Random WiFi Crashes
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  1. #1
    Join Date
    Nov 2010

    Random WiFi Crashes

    I recently installed 27, my WiFi seems to crash after a period of inactivity. Typically, it stops working after I come back to my machine in the morning having sat overnight. It's not set to sleep or hibernate when inactive and not on battery.

    Problem reporting lists this as reason:

    WARNING: CPU: 3 PID: 1125 at drivers/net/wireless/intel/iwlwifi/mvm/scan.c:1755 iwl_mvm_report_scan_aborted+0x1fb/0x210 [iwlmvm]
    In the problem details I see a ton of these messages:

    [58739.897019] iwlwifi 0000:02:00.0: DMA: Out of SW-IOMMU space for 4096 bytes
    [58739.897061] iwlwifi 0000:02:00.0: swiotlb buffer is full (sz: 4096 bytes)
    Googling these leads me to many old (5-6 years) issues, but nothing current.



    System Info:

    sudo inxi -Fxmz
    System:    Host: localhost.localdomain Kernel: 4.14.11-300.fc27.x86_64 x86_64 bits: 64 gcc: 7.2.1
               Desktop: Cinnamon 3.6.7  Distro: Fedora release 27 (Twenty Seven)
    Machine:   Device: laptop System: Dell product: Precision 7510 serial: <filter>
               Mobo: Dell model: 0M91XC v: A00 serial: <filter>
               UEFI [Legacy]: Dell v: 1.13.6 date: 06/21/2017
    Battery    BAT0: charge: 91.0 Wh 104.0% condition: 87.5/91.0 Wh (96%)
               model: Samsung SDI DELL TWCPG77 status: Full
    CPU:       Quad core Intel Core i7-6820HQ (-MT-MCP-) arch: Skylake-S rev.3 cache: 8192 KB
               flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 21696
               clock speeds: max: 3600 MHz 1: 2700 MHz 2: 2700 MHz 3: 2700 MHz 4: 2700 MHz 5: 2700 MHz
               6: 2700 MHz 7: 2700 MHz 8: 2700 MHz
    Memory:    Array-1 capacity: 64 GB devices: 4 EC: None
               Device-1: ChannelA-DIMM0 size: 16 GB speed: 2133 MT/s type: DDR4 part: HMA82GS6MFR8N-TF
               Device-2: ChannelB-DIMM0 size: 16 GB speed: 2133 MT/s type: DDR4 part: HMA82GS6MFR8N-TF
               Device-3: ChannelB-DIMM1 size: 16 GB speed: 2133 MT/s type: DDR4 part: HMA82GS6MFR8N-TF
               Device-4: ChannelA-DIMM1 size: 16 GB speed: 2133 MT/s type: DDR4 part: HMA82GS6MFR8N-TF
               Device-5: N/A size: N/A speed: N/A type: N/A part: N/A
               Device-6: N/A size: N/A speed: N/A type: N/A part: N/A
    Graphics:  Card: NVIDIA GM107GLM [Quadro M2000M] bus-ID: 01:00.0
               Display Server: X.org 1.19.6 driver: nvidia Resolution: 1920x1080@60.00hz
               OpenGL: renderer: Quadro M2000M/PCIe/SSE2 version: 4.6.0 NVIDIA 387.34 Direct Render: Yes
    Audio:     Card-1 NVIDIA Device 0fbc driver: snd_hda_intel bus-ID: 01:00.1
               Card-2 Intel Sunrise Point-H HD Audio driver: snd_hda_intel bus-ID: 00:1f.3
               Sound: Advanced Linux Sound Architecture v: k4.14.11-300.fc27.x86_64
    Network:   Card-1: Intel Ethernet Connection (2) I219-LM driver: e1000e v: 3.2.6-k bus-ID: 00:1f.6
               IF: enp0s31f6 state: down mac: <filter>
               Card-2: Intel Wireless 8260 driver: iwlwifi bus-ID: 02:00.0
               IF: wlp2s0 state: up mac: <filter>
    Drives:    HDD Total Size: 1756.4GB (8.0% used)
               ID-1: /dev/sda model: ST500LM021 size: 500.1GB temp: 30C
               ID-2: USB /dev/sdb model: BUP_Slim_Mac_SL size: 1000.2GB temp: 0C
               ID-3: /dev/nvme0n1 model: PM961_NVMe_SAMSUNG_256GB size: 256.1GB
    Partition: ID-1: / size: 49G used: 13G (27%) fs: ext4 dev: /dev/dm-0
               ID-2: /boot size: 976M used: 230M (26%) fs: ext4 dev: /dev/nvme0n1p3
               ID-3: /home size: 72G used: 15G (22%) fs: ext4 dev: /dev/dm-2
               ID-4: swap-1 size: 14.87GB used: 0.00GB (0%) fs: swap dev: /dev/dm-1
    RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
    Sensors:   System Temperatures: cpu: 45.0C mobo: N/A gpu: 0.0:43C
               Fan Speeds (in rpm): cpu: N/A
    Info:      Processes: 281 Uptime: 13 min Memory: 2376.8/64136.0MB
               Init: systemd runlevel: 5 Gcc sys: 7.2.1 Client: Shell (sudo) inxi: 2.3.53

  2. #2
    Join Date
    Nov 2010

    Re: Random WiFi Crashes

    Same thing again this morning. Tried restarting the network service to no avail.

  3. #3
    Join Date
    Dec 2012
    santa barbara, CA

    Re: Random WiFi Crashes

    If your wifi 2.4Ghz ? or 5Ghz ?
    switch it to the other one if you can, and see if the same thing happens.
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

  4. #4
    Join Date
    Nov 2010

    Re: Random WiFi Crashes

    You mean on the router or on my machine? I pulled up the settings for the wifi connection, but I cannot locate anywhere to actually change the band it's using.

  5. #5
    Join Date
    Nov 2010

    Re: Random WiFi Crashes

    Latest kernel update seems to have fixed...it's been running for 48 hours without issues...fingers crossed.

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