我目前遇到一个问题，在启动过程中计算机停止启动。这种情况随机发生！它总是卡在同一个地方（下面）。我真的不明白这是什么意思。有人知道我该如何解决这个问题吗？我愿意按照说明向大家提供有关我的问题的更多信息 :)
[ 2.784010] ACPI: Power Button [PWRB]
[ 2.787744] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input2
[ 2.795219] ACPI: Power Button [PWRF]
[ 23.635987] INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 23.641708] 2-...: (2 GPs behind) idle=e14/0/0 softirq=14/14 fqs=0
[ 23.648102] 4-...: (5 GPs behind) idle=ac8/0/0 softirq=7/9 fqs=0
[ 23.654328] 6-...: (5 GPs behind) idle=8b8/0/0 softirq=9/11 fqs=0
[ 23.660641] 7-...: (0 ticks this GP) idle=860/0/0 softirq=18/18 fqs=0
[ 23.667758] (detected by 5, t=21002 jiffies, g=-291, c=-292, q=42)
[ 23.674555] Task dump for CPU 2:
[ 23.678303] swapper/2 R running task 0 0 1 0x00200000
[ 23.685929] ffff88046ec91400 ffff88045cb33ed0 ffffffff82092d10 0000000000000001
[ 23.693942] 0000000000000000 ffffffff81f262b8 0000000000000000 ffff88045cb34000
[ 23.701958] 0000000000000000 0000000000000000 ffff88045cb33ed0 ffffffff810250ff
[ 23.709965] Call Trace:
[ 23.712956] [<ffffffff810250ff>] ? arch_cpu_idle+0xf/0x20
[ 23.719001] [<ffffffff810b6c6a>] ? default_idle_call+0x2a/0x30
[ 23.725489] [<ffffffff810b6f1f>] ? cpu_startup_entry+0x2af/0x310
[ 23.732132] [<ffffffff8103b3df>] ? start_secondary+0xef/0x100
[ 23.738531] Task dump for CPU 4:
[ 23.742307] swapper/4 R running task 0 0 1 0x00200000
[ 23.749988] ffff88046ed11400 ffff88045cb3bed0 ffffffff82092d10 0000000000000001
[ 23.758030] 0000000000000000 ffffffff81f262b8 0000000000000000 ffff88045cb3c000
[ 23.766068] 0000000000000000 0000000000000000 ffff88045cb3bed0 ffffffff810250ff
[ 23.774102] Call Trace:
[ 23.777109] [<ffffffff810250ff>] ? arch_cpu_idle+0xf/0x20
[ 23.783171] [<ffffffff810b6c6a>] ? default_idle_call+0x2a/0x30
[ 23.789681] [<ffffffff810b6f1f>] ? cpu_startup_entry+0x2af/0x310
[ 23.796340] [<ffffffff8103b3df>] ? start_secondary+0xef/0x100
[ 23.802746] Task dump for CPU 6:
[ 23.806522] swapper/6 R running task 0 0 1 0x00200000
[ 23.814167] ffff88046ed91400 ffff88045cb4bed0 ffffffff82092d10 0000000000000001
[ 23.822202] 0000000000000000 ffffffff81f262b8 0000000000000000 ffff88045cb4c000
[ 23.830244] 0000000000000000 0000000000000000 ffff88045cb4bed0 ffffffff810250ff
[ 23.838274] Call Trace:
[ 23.841258] [<ffffffff810250ff>] ? arch_cpu_idle+0xf/0x20
[ 23.847297] [<ffffffff810b6c6a>] ? default_idle_call+0x2a/0x30
[ 23.853769] [<ffffffff810b6f1f>] ? cpu_startup_entry+0x2af/0x310
[ 23.860401] [<ffffffff8103b3df>] ? start_secondary+0xef/0x100
[ 23.866753] Task dump for CPU 7:
[ 23.870480] swapper/7 R running task 0 0 1 0x00200000
[ 23.878090] ffff88046edd1400 ffff88045cb4fed0 ffffffff82092d10 0000000000000001
[ 23.886097] 0000000000000000 ffffffff81f262b8 0000000000000000 ffff88045cb50000
[ 23.894122] 0000000000000000 0000000000000000 ffff88045cb4fed0 ffffffff810250ff
[ 23.902135] Call Trace:
[ 23.905114] [<ffffffff810250ff>] ? arch_cpu_idle+0xf/0x20
[ 23.911148] [<ffffffff810b6c6a>] ? default_idle_call+0x2a/0x30
[ 23.917607] [<ffffffff810b6f1f>] ? cpu_startup_entry+0x2af/0x310
[ 23.924242] [<ffffffff8103b3df>] ? start_secondary+0xef/0x100
[ 23.930598] rcu_preempt kthread starved for 21002 jiffies! g18446744073709551325 c18446744073709551324 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x1
[ 23.944112] rcu_preempt S ffff88045cb13db8 0 7 2 0x00000000
[ 23.951741] ffff88045cb13db8 ffff88046ecceb00 ffff88045ca34c80 ffff88045cb13df0
[ 23.959751] ffff88045cb14000 00000000fffb72e9 ffff88045cb13df0 ffff88046ecceb00
[ 23.967771] 0000000000000000 ffff88045cb13dd0 ffffffff819ca1fc ffff88046ecceb00
[ 23.975791] Call Trace:
[ 23.978770] [<ffffffff819ca1fc>] schedule+0x3c/0x90
[ 23.984298] [<ffffffff819cd537>] schedule_timeout+0x177/0x330
[ 23.990689] [<ffffffff810d15f0>] ? del_timer_sync+0x50/0x50
[ 23.996882] [<ffffffff810ccdd0>] rcu_gp_kthread+0x5e0/0x900
[ 24.003081] [<ffffffff810cc7f0>] ? synchronize_sched_expedited+0xa0/0xa0
[ 24.010415] [<ffffffff81098239>] kthread+0xc9/0xe0
[ 24.015819] [<ffffffff819ce7cf>] ret_from_fork+0x1f/0x40
[ 24.021759] [<ffffffff81098170>] ? kthread_worker_fn+0x170/0x170
答案1
以下问题可能会导致 RCU CPU 停转警告：
- CONFIG_PREEMPT 内核中的 CPU 绑定实时任务，可能会在 RCU 读取端临界区中间抢占低优先级任务。如果不允许该低优先级任务在任何其他 CPU 上运行，则这种情况尤其有害，在这种情况下下一个 RCU 宽限期永远无法完成，最终会导致系统内存耗尽并挂起。
- CONFIG_PREEMPT_RT 内核中运行的 CPU 密集型实时任务的优先级高于 RCU 软中断线程。这将阻止调用 RCU 回调，并且在 CONFIG_PREEMPT_RCU 内核中将进一步阻止完成 RCU 宽限期。无论哪种方式，系统最终都会耗尽内存并挂起。
就您而言，这种情况发生在启动过程的早期。根据您的 MOBO/BIOS，可能存在一个设置来禁用或自动设置某项功能，该功能不会允许高优先级线程阻塞 CPU 并导致重要进程在等待 CPU 周期时停止运行。