rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=2104/1/0x4000000000000000 softirq=39992/39993 fqs=2
rcu: 	(detected by 0, t=10502 jiffies, g=29205, q=77 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8980 Comm: syz.4.760 Not tainted 6.15.0-syzkaller-01972-g914873bc7df9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:match_held_lock+0x76/0xc0 kernel/locking/lockdep.c:-1
Code: ff 1f 00 00 48 c7 c2 70 43 1e 93 48 29 d0 48 c1 f8 03 48 ba 29 5c 8f c2 f5 28 5c 8f 48 0f af d0 bb 01 00 00 00 48 39 ca 74 02 <31> db 89 d8 5b 41 5e e9 7e cb 02 00 cc 90 e8 57 c3 5c f9 85 c0 74
RSP: 0018:ffffc90000a08ce0 EFLAGS: 00000083
RAX: 0000000000000004 RBX: 0000000000000001 RCX: 20dd59b82d97ac00
RDX: ffff88802ed18000 RSI: ffff8880b8927ad8 RDI: ffff88802ed18b40
RBP: 00000000ffffffff R08: ffff8880594fe357 R09: 0000000000000000
R10: ffff8880594fe340 R11: ffffed100b29fc6b R12: 0000000000000046
R13: ffff88802ed18000 R14: ffff8880b8927ad8 R15: 0000000000000002
FS:  00007f5895ddd6c0(0000) GS:ffff8881261c7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c37487d CR3: 000000002fe22000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __lock_is_held kernel/locking/lockdep.c:5604 [inline]
 lock_is_held_type+0xa8/0x190 kernel/locking/lockdep.c:5943
 lock_is_held include/linux/lockdep.h:249 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1727 [inline]
 __hrtimer_run_queues+0x284/0xc60 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:lock_is_held_type+0x137/0x190 kernel/locking/lockdep.c:5948
Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 69 c3 1e 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9001a8ff838 EFLAGS: 00000206
RAX: 20dd59b82d97ac00 RBX: 0000000000000000 RCX: 20dd59b82d97ac00
RDX: ffff88802ed18000 RSI: ffffffff8d931e7f RDI: ffffffff8bc178c0
RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff8b555580
R10: ffffc9001a8ff930 R11: fffff5200351ff29 R12: 0000000000000246
R13: ffff88802ed18000 R14: ffff888141298850 R15: 0000000000000003
 lock_is_held include/linux/lockdep.h:249 [inline]
 xa_entry include/linux/xarray.h:1220 [inline]
 xas_descend lib/xarray.c:208 [inline]
 xas_load+0x1b5/0x5b0 lib/xarray.c:246
 xa_load+0x118/0x210 lib/xarray.c:1619
 memcg_list_lru_allocated mm/list_lru.c:506 [inline]
 memcg_list_lru_alloc+0x12f/0x7e0 mm/list_lru.c:517
 __memcg_slab_post_alloc_hook+0x149/0x8c0 mm/memcontrol.c:3058
 memcg_slab_post_alloc_hook mm/slub.c:2179 [inline]
 slab_post_alloc_hook mm/slub.c:4157 [inline]
 slab_alloc_node mm/slub.c:4196 [inline]
 kmem_cache_alloc_lru_noprof+0x2c7/0x3d0 mm/slub.c:4215
 alloc_inode+0x6a/0x1b0 fs/inode.c:346
 new_inode+0x22/0x170 fs/inode.c:1145
 debugfs_get_inode fs/debugfs/inode.c:72 [inline]
 debugfs_create_dir+0xfb/0x420 fs/debugfs/inode.c:597
 kvm_create_vm_debugfs+0x1e3/0x900 virt/kvm/kvm_main.c:1041
 kvm_create_vm virt/kvm/kvm_main.c:1206 [inline]
 kvm_dev_ioctl_create_vm virt/kvm/kvm_main.c:5404 [inline]
 kvm_dev_ioctl+0x1516/0x18e0 virt/kvm/kvm_main.c:5446
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x220 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5894f8e969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5895ddd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f58951b6160 RCX: 00007f5894f8e969
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000009
RBP: 00007f5895010ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f58951b6160 R15: 00007fff87d14488
 </TASK>
rcu: rcu_preempt kthread starved for 10498 jiffies! g29205 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:27016 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5392 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6781
 __schedule_loop kernel/sched/core.c:6859 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6874
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:148
 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: 12 Comm: kworker/u8:0 Not tainted 6.15.0-syzkaller-01972-g914873bc7df9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xe69/0x11c0 kernel/smp.c:885
Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 b0 6f 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 5b 6b 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 40 6b 0b
RSP: 0000:ffffc90000117740 EFLAGS: 00000293
RAX: ffffffff81b46890 RBX: ffff8880b883b000 RCX: ffff88801ce95a00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900001178a0 R08: ffffffff8f7e98b7 R09: 1ffffffff1efd316
R10: dffffc0000000000 R11: fffffbfff1efd317 R12: 1ffff11017127ef1
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b893f788
FS:  0000000000000000(0000) GS:ffff8881260c7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000135000 CR3: 000000000dd36000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2660 [inline]
 smp_text_poke_batch_finish+0x5e0/0x1100 arch/x86/kernel/alternative.c:2870
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:850
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
vkms_vblank_simulate: vblank timer overrun