Public bug reported:
[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.
** Affects: hwe-next
Importance: Undecided
Assignee: AaronMa (mapengyu)
Status: In Progress
** Affects: linux (Ubuntu)
Importance: Undecided
Status: In Progress
** Affects: linux-oem-5.17 (Ubuntu)
Importance: Undecided
Status: In Progress
** Affects: linux-oem-6.0 (Ubuntu)
Importance: Undecided
Status: In Progress
** Affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: In Progress
** Affects: linux-oem-5.17 (Ubuntu Jammy)
Importance: Undecided
Status: In Progress
** Affects: linux-oem-6.0 (Ubuntu Jammy)
Importance: Undecided
Status: In Progress
** Affects: linux (Ubuntu Kinetic)
Importance: Undecided
Status: In Progress
** Affects: linux-oem-5.17 (Ubuntu Kinetic)
Importance: Undecided
Status: In Progress
** Affects: linux-oem-6.0 (Ubuntu Kinetic)
Importance: Undecided
Status: In Progress
** Tags: oem-priority originate-from-1981178 sutton
** Tags added: oem-priority originate-from-1981178 sutton
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Kinetic)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.17 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.0 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: hwe-next
Assignee: (unassigned) => AaronMa (mapengyu)
** Changed in: linux (Ubuntu Jammy)
Status: New => In Progress
** Changed in: linux (Ubuntu Kinetic)
Status: New => In Progress
** Changed in: linux (Ubuntu)
Status: New => In Progress
** Changed in: linux-oem-5.17 (Ubuntu)
Status: New => In Progress
** Changed in: linux-oem-5.17 (Ubuntu Jammy)
Status: New => In Progress
** Changed in: linux-oem-5.17 (Ubuntu Kinetic)
Status: New => In Progress
** Changed in: linux-oem-6.0 (Ubuntu)
Status: New => In Progress
** Changed in: linux-oem-6.0 (Ubuntu Jammy)
Status: New => In Progress
** Changed in: linux-oem-6.0 (Ubuntu Kinetic)
Status: New => In Progress
** Changed in: hwe-next
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1995041
Title:
Fix ath11k deadlock on WCN6855
Status in HWE Next:
In Progress
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.17 package in Ubuntu:
In Progress
Status in linux-oem-6.0 package in Ubuntu:
In Progress
Status in linux source package in Jammy:
In Progress
Status in linux-oem-5.17 source package in Jammy:
In Progress
Status in linux-oem-6.0 source package in Jammy:
In Progress
Status in linux source package in Kinetic:
In Progress
Status in linux-oem-5.17 source package in Kinetic:
In Progress
Status in linux-oem-6.0 source package in Kinetic:
In Progress
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
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