rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=ccec/0/0x1 softirq=7738/7739 fqs=20 rcu: (detected by 1, t=10506 jiffies, g=4341, q=359 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.3.0-rc7-syzkaller-g6a8f57ae2eb0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 RIP: 0010:arch_atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline] RIP: 0010:atomic64_read include/linux/atomic/atomic-instrumented.h:647 [inline] RIP: 0010:taprio_set_budgets+0x130/0x300 net/sched/sch_taprio.c:676 Code: 83 c0 20 48 89 44 24 20 48 c1 e8 03 48 89 44 24 28 e9 c1 00 00 00 e8 7f 17 4f f9 48 8b 7c 24 20 be 08 00 00 00 e8 d0 2f a0 f9 <48> 8b 44 24 28 42 80 3c 30 00 0f 85 6a 01 00 00 4c 63 6c 24 08 48 RSP: 0018:ffffc90000007d20 EFLAGS: 00000046 RAX: 0000000000000001 RBX: ffff888149f29c84 RCX: ffffffff8833d3f0 RDX: ffffed100f37765d RSI: 0000000000000008 RDI: ffff888079bbb2e0 RBP: 0000000000000001 R08: 0000000000000000 R09: ffff888079bbb2e7 R10: ffffed100f37765c R11: 0000000000000000 R12: ffff888149f29c08 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000080000001 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe39a6ebb8 CR3: 0000000075c0e000 CR4: 0000000000350ef0 Call Trace: advance_sched+0x63f/0xd20 net/sched/sch_taprio.c:980 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x5fa/0xbe0 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x320/0x7b0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline] __sysvec_apic_timer_interrupt+0x14a/0x430 arch/x86/kernel/apic/apic.c:1113 sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1107 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 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:72 [inline] RIP: 0010:acpi_safe_halt+0x40/0x50 drivers/acpi/processor_idle.c:113 Code: eb 03 83 e3 01 89 de 0f 1f 44 00 00 84 db 75 1b 0f 1f 44 00 00 eb 0c 0f 1f 44 00 00 0f 00 2d 07 b1 b1 00 0f 1f 44 00 00 fb f4 5b c3 cc 0f 1f 00 66 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 0f RSP: 0018:ffffffff8c407d40 EFLAGS: 00000246 RAX: ffffffff8c495800 RBX: 0000000000000000 RCX: ffffffff89ffeb05 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88814005a064 R08: 0000000000000001 R09: ffff8880b9836cab R10: ffffed1017306d95 R11: 0000000000000000 R12: 0000000000000001 R13: ffff88814005a000 R14: ffff88814005a064 R15: 0000000000000000 acpi_idle_do_entry+0x53/0x70 drivers/acpi/processor_idle.c:573 acpi_idle_enter+0x173/0x290 drivers/acpi/processor_idle.c:711 cpuidle_enter_state+0xd3/0x6f0 drivers/cpuidle/cpuidle.c:267 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388 cpuidle_idle_call kernel/sched/idle.c:215 [inline] do_idle+0x305/0x3e0 kernel/sched/idle.c:282 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379 rest_init+0x16d/0x2b0 init/main.c:736 arch_call_rest_init+0x13/0x30 init/main.c:898 start_kernel+0x35a/0x4d0 init/main.c:1152 secondary_startup_64_no_verify+0xce/0xdb rcu: rcu_preempt kthread starved for 10405 jiffies! g4341 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:28624 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5307 [inline] __schedule+0xc91/0x5770 kernel/sched/core.c:6625 schedule+0xde/0x1a0 kernel/sched/core.c:6701 schedule_timeout+0x14e/0x2b0 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1608 rcu_gp_kthread+0x23a/0x360 kernel/rcu/tree.c:1807 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 5150 Comm: syz-executor.0 Not tainted 6.3.0-rc7-syzkaller-g6a8f57ae2eb0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 RIP: 0010:csd_lock_wait kernel/smp.c:413 [inline] RIP: 0010:smp_call_function_many_cond+0x654/0x13c0 kernel/smp.c:987 Code: 0b 00 85 ed 74 48 48 8b 44 24 08 49 89 c4 83 e0 07 49 c1 ec 03 48 89 c5 4d 01 f4 83 c5 03 e8 73 3a 0b 00 f3 90 41 0f b6 04 24 <40> 38 c5 7c 08 84 c0 0f 85 af 0a 00 00 8b 43 08 31 ff 83 e0 01 41 RSP: 0018:ffffc9000447f808 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9844e60 RCX: 0000000000000000 RDX: ffff88802a28d7c0 RSI: ffffffff8177b0ed RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000094001 R12: ffffed10173089cd R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000001 FS: 000000000118c400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000a93b72 CR3: 0000000075c0e000 CR4: 0000000000350ee0 Call Trace: on_each_cpu_cond_mask+0x5a/0xa0 kernel/smp.c:1155 __flush_tlb_multi arch/x86/include/asm/paravirt.h:87 [inline] flush_tlb_multi arch/x86/mm/tlb.c:924 [inline] flush_tlb_mm_range+0x36e/0x540 arch/x86/mm/tlb.c:1010 dup_mmap+0xad1/0x1480 kernel/fork.c:708 dup_mm kernel/fork.c:1548 [inline] copy_mm kernel/fork.c:1597 [inline] copy_process+0x7082/0x7590 kernel/fork.c:2267 kernel_clone+0xeb/0x890 kernel/fork.c:2682 __do_sys_clone+0xba/0x100 kernel/fork.c:2823 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x462c3b Code: ed 0f 85 60 01 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 89 00 00 00 41 89 c5 85 c0 0f 85 90 00 00 RSP: 002b:00007fff1f8e8890 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000462c3b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000118c400 R10: 000000000118c6d0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001