ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
=============================
WARNING: suspicious RCU usage
syzkaller #0 Not tainted
-----------------------------
net/wireless/scan.c:1845 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
5 locks held by kworker/u4:6/4333:
 #0: 
ffff888016c79138
 (
(wq_completion)events_unbound
){+.+.}-{0:0}
, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: 
ffffc900046dfd00
 (
(work_completion)(&rdev->wiphy_work)
){+.+.}-{0:0}
, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: 
ffff88807ab28688
 (
&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5319 [inline]
&rdev->wiphy.mtx){+.+.}-{3:3}, at: cfg80211_wiphy_work+0x31/0x260 net/wireless/core.c:420
 #3: 
ffff88802a3f8d40
 (&wdev->mtx
){+.+.}-{3:3}
, at: sdata_lock net/mac80211/ieee80211_i.h:1036 [inline]
, at: ieee80211_ibss_work+0xa8/0x10f0 net/mac80211/ibss.c:1685
 #4: ffff88807ab28168
 (&rdev->bss_lock
){+...}-{2:2}
, at: spin_lock_bh include/linux/spinlock.h:369 [inline]
, at: cfg80211_bss_update+0x80/0x21a0 net/wireless/scan.c:1820

stack backtrace:
CPU: 1 PID: 4333 Comm: kworker/u4:6 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: events_unbound cfg80211_wiphy_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 cfg80211_bss_update+0x95e/0x21a0 net/wireless/scan.c:1845
 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2552 [inline]
 cfg80211_inform_bss_frame_data+0x88d/0x1ed0 net/wireless/scan.c:2585
 __ieee80211_sta_join_ibss+0xb23/0x1300 net/mac80211/ibss.c:389
 ieee80211_sta_create_ibss+0x2c3/0x440 net/mac80211/ibss.c:1351
 ieee80211_sta_find_ibss net/mac80211/ibss.c:1481 [inline]
 ieee80211_ibss_work+0xdda/0x10f0 net/mac80211/ibss.c:1710
 cfg80211_wiphy_work+0x224/0x260 net/wireless/core.c:433
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>

=============================
WARNING: suspicious RCU usage
syzkaller #0 Not tainted
-----------------------------
net/wireless/scan.c:1848 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
5 locks held by kworker/u4:6/4333:
 #0: 
ffff888016c79138
 (
(wq_completion)events_unbound
){+.+.}-{0:0}
, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
 #1: 
ffffc900046dfd00
 ((work_completion)(&rdev->wiphy_work)
){+.+.}-{0:0}
, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
 #2: 
ffff88807ab28688
 (
&rdev->wiphy.mtx
){+.+.}-{3:3}
, at: wiphy_lock include/net/cfg80211.h:5319 [inline]
, at: cfg80211_wiphy_work+0x31/0x260 net/wireless/core.c:420
 #3: ffff88802a3f8d40
 (&wdev->mtx
){+.+.}-{3:3}
, at: sdata_lock net/mac80211/ieee80211_i.h:1036 [inline]
, at: ieee80211_ibss_work+0xa8/0x10f0 net/mac80211/ibss.c:1685
 #4: 
ffff88807ab28168
 (
&rdev->bss_lock
){+...}-{2:2}
, at: spin_lock_bh include/linux/spinlock.h:369 [inline]
, at: cfg80211_bss_update+0x80/0x21a0 net/wireless/scan.c:1820

stack backtrace:
CPU: 1 PID: 4333 Comm: kworker/u4:6 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: events_unbound cfg80211_wiphy_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 cfg80211_bss_update+0x987/0x21a0 net/wireless/scan.c:1848
 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2552 [inline]
 cfg80211_inform_bss_frame_data+0x88d/0x1ed0 net/wireless/scan.c:2585
 __ieee80211_sta_join_ibss+0xb23/0x1300 net/mac80211/ibss.c:389
 ieee80211_sta_create_ibss+0x2c3/0x440 net/mac80211/ibss.c:1351
 ieee80211_sta_find_ibss net/mac80211/ibss.c:1481 [inline]
 ieee80211_ibss_work+0xdda/0x10f0 net/mac80211/ibss.c:1710
 cfg80211_wiphy_work+0x224/0x260 net/wireless/core.c:433
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>