Public bug reported:

My wlan1 interface relates to a ASUS PCE-N15 card ("RTL8188CE
802.11b/g/n WiFi Adapter", managed by the rtl8192ce kernel module).

I have this /etc/network/interfaces config for this card:

iface wlan1 inet dhcp
  wireless-essid $ESSID 
  wireless-key $WEP-key

When I tried to connect using "sudo ifup -v wlan1", the connection to
the access point was not established.

Using dmesg, I see some warning related to "warn_slowpath_common". Could
not reproduce these messages though ...

63881.908834] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
[63881.914345] ------------[ cut here ]------------
[63881.914377] WARNING: at /build/buildd/linux-3.8.0/net/mac80211/tx.c:766 
invoke_tx_handlers+0x881/0x1560 [mac80211]()
[63881.914380] Hardware name: MS-7636
[63881.914382] Modules linked in: rtllib_crypt_tkip(C) rtllib_crypt_ccmp(C) 
lib80211 carl9170 ath rtl8192ce joydev(F) arc4(F) rtlwifi rtl8192c_common usblp 
mac80211 snd_hda_codec_hdmi cfg80211 kvm_intel kvm btusb parport_pc(F) ppdev(F) 
snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_seq_midi(F) snd_hwdep(F) 
snd_seq_midi_event(F) snd_pcm(F) snd_rawmidi(F) snd_page_alloc(F) gpio_ich 
snd_seq(F) snd_seq_device(F) snd_timer(F) mac_hid snd(F) nvidia(POF) 
i7core_edac edac_core serio_raw(F) mei microcode(F) soundcore(F) lpc_ich 
dm_multipath(F) scsi_dh(F) f71882fg rfcomm coretemp bnep binfmt_misc(F) 
bluetooth lp(F) parport(F) dm_crypt(F) raid10(F) raid456(F) async_memcpy(F) 
async_raid6_recov(F) async_pq(F) async_xor(F) async_tx(F) raid6_pq(F) raid0(F) 
multipath(F) linear(F) dm_raid45 xor(F) dm_mirror(F) dm_region_hash(F) 
dm_log(F) usb_storage(F) pata_acpi raid1(F) hid_generic usbhid hid r8169 
pata_jmicron [last unloaded: rtl8192ce]
[63881.914466] Pid: 1998, comm: Xorg Tainted: PF        CIO 3.8.0-19-generic 
#30-Ubuntu
[63881.914468] Call Trace:
[63881.914471]  <IRQ>  [<ffffffff810587ef>] warn_slowpath_common+0x7f/0xc0
[63881.914483]  [<ffffffff8105884a>] warn_slowpath_null+0x1a/0x20
[63881.914504]  [<ffffffffa0f00cb1>] invoke_tx_handlers+0x881/0x1560 [mac80211]
[63881.914633]  [<ffffffffa02f3100>] ? _nv018283rm+0x17c/0x1eb [nvidia]
[63881.914748]  [<ffffffffa02f3301>] ? _nv018286rm+0x18/0x78 [nvidia]
[63881.914771]  [<ffffffffa0f01b0e>] ieee80211_tx+0x7e/0x100 [mac80211]
[63881.914793]  [<ffffffffa0f01c3a>] ieee80211_xmit+0xaa/0x100 [mac80211]
[63881.914814]  [<ffffffffa0f02405>] ieee80211_subif_start_xmit+0x445/0xe80 
[mac80211]
[63881.914822]  [<ffffffff815ca4b8>] dev_hard_start_xmit+0x278/0x4f0
[63881.914828]  [<ffffffff815e737e>] sch_direct_xmit+0x10e/0x1e0
[63881.914833]  [<ffffffff815cab37>] dev_queue_xmit+0x177/0x440
[63881.914838]  [<ffffffff815d2625>] neigh_resolve_output+0x125/0x200
[63881.914844]  [<ffffffff8165cb3c>] ip6_finish_output2+0x8c/0x360
[63881.914848]  [<ffffffff8165fc18>] ip6_finish_output+0x98/0xc0
[63881.914853]  [<ffffffff8165fc7c>] ip6_output+0x3c/0xb0
[63881.914858]  [<ffffffff8167e851>] mld_sendpack+0x171/0x2b0
[63881.914863]  [<ffffffff8167fe34>] mld_ifc_timer_expire+0x194/0x280
[63881.914868]  [<ffffffff8167fca0>] ? igmp6_mcf_seq_start+0x150/0x150
[63881.914874]  [<ffffffff81068116>] call_timer_fn+0x36/0x110
[63881.914878]  [<ffffffff8167fca0>] ? igmp6_mcf_seq_start+0x150/0x150
[63881.914883]  [<ffffffff81069d46>] run_timer_softirq+0x1f6/0x2a0
[63881.914889]  [<ffffffff81060f0f>] __do_softirq+0xcf/0x200
[63881.914895]  [<ffffffff816d4c5c>] call_softirq+0x1c/0x30
