** Bug watch added: Debian Bug tracker #901389
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901389

** Also affects: linux (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901389
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1733194

Title:
  kernel NULL pointer dereference in iwlmvm iwl_mvm_enable_txq

Status in Linux:
  Expired
Status in linux package in Ubuntu:
  Confirmed
Status in linux package in Debian:
  Unknown

Bug description:
  When in AP mode after some time, get this BUG:

  Nov 18 23:21:31 bifrost kernel: [18345.860393] BUG: unable to handle kernel 
NULL pointer dereference at 0000000000000070
  Nov 18 23:21:31 bifrost kernel: [18345.860552] IP: 
iwl_trans_pcie_txq_enable+0x62/0x440 [iwlwifi]
  Nov 18 23:21:31 bifrost kernel: [18345.860644] PGD 0
  Nov 18 23:21:31 bifrost kernel: [18345.860646] P4D 0
  Nov 18 23:21:31 bifrost kernel: [18345.860682]
  Nov 18 23:21:31 bifrost kernel: [18345.860747] Oops: 0002 [#1] SMP
  Nov 18 23:21:31 bifrost kernel: [18345.860800] Modules linked in: 
nfnetlink_queue nfnetlink_log nfnetlink dummy ufs qnx4 hfsplus hfs minix ntfs 
msdos jfs xfs ccm xfrm_user xfrm4_tunnel tunnel4 ipcomp xfrm_ipcomp esp4 ah4 
af_key xfrm_algo xt_policy xt_multiport ip6table_filter ip6_tables 
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat ipt_REJECT 
nf_reject_ipv4 xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack 
nf_conntrack iptable_filter nls_iso8859_1 cmdlinepart intel_spi_platform 
intel_spi spi_nor mtd arc4 intel_rapl intel_soc_dts_thermal intel_soc_dts_iosf 
intel_powerclamp coretemp kvm_intel bridge kvm stp llc iwlmvm irqbypass 
punit_atom_debug mac80211 intel_cstate snd_hda_codec_hdmi iwlwifi 
snd_hda_codec_realtek snd_hda_codec_generic cfg80211 btusb snd_hda_intel 
lpc_ich btrtl snd_hda_codec snd_intel_sst_acpi
  Nov 18 23:21:31 bifrost kernel: [18345.861897]  mei_txe snd_hda_core mei 
snd_hwdep shpchp snd_intel_sst_core snd_soc_sst_atom_hifi2_platform hci_uart 
snd_soc_sst_match snd_soc_core btbcm serdev snd_compress btqca ac97_bus btintel 
snd_pcm_dmaengine snd_pcm dw_dmac dw_dmac_core snd_timer bluetooth snd 
soundcore mac_hid intel_int0002_vgpio ecdh_generic spi_pxa2xx_platform 
rfkill_gpio pwm_lpss_platform pwm_lpss 8250_dw ib_iser rdma_cm iw_cm ib_cm 
ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi ip_tables x_tables 
autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor 
async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear i915 
drm_kms_helper crct10dif_pclmul igb syscopyarea sysfillrect crc32_pclmul 
sysimgblt fb_sys_fops dca ghash_clmulni_intel i2c_algo_bit cryptd ahci ptp drm 
pps_core libahci video
  Nov 18 23:21:31 bifrost kernel: [18345.862995]  i2c_hid hid sdhci_acpi sdhci
  Nov 18 23:21:31 bifrost kernel: [18345.863068] CPU: 1 PID: 1202 Comm: 
kworker/1:2 Tainted: G        W       4.13.0-16-generic #19-Ubuntu
  Nov 18 23:21:31 bifrost kernel: [18345.863203] Hardware name: NF541 
NF541/NF541, BIOS BAR1NA02 02/25/2016
  Nov 18 23:21:31 bifrost kernel: [18345.863326] Workqueue: events 
iwl_mvm_add_new_dqa_stream_wk [iwlmvm]
  Nov 18 23:21:31 bifrost kernel: [18345.863428] task: ffff96862c1c5800 
task.stack: ffffa98a817c0000
  Nov 18 23:21:31 bifrost kernel: [18345.863539] RIP: 
0010:iwl_trans_pcie_txq_enable+0x62/0x440 [iwlwifi]
  Nov 18 23:21:31 bifrost kernel: [18345.863635] RSP: 0018:ffffa98a817c3be0 
EFLAGS: 00010246
  Nov 18 23:21:31 bifrost kernel: [18345.863718] RAX: 00000000000009c4 RBX: 
000000000000001f RCX: 0000000000000000
  Nov 18 23:21:31 bifrost kernel: [18345.863824] RDX: 0000000000000000 RSI: 
000000000000001f RDI: 0000000000002710
  Nov 18 23:21:31 bifrost kernel: [18345.863932] RBP: ffffa98a817c3c30 R08: 
0000000000002710 R09: 0000000000000001
  Nov 18 23:21:31 bifrost kernel: [18345.864039] R10: 0000000000000000 R11: 
ffff9686344ce010 R12: 0000000000000000
  Nov 18 23:21:31 bifrost kernel: [18345.864145] R13: ffff96862c9d0018 R14: 
