group.of.nepali.translators team mailing list archive

[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1813869

Title:
  Redpine: Driver crash with network-manager 1.10 and above

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  New

Bug description:
  SRU Justification:
  ------------------

  Impact: 
  -------
        Kernel crash upon inserting Redpine driver

  Test case:
  ----------
        1) Install network-manager v(1.10) snap.
        2) Insert Redpine modules.
        3) Observe the behavior.

  Result:
  -------
         Redpine driver crashes the entire kernel and below is the crash log.
         ... skipping ...
         [ 49.130185] BUG: unable to handle kernel NULL pointer dereference at 0000000000000134
         [ 49.138969] IP: [<ffffffffc0517c03>] rsi_prepare_mgmt_desc+0xd3/0x2d0 [ven_rsi_91x]
         [ 49.244030] CPU: 0 PID: 31 Comm: kworker/u4:1 Not tainted 4.4.0-139-generic #165-Ubuntu
         [ 49.252988] Hardware name: Dell Inc. Edge Gateway 3001/, BIOS 01.00.00 04/17/2017
         [ 49.261374] Workqueue: rsi_scan_worker rsi_scan_start [ven_rsi_91x]
         [ 49.268385] task: ffff880078538cc0 ti: ffff8800785e4000 task.ti: ffff8800785e4000
         [ 49.276765] rsi_prepare_mgmt_desc+0xd3/0x2d0 [ven_rsi_91x]
         [ 49.387307] [<ffffffffc0516457>] rsi_send_probe_request+0x2c7/0x350 [ven_rsi_91x]
         [ 49.395784] [<ffffffffc0516702>] rsi_scan_start+0x222/0x380 [ven_rsi_91x]
         [ 49.403486] [<ffffffff818530c1>] ? __schedule+0x301/0x7f0
         [ 49.409633] [<ffffffff8109ee4b>] process_one_work+0x16b/0x490
         [ 49.416164] [<ffffffff8109f1bb>] worker_thread+0x4b/0x4d0
         [ 49.422306] [<ffffffff8109f170>] ? process_one_work+0x490/0x490
         [ 49.429032] [<ffffffff810a5587>] kthread+0xe7/0x100
         [ 49.434589] [<ffffffff818530c1>] ? __schedule+0x301/0x7f0
         [ 49.440731] [<ffffffff810a54a0>] ? kthread_create_on_node+0x1e0/0x1e0
         [ 49.448042] [<ffffffff81857bf5>] ret_from_fork+0x55/0x80
         [ 49.454086] [<ffffffff810a54a0>] ? kthread_create_on_node+0x1e0/0x1e0     

  Root cause analysis:
  --------------------
         In nm-1.10 and above versions, MAC spoof is enabled by default. In Redpine
         driver, this handling is missed. Hence, Added the fix for the same.

  Fix:
  ----
         Copied the Custom MAC address into driver global structure.

  Regression Petential:
  ---------------------
          This is a very direct issue Since the driver is crashing upon inserting the
          modules. we ran the multiple times insertion and deletion of modules and connected
          to third-party AP, did data transfer.

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