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Benjamin Fiset-Deschênes
Asked: 2020-01-30 08:04:55 +0800 CST

kern.log 中的“Page fault failed for pfn[0] = 0x0”是什么意思？

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我最近开始在“kern.log”和 syslog 中打印以下元素。

Jan 29 10:28:19 server kernel: [82515.307047] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.315021] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.322996] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.330971] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.338944] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.346923] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.354905] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.362875] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.370855] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.378837] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.386824] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.394788] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.402766] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.410765] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.418722] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.426707] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.434693] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.442670] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.450634] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.458628] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.466590] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.474561] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.482551] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.490528] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.498500] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.506492] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.514463] Page fault failed for pfn[0] = 0x0
Jan 29 10:28:19 server kernel: [82515.522435] Page fault failed for pfn[0] = 0x0

我不知道它们是什么意思，但它们似乎会持续很长时间，使日志变得非常大，通常最终导致系统无响应。

它可能与坏的RAM有关吗？我已经有一段时间没有更改与 RAM 相关的任何内容，并且系统已经运行了几个月，直到现在。

dmesg

1 个回答

  1. Best Answer

    这段代码来自AMDGPU 驱动程序：

    for (i = 0; i < ttm->num_pages; i++) {
    /* FIXME: The pages cannot be touched outside the notifier_lock */
    pages[i] = hmm_device_entry_to_page(range, range->pfns[i]);
    if (unlikely(!pages[i])) {
        pr_err("Page fault failed for pfn[%lu] = 0x%llx\n",
               i, range->pfns[i]);
        r = -ENOMEM;

        goto out_free_pfns;

    显然，unlikely()函数返回 true 评估pages数组中 i 条目内容的否定，其中包含hmm_device_entry_to_page() “用于解码设备条目值的范围”和“用于获取相应结构页面的设备条目值”的结果。据说这会ENOMEM导致 gpu 出现内存不足 () 错误。基本上，您的 gpu 中存在内存错误，它抱怨内存不足。

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