Greg Kroah-Hartman, responsible for maintaining the stable branch of the Linux kernel, has released the significant version 6.6.6, which includes a single change affecting the cfg80211 wireless stack. This change reverts a bug fix added in release 6.6.5 that caused regressions due to another related commit not being carried over from branch 6.7 along with the fix. A similar rollback of the fix is proposed in version 6.1.67.
The regressive change led to deadlocks in user-space network managers. As a result, network manager processes would freeze during reboots, shutdowns, or sleep mode. For instance, the issue caused freezes when attempting to stop the NetworkManage, iwd, and wpa_supplicant services after updating the kernel to version 6.6.5 or 6.1.66. Additionally, after installing kernel 6.6.5, the brcmfmac WiFi driver for Broadcom wireless chips stopped functioning.
Interestingly, just a few days ago, a similar situation with an incomplete fix transfer to kernel 6.1.64 led to data corruption issues in the Ext4 filesystem, which resulted in the cancellation of the Debian 12.3 release.
Source: opennet.ru
