Bug 205839
| Summary: | backport-iwlwifi: stable patch commit 55667441c84f causes dkms to hang system while connecting wifi | ||
|---|---|---|---|
| Product: | Networking | Reporter: | You-Sheng Yang (vicamo) |
| Component: | Wireless | Assignee: | networking_wireless (networking_wireless) |
| Status: | NEW --- | ||
| Severity: | high | CC: | linuxwifi, marcin.bajor, vicamo |
| Priority: | P1 | ||
| Hardware: | x86-64 | ||
| OS: | Linux | ||
| See Also: | https://launchpad.net/bugs/1855825 | ||
| Kernel Version: | 5.3.10 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: | proposed patch | ||
Created attachment 286255 [details] proposed patch This patch applies to latest version 8042 of backport-iwlwifi from https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/backport-iwlwifi.git . Please find https://launchpad.net/~vicamo/+archive/ubuntu/ppa-1855825 for prebuilt DKMS deb PPA. Additional Info: If this error already occurs. I am not able to use WiFi to connect to AP. (var_log_messages_wifi_connetion attached) I'm so sorry. Please ignore the above message. Wrong issue. |
Commit 55667441c84f ("net/flow_dissector: switch to siphash")[1] changes member field data type of `struct fq`, which backport-iwlwifi carries its own copy that is currently not yet updated in version 8042. As a result, it causes some unexpected behavior when skb_get_hash_perturb() is called, and in our cases it causes system hang while NetworkManager is trying to associate preconfigured WiFi base stations before logging in GDM. This affects all models of WiFi hw whenever this backport-iwlwifi driver is used. This can be reproduced on all kernel versions with this commit backported, namely kernels >= 5.3.10, 4.19.83, 4.14.153, 4.9.200, 4.4.200. For Ubuntu, it means Focal 5.4 kernels, Eoan >= 5.3.0-24, Disco >= 5.0.0-38, Bionic >= 4.15.0-73, OEM >= 4.15.0-1066, OEM-OSP1 >= 5.0.0-1032. It's already tracked in Ubuntu Launchpad in bug-1855825[2], as well as my personal DKMS packaging in GitLab[3]. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55667441c84fa5e0911a0aac44fb059c15ba6da2 [2]: https://bugs.launchpad.net/ubuntu/+source/backport-iwlwifi-dkms/+bug/1855825 [3]: https://gitlab.com/vicamo/backport-iwlwifi-dkms/issues/7