rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10460 ticks this GP) idle=cb7/1/0x4000000000000000 softirq=79682/79682 fqs=5160 
	(t=10501 jiffies g=121297 q=197)
NMI backtrace for cpu 0
CPU: 0 PID: 23519 Comm: syz.1.5137 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x22f/0x380 kernel/rcu/tree_stall.h:349
 print_cpu_stall+0x31d/0x5f0 kernel/rcu/tree_stall.h:633
 check_cpu_stall kernel/rcu/tree_stall.h:727 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x6d8/0x1110 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:1818
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4fe/0xc40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:hook_cred_free+0x6c/0xb0 security/landlock/cred.c:39
Code: b6 04 30 84 c0 75 41 48 63 05 ec b7 18 08 48 01 c3 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 97 d6 17 fe 48 8b 1b <48> 85 db 74 10 e8 6a 6e d3 fd 48 89 df 5b 41 5e e9 ef eb ff ff e8
RSP: 0018:ffffc90000007b58 EFLAGS: 00000246
RAX: 1ffff110055e9d10 RBX: 0000000000000000 RCX: ffff888026959dc0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff88802b187c80
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed1005630f92
R10: ffffed1005630f92 R11: 1ffff11005630f91 R12: dffffc0000000000
R13: 1ffff11005630fa2 R14: dffffc0000000000 R15: ffffffff8bbd15e0
 security_cred_free+0x81/0xf0 security/security.c:1717
 put_cred_rcu+0xdd/0x3e0 kernel/cred.c:115
 rcu_do_batch kernel/rcu/tree.c:2523 [inline]
 rcu_core+0x962/0x15d0 kernel/rcu/tree.c:2763
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:finish_lock_switch+0x134/0x280 kernel/sched/core.c:4804
Code: be ff ff ff ff e8 7c fc 55 08 85 c0 74 4a 4d 85 ff 75 66 0f 1f 44 00 00 48 89 df e8 76 67 5f 08 e8 11 76 2a 00 fb 48 83 c4 08 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 48 89 df e8 d9 0f fe ff 43 80 3c
RSP: 0018:ffffc9000351fb28 EFLAGS: 00000286
RAX: 80984ba0c4256e00 RBX: ffff8880b903a340 RCX: 80984ba0c4256e00
RDX: dffffc0000000000 RSI: ffffffff8a0b1c60 RDI: ffffffff8a59e580
RBP: 1ffff11017207613 R08: dffffc0000000000 R09: ffffed1017207662
R10: ffffed1017207662 R11: 1ffff11017207661 R12: 1ffff110172075c1
R13: dffffc0000000000 R14: ffff8880b903ae08 R15: 0000000000000000
 finish_task_switch+0x12f/0x640 kernel/sched/core.c:4921
 context_switch kernel/sched/core.c:5052 [inline]
 __schedule+0x11c3/0x4390 kernel/sched/core.c:6395
 preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:exit_to_user_mode_loop+0x40/0x130 kernel/entry/common.c:168
Code: fb eb 1d e8 b2 4b 43 08 65 48 8b 05 8a 3d 9c 7e 4c 8b 30 41 f7 c6 0e 30 02 00 0f 84 ed 00 00 00 e8 a5 b7 17 00 fb 41 f6 c6 08 <74> 05 e8 09 80 4b 08 41 f7 c6 00 10 00 00 74 08 48 89 df e8 18 d9
RSP: 0000:ffffc9000351ff10 EFLAGS: 00000202
RAX: 80984ba0c4256e00 RBX: ffffc9000351ff58 RCX: 80984ba0c4256e00
RDX: dffffc0000000000 RSI: ffffffff8a0b1c60 RDI: ffffffff8a59e580
RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed1017207662
R10: ffffed1017207662 R11: 1ffff11017207661 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000008 R15: ffff888026959dc0
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0033:0x7f7b0a1736c9
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:00007f7b083da0e8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f7b0a3c9fa8 RCX: 00007f7b0a1736c9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f7b0a3c9fac
RBP: 00007f7b0a3c9fa0 R08: 002385f51897535a R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7b0a3ca038 R14: 00007ffff77ad550 R15: 00007ffff77ad638
 </TASK>