INFO: rcu detected stall in __cfg80211_wext

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-5.15	INFO: rcu detected stall in __cfg80211_wext_siwmode (2)	1				1	114d	114d	0/3	auto-obsoleted due to no activity on 2026/08/22 14:41
linux-5.15	INFO: rcu detected stall in __cfg80211_wext_siwmode	1				1	307d	307d	0/3	auto-obsoleted due to no activity on 2026/02/09 22:17
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1030 ticks this GP) idle=bef/1/0x4000000000000002 softirq=11389/11394 fqs=2328 
	(detected by 1, t=10506 jiffies, g=13841, q=1351)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5632 Comm: syz.1.303 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:172 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x60 kernel/kcov.c:206
Code: 48 8b 3d 80 01 12 0c 48 89 de 5b e9 a7 5f 44 00 00 00 cc cc 00 00 cc 48 8b 04 24 65 48 8b 0d 14 60 89 7e 65 8b 15 15 60 89 7e <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 34 16 00 00
RSP: 0018:ffffc90000007550 EFLAGS: 00000046
RAX: ffffffff8198602a RBX: ffff88805ed111e8 RCX: ffff88802a659dc0
RDX: 0000000000000102 RSI: 0000000000003090 RDI: 0000000000003090
RBP: 1ffff1100bda227d R08: ffff88805ed1165b R09: 1ffff1100bda22cb
R10: dffffc0000000000 R11: ffffed100bda22cc R12: ffff88805ed113e8
R13: 0000000000003090 R14: 0000000000000000 R15: 0000000000003090
FS:  00007f25788b56c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1151d29ff8 CR3: 000000007cd72000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __perf_event_account_interrupt+0x6a/0x280 kernel/events/core.c:9437
 __perf_event_overflow+0x9a/0x550 kernel/events/core.c:9484
 perf_swevent_overflow kernel/events/core.c:9601 [inline]
 perf_swevent_event+0x4b8/0x540 kernel/events/core.c:9639
 perf_tp_event+0x324/0xbe0 kernel/events/core.c:10057
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10031
 perf_trace_preemptirq_template+0x2aa/0x360 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 f2 0f 9d 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90000007b00 EFLAGS: 00000206
RAX: a6da319b9a559100 RBX: 1ffff92000000f64 RCX: a6da319b9a559100
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a43c0
RBP: ffffc90000007bd8 R08: ffffffff901ef0e7 R09: 1ffffffff203de1c
R10: dffffc0000000000 R11: fffffbfff203de1d R12: ffffffff8c323400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 ieee80211_iterate_active_interfaces_atomic+0x132/0x140 net/mac80211/util.c:831
 mac80211_hwsim_beacon+0x9b/0x180 drivers/net/wireless/mac80211_hwsim.c:1865
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4ea/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:finish_lock_switch+0x12f/0x290 kernel/sched/core.c:4804
Code: 83 c7 18 be ff ff ff ff e8 0e fb 6b 08 85 c0 74 46 4d 85 ff 75 62 0f 1f 44 00 00 48 89 df e8 c8 6a 75 08 e8 33 dd 2a 00 fb 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 48 89 df e8 2f 0e fe ff 43 80 3c 2c
RSP: 0018:ffffc900034bf038 EFLAGS: 00000286
RAX: a6da319b9a559100 RBX: ffff88802907d940 RCX: a6da319b9a559100
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a43c0
RBP: 1ffff11017207613 R08: ffffffff901ef0e7 R09: 1ffffffff203de1c
R10: dffffc0000000000 R11: fffffbfff203de1d R12: 1ffff110172075c1
R13: dffffc0000000000 R14: ffff8880b903ae08 R15: 0000000000000000
 finish_task_switch+0x12f/0x650 kernel/sched/core.c:4921
 context_switch kernel/sched/core.c:5052 [inline]
 __schedule+0x11cb/0x4350 kernel/sched/core.c:6395
 preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6571
 preempt_schedule+0xbc/0xd0 kernel/sched/core.c:6596
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 put_obj_stock mm/memcontrol.c:2179 [inline]
 refill_obj_stock+0x3a0/0x470 mm/memcontrol.c:3256
 obj_cgroup_charge+0x1c3/0x320 mm/memcontrol.c:3301
 memcg_slab_pre_alloc_hook mm/slab.h:287 [inline]
 slab_pre_alloc_hook+0x9d/0xc0 mm/slab.h:497
 slab_alloc_node mm/slub.c:3139 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x3d/0x280 mm/slub.c:3238
 __d_alloc+0x27/0x6d0 fs/dcache.c:1749
 d_alloc fs/dcache.c:1828 [inline]
 d_alloc_parallel+0x7b/0x1320 fs/dcache.c:2584
 __lookup_slow+0x134/0x410 fs/namei.c:1656
 lookup_one_len+0x19d/0x2d0 fs/namei.c:2769
 start_creating+0x184/0x310 fs/debugfs/inode.c:354
 __debugfs_create_file+0x6f/0x500 fs/debugfs/inode.c:399
 add_files net/mac80211/debugfs_netdev.c:803 [inline]
 ieee80211_debugfs_add_netdev+0x250/0xee0 net/mac80211/debugfs_netdev.c:843
 ieee80211_runtime_change_iftype net/mac80211/iface.c:1741 [inline]
 ieee80211_if_change_type+0x516/0x990 net/mac80211/iface.c:1763
 ieee80211_change_iface+0x57/0x420 net/mac80211/cfg.c:160
 rdev_change_virtual_intf net/wireless/rdev-ops.h:69 [inline]
 cfg80211_change_iface+0x739/0xe10 net/wireless/util.c:1074
 cfg80211_wext_siwmode net/wireless/wext-compat.c:66 [inline]
 __cfg80211_wext_siwmode+0x1c2/0x290 net/wireless/wext-compat.c:1569
 ioctl_standard_call+0xc6/0x250 net/wireless/wext-core.c:1026
 wireless_process_ioctl net/wireless/wext-core.c:964 [inline]
 wext_ioctl_dispatch+0x3da/0x470 net/wireless/wext-core.c:997
 wext_handle_ioctl+0x114/0x1d0 net/wireless/wext-core.c:1058
 sock_ioctl+0x143/0x700 net/socket.c:1199
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f257a65d159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f25788b5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f257a8e4fa0 RCX: 00007f257a65d159
RDX: 0000200000000080 RSI: 0000000000008b06 RDI: 000000000000000b
RBP: 00007f257a6f4024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f257a8e5038 R14: 00007f257a8e4fa0 R15: 00007ffe346fdfa8
 </TASK>