rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (2 ticks this GP) idle=094c/1/0x4000000000000000 softirq=33136/33136 fqs=0 rcu: (detected by 0, t=10502 jiffies, g=26221, q=747 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 9588 Comm: dhcpcd-run-hook Not tainted 6.14.0-rc3-syzkaller-00154-g28b04731a38c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline] RIP: 0010:lock_release+0xba/0xa30 kernel/locking/lockdep.c:5862 Code: 83 fe 05 00 00 89 c3 48 89 d8 48 c1 e8 06 48 8d 3c c5 70 ea 3c 90 be 08 00 00 00 e8 a0 24 8c 00 48 0f a3 1d f8 14 a0 0e 73 16 91 43 0a 00 84 c0 75 0d 80 3d ae 24 8a 0e 00 0f 84 fc 05 00 00 RSP: 0018:ffffc90000a18a40 EFLAGS: 00000057 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff819cd570 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff903cea70 RBP: ffffc90000a18b70 R08: ffffffff903cea77 R09: 1ffffffff2079d4e R10: dffffc0000000000 R11: fffffbfff2079d4f R12: 1ffff92000143154 R13: ffffffff84fc3105 R14: ffffc90000a18ba0 R15: dffffc0000000000 FS: 00007f4d918ec380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005601e5ec2000 CR3: 000000002d9d8000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x79/0x140 kernel/locking/spinlock.c:194 debug_object_deactivate+0x2d5/0x390 lib/debugobjects.c:888 debug_hrtimer_deactivate kernel/time/hrtimer.c:460 [inline] debug_deactivate+0x1b/0x220 kernel/time/hrtimer.c:502 __run_hrtimer kernel/time/hrtimer.c:1769 [inline] __hrtimer_run_queues+0x305/0xd30 kernel/time/hrtimer.c:1865 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927 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 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:string_nocheck lib/vsprintf.c:632 [inline] RIP: 0010:string+0x1ce/0x2b0 lib/vsprintf.c:714 Code: 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 61 49 8d 6c 1d 00 45 0f b6 3c 1c 31 ff 44 89 fe e8 72 69 bd f5 <45> 85 ff 0f 84 94 00 00 00 48 3b 6c 24 08 73 29 e8 5d 66 bd f5 48 RSP: 0018:ffffc900033878f0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000006 RCX: dffffc0000000000 RDX: ffff888021f9bc00 RSI: 000000000000006c RDI: 0000000000000000 RBP: ffff888033eaa006 R08: ffffffff8c04541e R09: ffffffff8c0425ae R10: 0000000000000008 R11: ffff888021f9bc00 R12: ffff88801de8a528 R13: ffff888033eaa000 R14: 00000000fffffffe R15: 000000000000006c vsnprintf+0x8b4/0x1220 lib/vsprintf.c:2843 snprintf+0xda/0x120 lib/vsprintf.c:2937 tomoyo_find_next_domain+0xe5a/0x1dd0 tomoyo_bprm_check_security+0x117/0x180 security/tomoyo/tomoyo.c:102 security_bprm_check+0x86/0x250 security/security.c:1302 search_binary_handler fs/exec.c:1765 [inline] exec_binprm fs/exec.c:1807 [inline] bprm_execve+0x8d3/0x1430 fs/exec.c:1859 do_execveat_common+0x57f/0x710 fs/exec.c:1966 do_execve fs/exec.c:2040 [inline] __do_sys_execve fs/exec.c:2116 [inline] __se_sys_execve fs/exec.c:2111 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2111 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4d91a26ef7 Code: ba 0f 00 5b 5d 41 5c 41 5d 41 5e 41 5f e9 63 d8 fb ff 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 66 90 b8 3b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 01 3f 0f 00 f7 d8 64 89 01 48 RSP: 002b:00007fff382bb868 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00005601e5ec1f58 RCX: 00007f4d91a26ef7 RDX: 00005601e5ec1f78 RSI: 00005601e5ec1f58 RDI: 00005601e5ec2000 RBP: 00005601e5ec2000 R08: 00005601e5ec2005 R09: 00007fff382bee9a R10: 0000000000000008 R11: 0000000000000246 R12: 00005601e5ec1f78 R13: 00007f4d91bd4904 R14: 00005601e5ec1f78 R15: 0000000000000000 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g26221 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=8749 rcu: rcu_preempt kthread starved for 10502 jiffies! g26221 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 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:I stack:26104 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5378 [inline] __schedule+0x190e/0x4c90 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6857 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244