rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (4 GPs behind) idle=34fc/0/0x1 softirq=6021/6021 fqs=0 rcu: (detected by 0, t=10502 jiffies, g=4937, q=235 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:trace_hrtimer_start include/trace/events/timer.h:222 [inline] RIP: 0010:debug_activate kernel/time/hrtimer.c:478 [inline] RIP: 0010:enqueue_hrtimer+0x280/0x310 kernel/time/hrtimer.c:1087 Code: 0f 94 c4 31 ff 44 89 e6 e8 cd 59 11 00 45 84 e4 0f 84 bc fd ff ff e8 8f 5e 11 00 e8 ba ce 89 ff e9 ad fd ff ff e8 80 5e 11 00 ab 9c f9 ff 31 ff 41 89 c4 89 c6 e8 9f 59 11 00 45 84 e4 0f 85 RSP: 0018:ffffc900001f0e18 EFLAGS: 00000046 RAX: 0000000000010002 RBX: ffff8880b992c040 RCX: ffffffff8176b023 RDX: ffff8880156fbb80 RSI: ffffffff8176b220 RDI: 0000000000000001 RBP: ffff888079e5b340 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff8acf2f60 R12: 0000000000000001 R13: 0000000000000000 R14: ffff888079e5b340 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6c0d48e2d0 CR3: 000000002369b000 CR4: 0000000000350ef0 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1705 [inline] __hrtimer_run_queues+0xa12/0xc20 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline] __sysvec_apic_timer_interrupt+0x105/0x400 arch/x86/kernel/apic/apic.c:1082 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 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+0x1b/0x20 drivers/acpi/processor_idle.c:113 Code: ed c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 65 48 8b 04 25 80 c2 03 00 48 8b 00 a8 08 75 0c eb 07 0f 00 2d 47 98 af 00 fb f4 c3 0f 1f 00 0f b6 47 08 3c 01 74 0b 3c 02 74 05 8b 7f 04 eb 9f RSP: 0018:ffffc90000187d58 EFLAGS: 00000246 RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8a8b1cc7 RDX: 0000000000000001 RSI: ffff8880196fd800 RDI: ffff8880196fd864 RBP: ffff8880196fd864 R08: 0000000000000000 R09: ffffed1017326e7d R10: ffff8880b99373eb R11: 0000000000000000 R12: ffff88801b300000 R13: ffffffff8dd27ea0 R14: 0000000000000001 R15: 0000000000000000 acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:707 cpuidle_enter_state+0x83/0x500 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+0x319/0x400 kernel/sched/idle.c:312 cpu_startup_entry+0x50/0x60 kernel/sched/idle.c:410 start_secondary+0x20e/0x2a0 arch/x86/kernel/smpboot.c:336 secondary_startup_64_no_verify+0x170/0x17b rcu: rcu_preempt kthread starved for 10502 jiffies! g4937 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:28544 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0xf12/0x5c00 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0xe9/0x270 kernel/sched/core.c:6817 schedule_timeout+0x137/0x290 kernel/time/timer.c:2183 rcu_gp_fqs_loop+0x1ec/0xb10 kernel/rcu/tree.c:1631 rcu_gp_kthread+0x24b/0x380 kernel/rcu/tree.c:1830 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 PID: 5054 Comm: syz-executor127 Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline] RIP: 0010:smp_call_function_many_cond+0x4e9/0x1550 kernel/smp.c:855 Code: 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 be c4 0b 00 f3 90 41 0f b6 04 24 <40> 38 c5 7c 08 84 c0 0f 85 24 0e 00 00 8b 43 08 31 ff 83 e0 01 41 RSP: 0018:ffffc90003a2f8e0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9942020 RCX: ffffffff817c4c08 RDX: ffff8880286ad940 RSI: ffffffff817c4be2 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1017328405 R13: 0000000000000001 R14: ffff8880b9942028 R15: ffff8880b983de80 FS: 000055555728c380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc20b14c28 CR3: 000000002369b000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:944 [inline] flush_tlb_mm_range+0x28f/0x320 arch/x86/mm/tlb.c:1030 dup_mmap kernel/fork.c:774 [inline] dup_mm kernel/fork.c:1685 [inline] copy_mm kernel/fork.c:1734 [inline] copy_process+0x4faa/0x97b0 kernel/fork.c:2496 kernel_clone+0xfd/0x930 kernel/fork.c:2901 __do_sys_clone+0xba/0x100 kernel/fork.c:3044 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f6c0d40af63 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007fff3525d5a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6c0d40af63 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 000055555728c650 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000d822 R14: 00007fff3525d6cc R15: 0000000000000003