[63881.914902]  [<ffffffff81016555>] do_softirq+0x75/0xb0
[63881.914906]  [<ffffffff810611a5>] irq_exit+0xa5/0xb0
[63881.914911]  [<ffffffff816d54f3>] do_IRQ+0x63/0xe0
[63881.914916]  [<ffffffff816cb4ed>] common_interrupt+0x6d/0x6d
[63881.914918]  <EOI> 
[63881.914921] ---[ end trace d9e55971fc8c71c9 ]---
[63881.914924] ------------[ cut here ]------------
[63881.914944] WARNING: at /build/buildd/linux-3.8.0/net/mac80211/tx.c:55 
invoke_tx_handlers+0xe30/0x1560 [mac80211]()
[63881.914947] Hardware name: MS-7636
[63881.914948] Modules linked in: rtllib_crypt_tkip(C) rtllib_crypt_ccmp(C) 
lib80211 carl9170 ath rtl8192ce joydev(F) arc4(F) rtlwifi rtl8192c_common usblp 
mac80211 snd_hda_codec_hdmi cfg80211 kvm_intel kvm btusb parport_pc(F) ppdev(F) 
snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_seq_midi(F) snd_hwdep(F) 
snd_seq_midi_event(F) snd_pcm(F) snd_rawmidi(F) snd_page_alloc(F) gpio_ich 
snd_seq(F) snd_seq_device(F) snd_timer(F) mac_hid snd(F) nvidia(POF) 
i7core_edac edac_core serio_raw(F) mei microcode(F) soundcore(F) lpc_ich 
dm_multipath(F) scsi_dh(F) f71882fg rfcomm coretemp bnep binfmt_misc(F) 
bluetooth lp(F) parport(F) dm_crypt(F) raid10(F) raid456(F) async_memcpy(F) 
async_raid6_recov(F) async_pq(F) async_xor(F) async_tx(F) raid6_pq(F) raid0(F) 
multipath(F) linear(F) dm_raid45 xor(F) dm_mirror(F) dm_region_hash(F) 
dm_log(F) usb_storage(F) pata_acpi raid1(F) hid_generic usbhid hid r8169 
pata_jmicron [last unloaded: rtl8192ce]
[63881.915021] Pid: 1998, comm: Xorg Tainted: PF       WCIO 3.8.0-19-generic 
#30-Ubuntu
[63881.915023] Call Trace:
[63881.915025]  <IRQ>  [<ffffffff810587ef>] warn_slowpath_common+0x7f/0xc0
[63881.915033]  [<ffffffff8105884a>] warn_slowpath_null+0x1a/0x20
[63881.915053]  [<ffffffffa0f01260>] invoke_tx_handlers+0xe30/0x1560 [mac80211]
[63881.915169]  [<ffffffffa02f3100>] ? _nv018283rm+0x17c/0x1eb [nvidia]
[63881.915191]  [<ffffffffa0f01b0e>] ieee80211_tx+0x7e/0x100 [mac80211]
[63881.915212]  [<ffffffffa0f01c3a>] ieee80211_xmit+0xaa/0x100 [mac80211]
[63881.915233]  [<ffffffffa0f02405>] ieee80211_subif_start_xmit+0x445/0xe80 
[mac80211]
[63881.915240]  [<ffffffff815ca4b8>] dev_hard_start_xmit+0x278/0x4f0
[63881.915246]  [<ffffffff815e737e>] sch_direct_xmit+0x10e/0x1e0
[63881.915250]  [<ffffffff815cab37>] dev_queue_xmit+0x177/0x440
[63881.915255]  [<ffffffff815d2625>] neigh_resolve_output+0x125/0x200
[63881.915260]  [<ffffffff8165cb3c>] ip6_finish_output2+0x8c/0x360
[63881.915265]  [<ffffffff8165fc18>] ip6_finish_output+0x98/0xc0
[63881.915270]  [<ffffffff8165fc7c>] ip6_output+0x3c/0xb0
[63881.915274]  [<ffffffff8167e851>] mld_sendpack+0x171/0x2b0
[63881.915279]  [<ffffffff8167fe34>] mld_ifc_timer_expire+0x194/0x280
[63881.915284]  [<ffffffff8167fca0>] ? igmp6_mcf_seq_start+0x150/0x150
[63881.915289]  [<ffffffff81068116>] call_timer_fn+0x36/0x110
[63881.915293]  [<ffffffff8167fca0>] ? igmp6_mcf_seq_start+0x150/0x150
[63881.915298]  [<ffffffff81069d46>] run_timer_softirq+0x1f6/0x2a0
[63881.915304]  [<ffffffff81060f0f>] __do_softirq+0xcf/0x200
[63881.915308]  [<ffffffff816d4c5c>] call_softirq+0x1c/0x30
[63881.915314]  [<ffffffff81016555>] do_softirq+0x75/0xb0
[63881.915318]  [<ffffffff810611a5>] irq_exit+0xa5/0xb0
[63881.915323]  [<ffffffff816d54f3>] do_IRQ+0x63/0xe0
[63881.915327]  [<ffffffff816cb4ed>] common_interrupt+0x6d/0x6d
[63881.915329]  <EOI> 
[63881.915332] ---[ end trace d9e55971fc8c71ca ]---
