rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=126745, q=1448 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 949 (4295103359-4295102410), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 950 jiffies! g126745 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:26984 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 33 Comm: kworker/R-write Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: writeback wb_workfn (flush-7:9)
RIP: 0010:pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:430 [inline]
RIP: 0010:__pv_queued_spin_lock_slowpath+0x661/0xbc0 kernel/locking/qspinlock.c:325
Code: b6 04 01 84 c0 75 6f 48 8b 44 24 10 80 38 00 74 1d 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 28 c6 44 01 06 f8 f3 90 41 ff c4 <75> bf eb 68 4c 8b 7c 24 10 4c 89 ff be 02 00 00 00 e8 99 d8 7e f6
RSP: 0018:ffffc90000007880 EFLAGS: 00000286
RAX: dffffc0000000000 RBX: ffffc90000007920 RCX: 1ffff92000000f1c
RDX: 0000000000000100 RSI: ffffffff8def7104 RDI: ffff8880b863bcc0
RBP: ffffc90000007990 R08: ffffffff90119cb7 R09: 1ffffffff2023396
R10: dffffc0000000000 R11: fffffbfff2023397 R12: 00000000ffffb614
R13: 0000000000000000 R14: 1ffffffff1e80b8c R15: ffff8880b863bcd4
FS:  0000000000000000(0000) GS:ffff888125460000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559d29c887c0 CR3: 0000000077e86000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:35 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/paravirt-spinlock.h:66 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x26c/0x2f0 kernel/locking/spinlock_debug.c:116
 spin_lock include/linux/spinlock.h:341 [inline]
 mac80211_hwsim_tx_frame_no_nl+0x73a/0x11f0 drivers/net/wireless/virtual/mac80211_hwsim.c:1842
 mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2264
 mac80211_hwsim_beacon_tx+0x3e8/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2365
 __iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:760
 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:796
 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395
 __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
 __hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
 hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866
 handle_softirqs+0x22a/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 0a ca f0 f5 48 89 df e8 42 3f f1 f5 e8 4d 97 1c f6 fb bf 01 00 00 00 <e8> 42 fc e2 f5 65 8b 05 9b 0f 6b 07 85 c0 74 07 5b e9 6c 50 5f f5
RSP: 0018:ffffc90000a97830 EFLAGS: 00000206
RAX: 00000000004cb021 RBX: ffff888025698370 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8def7104 RDI: 0000000000000001
RBP: ffffc90000a97a90 R08: ffffffff90119cb7 R09: 1ffffffff2023396
R10: dffffc0000000000 R11: fffffbfff2023397 R12: ffff888025698068
R13: dffffc0000000000 R14: 0000000000000005 R15: 0000000000000000
 wb_workfn+0xdce/0xf50 fs/fs-writeback.c:-1
 process_one_work kernel/workqueue.c:3276 [inline]
 process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
 rescuer_thread+0x827/0x1130 kernel/workqueue.c:3583
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>