rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=671c/1/0x4000000000000000 softirq=38286/38287 fqs=58 rcu: (detected by 0, t=10505 jiffies, g=39989, q=718 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 11073 Comm: syz.3.1366 Not tainted 6.13.0-rc4-syzkaller-00004-gf07044dd0df0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__remove_hrtimer kernel/time/hrtimer.c:1109 [inline] RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1719 [inline] RIP: 0010:__hrtimer_run_queues+0x3c8/0xd30 kernel/time/hrtimer.c:1803 Code: 00 00 c6 02 00 80 e3 01 0f b6 db 31 ff 89 de e8 ee 9e 12 00 84 db 75 0a e8 e5 9b 12 00 e9 85 00 00 00 48 8b bc 24 98 00 00 00 <4c> 89 f6 e8 a0 a2 2f 0a 84 c0 74 07 e8 c7 9b 12 00 eb 6a 48 8b 9c RSP: 0018:ffffc90000a18d40 EFLAGS: 00000002 RAX: 0000000000010000 RBX: 0000000000000001 RCX: ffff888055150000 RDX: ffff888055150000 RSI: 0000000000000001 RDI: ffff8880b872c9d0 RBP: ffffc90000a18ea0 R08: ffffffff818cd7f2 R09: 1ffffffff2030a4e R10: dffffc0000000000 R11: fffffbfff2030a4f R12: 1ffff110170e593b R13: dffffc0000000000 R14: ffff88802177a340 R15: ffff8880b872c880 FS: 000055555e7b1500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020003c80 CR3: 00000000726ee000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1865 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:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5243 Code: c9 50 e8 59 0c 0c 00 48 83 c4 08 4c 89 f7 e8 ed 39 00 00 e9 de 04 00 00 4c 89 f7 e8 10 e8 54 0a e8 0b 8c 38 00 fb 48 8b 5d c0 <48> 8d bb f8 15 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc RSP: 0018:ffffc900030476c8 EFLAGS: 00000282 RAX: 9139bc6c25b96100 RBX: ffff888055150000 RCX: ffffffff9a377903 RDX: dffffc0000000000 RSI: ffffffff8c0a98e0 RDI: ffffffff8c5edce0 RBP: ffffc90003047710 R08: ffffffff90185277 R09: 1ffffffff2030a4e R10: dffffc0000000000 R11: fffffbfff2030a4f R12: 1ffff110170e7eac R13: dffffc0000000000 R14: ffff8880b863e740 R15: ffff8880b873f560 context_switch kernel/sched/core.c:5372 [inline] __schedule+0x1803/0x4be0 kernel/sched/core.c:6756 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6935 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6959 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 class_preempt_destructor include/linux/preempt.h:480 [inline] try_to_wake_up+0x9c3/0x1470 kernel/sched/core.c:4328 wake_up_process kernel/sched/core.c:4454 [inline] wake_up_q+0xc8/0x120 kernel/sched/core.c:1066 futex_wake+0x523/0x5c0 kernel/futex/waitwake.c:199 do_futex+0x392/0x560 kernel/futex/syscalls.c:107 __do_sys_futex kernel/futex/syscalls.c:179 [inline] __se_sys_futex+0x3f9/0x480 kernel/futex/syscalls.c:160 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: 0033:0x7fe43fd85d29 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:00007ffffe76c028 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fe43ff75fa8 RCX: 00007fe43fd85d29 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fe43ff75fa8 RBP: 00007fe43ff75fac R08: 0000000000000001 R09: 00007ffffe76c31f R10: 00007fe43ff75fa0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe43ff75fa0 R14: 0000000000000002 R15: 00000000000000b0 rcu: rcu_preempt kthread starved for 10215 jiffies! g39989 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:26136 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x17fb/0x4be0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2045 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2247 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.13.0-rc4-syzkaller-00004-gf07044dd0df0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline] RIP: 0010:acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112 Code: 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 80 d4 03 00 48 f7 00 08 00 00 00 75 10 66 90 0f 00 2d 15 af a7 00 f3 0f 1e fa fb f4 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 RSP: 0018:ffffffff8e607ca8 EFLAGS: 00000246 RAX: ffffffff8e6965c0 RBX: ffff8881436cf864 RCX: 00000000005312c1 RDX: 0000000000000001 RSI: ffff8881436cf800 RDI: ffff8881436cf864 RBP: 000000000003a878 R08: ffff8880b8637cdb R09: 1ffff110170c6f9b R10: dffffc0000000000 R11: ffffffff8bc0fc80 R12: ffff8880203c0800 R13: 0000000000000001 R14: 0000000000000001 R15: ffffffff8f10f360 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555e7cc5c8 CR3: 000000007e55e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:699 cpuidle_enter_state+0x109/0x470 drivers/cpuidle/cpuidle.c:268 cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:389 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:230 [inline] do_idle+0x372/0x5c0 kernel/sched/idle.c:325 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:423 rest_init+0x2dc/0x300 init/main.c:747 start_kernel+0x47f/0x500 init/main.c:1102 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147