rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=a2cc/1/0x4000000000000000 softirq=69890/69893 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=79305, q=397 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 14903 Comm: syz.3.2436 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:debug_activate kernel/time/hrtimer.c:529 [inline]
RIP: 0010:enqueue_hrtimer+0xad/0x2c0 kernel/time/hrtimer.c:1109
Code: 12 00 45 85 e4 0f 84 6c 01 00 00 e8 8d dd 12 00 eb 05 e8 86 dd 12 00 4c 89 f7 48 c7 c6 20 5b cf 8b e8 77 39 07 03 41 0f b6 d7 <4c> 89 f7 89 ee e8 19 02 00 00 49 89 dc 49 c1 ec 03 43 80 3c 2c 00
RSP: 0018:ffffc90000a08da0 EFLAGS: 00000082
RAX: 0000000000000000 RBX: ffff8880b87283c0 RCX: 0000000000010000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: 0000000000000000 R08: ffffffff9a743f23 R09: 1ffffffff34e87e4
R10: dffffc0000000000 R11: fffffbfff34e87e5 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88802a90c300 R15: 0000000000000000
FS:  00007faa204c16c0(0000) GS:ffff888125343000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564cbb223008 CR3: 000000002a7cc000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1946 [inline]
 __hrtimer_run_queues+0x4d2/0xa20 kernel/time/hrtimer.c:1994
 hrtimer_interrupt+0x44b/0x950 kernel/time/hrtimer.c:2113
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1067
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 0d 1c ec f5 f7 c3 00 02 00 00 74 05 e8 10 38 17 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a4 ad dd f5 65 8b 05 9d d0 87 07 85 c0 74 18 5b 41 5e e9 41 48
RSP: 0018:ffffc90003c37900 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000292 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dfb6c81 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff903219b7 R09: 1ffffffff2064336
R10: dffffc0000000000 R11: fffffbfff2064337 R12: ffff88809cd3e000
R13: ffff88809cd3d000 R14: ffffffff9a6cce80 R15: 0000000000000001
 __debug_check_no_obj_freed lib/debugobjects.c:1125 [inline]
 debug_check_no_obj_freed+0x52e/0x550 lib/debugobjects.c:1146
 __free_pages_prepare mm/page_alloc.c:1440 [inline]
 __free_frozen_pages+0x549/0xdb0 mm/page_alloc.c:2978
 vfree+0x25a/0x400 mm/vmalloc.c:3479
 xskq_destroy+0x40/0x60 net/xdp/xsk_queue.c:64
 xsk_release+0x709/0x9c0 net/xdp/xsk.c:1326
 __sock_release net/socket.c:722 [inline]
 sock_close+0xc3/0x240 net/socket.c:1514
 __fput+0x44f/0xa60 fs/file_table.c:510
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 get_signal+0x11eb/0x1330 kernel/signal.c:2811
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faa1f59c819
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:00007faa204c1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffed RBX: 00007faa1f816090 RCX: 00007faa1f59c819
RDX: 0000000000000010 RSI: 0000200000000100 RDI: 0000000000000006
RBP: 00007faa1f632c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faa1f816128 R14: 00007faa1f816090 R15: 00007fffa446f3c8
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g79305 f0x0 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:27544 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x17b4/0x5680 kernel/sched/core.c:7183
 __schedule_loop kernel/sched/core.c:7262 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7277
 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+0x514/0xb70 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:
CPU: 0 UID: 0 PID: 15063 Comm: modprobe Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_many_cond+0xe32/0x1210 kernel/smp.c:892
Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 77 e7 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 22 e3 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 06 e3
RSP: 0000:ffffc900054df820 EFLAGS: 00000293
RAX: ffffffff81b97aea RBX: 1ffff110170e8165 RCX: ffff88805612bd80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900054df950 R08: ffffffff903219b7 R09: 1ffffffff2064336
R10: dffffc0000000000 R11: fffffbfff2064337 R12: ffff8880b8740b28
R13: dffffc0000000000 R14: ffff8880b863c148 R15: 0000000000000001
FS:  00007f00c13eec80(0000) GS:ffff888125243000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f00c148d480 CR3: 00000000258c0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1057
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x5c3/0x10b0 arch/x86/mm/tlb.c:1451
 flush_tlb_page arch/x86/include/asm/tlbflush.h:345 [inline]
 ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:103
 wp_page_copy mm/memory.c:3846 [inline]
 do_wp_page+0x4129/0x5a00 mm/memory.c:4241
 handle_pte_fault mm/memory.c:6333 [inline]
 __handle_mm_fault mm/memory.c:6455 [inline]
 handle_mm_fault+0x1520/0x3310 mm/memory.c:6624
 do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f00c14671b0
Code: 00 00 00 00 00 0f 1f 44 00 00 55 53 48 8d 1d 07 63 02 00 48 8d ab 00 01 00 00 48 83 ec 08 48 8b 3d d5 62 02 00 e8 f0 ee ff ff <48> c7 05 c5 62 02 00 00 00 00 00 0f 1f 44 00 00 48 8b 3b 48 83 c3
RSP: 002b:00007ffe03ec7250 EFLAGS: 00010246
RAX: 00007f00c148a4f8 RBX: 00007f00c148d4a0 RCX: 0000000000000000
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f00c148d5a0 R08: 00007ffe03ec72c0 R09: 0000000000000000
R10: 00007ffe03ec7180 R11: 00007ffe03ec7240 R12: 00007f00c148a4d0
R13: 00007f00c1798a08 R14: 0000000000000000 R15: 00007f00c175aab0
 </TASK>