rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-....: (0 ticks this GP) idle=be9/1/0x4000000000000002 softirq=146964/146964 fqs=2102 (detected by 1, t=10504 jiffies, g=224197, q=882) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 15021 Comm: syz.9.10763 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:check_preemption_disabled+0x4b/0x110 lib/smp_processor_id.c:55 Code: 0d 42 78 60 76 f7 c1 ff ff ff 7f 74 1f 65 48 8b 0c 25 28 00 00 00 48 3b 4c 24 08 0f 85 c4 00 00 00 48 83 c4 10 5b 41 5e 41 5f <5d> c3 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 74 RSP: 0018:ffffc9000300e8c0 EFLAGS: 00000082 RAX: 0000000000000000 RBX: ffff88801e7dd390 RCX: 9023bf6f9160d300 RDX: ffffc90006051000 RSI: ffffffff8a12ac80 RDI: ffffffff8a59e800 RBP: ffff88801e7dd800 R08: dffffc0000000000 R09: ffffed1003cfbb01 R10: ffffed1003cfbb01 R11: 1ffff11003cfbb00 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f761348e6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2fc4cf CR3: 000000007d9d0000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __perf_event_account_interrupt+0x2b/0x280 kernel/events/core.c:9422 __perf_event_overflow+0x99/0x530 kernel/events/core.c:9474 perf_swevent_overflow kernel/events/core.c:9591 [inline] perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629 perf_tp_event+0x32c/0xb50 kernel/events/core.c:10047 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10021 perf_trace_preemptirq_template+0x2be/0x380 include/trace/events/preemptirq.h:14 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713 RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:674 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 ed 11 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc9000300ee80 EFLAGS: 00000206 RAX: 9023bf6f9160d300 RBX: 1ffff92000601dd4 RCX: 9023bf6f9160d300 RDX: dffffc0000000000 RSI: ffffffff8a0b1be0 RDI: ffffffff8a59e800 RBP: ffffc9000300ef48 R08: dffffc0000000000 R09: fffffbfff1ff542c R10: fffffbfff1ff542c R11: 1ffffffff1ff542b R12: ffffffff8c120c00 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422 rcu_read_unlock include/linux/rcupdate.h:772 [inline] percpu_ref_put_many include/linux/percpu-refcount.h:324 [inline] percpu_ref_put+0xcc/0x150 include/linux/percpu-refcount.h:338 memcg_kmem_uncharge_page include/linux/memcontrol.h:1703 [inline] free_thread_stack+0xda/0x430 kernel/fork.c:283 release_task_stack kernel/fork.c:433 [inline] put_task_stack+0x97/0x140 kernel/fork.c:444 finish_task_switch+0x26f/0x640 kernel/sched/core.c:4961 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:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:172 [inline] RIP: 0010:write_comp_data kernel/kcov.c:227 [inline] RIP: 0010:__sanitizer_cov_trace_switch+0x5e/0xe0 kernel/kcov.c:329 Code: 41 54 53 48 8b 0c cd 88 dd 0e 8a 48 8b 54 24 20 65 4c 8b 05 04 9f 8a 7e 45 31 c9 eb 08 49 ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 <65> 44 8b 1d f2 9e 8a 7e 41 81 e3 00 01 ff 00 74 13 41 81 fb 00 01 RSP: 0018:ffffc9000300f3c8 EFLAGS: 00000202 RAX: 000000000000000a RBX: dffffc0000000000 RCX: 0000000000000001 RDX: ffffffff83fde1b3 RSI: ffffffff8c73b960 RDI: 000000000000006f RBP: ffff0000ffffff00 R08: ffff888018ba0000 R09: 0000000000000003 R10: 0000000000000064 R11: 0000000000000002 R12: ffff0000ffffff00 R13: 1ffffffff14a7458 R14: ffffffff8a53a2c3 R15: 000000000000006f format_decode+0x783/0x1330 lib/vsprintf.c:2621 vsnprintf+0xef/0x1a00 lib/vsprintf.c:2763 snprintf+0xd7/0x120 lib/vsprintf.c:2944 tomoyo_audit_path_number_log security/tomoyo/file.c:233 [inline] tomoyo_path_number_perm+0x388/0x5d0 security/tomoyo/file.c:734 tomoyo_path_mknod+0x13f/0x180 security/tomoyo/tomoyo.c:239 security_path_mknod+0xec/0x140 security/security.c:1147 may_o_create fs/namei.c:3292 [inline] lookup_open fs/namei.c:3433 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0xb6c/0x2f30 fs/namei.c:3747 do_filp_open+0x1b3/0x3e0 fs/namei.c:3777 do_sys_openat2+0x142/0x4a0 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f7615227749 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:00007f761348e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f761547dfa0 RCX: 00007f7615227749 RDX: 00000000000026e1 RSI: 00002000000005c0 RDI: ffffffffffffff9c RBP: 00007f76152abf91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f761547e038 R14: 00007f761547dfa0 R15: 00007fff95e53ff8