0000000000000000 R15: 0000000000000000
  Nov 18 23:21:31 bifrost kernel: [18345.864253] FS:  0000000000000000(0000) 
GS:ffff96863fc80000(0000) knlGS:0000000000000000
  Nov 18 23:21:31 bifrost kernel: [18345.864373] CS:  0010 DS: 0000 ES: 0000 
CR0: 0000000080050033
  Nov 18 23:21:31 bifrost kernel: [18345.864461] CR2: 0000000000000070 CR3: 
000000023068b000 CR4: 00000000001006e0
  Nov 18 23:21:31 bifrost kernel: [18345.864568] Call Trace:
  Nov 18 23:21:31 bifrost kernel: [18345.864633]  
iwl_mvm_enable_txq+0x212/0x3a0 [iwlmvm]
  Nov 18 23:21:31 bifrost kernel: [18345.864732]  
iwl_mvm_add_new_dqa_stream_wk+0x7e8/0x15e0 [iwlmvm]
  Nov 18 23:21:31 bifrost kernel: [18345.864843]  ? 
iwl_mvm_add_new_dqa_stream_wk+0x7e8/0x15e0 [iwlmvm]
  Nov 18 23:21:31 bifrost kernel: [18345.864945]  ? __switch_to+0x211/0x520
  Nov 18 23:21:31 bifrost kernel: [18345.865008]  ? put_prev_entity+0x23/0xf0
  Nov 18 23:21:31 bifrost kernel: [18345.865075]  process_one_work+0x1e7/0x410
  Nov 18 23:21:31 bifrost kernel: [18345.865143]  worker_thread+0x4a/0x410
  Nov 18 23:21:31 bifrost kernel: [18345.865204]  kthread+0x125/0x140
  Nov 18 23:21:31 bifrost kernel: [18345.865260]  ? process_one_work+0x410/0x410
  Nov 18 23:21:31 bifrost kernel: [18345.869337]  ? 
kthread_create_on_node+0x70/0x70
  Nov 18 23:21:31 bifrost kernel: [18345.873431]  ret_from_fork+0x25/0x30
  Nov 18 23:21:31 bifrost kernel: [18345.877527] Code: 4c 8b b4 c7 08 7e 00 00 
f0 48 0f ab 87 08 8e 00 00 73 0d 80 3d d6 3b 02 00 00 0f 84 a1 03 00 00 44 89 
c7 e8 21 2f 6b dc 4d 85 e4 <49> 89 46 70 0f 84 d9 02 00 00 41 0f b6 04 24 89 45 
b8 41 0f b6
  Nov 18 23:21:31 bifrost kernel: [18345.886085] RIP: 
iwl_trans_pcie_txq_enable+0x62/0x440 [iwlwifi] RSP: ffffa98a817c3be0
  Nov 18 23:21:31 bifrost kernel: [18345.890363] CR2: 0000000000000070
  Nov 18 23:21:31 bifrost kernel: [18345.894670] ---[ end trace 
128827eedfd09435 ]---
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 
k4.13.0-16-generic.
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.7-0ubuntu3.4
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', 
'/dev/snd/hwC0D2', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D1p', 
'/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  Card0.Amixer.info: Error: [Errno 2] No such file or directory
  Card0.Amixer.values: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 17.10
  HibernationDevice: RESUME=/dev/mapper/bifrost--vg-swap_1
  InstallationDate: Installed on 2017-02-18 (274 days ago)
  InstallationMedia: Ubuntu-Server 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.8)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub
   Bus 001 Device 002: ID 8087:07dc Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: NF541 NF541
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-16-generic.efi.signed 
root=/dev/mapper/hostname--vg-root ro
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-16-generic N/A
   linux-backports-modules-4.13.0-16-generic  N/A
   linux-firmware                             1.169
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  artful
  Uname: Linux 4.13.0-16-generic x86_64
  UnreportableReason: The report belongs to a package that is not installed.
  UpgradeStatus: Upgraded to artful on 2017-11-18 (0 days ago)
  UserGroups:
   
  _MarkForUpload: False
  dmi.bios.date: 02/25/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: BAR1NA02
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: NF541
  dmi.board.vendor: NF541
  dmi.board.version: 1.0
  dmi.chassis.type: 3
  dmi.chassis.vendor: NF541
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrBAR1NA02:bd02/25/2016:svnNF541:pnNF541:pvr1.0:rvnNF541:rnNF541:rvr1.0:cvnNF541:ct3:cvr1.0:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: NF541
  dmi.product.version: 1.0
  dmi.sys.vendor: NF541

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