syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10511 jiffies, g=9309, q=1680 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10511 (4294965214-4294954703), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10511 jiffies! g9309 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:28440 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x1139/0x6150 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6960
 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1ea/0xaf0 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x26d/0x380 kernel/rcu/tree.c:2285
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 4579 Comm: kworker/u8:17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:__lock_release kernel/locking/lockdep.c:5571 [inline]
RIP: 0010:lock_release+0x120/0x2d0 kernel/locking/lockdep.c:5889
Code: 00 00 66 83 78 22 1f 76 0c 66 83 68 22 20 66 83 78 22 1f 77 3c 8b 54 24 0c 41 89 96 28 0b 00 00 48 8b 00 49 89 86 20 0b 00 00 <41> 8d 47 ff 39 d0 74 1f 83 c2 01 48 8d 4c 24 08 44 89 fe 4c 89 f7
RSP: 0018:ffffc90000a08cf0 EFLAGS: 00000097
RAX: 37609dba68070e38 RBX: ffffffff9aea8bc0 RCX: ffffc90000a08cfc
RDX: 0000000000000004 RSI: ffffffff9aea8bc0 RDI: ffff888035a3d550
RBP: 0000000000000006 R08: 0000000000000001 R09: fffff52000141198
R10: 0000000000000003 R11: ffff888035a3d4b0 R12: ffffffff84b4a4dc
R13: 0000000000000006 R14: ffff888035a3c980 R15: 0000000000000005
FS:  0000000000000000(0000) GS:ffff8881249fb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30424000 CR3: 000000007600e000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
 _raw_spin_unlock_irqrestore+0x1a/0x80 kernel/locking/spinlock.c:194
 debug_object_deactivate+0x1ec/0x3a0 lib/debugobjects.c:888
 debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline]
 debug_deactivate kernel/time/hrtimer.c:483 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1745 [inline]
 __hrtimer_run_queues+0x46f/0xc40 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x3c0 arch/x86/kernel/apic/apic.c:1062
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x47/0x20a0 arch/x86/kernel/unwind_orc.c:680
Code: fd 41 54 55 53 48 83 ec 38 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 02 0b 00 00 41 8b 5d 00 31 ed 85 db 75 15 48 83 c4 38 89 e8 5b <5d> 41 5c 41 5d 41 5e 41 5f e9 9b ed 0d 0a 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc9000e9a7620 EFLAGS: 00000286
RAX: 0000000000000001 RBX: ffffc9000e9a7650 RCX: ffffc9000e9a75a4
RDX: 0000000000000000 RSI: ffffffff8daa5c73 RDI: ffff888035a3ce04
RBP: 0000000000000001 R08: 0000000000000001 R09: 000000002d6b9d85
R10: 0000000000000002 R11: 000000000009c351 R12: ffffc9000e9a76a0
R13: ffffc9000e9a7650 R14: ffffc9000e9a7be0 R15: ffffc9000e9a7684
 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6668 [inline]
 kmem_cache_free+0x2d8/0x770 mm/slub.c:6779
 skb_kfree_head net/core/skbuff.c:1066 [inline]
 skb_kfree_head net/core/skbuff.c:1063 [inline]
 skb_free_head+0x1b7/0x210 net/core/skbuff.c:1080
 skb_release_data+0x795/0x9e0 net/core/skbuff.c:1107
 skb_release_all net/core/skbuff.c:1182 [inline]
 __kfree_skb net/core/skbuff.c:1196 [inline]
 sk_skb_reason_drop+0x129/0x1a0 net/core/skbuff.c:1234
 kfree_skb_reason include/linux/skbuff.h:1322 [inline]
 kfree_skb include/linux/skbuff.h:1331 [inline]
 ieee80211_iface_work+0x42f/0x1350 net/mac80211/iface.c:1792
 cfg80211_wiphy_work+0x3fb/0x560 net/wireless/core.c:438
 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257
 process_scheduled_works kernel/workqueue.c:3340 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>