rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (3 ticks this GP) idle=3414/1/0x4000000000000000 softirq=14886/14886 fqs=0
rcu: 	(detected by 0, t=10504 jiffies, g=8493, q=1059 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5867 Comm: syz-executor257 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:preempt_count_add+0x5a/0x1a0 kernel/sched/core.c:5829
Code: 18 00 75 07 65 8b 05 45 54 10 11 65 01 3d 3e 54 10 11 48 c7 c0 20 a3 ab 99 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 ec 00 00 00 <83> 3d 0f a7 1b 18 00 75 11 65 8b 05 16 54 10 11 0f b6 c0 3d f5 00
RSP: 0018:ffffc90000a08bc0 EFLAGS: 00000097
RAX: 0000000000000004 RBX: ffffffff99d66d60 RCX: ffffffff99aba303
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90000a08c78 R08: ffffc90000a08caf R09: 0000000000000000
R10: ffffc90000a08ca0 R11: fffff52000141196 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000802 R15: dffffc0000000000
FS:  000055557532a480(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc5ad8fff18 CR3: 0000000071882000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:109 [inline]
 _raw_spin_lock_irqsave+0x8c/0xf0 kernel/locking/spinlock.c:162
 debug_object_activate+0xbb/0x420 lib/debugobjects.c:818
 debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline]
 debug_activate kernel/time/hrtimer.c:484 [inline]
 enqueue_hrtimer+0x30/0x3a0 kernel/time/hrtimer.c:1088
 __run_hrtimer kernel/time/hrtimer.c:1778 [inline]
 __hrtimer_run_queues+0x656/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:owner_on_cpu include/linux/sched.h:2276 [inline]
RIP: 0010:mutex_spin_on_owner+0x13a/0x360 kernel/locking/mutex.c:361
Code: 89 44 24 30 48 89 74 24 18 48 c1 ee 03 48 89 74 24 38 eb 11 49 8b 04 24 48 83 e0 f8 49 39 c7 0f 85 e8 01 00 00 48 8b 44 24 58 <42> 0f b6 04 30 84 c0 0f 85 5a 01 00 00 48 8b 44 24 10 83 38 00 0f
RSP: 0018:ffffc90003feec68 EFLAGS: 00000246
RAX: 1ffff110285da786 RBX: ffff888024ac8750 RCX: ffffffff819cde28
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888024ac8700
RBP: 1ffff110049590e0 R08: ffff888024ac8707 R09: 1ffff110049590e0
R10: dffffc0000000000 R11: ffffed10049590e1 R12: ffff888024ac8700
R13: ffff888024ac8750 R14: dffffc0000000000 R15: ffff888142ed3c00
 mutex_optimistic_spin kernel/locking/mutex.c:464 [inline]
 __mutex_lock_common kernel/locking/mutex.c:602 [inline]
 __mutex_lock+0x311/0x1350 kernel/locking/mutex.c:760
 class_wiphy_constructor include/net/cfg80211.h:6212 [inline]
 reg_process_self_managed_hints+0xaf/0x1c0 net/wireless/reg.c:3209
 wiphy_register+0x1d44/0x28d0 net/wireless/core.c:1042
 ieee80211_register_hw+0x3425/0x4080 net/mac80211/main.c:1574
 mac80211_hwsim_new_radio+0x2f0e/0x5340 drivers/net/wireless/virtual/mac80211_hwsim.c:5568
 hwsim_new_radio_nl+0xea4/0x1b10 drivers/net/wireless/virtual/mac80211_hwsim.c:6252
 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:729
 __sys_sendto+0x3bd/0x520 net/socket.c:2228
 __do_sys_sendto net/socket.c:2235 [inline]
 __se_sys_sendto net/socket.c:2231 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2231
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc5ad87b82c
Code: ba 51 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 00 52 02 00 48 8b
RSP: 002b:00007ffc468a2be0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fc5ad903200 RCX: 00007fc5ad87b82c
RDX: 0000000000000024 RSI: 00007fc5ad903250 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc468a2c34 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fc5ad903250 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10503 jiffies! g8493 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=4346
rcu: rcu_preempt kthread starved for 10504 jiffies! g8493 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27496 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>