Public bug reported:
SRU Justification:
------------------
Impact:
Kernel freezes/panic when running wireless tests
Test case:
1. Create a wireless soft-ap/station upon reboot.
2. Install Checkbox plano and :
$ sudo snap install --devmode checkbox-plano
3. Run below wifi-ap test case
$ checkbox-plano.checkbox-cli run .*device
.*wireless/caracalla-wifi_ap_.*wlan0_auto
4. Upon 3-4 iteraions, observed kernel crash as below,
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff810a63df>] exit_creds+0x1f/0x50
PGD 0
Oops: 0002 [#1] SMP
CPU: 0 PID: 6502 Comm: rmmod Tainted: G OE 4.4.0-128-generic
#154-Ubuntu
Hardware name: Dell Inc. Edge Gateway 3003/ , BIOS 01.00.00
04/17/2017
Stack:
ffff88007392e600 ffff880075847dc0 ffffffff8108160a 0000000000000000
ffff88007392e600 ffff880075847de8 ffffffff810a484b ffff880076127000
ffff88003cd3a800 ffff880074f12a00 ffff880075847e28 ffffffffc09bed15
Call Trace:
[<ffffffff8108160a>] __put_task_struct+0x5a/0x140
[<ffffffff810a484b>] kthread_stop+0x10b/0x110
[<ffffffffc09bed15>] rsi_disconnect+0x2f5/0x300 [ven_rsi_sdio]
[<ffffffff81578bcb>] ? __pm_runtime_resume+0x5b/0x80
[<ffffffff816f0918>] sdio_bus_remove+0x38/0x100
[<ffffffff8156cc64>] __device_release_driver+0xa4/0x150
[<ffffffff8156d7a5>] driver_detach+0xb5/0xc0
[<ffffffff8156c6c5>] bus_remove_driver+0x55/0xd0
[<ffffffff8156dfbc>] driver_unregister+0x2c/0x50
[<ffffffff816f0b8a>] sdio_unregister_driver+0x1a/0x20
[<ffffffffc09bf0f5>] rsi_module_exit+0x15/0x30 [ven_rsi_sdio]
[<ffffffff8110cad8>] SyS_delete_module+0x1b8/0x210
[<ffffffff81851dc8>] entry_SYSCALL_64_fastpath+0x1c/0xbb
Fix:
kthread_stop() is taking care of wait_for_completion() by default.
No need of taking care separately.
Issue is resolved by removing wait_for_completion() from rsi_disconnect().
Regression Petential:
Ran Step 3 in 30-times. Didn't see any kernel panic.
This bug is for tracking purposes only, please don't triage.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: xenial
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https://bugs.launchpad.net/bugs/1777858
Title:
Redpine: Observed kernel panic while running wireless regressions
tests
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