Verified on 5.17.0-1025 5.19.0-27 ** Tags removed: verification-needed-jammy verification-needed-kinetic ** Tags added: verification-done-jammy verification-done-kinetic
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-oem-5.17 in Ubuntu. https://bugs.launchpad.net/bugs/1995041 Title: Fix ath11k deadlock on WCN6855 Status in HWE Next: In Progress Status in linux package in Ubuntu: Fix Released Status in linux-oem-5.17 package in Ubuntu: Invalid Status in linux-oem-6.0 package in Ubuntu: Invalid Status in linux source package in Jammy: Fix Committed Status in linux-oem-5.17 source package in Jammy: Fix Committed Status in linux-oem-6.0 source package in Jammy: Fix Committed Status in linux source package in Kinetic: Fix Committed Status in linux-oem-5.17 source package in Kinetic: Invalid Status in linux-oem-6.0 source package in Kinetic: Invalid Bug description: [Impact] ath11k is in deadlock when stress reboot or suspend on WCN6855. sometimes kernel hang. Aug 19 01:29:28 Thor-P3-AMD-2 kernel: Call Trace: Aug 19 01:29:28 Thor-P3-AMD-2 kernel: <TASK> Aug 19 01:29:28 Thor-P3-AMD-2 kernel: __schedule+0x240/0x5a0 Aug 19 01:29:28 Thor-P3-AMD-2 kernel: ? resched_curr+0x52/0xc0 Aug 19 01:29:28 Thor-P3-AMD-2 kernel: schedule+0x55/0xd0 Aug 19 01:29:28 Thor-P3-AMD-2 kernel: schedule_timeout+0x115/0x150 Aug 19 01:29:28 Thor-P3-AMD-2 kernel: ? raw_spin_rq_unlock+0x10/0x30 Aug 19 01:29:28 Thor-P3-AMD-2 kernel: ? try_to_wake_up+0x211/0x600 Aug 19 01:29:28 Thor-P3-AMD-2 kernel: ? ath11k_ce_send+0x17a/0x2e0 [ath11k] Aug 19 01:29:28 Thor-P3-AMD-2 kernel: wait_for_completion+0x8b/0xf0 Aug 19 01:29:28 Thor-P3-AMD-2 kernel: __flush_work.isra.0+0x171/0x270 Aug 19 01:29:28 Thor-P3-AMD-2 kernel: ? flush_workqueue_prep_pwqs+0x140/0x140 Aug 19 01:29:28 Thor-P3-AMD-2 kernel: __cancel_work_timer+0x11b/0x1a0 Aug 19 01:29:28 Thor-P3-AMD-2 kernel: ? ath11k_mac_config_mon_status_default+0xcc/0x170 [ath11k] Aug 19 01:29:28 Thor-P3-AMD-2 kernel: cancel_work_sync+0x10/0x20 Aug 19 01:29:28 Thor-P3-AMD-2 kernel: ath11k_mac_op_stop+0x9f/0x1e0 [ath11k] Aug 19 01:29:28 Thor-P3-AMD-2 kernel: drv_stop+0x45/0x110 [mac80211] [Fix] Fix this by switching from using regulatory_set_wiphy_regd_sync() to regulatory_set_wiphy_regd(). Now cfg80211 will schedule another workqueue which handles the locking on it's own. So the ath11k workqueue can simply exit without taking any locks, avoiding the deadlock. [Test] Verified on hardware, stress reboot and suspend 30 times OK. [Where problems could occur] It may break ath11k wifi driver. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1995041/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