[63881.915339] ------------[ cut here ]------------
[63881.915347] WARNING: at 
/build/buildd/linux-3.8.0/include/net/mac80211.h:1554 
rtl_get_tcb_desc+0x40c/0x590 [rtlwifi]()
[63881.915349] Hardware name: MS-7636
[63881.915351] Modules linked in: rtllib_crypt_tkip(C) rtllib_crypt_ccmp(C) 
lib80211 carl9170 ath rtl8192ce joydev(F) arc4(F) rtlwifi rtl8192c_common usblp 
mac80211 snd_hda_codec_hdmi cfg80211 kvm_intel kvm btusb parport_pc(F) ppdev(F) 
snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_seq_midi(F) snd_hwdep(F) 
snd_seq_midi_event(F) snd_pcm(F) snd_rawmidi(F) snd_page_alloc(F) gpio_ich 
snd_seq(F) snd_seq_device(F) snd_timer(F) mac_hid snd(F) nvidia(POF) 
i7core_edac edac_core serio_raw(F) mei microcode(F) soundcore(F) lpc_ich 
dm_multipath(F) scsi_dh(F) f71882fg rfcomm coretemp bnep binfmt_misc(F) 
bluetooth lp(F) parport(F) dm_crypt(F) raid10(F) raid456(F) async_memcpy(F) 
async_raid6_recov(F) async_pq(F) async_xor(F) async_tx(F) raid6_pq(F) raid0(F) 
multipath(F) linear(F) dm_raid45 xor(F) dm_mirror(F) dm_region_hash(F) 
dm_log(F) usb_storage(F) pata_acpi raid1(F) hid_generic usbhid hid r8169 
pata_jmicron [last unloaded: rtl8192ce]
[63881.915423] Pid: 1998, comm: Xorg Tainted: PF       WCIO 3.8.0-19-generic 
#30-Ubuntu
[63881.915425] Call Trace:
[63881.915427]  <IRQ>  [<ffffffff810587ef>] warn_slowpath_common+0x7f/0xc0
[63881.915435]  [<ffffffff8105884a>] warn_slowpath_null+0x1a/0x20
[63881.915442]  [<ffffffffa01c79ac>] rtl_get_tcb_desc+0x40c/0x590 [rtlwifi]
[63881.915449]  [<ffffffffa027f6b4>] rtl92ce_tx_fill_desc+0x1c4/0x740 
[rtl8192ce]
[63881.915455]  [<ffffffff81363f60>] ? swiotlb_map_sg+0x10/0x10
[63881.915464]  [<ffffffffa01cec14>] rtl_pci_tx+0x194/0x410 [rtlwifi]
[63881.915472]  [<ffffffffa01ca68e>] rtl_op_tx+0xae/0xb0 [rtlwifi]
[63881.915493]  [<ffffffffa0eff855>] __ieee80211_tx+0x125/0x350 [mac80211]
[63881.915514]  [<ffffffffa0f01b5f>] ieee80211_tx+0xcf/0x100 [mac80211]
[63881.915535]  [<ffffffffa0f01c3a>] ieee80211_xmit+0xaa/0x100 [mac80211]
[63881.915556]  [<ffffffffa0f02405>] ieee80211_subif_start_xmit+0x445/0xe80 
[mac80211]
[63881.915562]  [<ffffffff815ca4b8>] dev_hard_start_xmit+0x278/0x4f0
[63881.915568]  [<ffffffff815e737e>] sch_direct_xmit+0x10e/0x1e0
[63881.915572]  [<ffffffff815cab37>] dev_queue_xmit+0x177/0x440
[63881.915577]  [<ffffffff815d2625>] neigh_resolve_output+0x125/0x200
[63881.915582]  [<ffffffff8165cb3c>] ip6_finish_output2+0x8c/0x360
[63881.915587]  [<ffffffff8165fc18>] ip6_finish_output+0x98/0xc0
[63881.915592]  [<ffffffff8165fc7c>] ip6_output+0x3c/0xb0
[63881.915596]  [<ffffffff8167e851>] mld_sendpack+0x171/0x2b0
[63881.915601]  [<ffffffff8167fe34>] mld_ifc_timer_expire+0x194/0x280
[63881.915606]  [<ffffffff8167fca0>] ? igmp6_mcf_seq_start+0x150/0x150
[63881.915610]  [<ffffffff81068116>] call_timer_fn+0x36/0x110
[63881.915614]  [<ffffffff8167fca0>] ? igmp6_mcf_seq_start+0x150/0x150
[63881.915619]  [<ffffffff81069d46>] run_timer_softirq+0x1f6/0x2a0
[63881.915624]  [<ffffffff81060f0f>] __do_softirq+0xcf/0x200
[63881.915629]  [<ffffffff816d4c5c>] call_softirq+0x1c/0x30
[63881.915634]  [<ffffffff81016555>] do_softirq+0x75/0xb0
[63881.915639]  [<ffffffff810611a5>] irq_exit+0xa5/0xb0
[63881.915643]  [<ffffffff816d54f3>] do_IRQ+0x63/0xe0
[63881.915647]  [<ffffffff816cb4ed>] common_interrupt+0x6d/0x6d
[63881.915649]  <EOI> 
[63881.915652] ---[ end trace d9e55971fc8c71cb ]---

