rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=7b6c/1/0x4000000000000000 softirq=51265/51269 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5839/1:b..l
rcu: 	(detected by 0, t=10505 jiffies, g=41617, q=208 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 10871 Comm: syz.1.2117 Not tainted 6.14.0-syzkaller-12966-ga2cc6ff5ec8f #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:lock_acquire+0x152/0x2f0 kernel/locking/lockdep.c:5869
Code: ff ff ff 65 0f c1 05 4d 9d c6 11 83 f8 01 0f 85 f9 00 00 00 48 c7 44 24 10 00 00 00 00 9c 8f 44 24 10 f7 44 24 10 00 02 00 00 <0f> 85 fd 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 65 48 8b 45 00 48
RSP: 0018:ffffc90000a08be0 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffff88806022e300 RCX: 996290c524b66300
RDX: 0000000000000001 RSI: ffffffff8e4e9221 RDI: ffffffff8ca0dd80
RBP: ffffffff93654020 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000046 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881250cc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3c6b37 CR3: 000000002a08c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 advance_sched+0xab/0xca0 net/sched/sch_taprio.c:924
 __run_hrtimer kernel/time/hrtimer.c:1791 [inline]
 __hrtimer_run_queues+0x5a6/0xd40 kernel/time/hrtimer.c:1855
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1917
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d 94 ed b4 0c 48 89 de 5b e9 53 21 5c 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 40 65 93 65 8b 15 58 f9
RSP: 0018:ffffc9001a9870b8 EFLAGS: 00000246
RAX: 1ffff110170e6574 RBX: ffff8880b8732ba0 RCX: ffffffff9a705603
RDX: ffff88807ea50000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9001a9871c0 R08: ffffffff8201845b R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff93654020
R13: ffffea0001e3b500 R14: ffff8880b8732b78 R15: dffffc0000000000
 local_lock_acquire include/linux/local_lock_internal.h:35 [inline]
 __folio_batch_add_and_move+0x384/0xdb0 mm/swap.c:192
 folio_mark_accessed+0x418/0xa40 mm/swap.c:474
 zap_present_folio_ptes mm/memory.c:1510 [inline]
 zap_present_ptes mm/memory.c:1586 [inline]
 do_zap_pte_range mm/memory.c:1687 [inline]
 zap_pte_range mm/memory.c:1731 [inline]
 zap_pmd_range mm/memory.c:1823 [inline]
 zap_pud_range mm/memory.c:1852 [inline]
 zap_p4d_range mm/memory.c:1873 [inline]
 unmap_page_range+0x2397/0x44d0 mm/memory.c:1894
 unmap_vmas+0x3ce/0x5f0 mm/memory.c:1984
 exit_mmap+0x2bc/0xde0 mm/mmap.c:1284
 __mmput+0x115/0x410 kernel/fork.c:1379
 exit_mm+0x221/0x310 kernel/exit.c:589
 do_exit+0x994/0x27f0 kernel/exit.c:940
 do_group_exit+0x207/0x2c0 kernel/exit.c:1102
 get_signal+0x1696/0x1730 kernel/signal.c:3034
 arch_do_signal_or_restart+0x98/0x840 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f548cf8d169
Code: Unable to access opcode bytes at 0x7f548cf8d13f.
RSP: 002b:00007f548de480e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f548d1a6088 RCX: 00007f548cf8d169
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f548d1a6088
RBP: 00007f548d1a6080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f548d1a608c
R13: 0000000000000000 R14: 00007ffc6c468d80 R15: 00007ffc6c468e68
 </TASK>
task:syz-executor    state:R  running task     stack:20696 pid:5839  tgid:5839  ppid:5825   task_flags:0x400140 flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7090
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_release+0x0/0x3e0 kernel/locking/lockdep.c:5874
Code: e6 b5 99 03 48 8b 7c 24 18 e9 92 f9 ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 30 48 89 f5 49
RSP: 0018:ffffc90003fcf540 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc90003fcf620 RCX: ffff88802a7b3c00
RDX: dffffc0000000000 RSI: ffffffff816debc8 RDI: ffffffff8ed3dfe0
RBP: dffffc0000000001 R08: ffffc90003fcfd58 R09: 0000000000000000
R10: ffffc90003fcf670 R11: fffff520007f9ed0 R12: ffffc90003fcf630
R13: dffffc0000000000 R14: ffffc90003fcfd68 R15: ffffffff816debc8
 rcu_lock_release include/linux/rcupdate.h:341 [inline]
 rcu_read_unlock include/linux/rcupdate.h:871 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
 unwind_next_frame+0x1a9f/0x23b0 arch/x86/kernel/unwind_orc.c:680
 arch_stack_walk+0x11e/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2389 [inline]
 slab_free mm/slub.c:4646 [inline]
 kfree+0x198/0x430 mm/slub.c:4845
 tomoyo_path_perm+0x512/0x640 security/tomoyo/file.c:842
 tomoyo_path_unlink+0xd1/0x110 security/tomoyo/tomoyo.c:162
 security_path_unlink+0x169/0x360 security/security.c:1965
 do_unlinkat+0x397/0x7b0 fs/namei.c:4605
 __do_sys_unlink fs/namei.c:4654 [inline]
 __se_sys_unlink fs/namei.c:4652 [inline]
 __x64_sys_unlink+0x47/0x50 fs/namei.c:4652
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efdee78c717
RSP: 002b:00007ffcf6e41d48 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efdee78c717
RDX: 00007ffcf6e41d70 RSI: 00007ffcf6e41e00 RDI: 00007ffcf6e41e00
RBP: 00007ffcf6e41e00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffcf6e42e90
R13: 00007efdee80e08c R14: 0000000000044c60 R15: 00007ffcf6e42ed0
 </TASK>
rcu: rcu_preempt kthread starved for 10505 jiffies! g41617 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:26688 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_timeout+0x15b/0x2b0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 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: 79 Comm: kworker/u8:5 Not tainted 6.14.0-syzkaller-12966-ga2cc6ff5ec8f #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x1bac/0x2d40 kernel/smp.c:885
Code: 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 b8 e2 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 68 de 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00
RSP: 0018:ffffc9000222f640 EFLAGS: 00000293
RAX: ffffffff81b7687d RBX: 1ffff110170e7e61 RCX: ffff88801d72bc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000222f840 R08: ffffffff81b76848 R09: 1ffffffff20bd4ae
R10: dffffc0000000000 R11: fffffbfff20bd4af R12: ffff8880b863ab88
R13: ffff8880b873f308 R14: ffff8880b863ab80 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888124fcc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556940d5c8 CR3: 000000000eb38000 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]
 text_poke_sync arch/x86/kernel/alternative.c:2455 [inline]
 text_poke_bp_batch+0x354/0xb30 arch/x86/kernel/alternative.c:2665
 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xc0/0x250 mm/kfence/core.c:850
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd50 kernel/workqueue.c:3400
 kthread+0x7b7/0x940 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
vkms_vblank_simulate: vblank timer overrun