** 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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