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-extra-3.8.0-19-generic 3.8.0-19.30
ProcVersionSignature: Ubuntu 3.8.0-19.30-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  jens       3829 F.... pulseaudio
CRDA:
 country DE:
        (2400 - 2483 @ 40), (N/A, 20)
        (5150 - 5250 @ 40), (N/A, 20), NO-OUTDOOR
        (5250 - 5350 @ 40), (N/A, 20), NO-OUTDOOR, DFS
        (5470 - 5725 @ 40), (N/A, 26), DFS
Date: Thu May  9 20:55:51 2013
HibernationDevice: RESUME=UUID=e107f0f3-954d-4e76-a24a-12956cf3df04
MachineType: MSI MS-7636
MarkForUpload: True
ProcEnviron:
 LANGUAGE=
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcFB:
 
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-19-generic 
root=/dev/mapper/encrypted--container-rootfs ro quiet splash
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-3.8.0-19-generic N/A
 linux-backports-modules-3.8.0-19-generic  N/A
 linux-firmware                            1.106
SourcePackage: linux
StagingDrivers: rtllib_crypt_tkip rtllib_crypt_ccmp
UpgradeStatus: Upgraded to raring on 2013-05-05 (4 days ago)
dmi.bios.date: 01/08/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V1.4
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: H55M-E33(MS-7636)
dmi.board.vendor: MSI
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 1.0
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrV1.4:bd01/08/2010:svnMSI:pnMS-7636:pvr1.0:rvnMSI:rnH55M-E33(MS-7636):rvr1.0:cvnMSI:ct3:cvr1.0:
dmi.product.name: MS-7636
dmi.product.version: 1.0
dmi.sys.vendor: MSI

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug raring staging

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https://bugs.launchpad.net/bugs/1178385

Title:
  When trying to connect to an AP using an ASUS PCE-N15 wireless card,
  the kernel prints "warn_slowpath_common"

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