Bug 205647

Summary: Wi-Fi cannot connect to network (regression, bisected)
Product: Networking Reporter: Nicholas Johnson (nicholas.johnson-opensource)
Component: OtherAssignee: Stephen Hemminger (stephen)
Status: NEW ---    
Severity: high    
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: next-20191122 Subsystem:
Regression: No Bisected commit-id:
Attachments: dmesg, sudo lspci -xxxx, .config, result of bisect

Description Nicholas Johnson 2019-11-25 07:23:24 UTC
Created attachment 286039 [details]
dmesg, sudo lspci -xxxx, .config, result of bisect

Marking as high severity as it directly impacts the user - the user will be wondering why they cannot connect to a wireless network.

Using Arch Linux
Using Linux next-20191122
Using Dell XPS 9370 (i7-8650U, Intel Wireless 8265 [8086:24fd])

Will attach in a zip file: dmesg, sudo lspci -xxxx, .config, result of bisect

At the end of the dmesg, you can see repeated failed attempts to connect - I could not get a single successful connection. On another kernel version (or same kernel version with the culprit patch reversed), on the same computer, the wireless comes straight up without any user intervention.

I have done a bisect. The result was:
6570bc79c0dfff0f228b7afd2de720fb4e84d61d is the first bad commit
commit 6570bc79c0dfff0f228b7afd2de720fb4e84d61d
Author: Alexander Lobakin <alobakin@dlink.ru>
Date:   Mon Oct 14 11:00:33 2019 +0300

    net: core: use listified Rx for GRO_NORMAL in napi_gro_receive()


:040000 040000 56eacee948f7d3f2e04b09d6af502116c2cdd492 96653f8053eb477d1c37afa3ffdea678ee2fa7bd M      net

I reverse applied the diff of this patch to a clean Linux next-20191122 and the regression disappeared.

I use Intel Wireless 8265 [8086:24fd] (iwlwifi.ko), but there were other network driver modules which were re-generated upon reversing the patch, also.

Can somebody else please reproduce / confirm this regression? I will notify the relevant people by replying to [0] in the mean time, but they probably should not revert it on the basis of testimony by a single person.