81ceb500 0000000000000000 ffff88004b4cbe00
[ 2390.553026] ffff880034e406a0 ffff88004b4cbe00 ffff880034e41440 ffff88011f283b00
[ 2390.553072] Call Trace:
[ 2390.553087] <IRQ>
[ 2390.553104] [<ffffffffc0590fbf>] ? _rtl_pci_init_one_rxdesc+0x1df/0x240 [rtl_pci]
[ 2390.553147] [<ffffffffc05933a3>] _rtl_pci_rx_interrupt+0x4f3/0x790 [rtl_pci]
[ 2390.553189] [<ffffffff815db88e>] ? usb_hcd_link_urb_to_ep+0x1e/0xa0
[ 2390.553226] [<ffffffff8162556e>] ? prepare_transfer+0x11e/0x130
[ 2390.553260] [<ffffffff81626c1a>] ? xhci_queue_bulk_tx+0x35a/0x9e0
[ 2390.553297] [<ffffffff810bcaa8>] ? __wake_up+0x48/0x60
[ 2390.553327] [<ffffffffc0593819>] _rtl_pci_interrupt+0x1d9/0x3b1 [rtl_pci]
[ 2390.553368] [<ffffffff813da795>] ? find_next_bit+0x15/0x20
[ 2390.553402] [<ffffffff810d4204>] handle_irq_event_percpu+0x74/0x180
[ 2390.553437] [<ffffffff810d4359>] handle_irq_event+0x49/0x70
[ 2390.553468] [<ffffffff810d76d1>] handle_edge_irq+0x81/0x150
[ 2390.553496] [<ffffffff810172b5>] handle_irq+0x25/0x40
[ 2390.553523] [<ffffffff817f2def>] do_IRQ+0x4f/0xe0
[ 2390.553550] [<ffffffff817f0d6b>] common_interrupt+0x6b/0x6b
[ 2390.553579] [<ffffffff810b6411>] ? load_balance+0x181/0x960
[ 2390.553609] [<ffffffff810b63f9>] ? load_balance+0x169/0x960
[ 2390.553640] [<ffffffff810b775e>] rebalance_domains+0x22e/0x2a0
[ 2390.553670] [<ffffffff810b795e>] run_rebalance_domains+0x18e/0x1d0
[ 2390.553703] [<ffffffff8107f846>] __do_softirq+0xf6/0x250
[ 2390.553731] [<ffffffff8107fb13>] irq_exit+0xa3/0xb0
[ 2390.553757] [<ffffffff817f2ec6>] smp_apic_timer_interrupt+0x46/0x60
[ 2390.555471] [<ffffffff817f105b>] apic_timer_interrupt+0x6b/0x70
[ 2390.557217] <EOI>
[ 2390.557239] [<ffffffff81686fe0>] ? cpuidle_enter_state+0x130/0x270
[ 2390.560644] [<ffffffff81686fbb>] ? cpuidle_enter_state+0x10b/0x270
[ 2390.562380] [<ffffffff81687157>] cpuidle_enter+0x17/0x20
[ 2390.564117] [<ffffffff810bd472>] call_cpuidle+0x32/0x60
[ 2390.565809] [<ffffffff81687133>] ? cpuidle_select+0x13/0x20
[ 2390.567521] [<ffffffff810bd708>] cpu_startup_entry+0x268/0x320
[ 2390.569126] [<ffffffff8104d3d3>] start_secondary+0x183/0x1c0
[ 2390.570720] Code: 00 84 d2 74 14 84 c9 74 37 80 f9 02 0f 85 79 01 00 00 41 8b 00 89 46 30 c3 80 f9 06 0f 84 6b 01 00 00 80 f9 07 0f 85 60 01 00 00 <8b> 06 25 00 40 00 80 0d 18 20 00 00 89 06 41 8b 00 89 46 04 c3
[ 2390.574328] RIP [<ffffffffc07300cf>] rtl92ee_set_desc+0x2f/0x1d0 [rtl8192ee]
[ 2390.575953] RSP <ffff88011f2838a8>
[ 2390.577534] CR2: 0000000000000000
ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.2
ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
Uname: Linux 4.2.0-19-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: i3
Date: Wed Dec 16 14:33:04 2015
InstallationDate: Installed on 2014-11-19 (391 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to wily on 2015-11-21 (25 days ago)
VarLogDistupgradeAptclonesystemstate.tar.gz:
Error: command ['pkexec', 'cat', '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'] failed with exit code 127: polkit-agent-helper-1: error response to PolicyKit daemon: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: No session for cookie
Error executing command as another user: Not authorized
This incident has been reported.
VarLogDistupgradeTermlog:
---
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: olethros 1737 F.... pulseaudio
/dev/snd/controlC0: olethros 1737 F.... pulseaudio
CurrentDesktop: i3
DistroRelease: Ubuntu 15.10
HibernationDevice: RESUME=UUID=ce11a4e6-2c0c-4f92-875e-942b2bc77356
InstallationDate: Installed on 2014-11-19 (398 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
MachineType: LENOVO 20ATCTO1WW
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic.efi.signed root=UUID=aaaf9c33-5889-4c08-ad19-2e65be657e20 ro quiet splash crashkernel=384M-:128M crashkernel=384M-:128M vt.handoff=7
ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6
RelatedPackageVersions:
linux-restricted-modules-4.2.0-22-generic N/A
linux-backports-modules-4.2.0-22-generic N/A
linux-firmware 1.149.3
Tags: wily
Uname: Linux 4.2.0-22-generic x86_64
UpgradeStatus: Upgraded to wily on 2015-11-21 (31 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 08/13/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: J4ET67WW(1.67)
dmi.board.asset.tag: Not Available
dmi.board.name: 20ATCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50512 STD
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrJ4ET67WW(1.67):bd08/13/2014:svnLENOVO:pn20ATCTO1WW:pvrThinkPadL440:rvnLENOVO:rn20ATCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20ATCTO1WW
dmi.product.version: ThinkPad L440
dmi.sys.vendor: LENOVO
---
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: olethros 1737 F.... pulseaudio
/dev/snd/controlC0: olethros 1737 F.... pulseaudio
CurrentDesktop: i3
DistroRelease: Ubuntu 15.10
HibernationDevice: RESUME=UUID=ce11a4e6-2c0c-4f92-875e-942b2bc77356
InstallationDate: Installed on 2014-11-19 (398 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
MachineType: LENOVO 20ATCTO1WW
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic.efi.signed root=UUID=aaaf9c33-5889-4c08-ad19-2e65be657e20 ro quiet splash crashkernel=384M-:128M crashkernel=384M-:128M vt.handoff=7
ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6
RelatedPackageVersions:
linux-restricted-modules-4.2.0-22-generic N/A
linux-backports-modules-4.2.0-22-generic N/A
linux-firmware 1.149.3
Tags: wily
Uname: Linux 4.2.0-22-generic x86_64
UpgradeStatus: Upgraded to wily on 2015-11-21 (31 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 08/13/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: J4ET67WW(1.67)
dmi.board.asset.tag: Not Available
dmi.board.name: 20ATCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50512 STD
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrJ4ET67WW(1.67):bd08/13/2014:svnLENOVO:pn20ATCTO1WW:pvrThinkPadL440:rvnLENOVO:rn20ATCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20ATCTO1WW
dmi.product.version: ThinkPad L440
dmi.sys.vendor: LENOVO
This patch should fix the reported panic due to NULL dereference. Under low-memory conditions, it may not be possible to allocate a new skb. In that case, the code is supposed to reuse the old one. For the RTL8192EE, which has a unique descriptor buffer flow, the initialization of a buffer descriptor was missed.